JP2001235182A - Air conditioning system for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system for a building which can be manufactured at reduced manufacturing costs by using a plate type heat exchanger as a condenser and can be operated efficiently by a simple control system without circulation of a refrigerant being hindered, in an air conditioning system having a secondary side, in which a refrigerant is circulated, connected with a gravitation type heat pipe. SOLUTION: The air conditioning system for the building has the secondary side, in which the refrigerant is circulated, connected with the gravitation type heat pipe. The plate type heat exchanger is used as the condenser, and water temperature difference between water temperatures at an inlet and an outlet on the primary side of the condenser is monitored or water temperature at the outlet in the case the temperature at the inlet is constant is monitored. In this system, water flow rate on the primary side is controlled in such a manner that the water temperature difference between the water temperatures at the inlet and the outlet or the water temperature at the outlet coincides respectively with a water temperature difference between the water temperatures at the inlet and the outlet, or a water temperature at the outlet at a secondary side peak load, which is known in advance, irrespective variation of the secondary side load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building air conditioning system in which a secondary side through which a refrigerant circulates is connected to a gravity heat pipe, and more particularly to a condenser air conditioner connected to a gravity heat pipe and a building air conditioning system related to control thereof. Belongs to the field.

[0002]

2. Description of the Related Art Conventionally, in a building air-conditioning system, water is usually used as a heat medium for transferring heat between a heat source device and an air conditioner. There is a case where it is installed, and there is a risk of water leakage in the living room, so it is not preferred. In recent years, attention has been paid to a system that directly guides a refrigerant from a heat source device to a heat exchanger of an air conditioner in a building air conditioning system.For example, an outdoor unit such as a heat pump is installed outdoors as a heat source device on a roof or the like,
On the other hand, on the indoor living room side, an indoor unit directly connected with a refrigerant pipe from an outdoor unit is installed as an air conditioner to perform cooling and heating.

[0003] These prior arts are disclosed, for example, in Japanese Patent Application Laid-Open No. 1-17 / 1990.
No. 4834 and Japanese Patent Application Laid-Open No. 6-265176 have already been proposed. As shown in FIG. 1, a cooling water connected to a heat pump chiller (not shown) or the like is cooled on the primary side by a pump e. By shell tube heat exchanger (condenser d)
Is a building air-conditioning system connected to a gravity-type heat pipe that circulates naturally by utilizing the phase change between the liquid and gas of the secondary-side refrigerant. Each air conditioner a of this building air conditioning system adjusts the supply amount of the refrigerant liquid to the evaporator c by the expansion valve b in order to process the load, and the refrigerant gas after heat exchange in the evaporator c has the lowest pressure in the system. The refrigerant gas in the condenser d is condensed by the cold water conveyed by the pump e, becomes a refrigerant liquid, is stored in the receiver f, and the stored refrigerant liquid is caused by gravity. Reach and circulate to expansion valve b.

As described above, the circulation force of the refrigerant gas in the gravity heat pipe is a pressure difference, and the circulation force of the refrigerant liquid is the gravity (head).
Therefore, since the circulation force of the refrigerant is not large unlike the supply of a pump or the like, the passage resistance in the condenser d, which is a heat exchanger, is required to be small, and the refrigerant flow path is wide. However, the smallest possible shell tube heat exchanger is adopted as the condenser d of the gravity heat pipe.

