JP2898202B2 - Absorption cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption type cooling apparatus capable of performing a cooling operation by an absorption type refrigeration cycle.

[0002]

2. Description of the Related Art The basic structure of an absorption refrigeration cycle is as follows.
A regenerator that heats the absorbing liquid and vaporizes a part of the absorbing liquid,
A condenser that cools and liquefies the vaporized refrigerant generated in the regenerator, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, and absorbs the vaporized refrigerant evaporated by the evaporator into an absorbing liquid. The absorbing liquid, which includes an absorber and absorbs the vaporized refrigerant by the absorber, is sent to a regenerator by a solution pump. Then, when the refrigerant evaporates in the evaporator, latent heat is taken from a heat medium (such as water) sent from the evaporator to the indoor heat exchanger. The heat medium that has been deprived of heat and cooled is sent to the indoor heat exchanger and exchanges heat with the indoor air to cool the room. On the other hand, the condenser and the absorber are supplied with cooling water that cools and liquefies the vaporized refrigerant or cools the sprayed absorbing liquid to promote the refrigerant absorbing capacity. The cooling water generally circulates through a circulation path, is cooled by cooling means provided in the middle of the circulation path, and is then supplied to a condenser and an absorber. Then, the cooling means is adjusted so that the temperature of the cooling water supplied to the condenser and the absorber becomes a constant temperature.

[0003]

The capacity of the cooling means is set so as to satisfy the cooling capacity even when the temperature of the cooling water is adjusted to a constant temperature, when the outside air temperature is high, or when the cooling load is large. . For this reason, when the outside air temperature is low,
When the cooling load is small, excess capacity is generated in the cooling means. On the other hand, the absorption-type cooling device includes a heating unit that heats the absorption liquid with a regenerator. Since the energy consumed by the absorption cooling device is mainly consumed by the heating unit, it is desired to suppress the energy consumed by the heating unit.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an absorption type cooling apparatus capable of increasing cooling efficiency and suppressing energy consumed in a heating section.

[0005]

Means for Solving the Problems In order to achieve the above object, the absorption cooling apparatus of the present invention employs the following technical means. [Means of claim 1] An absorption type cooling device has a heating section for heating the absorption liquid, a regenerator for heating the absorption liquid in the heating section to vaporize a refrigerant contained in the absorption liquid, and a regenerator generated in the regenerator. Condenser that cools and liquefies the vaporized refrigerant that has been evaporated, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, and an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbent. A refrigeration cycle, a cooling water circuit for circulating cooling water for cooling the refrigerant in the condenser while cooling the absorbing liquid in the absorber, and cooling provided in the cooling water circuit for cooling the cooling water by outdoor air. Means, and when the liquefied refrigerant evaporates in the evaporator, the latent heat of evaporation is taken away, and the cooled heat medium is guided to an indoor heat exchanger installed in the room, thereby performing a cooling operation for cooling the room. Do.

[0006] The absorption-type cooling apparatus includes an outside air temperature detecting means for detecting an outdoor temperature. When the temperature detected by the outside air temperature detecting means is high, the air is supplied to the absorber and the condenser. The cooling means is adjusted so that the temperature of the cooling water becomes a predetermined temperature, and when the temperature detected by the outside air temperature detecting means is low, the temperature of the cooling water supplied to the absorber and the condenser is reduced Cooling water temperature adjusting means for adjusting the cooling means so as to have a temperature lower than a predetermined temperature;

A second aspect of the present invention provides an absorption type cooling apparatus, comprising: a heating section for heating the absorbing liquid; a regenerator for heating the absorbing liquid in the heating section to vaporize a refrigerant contained in the absorbing liquid; A condenser that cools and liquefies the vaporized refrigerant generated in the condenser, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, and an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbent. An absorption type refrigeration cycle, a cooling water circuit for circulating cooling water for cooling the refrigerant in the condenser while cooling the absorption liquid in the absorber, and a cooling water circuit provided in the cooling water circuit. Cooling means for cooling, and cooling the room by guiding the heat medium, which is deprived of latent heat of evaporation when the liquefied refrigerant evaporates in the evaporator, to the indoor heat exchanger installed in the room, Cooling operation Cormorant.

[0008] The absorption-type cooling apparatus includes cooling load detecting means for detecting a cooling load in the room by the indoor heat exchanger. When the cooling load detected by the cooling load detecting means is large, the absorption cooling apparatus includes the cooling load detecting means. The cooling means is adjusted so that the temperature of the cooling water supplied to the heat sink and the condenser becomes a predetermined temperature, and when the cooling load detected by the cooling load detecting means is small, the cooling water is supplied to the absorber and the condenser. Cooling water temperature adjusting means for adjusting the cooling means so that the temperature of the supplied cooling water is lower than the predetermined temperature;

[0009]

[Action and effect of the invention]

In the cooling operation, when the outdoor temperature is high, the cooling capacity of the cooling means in the cooling means decreases. At this time, the temperature detected by the outside air temperature detecting means is also high. In this case, the cooling water temperature adjusting means adjusts the cooling means so that the temperature of the cooling water supplied to the absorber and the condenser becomes a predetermined temperature.

