JPH10232064A - Cooling operation control method of absorption cooling and heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To level the supplying amount of liquid refrigerant to the side of an indoor machine by a method wherein the liquid refrigerant is bypassed from the liquid side of an evaporator to the side of a liquid refrigerant pipe when the sending-out of the liquid refrigerant, sent from the liquid side of the evaporator to the side of the liquid refrigerant pipe, supplying the liquid refrigerant of secondary side refrigerant, is stopped. SOLUTION: A room heating valve 23, provided on the way of a flow passage 22, is opened when the amount of secondary side liquid refrigerant 30 is smaller than a predetermined staying amount and the sending-out of the liquid refrigerant 30, sent from the liquid side 5 of an evaporator to the side of a liquid refrigerant pipe 19, is stopped. According to this operation, the liquid refrigerant 30 can be sent by both of the liquid heads of the flow passage 22 and other flow passages (suction flow passage 11 and discharging flow passage 12), which have sent out the liquid refrigerant till now, and further, the width of the flow passage is increased whereby the supplying amount of the liquid refrigerant 30 is increased. However, the increased amount is not larger than the supplying amount of a booster 10 whereby the liquid refrigerant is reserved in a receiver tank 14 gradually and the supplying amount of liquid refrigerant 30 into the indoor machine is leveled thereby not reducing the supplying amount of liquid refrigerant remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a cooling operation of an absorption type cooling and heating apparatus, and more particularly to a method for controlling a supply of a secondary refrigerant to an indoor unit.

[0002]

2. Description of the Related Art FIG. 4 is a system diagram showing a secondary side circulation circuit provided in an absorption type air conditioner. In the secondary side circulation circuit 2, during the cooling operation, the refrigerant gas pipe 18
The refrigerant gas 29 is introduced into the evaporator coil 4 of the evaporator through cooling, and is cooled and condensed to become a liquid refrigerant 30,
It is led to. A float switch 15 is provided in the receiver tank 14 connected to the suction pipe 11, and when the liquid accumulates in the receiver tank 14, the float switch 15 is activated and a liquid level signal is input to the controller 25, and the liquid is supplied to the controller 25. A start signal is sent to a certain booster 10, and the booster 10 is started (ON), and the liquid refrigerant is pressure-fed from the discharge pipe 12 to the liquid refrigerant pipe 19. At this time, the heating valve 23 is closed and does not bypass to the suction line 11.

[0003] During the heating operation, the booster 10 stops,
The heating valve 23 opens. During the heating operation, the flow direction of the secondary-side refrigerant is reversed, the liquid refrigerant 30 is guided from the liquid refrigerant pipe 19, is heated by the evaporator coil 4 via the heating valve 23, and becomes the refrigerant gas 29, and becomes the refrigerant gas pipe 18. And is supplied to the indoor unit. Note that reference numeral 8 denotes an absorption-type cooling / heating device, and reference numeral 22 denotes a flow path.

FIG. 5 is a system diagram of a cooling operation control method for an absorption type air conditioner according to the prior art. First, a judgment 101 of cooling or heating is made by a start command 100. In the case of the cooling operation, the heating valve is closed by the heating valve closing 102. In the heating operation in the judgment 101 of cooling or heating, the heating valve is opened by the heating valve opening 106 and the booster is turned off.
At 107, the booster is stopped.

Next, when the heating valve is closed, a predetermined retention amount m is determined in a determination 103 of the float switch liquid level.
₀ (or a predetermined height h ₀ ) or more, booster ON1
At 04, the booster is activated, and the process returns to before the determination 103 of the float switch liquid level. On the other hand, if it is determined in the float switch liquid level determination 103 that the amount is less than the predetermined retention amount m ₀ (or the predetermined height h ₀ ), the booster is stopped by the booster OFF 105, and before the float switch liquid level determination 103. Return.

