JPH09236354A - Absorption type heat pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the realizing of delicate control of the degree of opening in accordance with change in evaporating temperature, by a method wherein the opening degree of an expansion valve is controlled in accordance with the detecting temperature of an evaporating temperature detecting means. SOLUTION: A control means 24 stores the relation of opening degree of a valve in accordance with the detecting temperature of a temperature detecting means 23 or a relation that the opening degree of the valve is reduced in accordance with the rise of the temperature, and supplies a rotation signal to a pulse motor so as to provide the opening degree of the valve compatible to a detecting temperature at every proper sampling times. In this case, a needle is operated in accordance with a given rotation signal and the opening degree of the valve is changed. The control means 24 controls the opening degree of an electronic control expansion valve 9 in accordance with the detecting temperature of the temperature detecting means 23, whereby the range of evaporating temperature of refrigerant can be kept within the optimum range and the stabilization of a refrigerant cycle can be contrived.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammonia absorption heat pump system using ammonia as a refrigerant and ammonia as an absorbent, and more particularly to a small-sized device for household use.

[0002]

2. Description of the Related Art Conventionally, this type of absorption heat pump is not for home use but for business use. As shown in the system diagram during cooling in FIG. 11, a generator and a rectifier are integrally formed. The generated / rectifier 50, the condenser 51 having a coolant passage on the primary side and the cooling water passage on the secondary side, and the condenser coolant passage 5
Refrigerant tank 52 provided at one outlet, and supercooler 53
An expansion valve 54, an evaporator 55 having a refrigerant channel on the primary side and a cold water channel on the secondary side, a solution heat exchanger 56, a pressure reducing valve 57, and a refrigerant channel on the primary side. An absorber 58 having a cooling water flow path on the secondary side, a concentrated solution tank 59 provided at the absorber refrigerant flow path outlet, a solution pump 60, a refrigerant circuit 61 connecting each component, and the condenser. And a cooling water circuit 62 formed by connecting the secondary cooling water flow paths of the absorber, and a cooling water circuit 63 including the secondary cooling water circuit of the evaporator. Generally, the portion surrounded by the alternate long and short dash line is incorporated in the outdoor unit.

In the above structure, during cooling, cold water in the cold water circuit 63 is used for the indoor radiator 65 by using the cold water circulation pump 64, and hot water in the cooling water circuit 62 is used for the outdoor unit radiator 67 using the hot water circulation pump 66. Circulate. Further, during heating, the cold water in the cold water circuit 63 is supplied to the outdoor radiator 67,
The warm water in the cooling water circuit 62 is circulated to the indoor unit radiator 65. Switching of the flow paths during cooling and heating is performed using, for example, a switching valve. The switching valve is omitted in FIG. 11.

The expansion valve used here is generally
It was replaced with a simple capillary tube, and its opening was fixed. Further, in the case of an electric compression type heat pump that uses Freon as the working medium, for example, as shown in FIG. 12, the refrigerant temperature at the outlet of the evaporator 68 is set in the valve 70 by the volume change of the liquid in the temperature sensitive tube 69. A mechanical automatic expansion valve 73 for operating the directly connected bellows 71 and the pressing rod 72, a pressure automatic expansion valve, and the like, which operate by converting temperature / pressure changes into mechanical energy, were used. .

[0005]

However, when a capillary tube is used as an expansion valve, the opening as a so-called expansion valve is constant, so the cooling / heating load (indoor Outside temperature, capacity, etc.)
It is not possible to perform detailed ability control corresponding to. The opening of the expansion valve is, of course, set to an opening that ensures the circulation amount of the refrigerant (refrigerant here means ammonia) that corresponds to the maximum capacity, but with a small cooling / heating load This is because it is necessary to change the opening.

Further, the expansion valve used in the electric compression type cannot be used as it is in the ammonia absorption heat pump. The latent heat of vaporization of ammonia is about 10 times that of chlorofluorocarbon, and a circulation amount of about 1/10 is sufficient if the same performance is obtained. Therefore, it is necessary to change the shape of the valve seat that receives the valve, and to finely control the valve opening.
This is because even a slight change in valve opening causes a large change in evaporation temperature in the case of ammonia, which adversely affects performance and operation.

