JPH10232000A - Liquid piping equipment for heat utilization - Google Patents

Abstract

(57) [Problem] To reduce the required power of a pump by shortening the length of a pipe and omitting a control valve, thereby realizing resource saving of piping material and reduction of running cost. SOLUTION: A plurality of temperature control systems 11 each having two or more fan coil units 7 are connected in parallel with each other.
5 are connected in parallel through the main pipe 15 and water at a desired temperature by the heat source device 13 is sent to each temperature control system 11 through the main pipe 15 and heat exchange is performed by the temperature control system 11. In the liquid piping facility returned to the apparatus 13, the temperature control system 11 includes the fan coil unit 7, a pump 5 capable of controlling the water supply to the fan coil unit 7, and an upstream or downstream side of the pump 5. Check valve 3 which is connected to the side to prevent back flow of water and keeps the flow direction constant, fan coil unit 7, pump 5 and check valve 3
And a branch pipe 9 for connecting the

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid piping facility for utilizing heat, and more particularly to a liquid piping facility for utilizing heat using a liquid as a heat medium.

[0002]

2. Description of the Related Art It is known to transfer hot and cold heat to a predetermined heat load using a fluid such as water as a heat medium. For example, in the field of air conditioning, a method of independently air-conditioning each area (hereinafter, referred to as “zone”) obtained by dividing a building into several areas is called a zone control method. One of the piping systems used for air-conditioning each zone is a reverse return method.

As shown in FIG. 5, a liquid piping system for utilizing heat by the reverse return water method includes a control valve 61, a fan coil unit (heat exchanger) 7 as a heat utilization device, and a branch piping for each zone 73. 9 is provided.

[0004] These temperature control systems 63 are connected in parallel to a heat source device 13 having a refrigerator or the like via a main pipe 15, and the main pipe 15 is connected to a forward pipe 65 connected downstream of the heat source device 13. And return pipe 6 connected to the upstream side of heat source device 13
7.

A heat source device 13 is provided at the upstream end of the outgoing pipe 65.
A pump 69 for sending out the heat medium whose temperature has been adjusted is connected, and an upstream end of the branch pipe 9 is connected to a downstream side of the outgoing pipe 65.

The downstream end of the branch pipe 9 is connected to the upstream side of the return pipe 67, and the upstream side of the return pipe 67 to which the downstream end of the branch pipe 9 is connected is once connected to the outgoing pipe 65. The heat medium exchanged with the room air by the fan coil unit 7 is returned to the heat source device 13 at the final end Q where the heat medium is returned in the same direction. Further, in the reverse return water method, the pressure loss of each temperature control system 63 including the piping system is made equal to make the flow rate of the heat medium flowing into each temperature control system 63 the same.
Further, the control valve 61 is provided for controlling the temperature of each zone 73.

A return pipe for returning the heat medium flowing out of the temperature control system 63 in the same direction as the forward pipe 65 is hereinafter referred to as a "vertical pipe 7".
1 ". According to the Reverse Return Water Law, any zone 7
3, the downstream end Q of the vertical pipe 71 from the pump 69
The length of the flow path can be equalized, so that the heat medium exchanged by the heat source device 13 can flow into each fan coil unit 7 and the like in a well-balanced manner, and a constant flow valve is provided for each fan coil unit 7. There is an advantage that the flow rate adjusting means such as can be omitted.

[0008]

However, the reverse water method has a vertical pipe 71 for returning the heat medium flowing out of the temperature control system 63 in the same direction as the forward pipe 65. Compared with the so-called direct water return method in which the heat medium flowing out of the control system 63 is returned in the direction opposite to the forward pipe 65, the length of the pipe is longer. For this reason, there has been a problem that a large amount of piping material is consumed and construction costs are increased.

The control valve 61 provided in the temperature control system 63 is selected so that the pressure loss of the control valve 61 occupies several tens of percent of the entire temperature control system 63 in order to enhance the flow controllability. . For this reason, the pump 69 requires a large required power and causes an increase in power consumption.

Further, in a conventional liquid piping facility for utilizing heat by the reverse water method, a piping system having the largest pressure loss among piping systems reaching a plurality of temperature control systems 63 (a piping system including the temperature control system 63). ), That is, based on the pressure loss value of the piping system furthest from the pump 69, the other temperature control system 6
The pressure loss value of the piping system up to No. 3 is adjusted to be substantially the same. Therefore, there has been a problem that extra energy is required and power consumption is further increased.

