JPH0968367A - Air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit efficient cooling or heating in accordance with the condition of a load required by cooling or heating by a method wherein the magnitude of the load, required for cooling or heating, is determined from the number of operating air conditioners among installed air conditioners and the output temperature of a heat pump and a cold heat storage tank while the operations of respective instruments are controlled in accordance with the magnitude of the load. SOLUTION: The magnitude of a load required for cooling or heating is judged by the number of fan coil units(FCU) 7 of operating air conditioners and the output water temperatures of a heat pump 1 and a cold heat storage tank 6. In this case, the number of operating FCU7 can be recognized by information, transmitted from FCU controllers 7c through control wires 10 to the CPU9 while the outlet water temperature of the heat pump 1 and the cold heat storage tank 6 correspond to the inlet water temperature of a circulation pump 20 and can be recognized by a value obtained by a water temperature sensor 37 installed near the inlet port of the circulation pump 20. According to this method, efficient cooling and heating can be effected by controlling the operations of respective instruments from the level of the magnitude of a load required by cooling or heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs cooling and heating by performing heat exchange between a heat pump, a water heat exchanger and an air heat exchanger using a heat medium, and storing cold heat in a cold heat storage tank. The present invention relates to an air conditioning system.

[0002]

2. Description of the Related Art Conventionally, there is a system that uses a heat pump (heat source) for air conditioning and hot water supply. Heat pump
It has a compressor (compressor) and an expansion valve inside, and uses a heat exchanger such as a water heat exchanger, an air heat exchanger, piping connecting these, and a CFC flowing in the piping. The direction is controlled by a valve installed on the pipe, and heat is released or absorbed to perform air conditioning or hot water supply.

[0003]

However, the above heat pump can utilize outside air or exhaust heat as a heat source,
Although it is a heat source with high energy-saving effect, there is no one that can efficiently perform heating / cooling according to the load condition of heating / cooling demand.

The present invention has been made in view of the above points, and an object of the present invention is to provide an air conditioning system for efficiently performing cooling / heating in accordance with the load condition of the cooling / heating request. It is in.

[0005]

The invention according to claim 1 is
A heat pump having a compressor, a water heat exchanger, and an air heat exchanger are connected by a first pipe, heat is exchanged by a heat medium flowing in the pipe, and cold heat is stored for cooling and heating. A heat tank, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, and cooling or air conditioning is performed by water or an antifreeze liquid flowing in the second pipe, and the operation of each device is controlled by a controller. In the air-conditioning system, the control unit determines the magnitude of the load of the cooling and heating request based on the number of operating air conditioners and the outlet water temperature of the heat pump / cooling heat storage tank, and determines the load. It is characterized in that the operation of each device is controlled according to the size of.

According to a second aspect of the present invention, there is provided a heat pump having a compressor, a water heat exchanger, and an air heat exchanger.
And a heat storage medium that flows in the pipe to perform heat exchange, and a cool storage heat tank for storing cool heat for cooling and heating, an air conditioner for cooling and heating, and the water heat exchanger second In the air-conditioning system, the air-conditioning system is configured such that the control unit controls the operation of each device by cooling and heating air-conditioning with water or antifreeze flowing in the second pipe. It is characterized in that the magnitude of the load required for cooling and heating is determined based on the return pipe water temperature, and the operation of each device is controlled according to the magnitude of the load.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air conditioning system showing an example of an embodiment of the present invention. 1 is a heat pump (heat source device), a compressor (compressor)
1a, expansion valve 1b, piping 1c, heat pump controller 1d, compressor controller 1e.
2 is a water heat exchanger on the hot water storage side, 3 is a water heat exchanger on the air conditioning side, and 4 is an air heat exchanger. Each exchanger and the heat pump 1 are connected by a pipe 1c. A heat medium such as CFC flows in the pipe 1c, and heat exchange is performed by compression, expansion, liquefaction, and vaporization of the heat medium, and functions such as cooling and heating and boiling water are performed. In addition, in this Embodiment, although the piping 1c is simplified and described for convenience,
Actually, the direction of the flow of the heat medium can be changed during cooling, heating or hot water storage, and the heat exchanger 2 used depending on the situation.
In order to change the combination of 4 to 4, a large number of valves are provided and the structure is complicated. The compressor controller 1e controls the inverter frequency of the compressor 1a.