[0007]

In order to solve the above problems, the present invention provides a regenerator, a rectifier, a condenser, an expansion valve,
A refrigerant circuit formed by pipe-connecting a primary side of an evaporator, an absorber, and a solution pump, a cold water circulation circuit formed on the secondary side of the evaporator, and a secondary side of the condenser. A hot water circulation circuit, an evaporation temperature detecting means for detecting the refrigerant temperature at the evaporator inlet, and a control means for controlling the opening degree of the electronically controlled expansion valve according to the temperature detected by the evaporation temperature detecting means. is there.

According to the present invention, since the opening degree of the expansion valve is controlled according to the temperature detected by the evaporation temperature detecting means, a fine opening degree control can be realized according to the change of the evaporation temperature.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The absorption heat pump of the present invention comprises:
A regenerator, a rectifier, a condenser, an expansion valve, a primary side of an evaporator, a refrigerant circuit in which an absorber and a solution pump are connected by piping, and a secondary side of the evaporator. A cold water circulation circuit, a hot water circulation circuit formed on the secondary side of the condenser, an evaporation temperature detecting means for detecting a refrigerant temperature at the evaporator inlet, and a temperature detected by the evaporation temperature detecting means. Since the opening of the expansion valve is controlled according to the temperature detected by the evaporation temperature detecting means, the electronically controlled expansion valve has a control means for controlling the opening degree of the expansion valve. Opening control can be realized.

Then, the control means sets the target value of the evaporation temperature and the electronically controlled expansion valve so that the temperature detected by the evaporation temperature detecting means matches the target value set by the target value setting means. With the configuration having the output setting means for outputting the electric signal, the target value of the evaporation temperature of the refrigerant can be set, and the opening degree of the electronically controlled expansion valve can be controlled so as to match the target value.

The absorption heat pump of the present invention is a refrigerant formed by connecting a regenerator, a rectifier, a condenser, an expansion valve, an evaporator primary side, an absorber and a solution pump through pipes. A circuit, a cold water circulation circuit formed on the secondary side of the evaporator, and a hot water circulation circuit formed on the secondary side of the condenser,
Evaporation temperature detecting means for detecting the refrigerant temperature at the evaporator inlet, cold water temperature detecting means for detecting the cold water temperature of the cold water circulation circuit, and the evaporating temperature detecting means and the cold water temperature detecting means according to the detected temperature It is configured to have a control means for controlling the opening degree of the electronically controlled expansion valve, and based on the temperatures detected by the evaporation temperature detecting means and the cold water temperature detecting means,
The opening of the electronically controlled expansion valve can be controlled by the control means.

The control means sets a target value setting means for setting a temperature lower than the detection temperature of the chilled water temperature detection means by a predetermined value as a target value, and the detection temperature of the evaporation temperature detection means of the target value setting means. By providing the output setting means for outputting an electric signal to the electronic expansion valve so as to match the set target value, the electronic expansion valve is opened so that the evaporation temperature becomes a temperature lower by a predetermined value than the chilled water temperature. You can control the degree.

The absorption heat pump of the present invention is a refrigerant formed by connecting a regenerator, a rectifier, a condenser, an expansion valve, a primary side of an evaporator, an absorber, and a solution pump by piping. A circuit, a cold water circulation circuit formed on the secondary side of the evaporator, and a hot water circulation circuit formed on the secondary side of the condenser,
Evaporation temperature detecting means for detecting the refrigerant temperature at the inlet of the evaporator, outside air temperature detecting means for detecting outside air temperature, and switching means for switching to perform indoor air conditioning by the hot water circulation circuit during heating and the cold water circulation circuit during cooling. In addition, during heating, there is provided a control means for controlling the opening degree of the electronically controlled expansion valve according to the temperatures detected by the evaporation temperature detecting means and the outside air temperature detecting means, and the outdoor temperature detecting means and the evaporation temperature detecting means are provided. The opening degree of the electronically controlled expansion valve can be controlled by the control means based on the detected temperature.

