JPH10141675A - Temperature control device for composite hot-water heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the improvement in comfortable property without receiving any affection due to the difference of heating loads, in the composite heating operation of a floor heating panel and an indoor heating machine. SOLUTION: The objective hot-water temperature of hot-water which flows out of a heat exchanger 12 for heating is determined based on a temperature difference between an objective room temperature set in a remote controller 4, and the detected room temperature of a room temperature thermistor 403, to effect the combustion control of a gas burner 100, while hot-water heated in the heat exchanger 12 for heating by the combustion of the gas burner 100 is supplied by driving a circulation pump 11 simultaneously into the heat exchanger 15 for heating in an indoor machine 2 and a floor heating panel 3, then, a convection fan 200 is operated. When the indoor temperature has exceeded the objective room temperature, the convection fan 200 is stopped while the stopping period of time is determined in accordance with the temperature difference between the objective room temperature and the detecting room temperature so that it is short when the temperature difference is small but long when the difference is bit. The temperature difference is realized in accordance with a heating load and, therefore, the indoor machine 2 is stopped for a time suitable for the reduction of the indoor temperature to the objective indoor temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined hot water heater for heating a room by forming a hot water circulation circuit for circulating hot water heated by one heating source to a floor heating panel and an indoor unit, respectively. Regarding the temperature control device of the system,
In particular, the present invention is effective in a system that does not have a valve for controlling the supply of hot water to an indoor unit in a hot water circulation circuit for supplying heated hot water to an indoor unit.

[0002]

2. Description of the Related Art As a combined hot water heating system, an indoor heater and a floor heater are supplied from a heat exchanger so that hot water heated by a heat exchanger having a burner is supplied to an indoor heater and a floor heating panel, respectively. There is a type in which a hot water circulation circuit branched from a panel is formed. In such a combined hot water heating system, the floor heating panel performs heating by radiating heat from the hot water circulating inside, and the indoor heating unit uses the convection fan provided in the indoor heating unit to apply indoor air to the heating heat exchanger. Thereby, the indoor air is heated by the heat of the hot water passed through the inside of the indoor unit for heating, and is forcibly blown into the room as hot air. In addition, the temperature of the indoor temperature in the combined hot water heating system is controlled by controlling the temperature of the hot water flowing out of the heat exchanger heated by a burner or the like in accordance with the temperature difference between the set temperature set by the remote controller and the room temperature detected by the room temperature sensor. Of the hot water flowing out of the heat exchanger is detected by a thermistor so as to control the combustion amount of the burner so that the hot water temperature becomes the determined target hot water temperature.

On the other hand, when the room temperature rises sufficiently by heating to reach the set temperature, the operation of the convection fan of the room heater is stopped to stop the heating by the room heater, and the heat of the floor heating panel is radiated. A hot-keeping operation for performing heating only by the heating operation is performed. In this hot keeping operation, a stop time and an operation time determined by a substantially constant ratio of the convection fan are set according to a temperature difference between the room temperature and the set temperature, and only during the set stop time, the convection fan is turned off. After the operation stops, the convection fan automatically restarts for the same set operation time. At the end of the reactivation of the convection fan, the room temperature is detected again, the temperature is adjusted according to the temperature difference between the detected room temperature and the set temperature, and if the room temperature is lower than the set temperature. The heating by the indoor unit is performed with the heating capacity according to the temperature difference, and if the room temperature is still higher than the set temperature, the stop time and the operation time of the convection fan are set again, and thereafter, the room temperature and the room temperature are similarly set. The stop and operation of the convection fan are repeated according to the temperature difference from the set temperature.

[0004] The stop time and the operation time of the convection fan set in the conventional hot keeping operation are, for example, 5 minutes if the temperature difference between the set temperature and the room temperature is +0.5 to + 1.0 ° C. Operating time is 3 minutes,
If the temperature difference between the set temperature and the room temperature is + 1.0 ° C. or more, the stop time is set to 8 minutes and the operation time is set to 5 minutes. On the other hand, during the hot keeping operation in which the convection fan of the indoor heater is stopped, the temperature of the hot water heated by the heat exchanger becomes a constant temperature (for example, 47 ° C.) suitable for supplying to the floor heating panel. Then, the combustion amount of the burner is controlled.

[0005]

As described above, in the conventional combined hot water heating system, in the hot keeping operation performed when the room temperature becomes sufficiently higher than the set temperature, the stop time of the convection fan is reduced. Since only the temperature is selected from the two types of 5 minutes or 8 minutes according to the temperature difference between the room temperature and the set temperature, while the convection fan is stopped and the heating by the room heater is stopped. The room temperature greatly decreases, and the room temperature increases greatly after the convection fan restarts, and the temperature change of the room temperature becomes large, and the convection selected according to the temperature difference between the set temperature and the inside temperature of the measure. Since the stop time of the fan is 8 minutes at the maximum, for example, when the outside air temperature is high and the heating load is small, even if the convection fan is idle, the floor heating panel Since the heat radiation is continued, the room temperature does not sufficiently decrease to the set temperature even after the convection fan is stopped, and when the operation of the convection fan is resumed, the room temperature further increases, and this is repeated. Then, there is a problem that the indoor temperature gradually rises and comfort is greatly impaired.