[0006]

However, when the booster 10 is activated (ON) and the liquid refrigerant is pressure-fed from the discharge line 12 to the liquid refrigerant tube 19, the amount of liquid in the receiver tank 14 decreases, and the float switch 15 Detects a predetermined retention amount m ₀ of the liquid refrigerant set in advance, and the booster 10 stops. However, at this time, the supply amount of the liquid refrigerant suddenly decreases, and the supply amount to the secondary-side indoor unit is reduced, so that the output of the indoor unit is drastically reduced to cause discomfort in the room.

FIG. 6 is a diagram showing the relationship between the time and the supply amount of the liquid refrigerant according to the cooling operation control method shown in FIG. As shown in FIG. 6, when the conventional control the booster 10 is activated, during a period _{t 10 1 ~t 102, t 103} ~t 104, t 105 ~t 106 is stably supplying liquid refrigerant, section t ₁₀₀ ~t _101, t ₁₀₂ ~
Between t _103, t ₁₀₄ ~t ₁₀₅ decreases the liquid refrigerant supply amount V _100, decreases rapidly, it is difficult to supply a sufficient stable beneath liquid refrigerant to the indoor unit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling operation control method for an absorption type air conditioner which forms a primary side circulation circuit of a refrigerant and an absorbing solution and heats or cools a secondary side refrigerant for cooling and heating. When the delivery of the secondary liquid refrigerant sent from the liquid side to the liquid refrigerant pipe side is stopped, the supply amount of the liquid refrigerant to the indoor unit is leveled without increasing the cost, and the indoor comfortable environment is maintained. is there.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention connects a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber and the like to a primary circulation circuit of a refrigerant and an absorbing solution. In the cooling operation control method of the absorption type air conditioner for heating or cooling the secondary side refrigerant for cooling and heating, the liquid refrigerant pipe for supplying the liquid refrigerant of the secondary side refrigerant from the liquid side of the evaporator When the delivery of the liquid refrigerant sent to the side is stopped, the liquid refrigerant is bypassed from the liquid side of the evaporator to the liquid refrigerant pipe side.

[0010] By bypassing the liquid refrigerant, when the supply of the liquid refrigerant sent from the liquid side of the evaporator to the liquid refrigerant pipe side is stopped, both the flow of the bypass and the flow of the flow path that has been sent up are stopped. It can be sent by the liquid head pressure, leveling the supply of liquid refrigerant to the indoor unit, and maintaining a comfortable indoor environment.

Further, in the method for controlling the cooling operation of the absorption type cooling and heating apparatus, the bypass is a flow path from the liquid refrigerant pipe side to the liquid side of the evaporator during the heating operation,
This is done by opening a heating valve provided in the middle of the flow path. By opening the heating valve provided in the middle of the flow path from the liquid refrigerant pipe side to the liquid side of the evaporator during the heating operation, in addition to the operation of the cooling operation control method of the absorption type cooling and heating device, a new bypass is performed. And the supply amount of the liquid refrigerant to the indoor unit can be equalized. And, in any one of the above-described cooling operation control methods of the absorption-type cooling and heating device, when the secondary liquid refrigerant is smaller than a predetermined retention amount,
It is another object of the present invention to perform a cooling operation control method for any of the absorption-type cooling and heating devices. By performing the cooling operation control method of any one of the above-mentioned absorption cooling and heating devices when the secondary side liquid refrigerant is less than the predetermined retention amount, in addition to the operation of the cooling operation control method of any one of the above-mentioned absorption cooling and heating devices, Since the amount of the liquid refrigerant flowing from the evaporator is larger than the amount of the liquid refrigerant supplied to the refrigerant pipe, the liquid refrigerant gradually accumulates, and the stable supply of the liquid refrigerant can be performed again when the liquid refrigerant reaches a predetermined retention amount.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an absorption type cooling and heating apparatus according to the present invention will be described below with reference to the drawings.