Further, the control means is a target value setting means for setting a temperature lower than the temperature detected by the outside air temperature detecting means by a predetermined value as a target value, and the detected temperature of the evaporation temperature detecting means is the target value setting means. By having a configuration having an output setting means for outputting an electric signal to the electronic expansion valve so as to match, the target value of the evaporation temperature is set based on the outdoor temperature, and the target value and the evaporation temperature are matched. The opening degree of the electronic expansion valve can be controlled.

Further, since the absorption heat pump of the present invention has a structure in which the evaporation temperature detecting means is assembled inside the housing of the expansion valve, it is easy to handle and the accurate evaporation temperature can be detected.

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) In FIG. 1, a gas circuit supplied from a gas solenoid valve 1 and a refrigerant circuit 4 in which a refrigerant heated by a burner 3 by air supplied from a burner fan 2 circulates is provided with a regenerator 5 and a rectifier. Vessel 6, primary side of condenser 7, primary side of subcooler 8, electronically controlled expansion valve 9, primary side of evaporator 10, secondary side of subcooler 8, primary side of absorber 11, solution The pump 12 and the solution heat exchanger 13 are constructed by sequentially connecting the primary sides of the pipes. In addition, in the path where the lower part of the rectifier 6, the secondary side of the solution heat exchanger 13, the pressure reducing valve 14, and the primary side of the absorber 11 are connected by piping, the refrigerant rarely separated from the refrigerant gas in the rectifier 6 is rare. A flow path for the solution is formed. The cold water circulation circuit 15 in which the cold water cooled by exchanging heat with the refrigerant in the evaporator 10 is circulated is
The secondary side of 0, the first circulation pump 16, and the indoor heat exchanger 18 including the indoor fan 17 are sequentially connected by piping. Furthermore, the hot water circulation circuit 19 in which the warm water that has exchanged heat with the refrigerant in the condenser 7 and circulates is circulated, and the secondary side of the condenser 7, the secondary side of the absorber 11, the second circulation pump 20, the outdoor heat radiation fan 21. It is configured by sequentially connecting the outdoor heat exchangers 22 each having a pipe. And the evaporator 10
An evaporating temperature detecting means 23 for detecting the evaporating temperature of the refrigerant is provided in the pipe at the inlet on the primary side. Reference numeral 24 is a control means, which controls the opening degree of the electronically controlled expansion valve 9 according to the temperature detected by the evaporation temperature detection means 23.

Next, the operation of the above configuration will be described.
First, the operation of the refrigerant circuit 4 will be described. The refrigerant vapor heated by the burner 3 is separated in the rectifier 6 into a highly pure refrigerant gas and a low concentration dilute refrigerant solution. The refrigerant gas generated from the rectifier 6 is sent to the primary side of the condenser 7, where it is heat-exchanged with water flowing through the circuit on the secondary side to be condensed and liquefied. The liquefied liquid refrigerant is cooled by the subcooler 8 and then passed through the electronically controlled expansion valve 9 to be decompressed and adiabatically expanded. The depressurized liquid refrigerant is sent to the primary side of the evaporator 10, where it is heat-exchanged with water passing through the secondary side to be evaporated and gasified. The gasified refrigerant is sent to the absorber 11 heated by the supercooler 8.

On the other hand, the dilute refrigerant solution generated in the rectifier 6 is cooled in the solution heat exchanger 13 and then reduced in pressure by passing through the pressure reducing valve 14 and sent to the primary side of the absorber 11. . On the primary side of the absorber 11, the refrigerant gas is absorbed by the refrigerant dilute solution and changes into a refrigerant concentrated solution having a higher concentration than the refrigerant dilute solution. The concentrated refrigerant solution is partially heated by the solution heat exchanger 13 by the solution pump 12 and then sent to the regenerator 5. Further, the solution pump 12 is configured to pump a part of the concentrated solution to the rectifier 6.