An object of the present invention has been made in view of the above-mentioned problems of the prior art, and aims to save resources of piping materials, reduce construction costs, and reduce the power required for the pump 69. To achieve a reduction in power consumption.

[0012]

The present invention has the following features to attain the object mentioned above. The present invention has a plurality of temperature control systems including two or more heat exchangers, which are connected in parallel with each other, and these temperature control systems are connected in parallel to a heat source device via a main pipe, and the heat source device In a liquid piping facility in which a heat medium brought to a desired temperature is sent to each temperature control system via the main pipe, heat is exchanged in this temperature control system, and then returned to a heat source device, the temperature control system includes the heat source. An exchanger, a pump capable of controlling the capacity of supplying the heat medium to the heat exchanger, and a backflow prevention device connected upstream or downstream of the pump to prevent backflow of the heat medium and maintain a constant flow direction. And a branch pipe for connecting the heat exchanger, the pump, and the backflow prevention means.

The heat medium exchanged by the heat source device is pumped by a pump for each zone, supplied to each heat exchanger via a main pipe, and backflow prevention means. The operating capability of the pump provided in each temperature control system is adjusted according to the temperature (for example, room temperature) of each temperature control system and the set temperature.

Then, the heat medium exchanges heat with the air in the temperature control system by the heat exchanger, and the heat load corresponding to each temperature control system reaches a desired temperature. The heat exchanged heat medium is returned to the heat source device through the branch pipe and the main pipe. Thereafter, the same operation as described above is repeated.

The heat source device may be configured in any system as long as it has a function of supplying heat to the heat medium or removing heat from the heat medium. Examples of the heat source device include a heat source device such as a boiler, a cold heat source device including a refrigerator, and a heat pump.

Further, the heat source device may include a heat storage device. Examples of the heat storage device include a water heat storage tank and an ice heat storage tank. The structure of the pump is not limited as long as it has a capability of maintaining a high water supply pressure even when the flow rate of water is increased. As a pump,
For example, a line pump or a centrifugal pump can be exemplified.

The structure of the backflow prevention means is not limited as long as it has a function of preventing the backflow of the heat medium and keeping the flow direction constant.
Examples of the backflow prevention means include a swing type and a lift type depending on the structure of the valve seat.

The structure of the heat exchanger is not limited as long as it has a function of supplying heat to the heat medium or removing heat from the heat medium. An example of the heat exchanger is a fan coil unit.

The heat medium is preferably water. This is because water has a large specific heat and is easy to handle. The main pipe is connected to a bypass pipe that bypasses all temperature control systems and connects the upstream side and the downstream side of the main pipe. The bypass pipe is connected to a part of the heat medium sent from the heat source device. Circulating pump capable of controlling the ability to bypass the section and return to the upstream side of the heat source device, and backflow prevention means connected to the upstream or downstream side of the circulating pump to prevent the backflow of the heat medium and keep the flow direction constant And are preferably provided.

When the temperature difference between the temperature of the heat load corresponding to the current temperature control system and the set temperature of the load is small, or the heat consumption of the heat load in some of the plurality of temperature control systems. If there is no request, start the circulation pump,
A part of the heat medium sent from the heat source device is returned to the main pipe via the bypass pipe and the backflow prevention means. With this configuration, the flow rate of the heat medium flowing into the heat source device does not need to be reduced, and as a result, the heat exchange efficiency of the heat source device can be maintained in a high state. In addition, among the heat source devices, for example, refrigerators and the like include a device provided with a security circuit for stopping the device at a low flow rate where the amount of the introduced heat medium is equal to or less than a certain value, thereby preventing frequent stoppage of these devices. it can.

Instead of providing the circulation pump and the backflow prevention means in the above-mentioned bypass pipe line, the main pipe connected to the heat source device bypasses all temperature control systems and connects the upstream side and the downstream side of the main pipe. A bypass pipe is connected, and a delivery pump capable of controlling the ability to send out a heat medium from the heat source device is provided between the upstream end of the bypass pipe and the heat source device. A flow control valve for adjusting the flow rate of the flowing heat medium may be provided. In this case, the same operation as described above is achieved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid piping system for utilizing heat according to the present invention will be described below with reference to FIGS.