Reference numeral 5 denotes a hot water storage tank, which is connected to the water heat exchanger 2 through a pipe 18 and performs a hot water storage operation with the heat pump 1 via the water heat exchanger 2. In the heat pump 1, a high-temperature and high-pressure heat medium is sent to the water heat exchanger 2 by the compressor 1a. On the hot water storage tank 5 side, water flowing through the hot water storage tank 5 and the pipe 18 is sent to the water heat exchanger 2 by the hot water storage pump 11. In FIG. 1, from the bottom of the hot water storage tank 5 to the hot water storage tank 5
The water inside is taken up by the hot water storage pump 11, and the valve 1
It is sent to the water heat exchanger 2 via 2. In the water heat exchanger 2,
The heat exchange with the high-temperature heat medium of the heat pump 1 is performed, and the water from the hot water storage tank 5 receives the heat here and becomes hot water, which is returned to the upper part of the hot water storage tank 5 and the hot water is stored in the hot water storage tank 5.
The valve 12 is a proportional valve for temperature adjustment, and is for controlling the amount of water flowing through the pipe 18 in order to keep the hot water produced at a constant temperature. That is, the outlet temperature of the hot water of the water heat exchanger 2 is detected by the sensor 12c, and the opening rate of the valve 12 is changed by the valve opening / closing controller 12a based on this information. For example, if the temperature of the hot water is lower than the set value, the outlet temperature of the water heat exchanger 2 is increased by decreasing the flow rate, and if the temperature of the hot water is higher than the set value, the outlet rate of the heat exchanger 2 is increased by increasing the flow rate. Try to lower the temperature. To use the hot water, the hot water is taken out from the upper part of the hot water storage tank 5 in FIG.
The hot water temperature during use is adjusted by mixing with the tap water 22. Then, a pumping pump 25 is provided as needed to send hot water to a faucet 26 in a sink 27, a bathtub, a wash basin 27 or the like. Here, the amount of hot water used in the hot water storage tank 5 is constantly supplied from the water supply 22 connected to the lower portion of the hot water storage tank 5. In addition, the water shutoff valve 2 between the water supply 22 and the hot water storage tank 5
No. 3 is normally open.

Next, the air conditioning operation will be described. In the air conditioning operation, heat energy is exchanged between the heat pump 1, the cold storage tank 6 and the air conditioner (fan coil unit: FCU) 7 via the water heat exchanger 3. First, the operation during cooling will be described. In the heat pump 1, the heat medium atomized at low pressure by the expansion valve 1b is sent to the water heat exchanger 3. On the air conditioning side where the cold storage heat storage tank 6 is provided, the cold storage heat storage tank 6, the pipe 19,
The water flowing through the mixing tank 21 (however, the inside of the cold storage heat tank 6 needs to be kept at 0 degrees or less during cooling, and an antifreeze liquid (brine water) is used here) is sent to the water heat exchanger 3 on the air conditioning side. In the water heat exchanger 3, the atomized heat medium takes heat from the brine water in the pipe 19 and vaporizes it. As a result, the brine water in the pipe 19 is cooled. Is the cooled brine water once stored in the cold storage tank 6?
Alternatively, it is directly sent to the mixing tank 21. The mixing tank 21 further includes an FCU 7 and pipes 19a, 19b and F.
A CU pump 15 is provided, and cold water is sent from the pipe 19a to the FCU 7 by the pump 15 and allowed to cool,
The warmed water returns to the mixing tank 21 through the pipe 19b. In the mixing tank 21, the water heat exchanger 3 and the cold storage heat tank 6
The brine water on the FCU 7 side is mixed with the brine water on the FCU 7 side, and the brine water sent to the FCU 7 side is obtained by mixing the cooling water directly from the water heat exchanger 3 or the cooling water from the cold storage heat tank 6. Is cooled to an appropriate temperature and cooled. Generally, the temperature of the brine water cooled by the water heat exchanger 3 is about -3 degrees, and the temperature of the water mixed in the mixing tank 21 and sent to the FCU 7 side is adjusted to about 5 to 7 degrees. Further, during cooling, since the bag 6a containing water in the cold storage heat tank 6 freezes below the freezing point, cold energy can be stored as latent heat. Switching from the water heat exchanger 3 directly to the mixing tank 21 or once storing in the cold storage heat tank 6, that is, switching between direct air conditioning and indirect air conditioning
The directional valve 13 is used.

In the FCU 7, cold water (brine water) sent through the pipe 19a is sent into the coil 7b. The room air 34 is sucked in through the intake port 7f by the fan 7a, passes through the coil 7b, and is again sent into the room through the blow port 7g. Here, the room air 34 is cooled when passing through the coil 7b cooled by cold water. The valve 7d is opened when used and closed when not used. In this way, by applying cooling energy to the air, the warmed brine water returns to the mixing tank 21, is mixed and cooled with the cooled brine water from the water heat exchanger 3 or the cold storage heat tank 6, and is again cooled. FCU by pump 15
Sent to 7.