The present invention relates to a combined hot water heating system provided with a hot water circulation circuit for supplying hot water heated by one heating source to an indoor heater and a floor heating panel, and is affected by differences in heating load such as outside air temperature. It is intended to make it difficult to improve comfort.

[0007]

According to the first aspect of the present invention, there is provided a heating heat exchanger including a floor heating panel for heating a room using hot water passing therethrough as a heat source, and a convection fan for circulating room air. An indoor heater that heats the room as a heat source by passing hot water through, and a heating heat exchanger that heats water passing through the interior by heating the heating means, wherein the floor heating panel and the indoor heater are provided. In a combined hot water heating system, which is provided in parallel with the heating heat exchanger and forms a hot water circulation circuit for circulating hot water heated by the heating means to the floor heating panel and the indoor heater by a pump, A room temperature setter for setting the target room temperature of the room, a room temperature sensor for detecting the room temperature,
When the detected room temperature of the room temperature sensor is higher than the target room temperature of the room temperature setting device, a pause time for stopping heating by the indoor heater is determined based on a temperature difference between the target room temperature and the detected room temperature. When the detected room temperature is lower than the target room temperature, heating is performed by the indoor heater, and when the detected room temperature is higher than the target room temperature, An indoor heater control unit that suspends heating by the heater for a suspension time determined by the suspension time determination unit, and forcibly restarts heating by the indoor heater after the suspension time elapses. Means.

According to the first aspect of the present invention,
A hot water circulation circuit is formed in which an indoor heater and a floor heating panel are provided in parallel with the heating heat exchanger, and the hot water heated by the heating heat exchanger by the operation of the heating means is heated by the indoor heating system. It is supplied to the machine and the floor heating panel and circulates. In the floor heating panel, the room is heated by the radiating hot water circulating, and in the indoor heater, the heat of the hot water passing through the heating heat exchanger moves to the indoor air applied to the heating heat exchanger by the operation of the convection fan. , Indoor heating is performed.

While the room temperature detected by the room temperature sensor is lower than the target room temperature of the room temperature setting device, the room heater is operated to heat the room air. When the room temperature rises and the detected room temperature becomes higher than the target room temperature, the pause time is determined in three or more stages according to the temperature difference between the target room temperature and the detected room temperature. Although the operation of the heater is stopped, the heating by the floor heating panel is continued while the indoor heater is stopped. During the suspension time, after the indoor heater is stopped, the indoor heater is forcibly restarted to heat the room, so that the indoor temperature is raised again by the restart of the indoor heater.

The pause time determined by the pause time determining means is determined in accordance with the temperature difference between the target room temperature and the detected room temperature. If the temperature difference is large, the room temperature is reduced while the operation of the room heater is stopped. When the long pause time is determined so as to sufficiently decrease the temperature and the temperature difference is small, the pause time is determined to be short to reduce the decrease in the room temperature during the pause time.

When the outside air temperature is low and the heating load is large, the room temperature rises slowly even when the room heater is activated because the room temperature drops rapidly, and the temperature difference between the target room temperature and the detected room temperature is small. , Appear small. In such a case, the downtime is shortened, so that the decrease in the room temperature during the downtime can be reduced, and the room heater must be restarted before the room temperature drops significantly from the target room temperature. Can be. Conversely, when the outside air temperature is high and the heating load is small,
Since the indoor temperature decreases slowly, when the indoor heater is activated, the indoor temperature rises quickly, and the indoor temperature tends to be excessively higher than the target room temperature, so that the temperature difference between the target room temperature and the detected room temperature appears greatly. In such a case, since the downtime is long, the room temperature can be sufficiently reduced during the downtime, and the operation of the indoor heater is restarted while the room temperature is higher than the target room temperature. Nothing.

As described above, according to the first aspect, when the detected room temperature becomes higher than the target room temperature, an appropriate pause time according to the heating load is set in a plurality of stages according to the temperature difference between the detected room temperature and the target room temperature. Because it is determined, the indoor temperature does not drop because the room temperature becomes too high or the room temperature does not drop significantly while the room heater is stopped, and it is difficult to be affected by the difference in heating load, and it is necessary to provide comfortable combined heating Can be.