FIG. 3 is a system diagram of the entire circuit of the absorption type air conditioner. The absorption-type cooling and heating device 1 includes a cooling water pipe 80.
a, a cooling tower 81 having a fan 82 that cools cooling water and is connected by 80b, and is connected to the absorption type cooling and heating apparatus 1 by a refrigerant gas pipe 18 and a liquid refrigerant pipe 19, is disposed in a space to be air-conditioned, and And an air-conditioning indoor unit (not shown) for exchanging heat. The cooling water pipe 80b is provided with a cooling water circulating pump 73 for circulating cooling water from the cooling tower 81 to the absorption type cooling and heating apparatus 1, and further provided with a secondary liquid refrigerant pipe 19, and a refrigerant gas pipe 18 and A secondary refrigerant circulation pump (not shown) for circulating the secondary refrigerant in the liquid refrigerant pipe 19 between the absorption cooling / heating device 1 and the indoor unit for air conditioning is provided.

In contrast to the indoor unit for air conditioning, the absorption type cooling and heating apparatus 1 usually called an outdoor unit together with the cooling tower 81 is a heating source in which fuel is burned by a burner and a dilute solution is heated by the combustion heat. High-temperature regenerator 4 having 47
6, a separator 49 for separating the refrigerant vapor and the intermediate concentrated solution from the dilute solution heated by the high-temperature regenerator 46, and heating the intermediate concentrated solution using the separated refrigerant vapor as a heat source to generate further refrigerant vapor. A low-temperature regenerator 50 for cooling, a condenser 51 for cooling, condensing, and liquefying the refrigerant vapor generated by the low-temperature regenerator 50 and the refrigerant vapor passing through the low-temperature regenerator 50 to generate a liquid refrigerant. From the refrigerant distributor 54 containing the generated liquid refrigerant to the evaporating coil 4
An evaporator 53 is provided for dropping and evaporating the evaporator on the top and cooling the secondary refrigerant in the evaporating coil 4.

Further, the absorption type cooling and heating apparatus 1 comprises an absorber 52 for absorbing the refrigerant vapor evaporated in the evaporator 53 into a concentrated solution to generate a dilute solution, a pressurizing the dilute solution to a low-temperature solution heat exchanger 57, A solution circulating pump 60 that feeds the high-temperature solution heat exchanger 56 to the high-temperature regenerator 46 via the heated fluid side; and a pipe line 62 that connects the bottom of the separator 49 and the bottom of the evaporator 53 via a cooling / heating switching valve 61. , A concentrated solution pipe 58 connecting the heated fluid outlet side of the low temperature solution heat exchanger 57 to the upper part of the absorber 52.
A conduit 71 connecting the concentrated solution pipe 58 and the lower part of the absorber 52 via a solution bypass valve 70; and a refrigerant distributor 54 provided in the concentrated solution pipe 58 and the evaporator 53 by connecting the antifreeze valve 6
7, a water refrigerant pipe 66 for guiding the liquid refrigerant from the condenser 51 to the refrigerant distributor 54, and a pipe connected in parallel to the water refrigerant pipe 66 and having a water refrigerant proportional valve 64 interposed therebetween. And a path 65.

Then, the intermediate concentrated solution separated by the separator 49 is led to the low temperature regenerator 50 via the heated fluid side of the high temperature solution heat exchanger 56, and the low temperature regenerator 50 evaporates the refrigerant to form a concentrated solution. After that, the conduit is configured to be guided to the concentrated solution pipe 58 via the heated fluid side of the low temperature solution heat exchanger 57. Each of the absorber 52 and the condenser 51 is provided with a cooling water coil, and the outlet of the cooling water coil of the absorber 52 is connected to the inlet of the cooling water coil of the condenser 51.
The inlet of the cooling water coil of the absorber 52 is connected to the cooling water pipe 80b,
The outlet of the cooling water coil of the condenser 51 is connected to the cooling water pipe 80a,
Each is connected. The liquid refrigerant pipe 19 of the secondary refrigerant is connected to the liquid side of the evaporation coil 4, and the refrigerant gas pipe 18 of the secondary refrigerant is connected to the gas side of the evaporation coil 4.