On the other hand, during heating, the flow of the heat medium in the heat pump 1 is opposite to that during cooling, and the high temperature heat medium from the compressor 1a is sent to the water heat exchanger 3 on the air conditioning side. As a result, the pipe 19 on the air conditioning side receives heat, and the hot brine water is sent to the FCU 7 for heating.
The other basic operations are the same as during cooling, so description will be omitted. In addition, the brine hot water at the time of heating is about 60 degrees, FCU
The water temperature sent to 7 is adjusted to about 45 degrees.

The control of the operation of each device described above is performed by the CPU 9 through the control line 10 based on the set value externally set by the control panel 8.

Reference numeral 28 is a room, 29 is a corridor, 30 is a ceiling, 31 is under the floor, 32 is a room ventilation port, and 33 is a central ventilation port.

According to the air conditioning system of the present embodiment, air conditioning and hot water supply can be performed by the same heat pump 1,
Since the hot water storage tank 5 is provided, the hot water produced can be stored. Since the cold storage heat tank 6 is provided, cooling energy can be stored in the summer and heating energy in the winter.

Here, in the present embodiment, the magnitude of the load required for cooling and heating is determined by the number of operating FCUs 7 and the outlet water temperature of the heat pump 1 and the cold storage tank 6. That is, the number of operating FCUs 7 can be recognized by sending information from the FCU controller 7c to the CPU 9 through the control line 10, and the outlet water temperature of the heat pump 1 / cooling heat storage tank 6 corresponds to the inlet water temperature of the circulation pump 20. , A water temperature sensor 3 installed near the inlet of the circulation pump 20
It can be recognized by the value obtained in 7. Now, considering the case where six FCUs 7 are installed, a maximum of six FCUs 7 will operate. Therefore, for example, assuming that the number of operating FCUs 6 is divided into three levels (1 to 2 are operating, 3 to 4 are operating, and 5 to 6 are operating), as shown in FIG. The number of FCU7 in the above is 3
It is determined which one of the two levels, and then, for each of the levels, the outlet water temperature of the heat pump 1 / cooling heat storage tank 6 is high or low depending on the temperature detected by the water temperature sensor 37 (in winter, for example, -5 degrees Celsius). Lower cases, between −5 degrees and 5 degrees, higher than 5 degrees, and in summer, lower than 50 degrees, between 50 degrees and 60 degrees, and higher than 60 degrees). Therefore, the number of operating FCU7 and heat pump 1
The level of the load of the cooling / heating request is determined based on the level of the outlet water temperature of the cold storage heat tank 6. Depending on the summer or winter, the difference between cold water and hot water and the level relationship of the water temperature levels are opposite. Therefore, first determine whether the season is summer or winter, and then perform the above determination. I'm trying to do. If the cooling and heating are adjusted by controlling the operation of each device based on the level of the load magnitude of the cooling and heating request determined in this way, the operation according to the load can be performed and energy saving can be achieved.

Further, as another embodiment, the magnitude of the load required for cooling and heating is determined by the FCU 7 flowing through the pipe 19 on the air conditioning side.
Return pipe water temperature from. The return pipe water temperature from the FCU 7 becomes the water temperature near the return port of the mixing tank 21 of the return pipe 19b on the air conditioning side, and is detected by the water temperature sensor 38 provided near the return port of the mixing tank 21 of the return pipe 19b. In the present embodiment, the temperature of the water sent to the FCU 7 is set to be substantially constant in both summer and winter, so the load magnitude can be estimated by measuring the temperature of the return water in the return pipe 19b. . That is, as shown in FIG. 3, in the summer,
When the water temperature detected by the water temperature sensor 38 is lower than 10 degrees, it is determined that the load level is low, and the water temperature is from 10 degrees to 15 degrees.
When the water temperature exceeds 15 degrees, it is determined that the load level is high. Also,
In winter, the water temperature detected by the water temperature sensor 38 is 42
When the water temperature is between 38 and 42 degrees, it is determined that the load level is normal, and when the water temperature is less than 38 degrees, the load level is high. In this way, the load can be estimated from the water temperature detected by the water temperature sensor 38. In addition,
Also in this embodiment, depending on summer or winter, cold water,
Since the difference in hot water and the vertical relationship of the water temperature level determination are opposite to each other, it is first determined whether the season is summer or winter, and then the above determination is performed.

According to the present embodiment, the level of the load level of the cooling / heating request can be judged only from the water temperature detected by the water temperature sensor 38, and the cooling / heating can be controlled by controlling the operation of each equipment based on this judgment. Since it can be adjusted, effective driving can be performed more easily and energy can be saved.