According to a second aspect of the present invention, in the first aspect, a heating temperature sensor for detecting a temperature of hot water flowing out of the heating heat exchanger, and the target room temperature when the indoor heater is performing heating. And determining a target hot water temperature of hot water to be heated by the heating heat exchanger based on a temperature difference between the detected room temperature and, when heating by the indoor heater is not performed, the outside air temperature sensor Target hot water temperature determining means for determining the target hot water temperature based on the detected outside air temperature; and the target hot water temperature determined by the target hot water temperature determining means and the hot water temperature detected by the heating temperature sensor. Technical means is provided with heating control means for controlling the heating amount of the heating means.

According to the second aspect, while the room temperature is low and the room temperature detected by the room temperature sensor is lower than the target room temperature by the room temperature setting device, the target hot water temperature of the hot water flowing out of the heating heat exchanger is: It is determined based on the temperature difference between the target room temperature and the detected room temperature, and the heating amount of the heating means is controlled so as to reach the determined hot water temperature. Conversely, the indoor temperature rises,
While the detected room temperature is higher than the target room temperature and the operation of the indoor heater is stopped, the target hot water temperature of the hot water flowing out of the heating heat exchanger is based on the outside air temperature detected by the outside air temperature sensor. Is determined.

Accordingly, when the outside air temperature is low and the heating load is large, the target hot water temperature can be determined to be high in accordance with the outside air temperature.
Conversely, when the outside air temperature is high and the heating load is small, the target hot water temperature can be determined to be low according to the outside air temperature. As a result, when the heating load is large, the warm water heated to a high temperature is supplied to the floor heating panel even when the indoor temperature is once higher than the target room temperature and the heating of the indoor heater is stopped. Therefore, the decrease in the room temperature can be moderated, and the comfortable state can be maintained for a long time. In addition, when the heating load is small, the room temperature temporarily becomes higher than the target room temperature and the heating of the room heater is stopped, and then the temperature of the hot water supplied to the floor heating panel is lowered. The panel prevents the room air from being overheated and the comfortable state is less likely to be impaired.

As described above, according to the second aspect, even when the indoor heater is stopped due to an increase in the indoor temperature, the floor heating panel is supplied with hot water having a temperature corresponding to the heating load at that time. Can be supplied, so that the room temperature does not become too high or the floor surface temperature becomes too low while the indoor heater is stopped.

According to a third aspect of the present invention, in the first or second aspect, the hot water circulation circuit is not provided with a control valve for controlling hot water circulating in the indoor heater, and the hot water circulation circuit is controlled by the indoor heater control means. The technical action is that the stop operation of the indoor heater is to stop the convection fan. Accordingly, in the third aspect, the configuration of the hot water circulation circuit can be simplified because there is no need for a control valve in the hot water circulation circuit, and only the operation of the convection fan of the indoor heater needs to be controlled. it can.

According to a fourth aspect, in the first to third aspects,
The room heater control means performs the restart of the room heater after the elapse of the pause time at least continuously for at least a certain time, and when the heating of the room heater for the certain time ends, the detected room temperature becomes the target room temperature. If higher, the heating by the indoor heater is paused again for the pause time newly determined by the pause time determination means, and if the detected room temperature is lower than the target room temperature, even after the elapse of the certain time period The technical means is to continue the heating by the indoor heater.

According to the fourth aspect of the present invention, the convection fan operates reliably for a predetermined time or more when the indoor heater is restarted, for example, when the control unit is not provided in the hot water circulation circuit to the indoor heater. Even if the heat of the supplied hot water stays inside the indoor heater while the air heater is stopped, the temperature inside the indoor heater can be reduced by operating the convection fan for a certain period of time or longer. During operation, the temperature of the air in the vicinity of the heating heat exchanger can be reliably set to the temperature of the room in which heating is being performed. Therefore, even when the installation position of the room temperature sensor and the like is limited to the inside of the indoor heating device, the room temperature can be correctly detected after the convection fan is restarted, and the combined hot water heating system has a simple configuration. This makes it possible to provide an inexpensive system with good temperature control.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the following embodiments. FIG. 1 shows an embodiment of a hot water heating type air conditioning system according to the combined hot water heating system of the present invention. In FIG. 1, reference numeral 1 denotes an outdoor unit having a heating source and a cooling source and installed outdoors, 2 denotes an indoor unit disposed on a wall above the room, and 3 denotes a floor having a hot water pipe for heat radiation. The indoor unit 2 is connected to the outdoor unit 1 by hot water piping and cooling piping, and the floor heating panel 3 is connected to the outdoor unit 1 by hot water piping. A hot water circuit 10 and a refrigeration cycle 20 are respectively formed by the outdoor unit 1, the indoor unit 2, the floor heating panel 3, and hot water pipes and cooling pipes connecting these.

The outdoor unit 1 is provided with a circulating pump 11, a heating heat exchanger 12, and a pressure tank 13 which are driven at a constant rotation as a configuration of a hot water circuit 10. The heating heat exchanger 12 has a heating source. A gas burner 100 is provided. In addition, a floor warm / hot water supply control mechanism 14 is provided in the hot water pipe toward the floor heating panel 3.