On the contrary, when the outdoor temperature is low during the cooling operation, the cooling capacity of the cooling water in the cooling means is improved. At this time, the temperature detected by the outside air temperature detecting means is also low. In this case, the cooling water temperature adjusting means adjusts the cooling means such that the temperature of the cooling water supplied to the absorber and the condenser becomes lower than a predetermined temperature. When the temperature of the cooling water supplied to the absorber and the condenser decreases, the ability of the absorber to absorb the vaporized refrigerant into the absorbing liquid increases, and the temperature of the absorber decreases, and the temperature of the evaporator also decreases. In addition, the pressure in the evaporator is kept low, the boiling point is kept low, and the ability to vaporize the refrigerant is increased. In addition, the ability of the condenser to cool and liquefy the vaporized refrigerant also increases. In this way, the efficiency of the absorption refrigeration cycle is improved by increasing the absorption capacity of the absorber and the liquefaction capacity of the refrigerant in the condenser, and increasing the vaporization capacity of the refrigerant in the evaporator.
As a result, the heating capacity of the heating unit that heats the absorbing liquid can be suppressed.

According to the absorption cooling apparatus of the present invention, as described above, when the outdoor temperature is low, the heating capacity of the absorbing liquid by the heating section can be suppressed low. Energy consumption can be reduced. That is,
When the temperature of the outdoor air is low, even if the indoor cooling load is constant, the energy consumption of the absorption cooling device can be suppressed.

When the cooling load is large during the cooling operation, a large cooling capacity is required for the cooling means. That is, the surplus capacity of the cooling means is reduced. When the cooling load detected by the cooling load detecting means is large, the cooling water temperature adjusting means adjusts the cooling means so that the temperature of the cooling water supplied to the absorber and the condenser becomes a predetermined temperature.

Conversely, if the cooling load is small during the cooling operation, the cooling capacity of the cooling water of the cooling means may be small. That is, the cooling means has a surplus capacity. When the cooling load detected by the cooling load detecting means is small, the cooling water temperature adjusting means adjusts the cooling means so that the temperature of the cooling water supplied to the absorber and the condenser becomes lower than a predetermined temperature. I do. When the temperature of the cooling water supplied to the absorber and the condenser decreases, the ability of the absorber to absorb the vaporized refrigerant into the absorbing liquid increases, and the temperature of the absorber decreases, and the temperature of the evaporator also decreases. In addition, the pressure in the evaporator is kept low, the boiling point is kept low, and the ability to vaporize the refrigerant is increased. In addition, the ability of the condenser to cool and liquefy the vaporized refrigerant also increases. In this way, the efficiency of the absorption refrigeration cycle is improved by increasing the absorption capacity of the absorber and the liquefaction capacity of the refrigerant in the condenser, and increasing the vaporization capacity of the refrigerant in the evaporator. As a result, the heating capacity of the heating unit that heats the absorbing liquid can be suppressed.

According to the second aspect of the present invention, as described above, when the cooling load is small, the heating capacity of the absorbing liquid by the heating unit can be suppressed low. Energy consumption can be reduced. That is,
When the cooling load is small, the energy consumption of the absorption cooling device can be suppressed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an absorption type cooling device of the present invention will be described with reference to the drawings based on an example in which the absorption type cooling device capable of heating operation is applied. FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 shows an absorption system using a double effect absorption refrigeration cycle for air-conditioning a room. It is a schematic structure figure of a type cooling and heating device. The double-effect absorption refrigeration cycle 1 includes a heating unit 2 for heating a low-concentration absorbent (in this embodiment, an aqueous solution of lithium bromide). A high-temperature regenerator 3 that vaporizes (evaporates) a refrigerant (water in the present embodiment) contained in the concentration absorbent and converts the low-concentration absorbent into a medium-concentration absorbent, and heat of condensation of the vaporized refrigerant in the high-temperature regenerator 3 Utilize the medium concentration absorbing liquid to vaporize the refrigerant contained in the medium concentration absorbing liquid,
A low-temperature regenerator 4 for converting a medium-concentration absorbent to a high-concentration absorbent, a condenser 5 for cooling and liquefying vaporized refrigerant (steam) from the high-temperature regenerator 3 and the low-temperature regenerator 4, and liquefaction by the condenser 5 An evaporator 6 for evaporating the liquefied refrigerant (water) under a pressure close to vacuum and an absorber 7 for absorbing the vaporized refrigerant evaporated by the evaporator 6 into the high-concentration absorbent obtained by the low-temperature regenerator 4. Be composed.