Next, the operation of the cold water circulation circuit 15 will be described. The chilled water that has exchanged heat with the refrigerant on the primary side of the evaporator 10 and is cooled is pressure-fed to the indoor heat exchanger 18 by the first circulation pump 16, where it exchanges heat with the indoor air to perform the cooling operation. Next, the operation of the hot water circulation circuit 19 will be described. 1 of condenser 7
The hot water heated by exchanging heat with the refrigerant on the secondary side and the refrigerant on the primary side of the absorber 11 is heated by the second circulation pump 20 in the outdoor heat exchanger 22.
Pumped to where it releases heat to the atmosphere.

Next, the operation of the electronically controlled expansion valve 9 will be described with reference to FIG. FIG. 2 is a sectional view of the electronically controlled expansion valve.
9a is a needle for controlling the opening of the narrowed portion 9b of the flow path, and 9
c is a pulse motor for moving the needle 9a in the vertical direction. The flow rate of ammonia flowing inside the electronically controlled expansion valve 9 is controlled by the needle 9a which moves up and down corresponding to the rotational force generated by the pulse motor 9c.

Next, the relationship between the opening degree of the electronically controlled expansion valve 9 and the evaporation temperature of the refrigerant will be described. Since the flow rate of the refrigerant flowing into the evaporator 10 is increased by increasing the opening degree of the electronically controlled expansion valve 9, the concentrated solution concentration at the outlet of the absorber 11 is decreased, and as a result, the evaporator 8 and the absorber 10 are reduced. The pressure of the low-pressure side line connecting the two rises. Therefore, as the pressure of the low-pressure side line increases, the evaporation temperature of the refrigerant increases.
On the contrary, if the opening degree of the electronically controlled expansion valve 9 is made small, the evaporation temperature of the refrigerant acts so as to decrease. In order to stabilize the refrigeration cycle, it is necessary to control the valve opening so that the evaporation temperature is set within an appropriate range. Therefore, when the evaporation temperature is too high, the valve opening is made small to decrease the evaporation temperature, and conversely, when the evaporation temperature is too low, the valve opening is made large and the evaporation temperature is increased. Just do it.

Therefore, in the control means 24, the relation of the valve opening degree according to the temperature detected by the evaporation temperature detection means 23, that is,
The relationship in which the valve opening degree is reduced as the temperature rises is stored, and a rotation signal is supplied to the pulse motor 9c so as to provide the valve opening degree corresponding to the temperature detected at every appropriate sampling time. The needle 9a operates according to the rotation signal given here, and the valve opening changes.

According to the above construction, the control means 24 controls the opening degree of the electronically controlled expansion valve 9 in accordance with the temperature detected by the evaporation temperature detection means 23, so that the evaporation temperature range of the refrigerant is kept within a proper range. It is possible to stabilize the refrigerant cycle.

(Embodiment 2) FIG. 3 is a block diagram of Embodiment 2 of the present invention. In FIG. 3, control means 24 different from the first embodiment
Will be described. Reference numeral 25 is a target value setting means, which sets a target value of the refrigerant temperature at the inlet of the evaporator 10. Reference numeral 26 is an output setting means for setting the valve opening degree of the electronically controlled expansion valve 9 so that the target value of the refrigerant temperature determined by the target value setting means and the temperature detected by the evaporation temperature detection means 23 match. That is,
The detected temperature Tj of the evaporation temperature detecting means 23 is read at every appropriate sampling time, and according to the temperature deviation ΔT = Ts−Tj from the target value Ts determined by the target value setting means 25,
The output is set by PI control, PID control, or the like. For example, when the PI control is used, as in the first embodiment, the valve opening may be made smaller when the evaporation temperature Tj rises. The relational expression with ΔT is as shown in Expression 1.

S = K1 + K2 × ΔT + K3 × ΣΔT (Equation 1) Here, K1, K2, and K3 are positive constants.

According to the above arrangement, the target value of the evaporation temperature is fixed. For example, during cooling operation, a system of keeping the cold water temperature at the outlet of the secondary side of the evaporator 10 at around 7 ° C is generally adopted, but in order to exchange heat with the cold water at 7 ° C,
The inlet temperature on the primary side of the evaporator 10 is lower than 3 to 4 ° C.
Must be kept back and forth. Therefore, if this temperature is set in the target value setting means 25 and a temperature deviation occurs,
The valve opening changes so that a constant temperature is always obtained.