As shown in FIG. 2, the floor heating / hot water supply control mechanism 14 includes a floor heating / hot water circuit 10a directed to the floor heating panel 3.
, A bypass 10b connected in parallel to the floor heating / hot water circuit 10a so as to bypass the thermal valve 14a, and a second thermal valve 14a provided in the bypass 10b.
It comprises a thermal valve 14b and an orifice 14c for limiting the flow rate. Here, each of the thermal valves 14a and 14b controls opening and closing by heat of an electric heater or the like, and it takes time to open and close. However, when the circulation of the hot water is stopped, the hot water circulating circuit is surely operated by a large operating force. Can be closed. It should be noted that a solenoid valve or a motor valve may be used instead of each of the thermal valves 14a and 14b.

On the other hand, the configuration of the refrigeration cycle 20 is as follows.
A compressor 21, a condenser 22, a strainer 23, and a capillary tube 24, which are driven by an inverter-controlled motor to compress a refrigerant gas as a refrigerant, are provided.

The indoor unit 2 is provided with a heating heat exchanger 15 as a configuration of the hot water circuit 10 and a cooling heat exchanger 26 as a configuration of the refrigeration cycle 20.
Convection fan 2 for circulating indoor air for 5 and 26
00 is provided, and the indoor air is supplied to the heat exchanger 26 for cooling.
→ Pass through the heating heat exchanger 15 in order, and send it out to the room again.

In the outdoor unit 1, the indoor unit 2 and the floor heating panel 3, the hot water circuit 10 has a discharge side of a circulation pump 11 connected to an inflow side of a heating heat exchanger 12, and an outflow side of the heating heat exchanger 12. The hot water pipe branches into two, and one of the hot water pipes is connected to the inflow side of the heating heat exchanger 15 of the indoor unit 2.
The other of the branched hot water pipes has a floor warm / hot water supply control mechanism 1.
4 is connected to the inflow side of the floor heating panel 3.
The hot water pipe on the outflow side of the heating heat exchanger 15 and the hot water pipe on the outflow side of the floor heating panel 3 join to form the pressure tank 1.
3 is connected to the suction side of the circulation pump 11.

In the hot water circuit 10 having the above structure, the circulation pump 11 operates to operate the circulation pump 11 → heating heat exchanger 12 → heating heat exchanger 15 → pressure tank 13 → circulation pump 11. Or circulation pump 11 → heat exchanger 12 for heating → floor warm / hot water supply control mechanism 1
4 → floor heating panel 3 → pressure tank 13 → circulation circuit 11 circulates hot water heated by gas burner 100 in a circulation circuit.

On the other hand, in the refrigeration cycle 20, the refrigerant is supplied to the refrigerant compressor 21 → condenser 22 → strainer 23 → capillary tube 24 → cooling heat exchanger 26 → refrigerant compressor 21
During the circulation, the refrigerant changes the state from the gas phase to the liquid phase in the condenser 22 to release heat, and the refrigerant changes state from the liquid phase (mist) to the gas phase in the cooling heat exchanger 26. To absorb heat and cool the room air.

Gas burner 100 which is a heating source of outdoor unit 1
Is for supplying combustion air by a combustion fan 101, and a fuel supply passage 102 for supplying a fuel gas to a gas burner 100 is provided with two gas solenoid valves 103 and 104 and a gas proportional valve 105. , Gas burner 10
An ignition electrode 106 and a frame rod 107 are provided in the vicinity of the flame outlet 0.

The control device 400 controls various operations by a microcomputer in accordance with the remote controller 4 operated by the user. The control device 400 is provided separately for the outdoor unit 1 and the indoor unit 2, and mutually controls various operations. Transmit the signal.

The control device 400 includes a high-temperature water thermistor 401 for detecting the temperature of the hot water on the outlet side of the hot water of the heating heat exchanger 12 of the outdoor unit 1 and a heating heat exchange for the indoor unit 2 to perform various controls. The indoor hot water thermistor 402 for detecting the hot water temperature on the hot water outflow side of the unit 15, the room temperature thermistor 403 for detecting the indoor temperature in the indoor unit 2, and the outdoor air thermistor 404 for detecting the outdoor outdoor temperature where the outdoor unit 1 is installed. It has.

In the hot water heating type air-conditioning system having the above-described configuration, the controller 400 controls the heating operation such as sole floor operation using only the floor heating panel 3, duet heating operation using the floor heating panel 3 and the indoor unit 2, and In the operation involving the operation of the refrigeration cycle 20, the dry operation only by the indoor unit 2, the duet dry operation by the floor heating panel 3 and the indoor unit 2, and the cooling operation by the indoor unit 2 are controlled. In the cooling operation and each dry operation, the rotation speed of the compressor 21 is controlled as inverter control for driving the compressor 21. Hereinafter, the floor alone operation and the duet heating operation as the heating operation will be described.

