JPH102565A - Temperature control method of hot-water room heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the reduction of supplying amount of heat under the supplying condition of the minimum amount of hot-water while securing the minimum hot-water supplying amount of a thermal valve by a method wherein the rate of opening period of time of the thermal valve, controlling the supplying amount of hot-water, to the set period of time of the same is adjusted by changing the set period of time. SOLUTION: The extracting interval or the set interval of a room temperature is set so as to be the shortest interval T0 and the opening period of time of a thermal valve 5 is set so as to be the shortest opening period of time (t0 ) as initial values upon starting room heating operation. According to this method, a present room temperature, detected by a room temperature sensor 7 at every times of elapse of the set period of time after starting the operation, is extracted and read into the controller 6 of respective rooms while the room temperature is compared with the set temperature and a difference between them is outputted to a control unit 8. In the control unit 8, the opening period of time of a thermal valve 5 is set based on the difference whereby a rate to the set interval T0 is regulated and the supplying amount of hot-water to a radiator 4 from the thermal valve 5 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control method for a hot water heating apparatus, and more particularly to a temperature control method for a hot water heating apparatus that prevents overheating when the load is small.

[0002]

2. Description of the Related Art Conventionally, a hot water heater having a structure shown in FIG. 2 is known. In this figure, a hot water heating device indicated by reference numeral 1 is provided with a heat source unit 2 and a radiator 4 which is installed in each room 3 and is supplied with hot water generated in the heat source unit 2 to heat indoor air. A thermal valve 5 connected to each of the radiators 4 to control a supply amount of the hot water supplied to each of the radiators 4; A controller 6 for setting various conditions, and connected to these controllers 6,
A room temperature sensor 7 for detecting a room temperature and each of the controllers 6
And a control unit 8 for controlling the operation of the heat source unit 2 and the heat valve 5 based on the control signal output from the control unit.

The heat source unit 2 includes a housing 9 and
A heater 10 installed in the housing 9, a hot water supply pipe 11 for supplying the hot water generated in the heater 10 to each of the thermal valves 5, and a hot water that has completed heat exchange in each of the radiators 4. Hot water return pipe 1 circulated to heater 10
2, an expansion container 13 provided in the middle of the hot water return pipe 12 for absorbing thermal expansion of the hot water and separating gas mixed in the hot water;
In the middle of Step 2, a hot water pump 14 is provided between the expansion vessel 13 and the heater 10 and circulates the hot water.

[0004] As an example of temperature control during the indoor heating operation of the hot water heating apparatus 1 configured as described above, a set temperature (H) set by the controller 6 is used.
s) and the detected room temperature (Hx) is obtained, and the control unit 8 performs feedback control of the combustion of the heater 10 so that the temperature difference becomes zero, as shown by a curve A in FIG. As described above, the room temperature Hx is set to the set temperature Hs.
It has been done to approach.

In such a temperature control, the set temperature Hs and the detected room temperature Hx are continuously compared, and the combustion control of the heater 10 is continuously performed based on the comparison results. Since it is necessary, there is a problem that the control is complicated.

In addition, since a plurality of radiators 4 are provided in series and combustion control of the heater 10 must be performed so as to satisfy all the requirements from each of the radiators 4, the control is further complicated. It has become something.

Therefore, conventionally, the hot water supply temperature is kept constant by keeping the combustion state of the heater 10 constant, and the room temperature Hx is extracted every set time (T), and the room temperature Hx and the set temperature Hs are set. The ratio of the opening time (t) of the thermal valve 5 to the set time (T) is adjusted based on the difference between the temperature and the amount of hot water supplied to the radiator 4, that is, the amount of supplied heat. The room temperature Hx of the room 3 is adjusted.

That is, when the difference between the room temperature Hx and the set temperature Hs is small, the open time t of the thermal valve 5 is shortened as shown by the symbol to in FIG. The supply amount is reduced, and the room temperature Hx and the set temperature Hs
In the case where the difference is large, as shown by a symbol tn in FIG. 4, the open time of the thermal valve 5 is lengthened to increase the supply amount of the hot water within the set time T, thereby increasing Temperature adjustment.