In the apparatus having the above structure, the cooling / heating switching valve 61
Switches between cooling and heating, and is closed during cooling and opened during heating. The water refrigerant proportional valve 64 is a valve whose opening degree is controlled with the temperature of the evaporator 53 (output of the evaporator temperature sensor) as input, and which adjusts the solution concentration. The anti-freezing valve 67 opens when the evaporation temperature decreases to 1 ° C. to allow the concentrated solution to flow into the refrigerant distributor 54, and the refrigerant (usually water is used as the refrigerant of the absorption type cooling and heating device. This is a valve that prevents freezing of the refrigerant. The solution bypass valve 70 is
When the evaporator temperature decreases at the start of cooling and during low-load operation, the concentrated solution is bypassed to the lower part of the absorber 52 before the anti-freeze valve 67 is operated, so that the absorption capacity of the absorber 52 is reduced. 53 is an on-off control valve for preventing the temperature from further dropping.

In FIG. 3, the secondary circuit 2 has been described with reference to FIG.
Has a booster 10 which is a liquid refrigerant transport device or a liquid refrigerant return means for returning the liquid refrigerant 30 condensed by the evaporator 53 of FIG. 3 to the liquid refrigerant pipe 19 and supplying it again to the indoor unit.

In the cooling type air-conditioning apparatus 1 having the above configuration, the cooling operation control method according to the present embodiment employs a liquid refrigerant for supplying the secondary liquid refrigerant 30 from the liquid side 5 of the evaporator as shown in FIG. The delivery of the liquid refrigerant 30 sent to the pipe 19 side is stopped by stopping the booster 10, and when the secondary liquid refrigerant 30 is smaller than a predetermined retention amount (m ₀ ), the liquid side 5 of the evaporator and the liquid refrigerant pipe are connected. This is to open a heating valve 23 provided between the liquid refrigerant pipe 19 and the liquid side 5 of the evaporator during the heating operation.

FIG. 1 is a system diagram showing the cooling operation control method in a diagram. First, a determination 34 of cooling or heating is made by a start command 33. In the case of the cooling operation, the heating valve is closed by the heating valve closing 35. In the case of the heating operation in the judgment 34 of the cooling or the heating, the heating valve is opened by opening the heating valve 40 and the booster is stopped by the booster OFF 41.

Next, when the heating valve is closed, the process proceeds to the determination 36 of the float switch liquid level, and the determination 36 of the float switch liquid level indicates that the amount of the retained liquid m ₀ (or the predetermined height h ₀ ) or more is exceeded. In this case, the booster is activated by the booster ON 37, and the process returns to before the heating valve closes 35. On the other hand, in the determination 36 of the float switch liquid level, the predetermined retention amount m ₀
(Or less than the predetermined height h ₀ )
The booster is stopped at F38, and the heating valve is opened at the heating valve opening 39 to return to before the determination 36 of the float switch liquid level.

The above-mentioned cooling operation control method comprises the steps of:
0 is less than a predetermined retention amount (m ₀ ), and when the delivery of the liquid refrigerant 30 sent from the liquid side 5 of the evaporator to the liquid refrigerant pipe 19 is stopped, a heating valve provided in the middle of the flow path 22 By opening 23, the inside of the booster with the narrow flow path (the booster itself is stopped but the liquid refrigerant 30 can pass through the inside) can be conventionally sent to the liquid refrigerant pipe 19 only with the liquid head pressure. However, in the present embodiment, the flow path 2
2 and the flow path (the suction pipe 11 and the discharge pipe 12) which have been sent out so far can be sent by the liquid head pressure, and since the flow path becomes wider, the supply amount of the liquid refrigerant also increases. However, since the supply amount of the booster 10 is not as large as that of the booster 10, the liquid gradually accumulates in the receiver tank 14, and the supply amount of the liquid refrigerant 30 to the indoor unit is leveled, and the indoor supply amount is not reduced without greatly reducing the supply amount of the liquid refrigerant. Maintain a comfortable environment.

Further, the supply amount of the liquid refrigerant to the indoor unit can be equalized without increasing the cost without newly providing a bypass flow path and causing a bypass. When the secondary liquid refrigerant 30 is smaller than the predetermined amount (m ₀ ), the amount of the liquid refrigerant flowing from the evaporator coil 4 is larger than the amount of the liquid refrigerant supplied to the liquid refrigerant pipe 19. When the pool reaches a predetermined retention amount (m ₀ ), a sufficient and stable supply of the liquid refrigerant can be performed again. At this time, the heating valve 23 is closed again, and the bypass of the liquid refrigerant to the suction pipe line 11 is prevented.