[First Embodiment] First, a liquid piping facility for heat utilization according to a first embodiment will be described with reference to FIG. The liquid piping equipment for heat utilization according to the present invention will be described using an example of an air conditioning system using a zone control system. This air conditioning system divides a building or the like into several areas, and independently air-conditions the divided zones.

For example, if the building faces east, west, north and south and has windows on each side, dividing the surrounding area with windows inside the building into an east zone, a west zone, a south zone, and a north zone, Since the temperature of each zone changes due to solar radiation or the like, it is necessary to perform air conditioning separately for each zone having a window. In addition, since the conference room requires air conditioning only when used by people, it is necessary to make this conference room an independent zone.

The liquid piping equipment 1 used for this heat utilization is
As shown in FIG. 1, a check valve (backflow prevention means) 3, a pump 5 and three fan coil units (heat exchangers) 7 are provided for each zone for performing temperature adjustment. Temperature control system 11 composed of branch pipe 9
a, 11b, and 11c.
a, 11b, and 11c are connected in parallel to the heat source device 13 via the main pipe 15, and a water (heat medium) circulation path is formed around the heat source device 13. Hereinafter, the thermal loads (air conditioning zones) 12 corresponding to the three temperature control systems 11a, 11b, 11c are changed from the upper air conditioning zone 12 in FIG. 1 to the first air conditioning zone 12a, the second air conditioning zone 12b, and the third air conditioning zone 1.
2c.

The outlet water temperature from the heat source device 13 is controlled to a constant temperature. Examples of the heat source device 13 include a cold heat source device including a refrigerator and a cooling tower, and a steam boiler and a steam / water heat exchanger. And a heat source device composed of the following.

The temperature control system 11 has a check valve 3 on its upstream side, and a pump 5 whose capacity can be controlled downstream of the check valve 3.
Are connected via a branch pipe 9, and three fan coil units 7 are connected in parallel via the branch pipe 9 to the downstream side of the pump 5. The check valve 3 may be provided downstream of the pump 5 and upstream of the fan coil unit 7. Further, the check valve 3 and the pump 5 may be provided on the downstream side of the fan coil unit 7. In this case, the check valve 3 may be provided on the upstream or downstream side of the pump 5.

The temperature control system 11 is provided with a temperature sensor 16 for detecting the temperature of the air conditioning zone 12 corresponding to the temperature control system 11. The pump 5 changes the flow rate (or flow rate) of the water flowing through the branch pipe 9 by changing the rotation speed of the impeller of the pump 5 based on the detection signal of the temperature sensor 16 and is supplied to the fan coil unit 7. By adjusting the flow rate of the cooling water, the air conditioning zone 12 can be set to the set temperature. As the pump 5, for example, a line pump or a centrifugal pump can be used.

Next, one embodiment of controlling the air conditioning zones 12 corresponding to the respective temperature control systems 11 to a set temperature will be described. One embodiment is to control the temperature of all three air conditioning zones 12a, 12b, 12c, and one or two air conditioning zones. The case where the temperature of the zone 12 is controlled will be described separately.

(1) Three air conditioning zones 12a, 12b,
In the case of controlling the temperature of all the air conditioners 12c, first, the heat source device 13 is operated, and the first air conditioning zone 12a, the second air conditioning zone 12b,
Each pump 5 and each fan coil unit 7 of the temperature control systems 11a, 11b, 11c corresponding to 2c are operated. The heat source device 13 controls its operation ability in accordance with the degree of temperature control of each of the air conditioning zones 12a, 12b, 12c to bring water to a predetermined constant temperature.

Next, the water whose temperature has been regulated by the heat source device 13 is pumped by the pumps 5 of the temperature control systems 11a, 11b and 11c and flows into the branch pipes 9 through the main pipe 15.

The water flowing into the branch pipe 9 is supplied to each of the three fan coil units 7 via the check valve 3. Since the three fan coil units 7 are connected in parallel, the pressure loss of each fan coil unit 7 and the branch pipe 9 are the same, and the pipe length of the branch pipe 9 is also the same, that is, by the reverse return water method. Since they are connected, the flow rate of water supplied to each fan coil unit 7 is the same. Therefore, all three air conditioning zones 12a, 12a
b, 12c can be set to a uniform set temperature.