[Floor independent operation] In the floor independent operation, a heating operation is performed only by the floor heating panel 3. In the sole floor operation, the circulation pump 11 is driven at a constant rotation, and the heating heat exchanger 12 is controlled in accordance with the floor heating level Hn set in seven steps by the remote controller 4 and the outside air temperature Ta detected by the outside air temperature thermistor 404. Hot water temperature T of hot water heated by
O is determined, and the combustion fan 101 and the gas proportional valve 105 are controlled to adjust the combustion amount of the gas burner 100 so as to reach the determined target hot water temperature TO.

Each floor heating level set by the remote controller 4 is, for example, such that the floor surface temperature is 26 ° C. in the first speed having the lowest heating capacity, and the floor temperature is 3 ° in the intermediate fourth speed.
At the highest 7th speed, the floor temperature is 36 ° C so that it becomes 1 ° C.
In each floor heating level, the lower the outside air temperature Ta is, the higher the temperature is, and the higher the outside air temperature Ta is, the lower the target hot water temperature TO is determined according to the outside air temperature Ta. In the single floor operation, when the operation is started, the floor heating hot dash operation is performed according to the ON operation of the floor heating operation of the remote controller 4.

Hereinafter, the operation of the floor alone operation will be described with reference to FIG. When there is an instruction to start operation of the sole floor operation by the remote controller 4, the floor heating hot dash operation is performed first. In the floor heating hot dash operation, first, the convection fan 200 of the indoor unit 2 is driven by a breeze for a predetermined time (several tens of seconds) (step 101), thereby causing convection of the indoor air. After that, the room temperature thermistor 40 provided in the indoor unit 2
3, the indoor temperature Tr is detected (step 102).

Based on this detection, the floor temperature is estimated, and based on the temperature, each thermal valve 14 of the floor warm / hot water supply control mechanism 14 is estimated.
The floor heating hot dash time tp (20 minutes to 3 hours) for continuously opening both a and 14b is calculated (step 1).
03). The floor heating hot dash time tp is calculated to be short when the detected room temperature Tr is high, and to be long when the detected room temperature Tr is low.

In the floor heating hot dash operation, the respective heat operated valves 14a and 14b are opened to start driving the circulation pump 11 and start burning the gas burner 100. During the floor heating hot dash time tp, the high temperature water thermistor 40 is used.
The combustion fan 101 and the gas proportional valve 105 are controlled so that the temperature detected by 1 becomes 80 ° C. (step 104). As a result, the gas burner 100
The warm water heated to 0 ° C. is continuously supplied with the floor warm / hot water supply control mechanism 1 during the floor heating hot dash time tp immediately after the start of operation.
Since the floor heating panel 3 radiates heat through the floor heating hot water circuit 10a and the bypass 10b, sufficient floor heating capacity can be secured at the beginning of heating, and the rise of the room temperature is improved.

After the floor heating hot dash time tp has elapsed (YES in step 105), the second thermal valve 1
4b is closed and only the first thermal valve 14a is opened (step 106), and hot water is supplied only from the floor heating hot water circuit 10a to the floor heating panel 3 to limit the amount of passage through the bypass 10b. Thereafter, the floor heating level Hn and the outside air temperature thermistor 4 set out of the seven levels by the remote controller 4 are set.
Based on the outside air temperature Ta detected by the temperature control unit 04, the floor surface temperature at each floor heating level is set as described above,
The target hot water temperature TO is determined according to the outside air temperature Ta, the combustion amount of the gas burner 100 is controlled according to the determined target hot water temperature TO, and the hot water temperature is adjusted as the control of the heating capacity (step 107). .

As described above, in the floor alone operation, after the floor heating hot dash operation is performed, the target hot water temperature TO corresponding to the floor heating level Hn is set based on the outside air temperature Ta, so that comfortable heating is performed. It can be performed. In addition,
During the floor alone operation, the hot water heated by the heating heat exchanger 12 also circulates through the heating heat exchanger 15 of the indoor unit 2,
In the sole floor operation, the operation of the convection fan 200 is stopped, and the heat of the hot water passing through the inside of the heating heat exchanger 15 is hardly released to the room. Can hardly be obtained.

[Duet heating operation (combined heating operation)]
The duet heating operation is for heating the room by the indoor unit 2 and the floor heating panel 3, but is mainly for increasing the room temperature by the indoor unit 2 and the floor heating panel 3.
Will act as an aid to the indoor unit 2. Therefore, the floor heating level Hn set by the remote controller 4 used for the control in the above-described floor alone operation is not used in the duet heating operation and has no relation to the control of the heating capacity.