In the present embodiment, a system capable of both hot water supply and air conditioning has been described, but it goes without saying that the present invention may be a system without hot water supply.

[0019]

As described above, according to the first aspect of the invention, the heat pump having the compressor, the water heat exchanger and the air heat exchanger are connected by the first pipe, and the heat flowing in the pipe is connected. In addition to performing heat exchange by a medium, a cool storage tank for storing cool heat for cooling and heating, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, and the inside of the second pipe is In an air conditioning system in which cooling and heating air conditioning is performed by flowing water or antifreeze liquid, and the operation of each device is controlled by a controller, in the controller, the number of operating air conditioners and a heat pump
Based on the outlet water temperature of the cold heat storage tank, the size of the load of the cooling and heating request is determined, and the operation of each device is controlled according to the size of the load, so by determining the size of the load, It was possible to provide an air conditioning system that efficiently performs heating and cooling according to the load condition of the heating and cooling demand.

According to the second aspect of the invention, the heat pump having the compressor, the water heat exchanger and the air heat exchanger are connected by the first pipe, and heat is exchanged by the heat medium flowing in the pipe. In addition, a cold storage heat tank for storing cold heat for cooling and heating, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, and cooling and heating air conditioning is performed by water or an antifreeze liquid flowing in the second pipe. In the air conditioning system configured to control the operation of each device by the control unit, the control unit determines the magnitude of the load of the cooling and heating request based on the return pipe water temperature from the air conditioner, Since the operation of each device is controlled according to the size of, the size of the load can be determined more easily,
It was possible to provide an air conditioning system that efficiently performs heating and cooling according to the determined load magnitude.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioning system showing an example of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an operation according to the above.

FIG. 3 is a flowchart for explaining an operation according to another embodiment of the present invention.

[Explanation of symbols]

 1 Heat Pump 1a Compressor 1b Expansion Valve 1c Piping 1d Heat Pump Controller 1e Compressor Operating Frequency Controller 2 Water Heat Exchanger 3 Water Heat Exchanger 4 Air Heat Exchanger 5 Hot Water Tank 6 Cold Storage Heat Tank 7 FCU (Fan Coil Unit) 7a Fan 7b Coil 7c FCU controller 7d Open / close valve 7e FCU control panel 7f Inlet port 7g Blower port 8 Control panel 9 CPU 10 Control line 11 Hot water pump 12 Temperature proportional valve 12a Valve controller 12c Temperature sensor 13 Direct switching 3-way valve 13a Valve controller 14 Cold storage tank outlet valve 14a Valve controller 15 FCU pump 15a FCU pump controller 16 Ventilation fan 16a Ventilation fan controller 17 Heater Knit 17a Heater 17b Heater pump 17c Heater controller 18 Hot water storage side pipe 19 Air conditioning side pipe 19a FCU side forward pipe 19b FCU side return pipe 20 Circulation pump 20a Circulation pump controller 21 Mix tank 22 Water supply 23 Water stop valve 24 Mixing valve 25 For pumping Pump 26 Faucet 27 Sink, bathtub, wash basin, etc. 28 Room 29 Corridor 30 Ceiling 31 Underfloor 32 Room ventilation port 33 Central ventilation port 34 Indoor air 35 Indoor air 36 Air heat exchange air flow 37 Water temperature sensor 38 Water temperature sensor

Claims (2)

[Claims] 1. A heat pump having a compressor, a water heat exchanger, and an air heat exchanger are connected by a first pipe,
While performing heat exchange by the heat medium flowing in the pipe, a cool storage tank for storing cold heat for cooling and heating, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, In an air conditioning system in which cooling or heating air conditioning is performed by water or an antifreeze liquid flowing in the second pipe, and the operation of each of the devices is controlled by the control unit, the control unit operates in the air conditioner. An air conditioning system, characterized in that the size of a load required for cooling and heating is determined based on the number and the outlet water temperature of the heat pump / cooling heat storage tank, and the operation of each device is controlled according to the size of the load. 2. A heat pump having a compressor, a water heat exchanger, and an air heat exchanger are connected by a first pipe,
While performing heat exchange by the heat medium flowing in the pipe, a cool storage tank for storing cold heat for cooling and heating, an air conditioner for cooling and heating, and the water heat exchanger are connected by a second pipe, In an air conditioning system in which cooling or heating air conditioning is performed by water or an antifreeze liquid flowing in the second pipe, and the operation of each device is controlled by a control unit, the control unit, based on the return pipe water temperature from the air conditioner, An air conditioning system characterized in that the size of a load required for cooling and heating is determined and the operation of each device is controlled according to the size of the load.