[0005]

As described above, a shell tube type heat exchanger having a wide refrigerant flow path is employed as a condenser of a building air conditioning system, but the shell tube type heat exchanger is a plate type heat exchanger. There is a problem that the volume is large compared with the exchanger, which is disadvantageous in terms of space, and is expensive. Therefore, it is conceivable to use an inexpensive plate heat exchanger instead of the shell tube heat exchanger as the condenser of the gravity heat pipe. When a plate-type heat exchanger is adopted, whereas the passage resistance of the heat exchanger is required to be small, the gap between the plates of the plate-type heat exchanger is small, and the passage resistance of the refrigerant flow path is large. In particular, there is a problem that when a partial load state is reached in the morning or the like, the refrigerant d is held in the heat exchanger in combination with the lower pressure of the condenser d, and the circulation of the refrigerant is hindered. , Currently not used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a plate type heat exchanger as a condenser in a building air conditioning system in which a secondary side through which a refrigerant circulates is connected to a gravity type heat pipe. To provide a building air-conditioning system that is easy to maintain by reducing the production cost and efficiently operating the air conditioning system with a simple control system without hindering the circulation of the refrigerant liquid. is there.

[0007]

According to a first aspect of the present invention, there is provided a building air-conditioning system in which a secondary side through which a refrigerant circulates is connected to a gravity-type heat pipe. Using a heat exchanger and monitoring the difference in water temperature at the inlet and outlet on the primary side of the condenser, or monitoring the outlet water temperature if the inlet water temperature is constant,
This is a building air conditioning system that controls the inlet / outlet water temperature difference or the outlet water temperature to a predetermined value regardless of a change in load on the secondary side. In order to solve the above problems, the invention according to claim 2 uses a plate-type heat exchanger as a condenser in a building air conditioning system in which a secondary side through which a refrigerant circulates is connected to a gravity heat pipe. Monitor the water temperature difference at the inlet and outlet on the primary side of the condenser, or if the inlet water temperature is constant, monitor the outlet water temperature, regardless of the load fluctuation on the secondary side, the outlet water temperature difference or the outlet water temperature. To
This is a building air-conditioning system that controls the amount of water on the primary side so that the temperature difference between the inlet and outlet ports or the outlet water temperature at the time of peak load on the secondary side is known in advance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The essence of the present invention is that in the cooling cycle of a gravity heat pipe, even if an inexpensive plate heat exchanger is used as a condenser, the circulation power of the refrigerant is not hindered. However, for this purpose, the capacity of the condenser is controlled by supplying the water quantity of the primary heat quantity corresponding to the load which is the secondary heat quantity to the condenser. Specifically, instead of monitoring and controlling the load due to the refrigerant of the secondary heat amount as a means of controlling the capacity of the condenser, the air conditioning system is monitored and controlled by monitoring only the water amount of the primary medium. Although it is operated, it responds to fluctuations in the load of the secondary heat as a result. More specifically, by monitoring the difference in water temperature between the inlet and outlet of the cooling water in the condenser, or the outlet water temperature when the inlet water temperature is constant, and controlling the amount of cold water on the primary side so that the value becomes constant. is there.

A preferred embodiment of a building air-conditioning system according to the present invention will now be described with reference to the drawings. [Embodiment 1] A first embodiment of the present invention will be described with reference to FIG. 2. On the primary side, cooled water connected to a heat pump chiller (not shown) or the like is supplied by a pump 1 by a three-way valve. The water is supplied to the inlet 31 of the condenser 3 which is a plate-type heat exchanger via the pipe 2, and the water subjected to heat exchange is discharged from the outlet 32 of the condenser 3. The three-way valve 2 is controlled by a drive mechanism 21,
Part of the cold water from the heat pump chiller or the like is guided from the bypass passage 23 directly to the outlet 32 side without passing through the condenser 3. Then, the temperature data from the inlet temperature sensor 4 provided near the inlet 31 of the condenser 3 and the temperature data from the outlet temperature sensor 5 provided near the outlet 32 of the condenser 3 are sent to the arithmetic and control unit 22. The driving mechanism 21 of the three-way valve 2 is input and calculated by a calculation controller 22 and the output thereof is used to control the driving mechanism 21 of the three-way valve 2.
On the other hand, the refrigerant liquid in which the refrigerant is liquefied is discharged to the outlet 33 on the secondary side of the condenser 3, and the discharged refrigerant liquid is temporarily stored in the vertical liquid receiver 6 and is supplied to each air conditioner 7 by gravity. Sent. This refrigerant liquid adjusts the supply amount of the refrigerant liquid to the evaporator 72 by the expansion valve 71, and the adjusted refrigerant liquid exchanges heat with the evaporator 72 of the air conditioner 7 to become a refrigerant gas, and the heat is converted by the evaporator 72. The exchanged refrigerant gas is sucked into the condenser 3 having the lowest pressure in the system, and the sucked refrigerant gas in the condenser 3 is condensed by the cold water transported by the pump 1 and circulates as a refrigerant liquid.