Next, the heat-exchanged water flows out of the fan coil unit 7, flows through the branch pipe 9, flows into the main pipe 15, and returns to the heat source device 13 through the main pipe 15. The detection signal of the temperature sensor (room temperature sensor) 16 and the air conditioning zone 12 are provided for each of the air conditioning zones 12a, 12b, 12c.
a, 12b, and 12c are compared with the set temperatures to control the rotation speed of the impeller of the pump 5 based on the temperature difference,
The flow rate of the water flowing into the fan coil unit 7 is adjusted, and the air conditioning zones 12a, 12b, 12c corresponding to the respective temperature control systems 11a, 11b, 11c are set to the set temperatures. And
The temperature of the water is adjusted again by the heat source device 13, and thereafter, the same operation as described above is repeated.

(2) When Temperature Control of One or Two Air-Conditioning Zones 12 When controlling the temperature of the first air-conditioning zone 12a and the second air-conditioning zone 12b, the heat source device 13 is operated and the first air-conditioning zone 12a is controlled. Then, the pump 5 and the fan coil unit 7 of the temperature control systems 11a and 11b corresponding to the second air conditioning zone 12b are operated. Then, the pump 5 and the fan coil unit 7 of the temperature control system 11c corresponding to the third air conditioning zone 12c do not operate.

The heat source device 13 is an air conditioning zone 1 for controlling the temperature.
According to the number 2, the operation capacity is controlled to bring water to a predetermined constant temperature. The flow of water flowing out of the heat source device 13 and heat exchange are the same as those described in the above (1), and a description thereof will be omitted. However, the temperature control system 11c is operated by the action of the check valve 3.
Heat medium and the heat medium downstream of this system are
It is not sucked into the system a, 11b.

The combination of the air-conditioning zones 12 for controlling the temperature is not limited to the above-described one, and the temperature of only the first air-conditioning zone 12a can be controlled. In a conventional liquid piping facility for heat utilization by the reverse return water method, a vertical pipe 71 for returning water flowing out of the temperature control system 11 in the same direction as the upstream main pipe 15 connected to the heat source device 13 is provided. Although it was necessary, the vertical pipe 71 is unnecessary in the liquid piping facility 1 for heat utilization according to the first embodiment, so that the length of the pipe can be shortened and the resource of the pipe material can be saved. Can be realized.

Further, by using a pump 5 whose capacity can be controlled in place of the control valve 61 which is conventionally required for the temperature control system 11, the pressure loss of the entire temperature control system 11 can be reduced, and Power can be reduced. Therefore, power consumption can be reduced.

Further, since the pump 5 can be operated independently for each temperature control system 11 and the operating capability of the pump 5 can be controlled, power consumption can be further reduced.

[Second Embodiment] In the liquid piping equipment 1 for heat utilization according to the first embodiment, the number of air conditioning zones 12 corresponding to the temperature control system 11 for controlling the temperature is reduced, and the temperature is reduced. When the difference between the current value and the set value of the room temperature sensor 16 installed in the air conditioning zone 12 corresponding to the control system 11 is small (hereinafter, referred to as “low load”), the water flowing into the heat source device 13 Heat source device 13 with decreasing flow rate
The heat transfer performance of the heat transfer surface inside is also reduced.

Therefore, in the liquid piping equipment for heat utilization according to the second embodiment, the flow rate of water flowing into the heat source device 13 is not reduced so that the heat transfer performance of the heat transfer surface in the heat source device 13 is reduced. Is maintained in a high state, so that water adjusted to a constant temperature can be supplied to the temperature control system 11.

Hereinafter, liquid piping equipment for heat utilization according to the second embodiment will be described with reference to FIG. In the liquid piping facility 17 for heat utilization according to the second embodiment, all the temperature control systems 11a, 11b, and 11c are bypassed to the main pipe 15 connected to the heat source device 13, and the main pipe 15 is connected to the upstream side of the main pipe 15. A bypass pipe 19 connecting the downstream side is connected.