FIG. 2 is a diagram showing the relationship between the time and the supply amount of the liquid refrigerant according to the cooling operation control method shown in FIG. As can be seen from this figure, the supply amount per time itself does not change, but the interval t
_{0 to} t ₁ , t _{2 to} t ₃ , and t _{4 to} t ₅ , the liquid refrigerant supply amount V
₁ (supply amount per unit time) is larger than the liquid refrigerant supply amount V ₁₀₀ shown in FIG. 6, and the supply amount is leveled.
The amount of refrigerant supplied to the next indoor unit is stabilized, and indoor comfort is maintained.

Although the cooling operation control method according to the above embodiment has been described as applied to a water-cooled absorption-type cooling and heating device, the present invention is not limited to this, and may be applied to an air-cooled absorption-type cooling and heating device. Of course, it can be applied. Further, as a heating source of the high-temperature regenerator, in addition to combustion heating by a burner, heating by exhaust steam or waste water, heating by an electric heater, or the like can be used. Further, the refrigerant on the secondary side uses chlorofluorocarbon (HFC-134a) that changes phase, but other than this, alcohol, a mixture of water and a latent heat agent, and the like can be used.

[0026]

According to the cooling operation control method of the absorption type air conditioner of the present invention, when the supply of the secondary side liquid refrigerant sent from the liquid side of the evaporator to the liquid refrigerant pipe side is stopped, the indoor unit side is stopped. Can be leveled without increasing the cost of the liquid refrigerant, and a comfortable indoor environment can be maintained.

[Brief description of the drawings]

FIG. 1 is a system diagram showing, in a diagram, one embodiment of a cooling operation control method for an absorption type air conditioner according to the present invention.

FIG. 2 is a diagram illustrating a relationship between a time and a liquid refrigerant supply amount according to the cooling operation control method of FIG. 1;

FIG. 3 is a system diagram of an overall circuit of the absorption-type cooling and heating apparatus.

FIG. 4 is a system diagram showing a secondary-side circulation circuit provided in the absorption-type cooling and heating apparatus of FIG. 3;

FIG. 5 is a system diagram of a cooling operation control method for an absorption type air conditioner according to the related art.

FIG. 6 is a diagram illustrating a relationship between time and a liquid refrigerant supply amount according to the cooling operation control method of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Absorption type air-conditioning apparatus 5 Liquid side 10 Booster 19 Liquid refrigerant pipe 22 Flow path (bypass flow path) 23 Heating valve 28 Secondary refrigerant 30 Secondary liquid refrigerant 44 Primary circulation circuit 53 Evaporator m ₀ Predetermined residence amount

Continued on the front page (72) Inventor Noboru Kobayashi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Kazuya Imai 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. Osaka Gas Co., Ltd.

Claims (3)

[Claims] 1. A high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber and the like are connected to form a primary circulation circuit of a refrigerant and an absorbing solution, and heating of a secondary refrigerant for cooling and heating. Or in the cooling operation control method of the absorption type air conditioner that performs cooling, when stopping the delivery of the liquid refrigerant sent from the liquid side of the evaporator to the liquid refrigerant pipe side supplying the liquid refrigerant of the secondary side refrigerant, A cooling operation control method for an absorption type cooling / heating device, wherein a liquid refrigerant is bypassed from a liquid side of the evaporator to a side of the liquid refrigerant pipe. 2. The air conditioner according to claim 1, wherein the bypass is a flow path from the liquid refrigerant pipe side to the liquid side of the evaporator during a heating operation, and opens a heating valve provided in the middle of the flow path. A cooling operation control method for an absorption type air conditioner. 3. The method according to claim 1, wherein when the amount of the secondary liquid refrigerant is smaller than a predetermined amount, the cooling operation control method for the absorption type air conditioner according to claim 1 or 2 is performed. Method for controlling the cooling operation of an absorption-type cooling and heating apparatus.