Here, the structure of the condenser 3 which is a plate heat exchanger used in this embodiment will be described with reference to FIG. 3. A plurality of conductive plates 36 are laminated between a pair of frames 351 and 352. A primary-side cooling water passage 37 and a secondary-side refrigerant passage 38 are alternately formed between the conductive plates 36, and the cooling water passage 37 is provided on one frame.
The coolant passage 38 is configured to communicate with the inlet 33 of the coolant gas on the secondary side and the outlet 34 of the coolant liquid on the secondary side so as to communicate with the inlet 31 and the outlet 32 of the cooling water on the primary side provided in the 351. You.
That is, the cooling water inlet 31 mainly communicates only with the water circulation hole 311 of the conduction plate 361 forming the cooling water passage 37, and the outlet 32 mainly forms the water circulation hole 3 of the conduction plate 361 forming the cooling water passage 37.
The refrigerant gas inlet 33 communicates only with the refrigerant gas passage hole 331 of the conduction plate 362 that mainly forms the refrigerant passage 38, and the refrigerant gas outlet 34 mainly communicates with the refrigerant plate 38 that forms the refrigerant passage 38. It is configured to communicate only with the refrigerant liquid circulation hole 341 of 362. Thus, the cooling water on the primary side is
The cooling plate 36 cools the conduction plate 36 while passing through the narrow cooling water passage 37 sandwiched by, and the refrigerant on the secondary side passes through the narrow refrigerant passage 38 sandwiched between the plates of the cooled conduction plate 35. The cooling gas is cooled by the conductive plate 36 and is discharged to the receiver while undergoing a phase change from the refrigerant gas to the refrigerant liquid.