On the upstream side of the bypass line 19, a check valve 23 for preventing backflow of water and keeping the flow direction constant, and a water connected to the downstream side of the check valve 23 and discharged from the heat source device 13, Pump 2 with a controllable capacity to supply water as a heat medium to the upstream side of heat source device 13 by bypassing a part of
1 is provided. For other configurations, refer to
Since it is the same as the liquid piping equipment 1 used for heat utilization of the embodiment, the same reference numerals are given to the same aspects, and the description thereof will be omitted.

The circulation pump 21 can change the rotation speed of the impeller of the circulation pump 21 according to the degree of heat exchange in the temperature control system 11 and the number of air conditioning zones 12 requiring air conditioning. , A line pump and a centrifugal pump.

Next, three air conditioning zones 12a, 12b,
The operation of one embodiment in which the first air-conditioning zone 12a has no heat consumption request (no air-conditioning) and the second air-conditioning zone 12b and the third air-conditioning zone 12c are temperature-controlled will be described.

First, while operating the heat source device 13, the pumps 5 and the fan coil units 7 of the temperature control systems 11b and 11c corresponding to the second air conditioning zone 12b and the third air conditioning zone 12c are operated. Then, the pump 5 and the fan coil unit 7 of the temperature control system 11a corresponding to the first air conditioning zone 12a do not operate.

The water whose temperature is controlled by the heat source device 13 is sent out from the heat source device 13, passes through the main pipe 15, branches off at a portion where the bypass pipe 19 is connected, and a part of the water flows into the bypass pipe 19. Then, the remaining water flows through the main pipe 15 into the temperature control systems 11b and 11c corresponding to the second air conditioning zone 11b and the third air conditioning zone 11c. The flow of water flowing into the temperature control systems 11b and 11c, heat exchange, and the like are in accordance with the first embodiment described above, and thus description thereof is omitted.

Since the pump 5 of the temperature control system 11a corresponding to the first air conditioning zone 11a is not operated and the check valve 3 is closed, water does not flow into the fan coil unit 7 provided in the temperature control system 11a. Absent.

Accordingly, in the downstream main pipe 15 connected to the heat source device 13, the flow rate of water flowing upstream of the main pipe 15 is controlled by the temperature control corresponding to the second air conditioning zone 12b and the third air conditioning zone 12c. This is the sum of the flow rates of the water flowing out of the systems 11b and 11c, and the flow rate of the water is about 2 / compared to the case where the temperature control is required for the three air conditioning zones 12.
Decrease to 3.

The water flowing into the main pipe 15 on the downstream side flows toward the heat source device 13 through the main pipe 15. On the other hand, the circulation pump 21 sent out from the heat source device 13
The water circulating around the heat source device 13 flows through the bypass pipe 19 and joins the water flowing through the main pipe 15 via the check valve 23. Therefore, the flow rate of the water flowing into the heat source device 13 is maintained.

By the way, with regard to the operation capability of the heat source device 13, when two air conditioning zones 12 require temperature control, the operation capability is reduced as compared with three. However, as described above, since the water as the heat source is supplied to the heat source device 13 through the bypass pipe 19, even if the number of the air conditioning zones 12 requiring the temperature control is reduced, the water supplied to the heat source device 13 is reduced. The flow rate is maintained. Therefore, since the heat transfer surface of the heat source device 13 can be operated while maintaining high heat transfer performance, the state where the heat exchange efficiency is high can be maintained. Further, it is possible to prevent the operation stop of the refrigerator or the like due to the low flow rate.

The flow rate of the water flowing through the bypass pipe 19 is adjusted by changing the rotation speed of the impeller of the circulation pump 21 in accordance with, for example, the pressure difference between the inlet and outlet sides of the heat source device 13.

The combination of the air-conditioning zones 12 for controlling the temperature is not limited to the above-described one, and the temperature of the three air-conditioning zones 12 may be controlled simultaneously and the degree of the temperature control may be reduced.

According to the liquid piping system 17 for heat utilization of the second embodiment, even when the load is low, the heat flow (or flow velocity) of the water flowing into the heat source device 13 is not greatly reduced without extremely decreasing the flow rate. Keep the exchange efficiency high,
The inflowing water can be supplied to each temperature control system 11 at a desired temperature. Therefore, it is possible to improve the air conditioning efficiency of the liquid piping equipment 17 for utilizing heat and reduce the power consumption.