(Third Embodiment) FIG. 4 shows an example of the electronically controlled expansion valve 7 used in the first and second embodiments. In FIG. 4, the evaporation temperature detecting means 23 is incorporated inside the electronically controlled expansion valve 9. In FIG. 4, the evaporation temperature detecting means 23 is in contact with the outlet side flow path inside the electronically controlled expansion valve 9, and the refrigerant temperature immediately after being subjected to the expansion action can be detected.

With the above arrangement, pressure loss and heat loss are extremely small, and more accurate temperature detection is possible. The electronically controlled expansion valve 9 may be used in each of the embodiments described below.

(Embodiment 4) FIG. 5 is different from Embodiment 1 in that the cold water circulation circuit 15 is provided with a cold water temperature detecting means 27 and the configuration of the control means 27. The cold water temperature detecting means 25 is provided on the pipe of the secondary outlet of the evaporator 10. The controller 24 controls the electronically controlled expansion valve 9 according to the temperatures detected by the evaporation temperature detector 23 and the cold water temperature detector 27.
Set the opening of. That is, the magnitude of the cold water load of the cold water circulation circuit 15 is estimated from the cold water temperature, and the opening degree of the electronically controlled expansion valve 9 is set in consideration of the load information. In order to exert the refrigerating capacity corresponding to the load, it is necessary to increase the refrigerant circulation amount as the load increases. Therefore, in order to obtain the same evaporation temperature, as the load increases,
It is necessary to increase the opening degree of the electronically controlled expansion valve 9. If the cold water temperature is high, it can be determined that the load is large. Therefore, when the cold water temperature is high and the evaporation temperature is low, the opening degree of the electronically controlled expansion valve 9 is large, and conversely, when the cold water temperature is low and the evaporation temperature is high, electronic control is performed. The opening degree of the expansion valve 9 may be small. Therefore, the control means 24 stores the opening degree of the electronically controlled expansion valve 9 corresponding to the combination of the detected temperature of the evaporation temperature detecting means 23 and the detected temperature of the cold water temperature detecting means 27, and reads it at every appropriate sampling time. However, the output corresponding to both temperatures is output to the electronically controlled expansion valve 9. FIG. 6 shows the relationship between the evaporation temperature and the electronically controlled expansion valve opening with the evaporation temperature Tj as a parameter. In FIG. 6, Te is the cold water temperature, and Te1 <
There is a relationship of Te2 <Te3.

According to the above construction, since the proper valve opening can be obtained in response to the change of the cold water temperature, the refrigerant cycle can be stabilized without being affected by the change of the cold water load.

(Fifth Embodiment) FIG. 7 is different from the fourth embodiment in the configuration of the control means 24. The target value setting means 25 uses the cold water temperature Te detected by the cold water temperature detecting means 27.
The temperature Ts = Te−T1 lower than the temperature T1 by T1 is set as the target value of the evaporation temperature. The output setting means 26 sets the valve opening degree of the electronically controlled expansion valve 8 so that the temperature detected by the evaporation temperature detecting means 23 matches the target value Ts. That is, the temperature deviation ΔT between the detected temperature Tj of the evaporation temperature detecting means 23 and the detected temperature of the cold water temperature detecting means 25 is read at every appropriate sampling time and the target value Ts determined by the target value setting means 25.
The output is set by PI control, PID control, etc. according to = Ts-Tj. For example, when the PI control is used, the control formula is expressed in the same form as the formula 1 described in the second embodiment.

According to the above arrangement, the target value of the evaporation temperature changes with the change of the cold water load. Therefore, when the chilled water load changes, the chilled water circulation circuit and the refrigerant circuit act to gradually follow the changes while maintaining the temperature balance between the chilled water circulation circuit and the refrigerant circuit, so that the refrigerant cycle can be stabilized.

(Embodiment 6) The difference from Embodiment 1 in FIG. 8 is that the first switching valve 29 and the second switching valve 30 are different.
With the operation of these switching valves, indoor air conditioning is performed by the secondary side circuit of the evaporator 10 during cooling, and indoor air conditioning is performed by the secondary side circuit of the condenser 8 during heating, thus enabling cooling and heating. The point is that the outdoor heat exchanger 22 is provided with the outside air temperature detection means 31, and the control means 24 is configured.