[Operation] Since the first embodiment has the above configuration, it is controlled and driven as follows. First, assuming that the water temperature at the inlet temperature sensor 4 of the condenser 3 at the peak load on the secondary side is T1, the water temperature at the outlet temperature sensor 5 is T2, and the amount of water flowing through the condenser 3 is L, the air conditioner in the morning, etc. In the partial load state where the operation rate of the machine is low, the load on the secondary side decreases and the amount of circulating refrigerant decreases, so that the amount of heat exchange in the condenser 3 decreases.
Here, if the amount of water L is the same as at the time of the peak load, the refrigerant liquid is supercooled, the pressure in the condenser 3 is reduced, and the refrigerant liquid between the plates acts so as to prevent spontaneous fall. On the secondary side, the outlet water temperature T2 decreases and the inlet / outlet water temperature difference ΔT decreases. Therefore, in the present embodiment, the inlet / outlet water temperature difference ΔT is monitored, and the arithmetic and control unit 22 controls the three-way valve 2 with respect to the condenser 3 so that the temperature difference at the peak load when the valve is fully opened, ie, the temperature difference ΔT3 =
The water amount L is controlled so as to be the set value of T2−T1, but when the load on the secondary side is reduced, the inlet / outlet water temperature difference ΔT is reduced, so that the inlet / outlet water temperature difference ΔT is increased.
L, that is, the amount of water L to the condenser 3 at the three-way valve 2 is reduced.
Is discharged to the heat pump chiller, whereby the amount of water L to the condenser 3 is adjusted so as to decrease.
Since the pressure in the condenser 3 does not fluctuate, the circulation of the gravity heat pipe is continuously established without holding the refrigerant liquid in the condenser 3. Conversely, when the operating rate of the air conditioner increases and the load increases, the amount of circulation of the refrigerant increases.Therefore, when the outlet water temperature T2 rises and the inlet / outlet water temperature difference ΔT increases and deviates from the set value, it is detected by an inlet temperature sensor. 4, the outlet temperature sensor 5, and the water amount L is detected by the arithmetic and control unit 22 to increase the temperature difference ΔT3, which is the set value at the time of peak load, that is, the inlet / outlet water temperature difference ΔT is reduced. Works as follows. Therefore, without monitoring the secondary-side load fluctuation of the condenser 3, the primary-side water temperature difference ΔT is monitored, and the water amount L is adjusted so that the value becomes constant. However, the refrigerant liquid is not retained in the heat exchanger 3 and the capacity of the condenser 3 can always be controlled. As a result, when the plate heat exchanger is used as the condenser 3, Even if the load of the side heat quantity fluctuates, it is possible to operate the building air conditioning system only by controlling the primary side heat quantity, which is a problem when the condenser 3 of the plate heat exchanger is used. The inconvenience of holding the refrigerant liquid in the condenser 3 can be eliminated.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. 4. The difference from the first embodiment is that a three-way Instead of the valve 2, a two-way valve 2a capable of controlling the flow rate is used.
Other configurations are the same as those of the first embodiment. Therefore, the description of the same configuration as that of the first embodiment will be omitted, and the different configuration and operation will be described. The second embodiment also monitors only the amount of water L in the primary medium and controls only the amount of heat on the primary side even if the load of the amount of heat on the secondary side fluctuates. Therefore, the temperature difference between the inlet and outlet of the cooling water in the condenser 3 is monitored, and the amount L of the cooling water on the primary side is controlled so that the value becomes constant. The temperature data from the inlet temperature sensor 4 provided near the inlet 31 and the temperature data from the outlet temperature sensor 5 provided near the outlet 32 of the condenser 3 are input to the arithmetic controller 22 for arithmetic control. The output is operated by the drive mechanism 21 of the two-way valve 2a, and the flow rate L to the condenser 3 is directly controlled by the two-way valve 2a. On the other hand, as in the first embodiment, the refrigerant liquid obtained by liquefying the refrigerant is discharged to the outlet 33 on the secondary side of the condenser 3, and the discharged refrigerant liquid is temporarily stored in the horizontal liquid receiver 6 and gravity is applied. Sent to each air conditioner 7. In addition, although the vertical type liquid receiver was used as the liquid receiver 6 in Example 1, and the horizontal type liquid receiver was used in Example 2, it may be suitably selected and used according to the whole air conditioning system or the condition of the equipment environment. . The operation is almost the same as that of the first embodiment, except that the temperature difference ΔT between the inlet and outlet is monitored, and the arithmetic controller 22 controls the temperature difference at the peak load when the two-way valve 2a is fully opened with respect to the condenser 3, that is, Temperature difference ΔT3 = T2
Control is performed such that the amount of water L to the condenser 3 at the two-way valve 2a decreases so as to reach the set value of -T1. That is, when the operation rate of the air conditioner is low and the load on the secondary side is reduced, the inlet / outlet water temperature difference ΔT is reduced. It operates so as to directly reduce the amount of water L in the tank. Conversely, when the operation rate of the air conditioner increases and the load on the secondary side increases, the circulation amount of the refrigerant increases, so that the outlet water temperature T2 increases and the inlet / outlet water temperature difference ΔT increases. In order to approach the temperature difference ΔT3 which is the set value,
That is, the operation is performed so as to increase the water amount L so as to reduce the inlet / outlet water temperature difference ΔT. Therefore, even if the condenser 3 which is a plate heat exchanger is used, the water temperature difference ΔT at the inlet and outlet on the primary side is monitored without monitoring the load fluctuation on the secondary side of the condenser 3 and the value is kept constant. By adjusting the water amount L so that the refrigerant liquid does not remain in the heat exchanger 3 even when the load on the secondary side fluctuates, the building air conditioning system can be operated.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. 5. The difference from the first embodiment is that the inlet temperature sensor 4 in the first embodiment is omitted. The other configuration is the same as that of the first embodiment. Therefore, the description of the same configuration as that of the first embodiment is omitted, and the above-described different configuration and operation will be described. However, in the third embodiment, when the temperature of the cold water on the primary side is substantially constant in the building air conditioning system, In this case, a building air-conditioning system is constructed at a lower cost. Also in the third embodiment, a plate heat exchanger is used as the condenser 3, and when the inlet water temperature on the primary side of the condenser 3 is almost constant, only the outlet water temperature is monitored, and the outlet water temperature is set to a predetermined value. By controlling only the amount L of water in the primary medium so that the load on the secondary heat quantity fluctuates, the building air conditioning system can be operated only by controlling the primary heat quantity. It is. In the case of the third embodiment, since the inlet water temperature is almost constant, if this value is input to the arithmetic controller 22a in advance and the outlet water temperature T is detected by the outlet sensor 5, the condenser 3 Since the inlet / outlet water temperature difference ΔT on the primary side is detected and the arithmetic and control unit 22a operates in the same manner as in the first embodiment, the description is omitted. However, the arithmetic and control unit 22a uses the three-way valve 2 as in the first embodiment. Operation control. Therefore, even in the third embodiment, even when the condenser 3 which is a plate-type heat exchanger is used, the water temperature difference ΔT on the primary side is monitored without monitoring the load fluctuation on the secondary side of the condenser 3 and its value is monitored. By adjusting the amount of water L so as to be constant, the refrigerant liquid is not retained in the heat exchanger 3 even if the load on the secondary side fluctuates, and the building air conditioning system can be operated. .