[Third Embodiment] In the liquid piping equipment for heat utilization according to the third embodiment, an example is shown in which a booster pump is installed. In the liquid piping equipment used for this heat utilization, at a low load, water is caused to flow into the bypass pipe 19 so that the flow rate of water flowing into the heat source device 13 is not reduced, and the heat exchange efficiency is maintained at a high state. Thus, water whose temperature has been adjusted to a constant temperature can be supplied to the temperature control system 11.

Hereinafter, liquid piping equipment for heat utilization according to the third embodiment will be described with reference to FIG. In the liquid piping facility 25 used for heat utilization according to the third embodiment, a booster pump (delivery pump) capable of sending out water from the heat source device 13 between the upstream end portion of the bypass pipe 19 and the heat source device 13 and controlling the capacity. ) 29, and the bypass pipe 19 is provided with a flow control valve 27 for adjusting the flow rate of water flowing through the bypass pipe 19. For other configurations, the liquid piping equipment 1 for heat utilization according to the second embodiment is used.
7 are the same as in FIG. 7, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

The booster pump 29 is always operated as long as the temperature control system 11 for controlling the temperature is operating. As the booster pump 29, for example, a centrifugal pump can be used.

The flow control valve 27 changes the valve opening in accordance with the degree of temperature control of the air-conditioning zone 12 corresponding to the temperature control system 11 and the number of air-conditioning zones 12 requiring temperature control. Adjust the flow rate of the water flowing through. As the flow control valve 27, for example, a two-way valve can be used.

Next, of the three air conditioning zones 12, the air conditioning of the first air conditioning zone 12a is stopped, and the second air conditioning zone 12b
The operation of the embodiment in which the temperature of the third air conditioning zone 12c is controlled will be described.

First, the heat source device 13 is operated, and at the same time, the delivery pump 29 and the pumps 5 and the fan coil units 7 of the temperature control systems 11b and 11c corresponding to the second air conditioning zone 12b and the third air conditioning zone 12c are operated. I do. First
The pump 5 and the fan coil unit 7 of the temperature control system 11a corresponding to the air conditioning zone 12a do not operate.

The water whose temperature has been adjusted by the heat source device 13 is pressure-fed from the heat source device 13 by a booster pump 29, and a part of the water is bypassed by the frictional resistance of the main pipe 15.
At a constant flow rate via the flow control valve 27 and joins the water flowing through the main pipe 15. Therefore, the heat source device 1
The water flowing into the heat source device 13 does not extremely decrease.
To a predetermined temperature.

The heat source device 13 is operated with its operating capacity reduced as compared with the case where the temperature of all the air conditioning zones 12 is controlled even at a low load, but the water heat exchange efficiency is maintained at a high level. be able to.

On the other hand, the remaining water branched on the downstream side of the booster pump 29 passes through the main pipe 15 and passes through the second air conditioning zone 12.
b and the temperature control system 11 corresponding to the third air conditioning zone 12c
b, 11c. These temperature control systems 11b, 11c
The flow of water flowing into the air conditioner, the heat exchange, and the flow of water to the temperature control system 11a corresponding to the first air-conditioning zone 12a conform to the second embodiment, and a description thereof will be omitted.

The combination of the air-conditioning zones 12 for controlling the temperature is not limited to the above-described one. The temperature control of the three air-conditioning zones 12 may be performed simultaneously and the degree of the temperature control may be reduced.

According to the liquid piping facility 25 for heat utilization of the third embodiment, the flow rate (or flow rate) of water flowing into the heat source device 13 at a low load is not significantly reduced, and the heat source device 13 Can maintain a high heat exchange efficiency. Therefore, the air-conditioning efficiency of the liquid piping equipment 25 used for utilizing heat can be improved, and the power consumption can be reduced.

By providing the booster pump 29 on the upstream side of the main pipe 15, the size of the pump 5 provided in the temperature control system 11 can be reduced.

[Fourth Embodiment] Next, a liquid piping facility for heat utilization according to a fourth embodiment will be described with reference to FIG. The liquid piping facility 31 for heat utilization according to the fourth embodiment includes a heat storage tank (heat storage device) 3 in the heat source device 13.
3 in that it is different from the liquid piping facility 1 for providing heat utilization in the first embodiment.