In the duet heating operation, the floor heating panel 3
When the floor heating hot dash operation in the case of the above-described floor alone operation is performed, the flow rate of the hot water supplied to the heating heat exchanger 15 effective for raising the room temperature decreases, and the rise of the room temperature is delayed. Therefore, the floor warm / hot water supply control mechanism 13 opens only the second thermal valve 14b and closes the first thermal valve 14a in the floor warm / hot water supply control mechanism 13 until a predetermined time elapses from the start of operation. Limit hot water flow. Thereafter, the temperature control operation is performed based on the set room temperature Tset of the remote controller 4 and the detected room temperature Tr detected by the room temperature thermistor 403.

In the temperature control operation, while the detected room temperature Tr detected by the room temperature thermistor 403 is lower than the target room temperature Tset by the remote controller 4, the indoor unit 2 and the floor heating panel 3
Heating operation, and the indoor temperature Tr and the set temperature Tset
The target hot water temperature TO of the hot water to be heated by the heating heat exchanger 12 is determined according to the temperature difference between the target hot water temperature TO and the determined target hot water temperature TO.
Accordingly, the amount of combustion of the gas burner 100 is controlled to adjust the temperature of the hot water as the control of the heating capacity. During this time, the convection fan 200 is driven to circulate the indoor air.

On the other hand, when the detected room temperature Tr becomes higher than the target room temperature Tset, a hot keeping operation is performed. The hot keeping operation includes the driving of the circulation pump 11 and the gas burner 100.
Only the operation of the convection fan 200 is stopped while continuing the combustion of, and only the heating by the floor heating panel 3 is continued. At this time, the hot water also circulates through the heating heat exchanger 15 of the indoor unit 2, but the heating heat exchanger 15 is
Since the structure is such that the heat of the warm water passing through the inside is released into the room by the operation of 0, the heating effect by the heating heat exchanger 15 is hardly obtained.

In this hot keeping operation, the heating operation by the indoor unit 2 is stopped and heating is performed only by the floor heating panel 3, and the heating capacity is reduced. Decrease. However, the speed at which the indoor temperature decreases while the indoor unit 2 is at rest is not uniform,
It differs depending on the heating load such as a difference in the outside air temperature Ta. When the heating load is large, the indoor temperature tends to decrease while the indoor unit 2 is at rest, and conversely, when the heating load is small, the indoor unit 2 Room temperature does not easily drop during pauses. When this is considered during the heating of the indoor unit 2, even if the heating is performed in the same manner by the indoor unit 2, when the heating load is large, the degree of the increase in the indoor temperature becomes small, and conversely. When the heating load is small, the degree of increase in the room temperature increases.

Therefore, in the present invention, the hot keeping operation time ts is determined according to how much the detected room temperature Tr is higher than the target room temperature Tset, and the indoor unit 2 has a large heating load.
When the indoor temperature is apt to decrease during the suspension of the operation, the hot keeping operation time ts is shortened. Conversely, when the heating load is small and the indoor temperature is less likely to decrease during the suspension of the indoor unit 2, the hot keeping operation time ts is reduced. Decide long. Table 1 shows an example of the relationship between the temperature difference between the detected room temperature Tr and the target room temperature Tset and the determined hot keeping operation time ts in this embodiment.

[0045]

[Table 1]

In this embodiment, each of the hot keeping operation times ts shown in Table 1 is calculated based on the calculated detected room temperature Tr.
The data of the hot keeping operation time ts set in advance corresponding to the temperature difference between the target temperature and the target room temperature Tset is stored in the memory of the microcomputer, and when the temperature difference is given, the hot keeping operation time corresponding to the temperature difference is given. ts is determined.

During the hot keeping operation, the detected room temperature Tr is sufficiently raised with respect to the target room temperature Tset, and a large amount of heating of the room is unnecessary. Therefore, during the hot keeping operation in which the operation of the convection fan 200 is stopped, the target hot water temperature TO of the hot water heated by the heating heat exchanger 12 is set to the set temperature Tset of the remote controller 4 and the room temperature of the room temperature thermistor 403. The outside air temperature T detected by the outside air temperature thermistor 404 regardless of Tr
Determined based on a. In the present embodiment, the data of the target hot water temperature TO set in advance corresponding to the outside air temperature Ta is stored in the memory of the microcomputer, and when the outside air temperature Ta detected by the outside air temperature thermistor 404 is given, the temperature is calculated. Is determined. Table 2 shows an example of the target hot water temperature TO determined in the hot keeping operation.

[0048]

[Table 2]

As shown in Table 2, in the case of the hot keeping operation in which the detected room temperature Tr is higher than the target room temperature Tset,
For example, when the outside air temperature Ta is 0 ° C. or lower, the target hot water temperature TO is determined to be 70 ° C., and when the outdoor air temperature Ta is 20 ° C. or higher, the target hot water temperature TO is determined to be 40 ° C. Since hot water of a certain temperature is not supplied to the floor heating panel 3,
A heating capacity suitable for the heating load at each time is obtained.