[Embodiment 4] Next, a fourth embodiment of the present invention will be described with reference to FIG. 6. The difference from the second embodiment is that the inlet temperature sensor 4 in the second embodiment is omitted. The other configuration is the same as that of the first embodiment. Therefore, the description of the same configuration as that of the second embodiment will be omitted, and the above-described different configuration and operation will be described. However, in the fourth embodiment, the temperature of the primary-side cold water in the building air-conditioning system is almost the same as in the third embodiment. In certain cases, the building air conditioning system is correspondingly constructed at a lower cost. That is, in the case of the fourth embodiment, since the inlet water temperature is substantially constant, if this value is input in advance to the arithmetic and control unit 22a and the outlet water temperature T is detected by the outlet sensor 5, the condenser 3 Since the inlet / outlet water temperature difference ΔT on the primary side is detected and the arithmetic and control unit 22a operates in the same manner as in the second embodiment, a description thereof will be omitted.
The operation of the two-way valve 2a is controlled by 22a in the same manner as in the second embodiment.
Therefore, even in the fourth embodiment, even if the condenser 3 which is a plate heat exchanger is used, the water temperature difference ΔT on the primary side is monitored without monitoring the load fluctuation on the secondary side of the condenser 3 and the value thereof is monitored. By adjusting the amount of water L so as to be constant, the refrigerant liquid is not retained in the heat exchanger 3 even if the load on the secondary side fluctuates, and the building air conditioning system can be operated. .

Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIG. 7. The difference from the first embodiment is that a three-way valve 2 and a bypass passage 23 in the first embodiment are provided. Instead, the configuration is the same as that of the first embodiment except that the configuration is an inverter-controlled pump 1a. Therefore, the description of the same configuration as that of the first embodiment will be omitted, and the different configuration and operation will be described. In the fifth embodiment, too, the flow rate is directly controlled by the pump 1a operated by the inverter controller 24, and the temperature data from the inlet temperature sensor 4 provided near the inlet 31 of the condenser 3, The temperature data from the outlet temperature sensor 5 provided in the vicinity of the outlet 32 is input to the arithmetic and control unit 22, calculated by the arithmetic and control unit 22b, and controlled by the inverter controller 24 to control the pump 1a. The feed flow rate L is controlled. The operation is almost the same as that of the first embodiment. However, when the operation temperature of the air conditioner is low and the temperature difference is small, the operation controller 22 controls the temperature of the condenser 3 at the peak load by monitoring the inlet / outlet water temperature difference ΔT. The inverter controller 24 and the pump 1a control the water amount L to be reduced so that the difference ΔT3 = T2−T1. Conversely, when the operation rate of the air conditioner increases and the load on the secondary side increases, the circulation amount of the refrigerant increases, so that the outlet water temperature T2 increases and the inlet / outlet water temperature difference ΔT increases. In order to approach the set value temperature difference ΔT3,
That is, the operation is performed so as to increase the water amount L so as to reduce the inlet / outlet water temperature difference ΔT. Therefore, even if the condenser 3 which is a plate heat exchanger is used, the water temperature difference ΔT on the primary side is monitored without monitoring the load fluctuation on the secondary side of the condenser 3,
By adjusting the amount of water L so that the value is constant,
Even if the load on the secondary side fluctuates, the refrigerant liquid is not retained in the heat exchanger 3, and the building air conditioning system can be operated.

[Embodiment 6] Next, a sixth embodiment of the present invention will be described with reference to FIG. 8. The difference from the fifth embodiment is a configuration in which the inlet temperature sensor 4 in the fifth embodiment is omitted. The other configuration is the same as that of the fifth embodiment. Therefore, the description of the same configuration as that of the sixth embodiment will be omitted, and the above-described different configuration and operation will be described. However, in the sixth embodiment, when the temperature of the cold water on the primary side is substantially constant in the building air conditioning system, In this case, a building air-conditioning system is constructed at a lower cost. In the sixth embodiment, a plate heat exchanger is used as the condenser 3. When the inlet water temperature on the primary side of the condenser 3 is almost constant, only the outlet water temperature is monitored, and the outlet water temperature is set to a predetermined value. By controlling only the amount of water L in the primary medium so that the load on the secondary heat quantity fluctuates, the building air conditioning system can be operated only by controlling the primary heat quantity. It is. In the case of the sixth embodiment, since the inlet water temperature is almost constant as in the case of the third and fourth embodiments, this value is input in advance to the arithmetic and control unit 22b, and the outlet water temperature T is detected by the outlet sensor. 5, the inlet / outlet water temperature difference ΔT on the primary side of the condenser 3 is detected, and the arithmetic and control unit 22b operates in the same manner as in the fifth embodiment. In the same manner as in the fifth embodiment, the water amount L is controlled by the inverter controller 24 and the pump 1a.
Control. Therefore, even in the sixth embodiment, even if the condenser 3 which is a plate-type heat exchanger is used, the primary-side water temperature difference ΔT can be obtained without monitoring the load fluctuation on the secondary side of the condenser 3.
Is monitored, and the amount of water L is adjusted so that the value becomes constant, so that the refrigerant liquid is not retained in the heat exchanger 3 even if the load on the secondary side fluctuates, and the building air conditioning system Operation becomes possible.

It is needless to say that the present invention is not limited to the above embodiment unless the characteristics of the present invention are impaired. For example, in each embodiment, the reference of the inlet / outlet water temperature difference or the outlet water temperature is set as the outlet water temperature difference or the water temperature at the time of the peak load of the secondary side which is known in advance, and the primary side water amount is controlled. The set value is not necessarily the inlet / outlet water temperature difference or the outlet water temperature at the time of the peak load on the secondary side, and it suffices that the condenser, which is a plate-type heat exchanger, is overcooled so that passage of the refrigerant is not hindered, The set value may be changed as appropriate.