The basic configuration of the liquid piping facility 31 for use of heat is the same as that of the liquid piping facility 1 for use of heat in the first embodiment. Omitted.

The heat source device 32 of the liquid piping facility 31 used for this heat utilization includes a water-water heat exchanger 35, an air heat source heat pump 37 for producing heat source water, and two pumps 39a, 39b.
And a heat storage tank 33.

The water-water heat exchanger 35 exchanges heat between the water passing through the temperature control system 11 and the heat source water (cold / hot water) in the heat storage tank 33. The main pipe 15 is connected to the secondary flow path 45, and the circulation pipe 41 of the heat source water of the heat storage tank 33 is connected to the primary flow path 47.

The heat source water in the heat storage tank 33 is pumped by the pump 39b, passes through the circulation line 41, the primary flow path 47 of the water-water heat exchanger 35, and returns to the heat storage tank 33 again. The heat source water in the heat storage tank 33 is stored at a constant temperature by the air heat source heat pump 37.

The heat storage tank 33 stores the heat source water discharged from the discharge port of the circulation pipe 43 so that the heat source water discharged from the discharge port of the circulation pipe 41 does not short-circuit to the intake port of the circulation pipe 43. And the heat source water discharged from the discharge port of the circulation pipe 41 into the heat storage tank 33 and the heat storage tank 33 from the discharge port of the circulation pipe 43 in the heat storage tank 33. The heat source water discharged to the air is not mixed.

As the water-water heat exchanger 35, for example, a plate-type heat exchanger can be used. Instead of the air heat source heat pump 37, heat production equipment having a heat transfer surface such as power generation exhaust heat of a cogeneration system is used. Can be used. In addition, the form of heat storage may be ice or latent heat storage material,
The primary liquid of the water-water heat exchange may be brine or ice water slurry.

According to the liquid piping facility 31 for utilizing heat of the fourth embodiment, the heat source device 32 is provided with the heat storage tank 33, so that the installed capacity of the first heat exchanger 35 of the heat source device 32 is reduced. And the heat exchange efficiency can be improved. Therefore, it is possible to reduce the power consumption in the liquid piping facility 31 for utilizing heat.

[0074]

Other Embodiments In the first to fourth embodiments of the present invention, the detection signal of the temperature sensor 16 of the air conditioning zone 12 corresponding to the temperature control system 11 and the constant outlet water temperature flowing out of the heat source devices 13 and 32 are set. Although the operation capacity of the pump 5 is changed based on the control of the flow rate of water, the present invention is not limited to this, and the temperature of the water flowing out of the heat source devices 13 and 32 and the detection signal of the temperature sensor 16 are changed. Pumps 5, 21 and 2
The flow rate of water can also be controlled by changing the operation capacity of No. 9.

The heat source from the DHC (district cooling / heating) may be a heat source device. Further, the heat exchanger is not limited to the fan coil unit 7, but a water heat source heat pump unit, a refrigerator / refrigerator cooling unit using brine,
It can be composed of individual type devices that perform heat radiation and heat absorption such as panel heaters and fan convectors.

As the backflow preventing means, an on / off valve (two-way valve / solenoid valve) can be used in addition to the check valve. Since the diameter of the on-off valve is not reduced around the valve, the pressure loss does not increase as in the case of using a control valve.

[0077]

As described above, according to the first aspect of the present invention, there is provided a temperature control system having two or more heat exchangers connected in parallel with each other. A plurality of these temperature control systems are connected in parallel to the heat source device via a main pipe, and a heat medium brought to a desired temperature by the heat source device is sent to each temperature control system via the main pipe,
In the liquid piping equipment which returns heat to the heat source device after exchanging heat with the temperature control system, the temperature control system includes a heat exchanger, a pump capable of controlling a heat medium supply capacity to the heat exchanger, and the pump A check valve connected to the upstream or downstream side of the heat exchanger to prevent the backflow of the heat medium and keep the flow direction constant, and a branch pipe connecting the heat exchanger, the pump and the check valve, In addition, there is no need to provide a pipe for returning the heat medium flowing out of the temperature control system in the same direction as the main pipe on the upstream side, and the length of the pipe can be reduced. Therefore, it is possible to save resources of the piping material and to reduce the construction cost.