According to such a temperature control method, the adjustment of the capacity of the heater 10 is almost unnecessary, and the adjustment of the amount of heat supplied to the radiator 4 can be performed only by opening and closing the thermal valve 5. There is an advantage that it is simplified.

[0010]

However, even such a conventional temperature control method has the following problems to be improved.

The above-described thermal valve 5 performs an opening / closing operation using a volume change due to heating and cooling of the working fluid.
There is a response delay in the opening and closing operation, and the response greatly changes depending on the ambient temperature where the device is installed.

More specifically, it is assumed that a control signal has been sent to the thermal valve 5 as shown in FIG. Here, FIG.
As shown in (b), when the ambient temperature of the thermal valve 5 is 2
When the temperature is 0 ° C., when an ON signal is sent to the thermal valve 5, the working fluid of the thermal valve 5 is heated, reaches a fully opened state after a predetermined time ta, and when an OFF signal is transmitted. The working fluid is completely released after a predetermined time tb after the heat is released from the working fluid. Also, as shown in FIG. 6C, when the ambient temperature of the thermal valve 5 is, for example, 0 ° C., an ON signal is sent to the thermal valve 5 until the thermal valve 5 reaches the fully opened state. Is longer, and the time tb from when the OFF signal is sent to the fully closed state is shorter.

Therefore, the fully open time of the thermal valve 5 changes depending on the ambient temperature, and the open time t (to in FIG. 6) of the thermal valve 5 set by the control signal is:
The maximum value of the response delay during the opening operation of the thermal valve 5 (see FIG. 6)
If it is set shorter than ta) in (c), a phenomenon occurs in which the thermal valve 5 does not open depending on the ambient temperature. Therefore, in order to ensure hot water supply during operation,
The minimum opening time to of the thermal valve 5 is set to be longer than the maximum value ta of the response delay during the opening operation of the thermal valve 5.

Further, the amount of heat supplied to the radiator 4 is equal to the room temperature H.
It is determined by the ratio between the set time T, which is the extraction interval of x, and the open time t of the thermal valve 5, but since the set time T is constant, the minimum amount of heat supplied from the thermal valve 5 is It is almost uniquely determined.

The thermal valve 5 having such characteristics
When the above-described temperature control is performed by using the above-described method, a control signal for setting the minimum amount of hot water to be supplied to the thermal valve 5 when the room temperature Hx is high and the load is small, etc. Even if the valve 5 is set to the minimum supply heat amount, the supplied heat amount becomes excessive depending on the set temperature Hs, and the room temperature Hx is equal to or higher than the set temperature Hs as shown by a curve B in FIG. It is assumed that it will rise and be maintained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and it is possible to secure a minimum amount of hot water supplied by a heat valve that controls the amount of hot water supplied, and to supply heat in the minimum amount of hot water supply. It is an object of the present invention to provide a temperature control method for a hot-water heating device capable of further reducing the temperature.

[0017]

According to a first aspect of the present invention, there is provided a temperature control method for a hot water heating apparatus, in which a hot water generated by a heat source device is installed in a room to solve the above-mentioned problems. While supplying to the radiator through the thermal valve,
By adjusting the ratio of the opening time of the thermal valve to the set time based on the difference between the set temperature and the room temperature extracted for each set time, the amount of hot water supplied to the radiator per hour is adjusted. And controlling the temperature of the room by controlling the temperature of the room, wherein the ratio between the opening time of the thermal valve and the set time is adjusted by changing the set time. It is characterized by doing.