In the hot keeping operation, since the operation of the convection fan 200 is stopped, the circulation of the indoor air is stopped and the heat of the hot water circulating through the heating heat exchanger 15 in the indoor unit 2 causes the indoor unit to lose heat. The room temperature cannot be correctly detected by the room temperature thermistor 403 provided in the device 2. For this reason, in the present embodiment, after the hot keeping operation is completed, the convection fan 200 is forcibly operated for a certain period of time (for example, three minutes) to radiate heat in the indoor unit 2 and detect a correct indoor temperature. Therefore, even if the hot keeping operation is completed, the indoor temperature is not detected until a certain time (3 minutes) elapses, and the determination of the new hot keeping operation time ts is fixed. At the end of the time (3 minutes), the detected room temperature Tr is set to the target room temperature Tset.
If the temperature is still higher, the operation of the convection fan 200 is stopped again for a new hot keeping operation time ts determined according to the outside air temperature Ta after the operation of the convection fan 200 for a fixed time (3 minutes).

Hereinafter, the operation in the duet heating operation will be described with reference to FIG. When the start of the duet heating operation is instructed by the remote controller 4, the first heat valve 14a provided in the floor heating / hot water circuit 10a is closed and provided in the bypass 10b in order to quickly raise the room temperature. Only the second thermal valve 14b is opened (Step 111), the circulation pump 11 is operated, and the combustion of the gas burner 100 is started (Step 112), and a predetermined time (for example, 20 to 30 minutes) after the start of the duet heating operation. Until elapses (NO in step 113), priority is given to the supply of hot water to the heating heat exchanger 15.

As described above, the supply amount of the hot water supplied to the floor heating panel 3 (which is not very effective in raising the room temperature) is reduced, and the supply amount of the hot water supplied to the indoor unit 2 is reduced accordingly. Can be increased, the amount of heat radiation of the heating heat exchanger 16 can be increased, and the rise of room temperature can be accelerated in the early stage of operation. In addition, even after the predetermined ignition control of the gas burner 100 is performed and the driving of the circulation pump 11 is started, until the detected temperature of the indoor hot water thermistor 402 becomes sufficiently high (for example, 30 ° C.), the blowing of the cool air is prevented. Then, after the temperature of the convection fan 200 has risen sufficiently without driving the convection fan 200, the convection fan 200 starts blowing air.

When a predetermined time has elapsed after the start of operation (YES in step 113), the second thermal valve 14b is closed and the first thermal valve 14a is opened (step 114), and thereafter, temperature control is performed. Note that, even if the detected room temperature Tr becomes higher than the target room temperature Tset before the predetermined time elapses after the start of operation, the second thermal valve 14b is closed and the first thermal valve 14a is opened, A hot keep operation of step 117 described later is performed.

In the subsequent temperature control, based on the temperature difference between the target room temperature Tset by the remote controller 4 and the room temperature Tr detected by the room temperature thermistor 403, the target hot water temperature TO of the hot water heated by the heating heat exchanger 12 and flowing out is determined. The determination is made (step 115), and this is repeated as long as the detected room temperature Tr detected by the room temperature thermistor 403 is lower than the target room temperature Tset set by the remote controller 4 (NO in step 116).

During the temperature control, if the detected room temperature Tr detected by the room temperature thermistor 403 becomes higher than the target room temperature Tset set by the remote controller 4 (YE in step 116).
S), the heating operation by the indoor unit 2 is stopped, and a hot keeping operation for heating only by the floor heating panel 3 is started (step 117).

In the hot keeping operation, first, the hot keeping operation time ts is set to the target room temperature Tset as shown in Table 1 above.
And the detected room temperature Tr. Further, when the hot keeping operation is performed, the target hot water temperature TO of the hot water heated by the heating heat exchanger 12 of the hot water circuit 10 is set based on the outside air temperature Ta detected by the outside air temperature thermistor 404 as described above. Determined as shown in Table 2.

After the operation of the convection fan 200 stops for the determined hot keeping operation time ts, the convection fan 200 operates again. At this time, the convection fan 200
Is forcibly activated for a fixed time (3 minutes) (Step 1)
18), and upon completion of the process, the process proceeds to step 116.
When the room temperature is detected again and the detected room temperature Tr is lower than the target room temperature Tset, the target hot water temperature TO is determined according to the temperature difference between the detected room temperature Tr and the target room temperature Tset, and the detected room temperature Tr is set to the target room temperature. If it is higher than room temperature Tset,
The hot keeping operation is performed for the hot keeping operation time ts determined as described above. Note that, during a certain time (3 minutes) after the hot keeping operation, the target hot water temperature TO remains determined based on the outside air temperature Ta even while the convection fan 200 is operating.