During the heating operation, the hot water obtained on the secondary side of the condenser 7 passes through the first switching valve 29 and the first circulation pump 16, and the indoor heat exchanger 18 exchanges heat with the indoor air to heat the room. It heats up and it passes through the 2nd switching valve 30 and the condenser 7
Return to. On the other hand, the cold water obtained on the secondary side of the evaporator 10 passes through the first switching valve 29 and the second circulation pump 20, and after exchanging heat with the outdoor air in the outdoor heat exchanger 22, the evaporator 10 is cooled.
Return to. During the heating operation, the outside air temperature needs to correspond to about −10 ° C. to 10 ° C., but in order to realize the heat pump operation, the evaporation temperature needs to be controlled over the range of about −20 ° C. to 0 ° C. That is, in order to perform a highly efficient heating operation commensurate with the outside air temperature, it is necessary to reduce the opening degree of the electronically controlled expansion valve and lower the evaporation temperature as the outside air temperature decreases. Therefore, when the outside air temperature is high and the evaporation temperature is low, the opening degree of the electronically controlled expansion valve 9 is large, and conversely, when the outside air temperature is low and the evaporation temperature is high, the opening degree of the electronically controlled expansion valve 9 may be small. . Therefore, the control means 24 stores the opening degree of the electronically controlled expansion valve 9 corresponding to the combination of the detected temperature of the evaporation temperature detecting means 23 and the detected temperature of the outside air temperature detecting means 31, and reads it at an appropriate sampling time. However, the output corresponding to both temperatures is output to the electronically controlled expansion valve 9. FIG. 9 shows the relationship between the evaporation temperature and the electronically controlled expansion valve opening with the outside air temperature To as a parameter. FIG.
Then, To is the outside temperature, and there is a relationship of To1 <To2 <To3.

According to the above construction, since the proper valve opening can be obtained in response to the change in the outside air temperature during the heating operation, a highly efficient heat pump operation can be performed.

(Embodiment 7) In FIG. 10, what is different from Embodiment 6 is the configuration of the control means 24. The target value setting means 25 sets a temperature Ts = Te−Ta lower than the outside air temperature To detected by the outside air temperature means 31 by Ta as a target value of the evaporation temperature. The output setting means 26 is the evaporation temperature detecting means 23.
The valve opening degree of the electronically controlled expansion valve 9 is set so that the detected temperature of 1 becomes equal to the target value Ts. That is, the temperature deviation ΔT = Ts−To between the temperature Tj detected by the evaporation temperature detecting means 23 and the temperature detected by the outside air temperature detecting means 25 is read at every appropriate sampling time and the target value Ts determined by the target value setting means 25.
According to the above, the output is set by PI control, PID control, or the like. For example, when the PI control is used, the control formula is expressed in the same form as the formula 1 described in the second embodiment.

According to the above construction, since the proper valve opening can be obtained in response to the change in the outside air temperature during the heating operation, it is possible to operate the heat pump with high efficiency.

[0038]

As described above, in the absorption heat pump of the present invention, the opening degree of the electronically controlled expansion valve is controlled according to the temperature detected by the evaporation temperature detecting means, so that fine control can be realized. The effect is that you can do it.

Since the evaporation temperature changes according to the cold water temperature, stable operation can be realized even when the load changes.

Further, during the heating operation, the evaporation temperature changes in accordance with the change in the outside air temperature, so that it is possible to operate the heat pump with high efficiency in response to a wide range of temperature changes.

Further, since the evaporation temperature detecting means is provided inside the housing of the electronically controlled expansion valve, the evaporation temperature can be controlled more accurately.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an absorption heat pump according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an electronically controlled expansion valve according to the first embodiment.

FIG. 3 is a configuration diagram of an absorption heat pump according to a second embodiment of the present invention.

FIG. 4 is a sectional view of an electronically controlled expansion valve according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of an absorption heat pump according to a fourth embodiment of the present invention.