According to a second aspect of the present invention, there is provided a temperature control method for a hot water heating apparatus, wherein hot water generated by a heat source device is supplied to a radiator installed in a room via a thermal valve. By adjusting the ratio of the opening time of the thermal valve to the set time based on the difference between the set temperature and the room temperature extracted for each set time, the amount of hot water supplied to the radiator per hour is adjusted. A method of controlling the hot water heating apparatus so as to adjust the temperature of the room, while adjusting the ratio between the two by changing the open time of the thermal valve with the set time constant. The opening time is set to a minimum value, and when the number of times of setting to the minimum value reaches a predetermined number, the setting time is extended.

Further, according to a third aspect of the present invention, in the temperature control method for a hot water heating apparatus according to the second aspect, the set time is set to a maximum value, and the set number of times to the maximum value is set to a predetermined number. , The setting time is shortened.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. In the following description, the same parts as those of the related art are denoted by the same reference numerals, and the description will be simplified.

The temperature control method for the hot water heating apparatus 1 according to the present embodiment is to supply hot water generated by the heat source unit 2 to a radiator 4 installed in a room via a heat valve 5 and to set a set temperature. By adjusting the ratio of the open time t of the thermal valve 5 to the set time T on the basis of the difference between Hs and the room temperature Hx extracted for each set time T, the time per hour to the radiator 4 is adjusted. When adjusting the supply amount of hot water to adjust the temperature Hx in the room, the ratio between the open time t of the thermal valve 5 and the set time T is adjusted by changing the set time T. It was done.

More specifically, when the controller 6 installed in each room 3 is operated to start the heating operation, the controller 6 sets the room temperature of each room 3 and the room temperature sensor 7 sets the room temperature. Hx is continuously detected.

Then, as an initial value at the start of operation, the set interval T, which is the extraction interval of the room temperature Hx, is set to the shortest interval To, and the open time t of the thermal valve 5 is set to the shortest open time. Set to to.

Thus, every time the set time T elapses after the start of operation, the detected current room temperature Hx is extracted and taken into the controller 6, and the room temperature Hx is compared with the set temperature Hs. The difference is sent to the control unit 8, and the control unit 8 sets the opening time t of the thermal valve 5 based on the difference, whereby the ratio with the set time To is adjusted.
The amount of hot water supplied from the thermal valve 5 to the radiator 4 is adjusted.

As a result, as shown by the curve C in FIG. 5, the room temperature Hx is increased. When the room temperature Hx exceeds the set temperature Hs, the open time t is changed to the shortest open time to. If the amount of hot water supplied in this state is an excessive supply state, the room temperature Hx is maintained at or above the set temperature Hs. In the present embodiment, however, the control signal based on the overheating information from the control unit 8 is used. As shown in FIG. 1A, the set time T is extended to the set time Tp, and if it is determined that the overheating state is still obtained during the next room temperature extraction, the set time T is set. T is changed to a longer set time Tq, and this operation is sequentially repeated, so that the hot water supply interval is widened and the room temperature Hx is lowered to the set temperature Hs or lower.

After the room temperature Hx is lowered to the set temperature Hs or lower in this way, the set time T is sequentially changed to be shorter in order to raise the room temperature Hx, so that the room temperature Hx is reduced to the set temperature Hs. Approached.

Therefore, in the present embodiment, while the minimum amount of hot water supplied to the thermal valve 5 is secured, the excessive supply of hot water is suppressed, and the room temperature Hx is raised and maintained at the set temperature Hs or higher. Is prevented.

Next, a second embodiment of the present invention will be described. The temperature control method in the hot water heating apparatus 1 of the present embodiment is the same control as in the above embodiment until the room temperature Hx exceeds the set temperature Hs, and is characterized in the processing after the temperature exceeds the set temperature Hs.

That is, when the room temperature Hx exceeds the set temperature Hs, the opening time t of the thermal valve 5 is set to the shortest opening time to, but the number of times set to the minimum opening time to is counted. As shown in FIG. 1B, when the set number reaches a predetermined number (three times in the figure), the set time To is forcibly set to the long set time Tp, and the overheating state continues. In this case, a longer set time Tq
, And the hot water supply interval is extended.