The combustion amount of the gas burner 100 is adjusted based on the detected temperature of the high-temperature water thermistor 401 by controlling the combustion fan 101 and the gas proportional valve 105 so as to obtain the respective target hot water temperatures TO. Further, after the operation is completed, the operation of the circulation pump 11 is stopped two minutes after the combustion of the gas burner 100 is stopped, so that the heating operation can be smoothly stopped using the residual heat.

As described above, according to the present invention, in the duet heating operation, in the hot keeping operation performed when the room temperature becomes higher than the target room temperature, the hot keeping operation time is set to the temperature difference between the target room temperature and the detected room temperature. The appropriate length of time can be determined for each heating load before the room temperature, which is higher than the target room temperature, falls to the target room temperature, so the room temperature can be determined during the hot-keeping operation. Therefore, a comfortable heating operation can be performed without causing a problem such as the room temperature gradually becoming too high during repeated hot keeping operations.

In the above embodiment, the convection fan is stopped as the hot keeping operation. However, the shutoff valve may be provided in the hot water circuit 10 to the indoor unit 2 to stop the supply of the hot water. . In this case, the operation of the convection fan may be continued at a low rotation speed. In the above embodiment, the gas burner is used as the heating source, but a hot water heating system using another heating source such as an oil burner or electric heating may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hot water air conditioner system showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a floor warm / hot water supply control mechanism in the warm water air-conditioning system according to the embodiment of the present invention.

FIG. 3 is a flowchart for explaining a control operation of the floor sole operation in the embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of the duet heating operation in the embodiment of the present invention.

[Explanation of symbols]

2 indoor unit (indoor heating unit) 3 floor heating panel 4 remote control (room temperature setting device) 10 hot water circuit (hot water circulation circuit) 11 circulation pump 12 heating heat exchanger 15 heating heat exchanger 100 gas burner (heating means) 200 convection Fan 403 Room temperature thermistor (room temperature sensor) 400 Controller (Temperature controller of combined hot water heating system, indoor heater control means, pause time determining means, target hot water temperature determining means, heating control means) 401 High temperature water thermistor (heating temperature sensor) ) 404 Outside air temperature thermistor (outside air temperature sensor)

Claims (4)

[Claims] 1. A room for heating a room as a heat source by passing hot water through a floor heating panel that heats the room using hot water passing through the inside as a heat source and a heat exchanger for heating provided with a convection fan that circulates room air. A heating device, comprising a heating heat exchanger for heating water passing therethrough by heating the heating means, the floor heating panel and the indoor heating device are provided in parallel with the heating heat exchanger. In a combined hot water heating system that forms a hot water circulation circuit that circulates hot water heated by the heating means to the floor heating panel and the indoor heater by a pump, a room temperature setter for setting a target indoor room temperature, A room temperature sensor for detecting an indoor temperature, and for stopping heating by the indoor heater when the detected room temperature of the room temperature sensor is higher than the target room temperature of the room temperature setting device. A pause time determining means for determining a pause time in three or more stages based on a temperature difference between the target room temperature and the detected room temperature; and when the detected room temperature is lower than the target room temperature, the room heating is performed. When the detected room temperature is higher than the target room temperature, the heating by the room heater is suspended for the suspension time determined by the suspension time determination means, and after the suspension time has elapsed, the room heating is performed. And an indoor heater control means for forcibly restarting heating by the heater. 2. A heating temperature sensor for detecting a temperature of hot water flowing out of the heating heat exchanger, and a temperature difference between the target room temperature and the detected room temperature when heating is performed by the indoor heater. Determines the target hot water temperature of the hot water to be heated by the heating heat exchanger, based on the outside air temperature detected by the outside air temperature sensor when heating by the indoor heater is not performed. Target hot water temperature determining means for determining the target hot water temperature; and controlling a heating amount of the heating means based on the target hot water temperature determined by the target hot water temperature determining means and a detected hot water temperature of the heating temperature sensor. The temperature control device for a combined hot water heating system according to claim 1, further comprising heating control means. 3. The hot water circulation circuit is not provided with a control valve for controlling hot water circulating in the indoor heater.
3. The temperature control device for a combined hot water heating system according to claim 1, wherein the stop operation of the room heater by the room heater control unit is a stop of the convection fan. 4. 4. The indoor heater control means performs reactivation of the indoor heater after the elapse of the pause time for at least a fixed time continuously, and when the heating of the indoor heater is completed for the fixed time, the detection is performed. When the room temperature is higher than the target room temperature, the heating by the indoor heater is paused again for a pause time newly determined by the pause time determination means, and when the detected room temperature is lower than the target room temperature, The temperature control device for a combined hot water heating system according to any one of claims 1 to 3, wherein heating by the indoor heater is continued even after a predetermined time has elapsed.