[0018]

As described above, according to the first aspect of the present invention, a plate type heat exchanger is used as a condenser in a building air conditioning system in which the secondary side through which a refrigerant circulates is connected to a gravity type heat pipe. In addition to monitoring the difference in water temperature at the inlet and outlet on the primary side of the condenser, or monitoring the outlet water temperature when the inlet water temperature is constant, regardless of load fluctuation on the secondary side, Since it is a building air-conditioning system that controls the temperature difference or the outlet water temperature to a predetermined value, an inexpensive plate-type heat exchanger can be used as a condenser, which has the effect of being economically advantageous, and has the effect of operating. Since the control may be performed by monitoring the amount of water on the primary side, the configuration is simple, and an effect that maintenance is easy can be obtained. According to the second aspect of the present invention, since the control criterion in the configuration of the first aspect is the difference between the inlet and outlet water temperature or the outlet water temperature at the time of the peak load on the secondary side which is known in advance, In addition to the effect of item 1, an effect is obtained that the inhibition of refrigerant passage in the condenser can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically illustrating a conventional building air conditioning system using a gravity heat pipe.

FIG. 2 is an explanatory view schematically illustrating a first embodiment of a building air conditioning system using a condenser of a plate heat exchanger according to the present invention.

3 (a) is a perspective view of a condenser of a plate heat exchanger used in an embodiment of the present invention, and FIG. 3 (b) is an exploded perspective view of a conduction plate portion for heat exchange.

FIG. 4 is an explanatory view for explaining an outline of a second embodiment of the building air conditioning system using the condenser of the plate heat exchanger of the present invention.

FIG. 5 is an explanatory view illustrating an outline of a third embodiment of a building air conditioning system using a condenser of a plate heat exchanger according to the present invention.

FIG. 6 is an explanatory view schematically illustrating a fourth embodiment of a building air conditioning system using a condenser of a plate heat exchanger according to the present invention.

FIG. 7 is an explanatory view for explaining an outline of a fifth embodiment of the building air conditioning system using the condenser of the plate heat exchanger of the present invention.

FIG. 8 is an explanatory diagram illustrating an outline of a sixth embodiment of a building air-conditioning system using a condenser of a plate heat exchanger according to the present invention.

[Explanation of symbols]

 1, 1a Pump 2 Three-way valve 2a Two-way valve 21, 21a Drive mechanism 22, 22a, 22b Arithmetic controller 23 Bypass passage 24 Inverter controller 3 Condenser 31 Primary inlet 311,321 Water Flow hole 32 ... Primary side outlet 33 ... Secondary side inlet 331 ... Refrigerant gas flow hole 34 ... Primary side outlet 341 ... Refrigerant liquid flow hole 351,352 ... Frame 36,361,362 ... Conductive plate 37 ... Cooling water passage 38 ... Refrigerant passage 4 ... Inlet temperature Sensor 5 ... Outlet temperature sensor 6 ... Liquid receiver 7 ... Air conditioner 71 ... Expansion valve 72 ... Evaporator

Claims (2)

[Claims] In a building air conditioning system in which a refrigerant circulating on a secondary side is connected to a gravity heat pipe, a plate heat exchanger is used as a condenser, and a difference in water temperature between an inlet and an outlet on the primary side of the condenser is determined. Monitoring or, if the inlet water temperature is constant, monitoring the outlet water temperature, and controlling the outlet / outlet water temperature difference or the outlet water temperature to be a predetermined value regardless of the load fluctuation on the secondary side. And building air conditioning system. 2. A building air conditioning system in which a refrigerant circulating on a secondary side is connected to a gravity type heat pipe, a plate heat exchanger is used as a condenser, and a water temperature difference between an inlet and an outlet on the primary side of the condenser is reduced. Monitor or, if the inlet water temperature is constant, monitor the outlet water temperature, regardless of the fluctuation of the load on the secondary side, the outlet water temperature difference or the outlet water temperature, respectively, the secondary peak load known in advance A building air-conditioning system characterized by controlling the amount of water on the primary side such that the difference between the inlet / outlet water temperature at the time or the outlet water temperature is obtained.