By such a process, similarly to the above-described embodiment, oversupply of hot water is suppressed in a state where the minimum hot water supply amount is secured, and the room temperature Hx is temporarily reduced as shown by a curve D in FIG. Although the temperature is raised to the set temperature Hs or more, the temperature is gradually lowered to the set temperature Hs or less, and the number of times set to the minimum opening time to of the thermal valve 5 is confirmed a plurality of times. Since T is changed, malfunction is suppressed.

The above-described embodiments are merely examples, and various changes can be made based on the type of hot water heater to be applied, design requirements, and the like.

For example, when the room temperature Hx is lowered to the set temperature Hs or lower and then raised to the set temperature Hs again, as in the other embodiments,
It is also possible to increase the room temperature Hx by counting the number of times the set time T is set to the maximum and changing the set time T to a shorter one when the number reaches a predetermined number. is there.

[0033]

As described above, according to the first aspect of the present invention,
According to the temperature control method of the hot water heating apparatus according to the above, it is possible to suppress the oversupply of the hot water in a state in which the minimum supply amount of the hot water of the heat valve is secured, thereby increasing and maintaining the room temperature above the set temperature. Can be reliably prevented from being performed.

According to the temperature control method for a hot water heating apparatus according to the second aspect of the present invention, in addition to the operation and effect achieved in the first aspect, a plurality of settings for the minimum opening time of the thermal valve are provided. Since the set interval is changed after the confirmation, the occurrence of the overheating state can be reliably detected and the malfunction can be prevented.

Further, according to the temperature control method of the hot water heating apparatus according to the third aspect of the present invention, when the room temperature which has once dropped is raised again to the set temperature, the setting of the maximum set interval of the thermal valve is performed. Since the set interval is changed after confirming a plurality of times, it is possible to reliably detect that the room temperature is equal to or lower than the set temperature and prevent malfunction.

[Brief description of the drawings]

FIGS. 1A and 1B are waveform diagrams of control signals for a heat valve for explaining an embodiment of the present invention, wherein FIG. 1A relates to one embodiment and FIG. 1B relates to another embodiment; .

FIG. 2 is a system configuration diagram showing an example of a general hot water heating device.

FIG. 3 is a waveform diagram of a control signal for a thermal valve for explaining a conventional temperature control method.

FIG. 4 is another waveform diagram of a control signal for a thermal valve for explaining a conventional temperature control method.

FIG. 5 is a diagram showing a change in room temperature in the present invention and a conventional example.

FIG. 6 is a timing chart of the operation of the thermal valve in response to a control signal for explaining the responsiveness of the thermal valve;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water heating apparatus 2 Heat source unit 3 Room 4 Radiator 5 Thermal valve 7 Room temperature sensor

Claims (3)

[Claims] 1. A hot water generated by a heat source device is supplied to a radiator installed in a room through a thermal valve, and based on a difference between a set temperature and a room temperature extracted for each set time, A method of controlling a hot water heating apparatus, wherein a ratio of an opening time of the thermal valve to the set time is adjusted to adjust an amount of hot water supplied per hour to the radiator to adjust the temperature of the room. Wherein the ratio between the opening time of the thermal valve and the set time is adjusted by changing the set time. The hot water generated by the heat source device is supplied to a radiator installed in the room through a heat valve, and based on a difference between the set temperature and the room temperature extracted at each set time, A method of controlling a hot water heating apparatus, wherein a ratio of an opening time of the thermal valve to the set time is adjusted to adjust an amount of hot water supplied per hour to the radiator to adjust the temperature of the room. By changing the opening time of the thermal valve while keeping the set time constant, the ratio between the two is adjusted, and the opening time is set to the minimum value, and the number of times set to the minimum value is reduced. A method for controlling the temperature of a hot-water heating apparatus, wherein the set time is extended when a predetermined number of times has been reached. 3. When the set time is set to a maximum value and the number of times set to the maximum value reaches a predetermined number,
The temperature control method for a hot water heating apparatus according to claim 2, wherein the set time is shortened.