Further, since the pressure loss of the entire temperature control system can be reduced, the required power of the pump can be reduced. Therefore, power consumption can be reduced.

Further, the pump can be operated independently for each temperature control system, and the operating capacity of the pump can be controlled, so that the power consumption can be further reduced.

A bypass pipe connecting the upstream side and the downstream side of the main pipe bypassing all temperature control systems is connected to the main pipe, and the bypass pipe flows out of the heat source device. A circulating pump whose capacity can be controlled to bypass a part of the heat medium and return it to the upstream side of the heat source device, and connected to the upstream or downstream side of the circulating pump to prevent reverse flow of the heat medium and keep the flow direction constant When the degree of temperature control of the temperature control system is small or when the number of temperature control systems requiring temperature control is reduced, the heat flowing into the heat source device is provided. It is possible to maintain the heat exchange efficiency of the heat source device in a high state without extremely reducing the flow rate (or flow velocity) of the medium, and supply the flowed heat medium to a desired temperature to each temperature control system. Therefore, the equipment efficiency (for example, the refrigerator coefficient of performance) of the heat source device is improved, and the power consumption can be reduced.

A flow control valve is provided in the bypass pipe,
Even when a delivery pump capable of controlling the ability to send out the heat medium from the heat source device is provided between the upstream end of the bypass pipe and the heat source device, the equipment efficiency of the heat source device (for example, the coefficient of performance of the refrigerator) is reduced. The power consumption can be improved and the power consumption can be reduced, and the size of the pump provided in the temperature control system can be reduced.

Further, when the heat source device has a heat storage device, other equipment capacity in the heat source device can be reduced, and diversification of the heat utilization form can be achieved. Therefore, power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a liquid piping facility for utilizing heat according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a liquid piping facility for utilizing heat according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a liquid piping facility for utilizing heat according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a liquid piping facility for utilizing heat according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a conventional liquid piping facility used for heat utilization.

[Explanation of symbols]

 1, 17, 25, 31 Liquid piping equipment for heat utilization 3 Check valve (backflow prevention means) 5 Pump 7 Fan coil unit (Heat exchanger) 9 Branch pipe 11, 11a, 11b, 11c Temperature control system 13, 32 Heat source device 15 Main pipe 19 Bypass line 21 Circulation pump 23 Check valve 27 Flow control valve 29 Booster pump (delivery pump) 33 Heat storage tank (heat storage device)

Claims (4)

[Claims] 1. A heat source device comprising two or more heat exchangers, each having a plurality of temperature control systems connected in parallel with each other, and these temperature control systems being connected in parallel to a heat source device via a main pipe. In the liquid piping equipment which sends the heat medium brought to a desired temperature to each temperature control system via the main pipe, exchanges heat with this temperature control system, and returns the heat medium to the heat source device. A heat exchanger, a pump capable of controlling the capacity of supplying the heat medium to the heat exchanger, and a backflow connected upstream or downstream of the pump to prevent backflow of the heat medium and maintain a constant flow direction. A liquid piping facility for heat utilization, comprising: a prevention means; and a branch pipe connecting the heat exchanger, the pump, and the backflow prevention means. 2. A bypass pipe connecting the upstream side and the downstream side of the main pipe, bypassing all temperature control systems, is connected to the main pipe, and the bypass pipe is sent out of a heat source device. A circulating pump capable of controlling the ability to bypass part of the heat medium and return it to the upstream side of the heat source device, and connected to the upstream or downstream side of the circulating pump to prevent reverse flow of the heat medium and maintain a constant flow direction. 2. The liquid piping facility for heat utilization according to claim 1, further comprising a backflow prevention means for maintaining. 3. A bypass pipe connecting the upstream side and the downstream side of the main pipe, bypassing all temperature control systems, is connected to the main pipe, and an upstream end of the bypass pipe is connected to a heat source device. And a delivery pump capable of controlling the ability to send out the heat medium from the heat source device, and the bypass pipe is provided with a flow control valve for adjusting the flow rate of the heat medium flowing in the bypass pipe. The liquid piping facility provided for heat utilization according to claim 1, characterized in that: 4. The liquid piping facility for utilizing heat according to claim 1, wherein the heat source device includes a heat storage device.