FIG. 6 is a relational diagram of the temperature detection means and the opening degree of the electronically controlled expansion valve in the fourth embodiment.

FIG. 7 is a configuration diagram of an absorption heat pump according to a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of an absorption heat pump according to a sixth embodiment of the present invention.

FIG. 9 is a relationship diagram between the temperature detection means and the opening degree of the electronically controlled expansion valve in the sixth embodiment.

FIG. 10 is a configuration diagram of an absorption heat pump according to a seventh embodiment of the present invention.

FIG. 11 is a configuration diagram showing a conventional absorption heat pump.

FIG. 12 is a sectional view showing a conventional expansion valve.

[Explanation of symbols]

 4 Refrigerant circuit 5 Regenerator 6 Rectifier 7 Condenser 9 Electronically controlled expansion valve 10 Evaporator 11 Absorber 12 Solution pump 15 Cold water circulation circuit 19 Hot water circulation circuit 23 Evaporation temperature detection means 24 Control means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masamitsu Kondo 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takashi Sawada 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A refrigerant circuit comprising a regenerator, a rectifier, a condenser, an expansion valve, a primary side of an evaporator, an absorber, and a solution pump connected by piping, and the evaporator. A cold water circulation circuit formed on the secondary side, a hot water circulation circuit formed on the secondary side of the condenser, an evaporation temperature detecting means for detecting the refrigerant temperature at the evaporator inlet, and an evaporation temperature detecting means. An absorption heat pump having control means for controlling the opening of the electronically controlled expansion valve according to the detected temperature. 2. The control means comprises a target value setting means for setting a target value of the evaporation temperature, and the electronically controlled expansion valve so that the temperature detected by the evaporation temperature detecting means coincides with the target value set by the target value setting means. The absorption heat pump according to claim 1, further comprising an output setting unit configured to output an electric signal. 3. A refrigerant circuit comprising a regenerator, a rectifier, a condenser, an expansion valve, a primary side of an evaporator, an absorber, and a solution pump connected in a pipe, and the evaporator. Cold water circulation circuit formed on the secondary side, hot water circulation circuit formed on the secondary side of the condenser, evaporation temperature detection means for detecting the refrigerant temperature of the evaporator inlet, cold water of the cold water circulation circuit An absorption heat pump comprising: a chilled water temperature detecting means for detecting a temperature; and a control means for controlling an opening degree of the electronically controlled expansion valve according to detected temperatures of the evaporation temperature detecting means and the chilled water temperature detecting means. 4. The control means sets a target value setting means for setting a temperature lower than the detection temperature of the cold water temperature detection means by a predetermined value as a target value, and the detection temperature of the evaporation temperature detection means is set to the target value setting means. 4. The absorption heat pump according to claim 3, further comprising output setting means for outputting an electric signal to the electronic expansion valve so as to match the set target value. 5. A refrigerant circuit in which a regenerator, a rectifier, a condenser, an expansion valve, a primary side of an evaporator, an absorber, and a solution pump are connected by piping, and the evaporator. A cold water circulation circuit formed on the secondary side, a hot water circulation circuit formed on the secondary side of the condenser, evaporation temperature detection means for detecting the refrigerant temperature at the evaporator inlet, and an outside for detecting the outside air temperature. An air temperature detecting means, a switching means for switching to perform indoor air conditioning by the hot water circulation circuit during heating, and a chilled water circulation circuit during cooling, and during heating, depending on the temperatures detected by the evaporation temperature detecting means and the outside air temperature detecting means. An absorption heat pump having a control means for controlling the opening degree of an electronically controlled expansion valve. 6. The control means comprises a target value setting means for setting a temperature lower than the temperature detected by the outside air temperature detecting means by a predetermined value as a target value, and the temperature detected by the evaporation temperature detecting means is the target value setting means. The absorption heat pump according to claim 5, further comprising output setting means for outputting an electric signal to the electronic expansion valves so as to coincide with each other. 7. The absorption heat pump according to claim 1, wherein the expansion valve has an evaporation temperature detecting means incorporated inside the housing.