[Explanation of the high temperature regenerator 3 including the heating unit 2] The heating unit 2 of the present embodiment generates heat by burning gas as a fuel, and heats the absorbing liquid by the generated heat. The apparatus includes a gas burner 8 for burning gas, gas supply means 9 for supplying gas to the gas burner 8, a combustion fan 10 for supplying air for combustion to the gas burner 8, and the like. The heat generated by the gas combustion of the gas burner 8 is provided to heat the boiler 11 to which the low-concentration absorbing liquid is supplied.

The low-concentration absorbing liquid that has boiled in the boiler 11 is blown out from a blow-off tube 12 extending upward from the boiler 11 into a cylindrical high-temperature regeneration vessel 13 provided above the boiler 11. The high-temperature, low-concentration absorbent blown into the high-temperature regeneration container 13 is supplied to a baffle 13 for gas-liquid separation.
Collide with a. Then, the low-concentration absorbing liquid blown into the high-temperature regeneration container 13 is partially evaporated to become a vaporized refrigerant, and the remaining liquid drops around the blowing cylinder 12 to become a medium-concentration absorbing liquid.
The vaporized refrigerant is cooled by the heat of the vapor of the medium-concentration absorbing liquid in the low-temperature regenerator 4 to be described later, which is cooled by the wall of the high-temperature regenerating container 13 to become a liquefied refrigerant (water).

In order to separate the liquefied refrigerant (water) from the medium-concentration absorbing liquid, a blow-out tube 12
A partition tube 14 is provided between the container and the high-temperature regeneration container 13. Then, as described above, the liquefied refrigerant (water) cooled and liquefied in the high-temperature regeneration container 13 and separated outside the partition tube 14 is supplied to the condenser 5 through the liquid refrigerant pipe 15 connected to the lower part. The medium-concentration absorbent separated between the inside of the partition tube 14 and the blow-out tube 12 is supplied to the medium-liquid pipe 16 connected to the lower part.
And supplied to the low-temperature regenerator 4. The middle liquid pipe 16
Is provided with a throttle means 17 such as an orifice.
When the cooling / heating switching valve 65, which will be described later, is closed, the throttle means 17 flows the medium-concentration absorbing liquid, and when the cooling / heating switching valve 65 is opened, the medium-concentration absorbing liquid hardly flows.

[Explanation of the low-temperature regenerator 4]
Low temperature regenerating container 2 in the shape of a cylindrical container covering high temperature regenerating container 13
0, and the medium-concentration absorbing liquid supplied through the medium liquid pipe 16 is injected toward the ceiling portion of the high-temperature regeneration container 13. The temperature in the low temperature regeneration container 20 is
, The pressure in the low-temperature regeneration vessel 20 is lower than the pressure in the high-temperature regeneration vessel 13. For this reason,
The medium-concentration absorbing liquid supplied from the medium liquid pipe 16 into the low-temperature regeneration container 20 easily evaporates. Then, when the medium-concentration absorbent is poured into the ceiling of the high-temperature regeneration container 13, the high-temperature regeneration container 13
The medium-concentration absorbing liquid is heated by the wall, and a part of the refrigerant contained in the medium-concentration absorbing liquid evaporates to become a vaporized refrigerant, and the remainder becomes a high-concentration absorbing liquid.

Here, the upper part of the low-temperature regenerating container 20 communicates with the upper part of the condensing container 21 in the shape of an annular container through a communicating part 22. For this reason, the vaporized refrigerant evaporated in the low-temperature regeneration container 20 is supplied into the condensation container 21 through the communication portion 22. On the other hand, the high-concentration absorbent falls to the lower part of the low-temperature regeneration container 20 and is supplied to the absorber 7 through the high-liquid pipe 23 connected to the lower part of the low-temperature regeneration container 20. Note that a ceiling plate 24 is provided above the low-temperature regeneration container 20, and a gap 25 through which the vaporized refrigerant passes is provided between the outer peripheral end of the ceiling plate 24 and the low-temperature regeneration container 20.

[Explanation of the condenser 5] The condenser 5 is covered by a condensing container 21 having an annular container shape. Inside the condensing container 21, a condensing heat exchanger 26 for cooling and liquefying the vaporized refrigerant in the condensing container 21 is arranged. The condensing heat exchanger 26 is an annular coil through which cooling water flows. Then, from the low-temperature regenerator 4 to the condensing container 21
The liquefied refrigerant supplied inside is cooled and liquefied by the condensing heat exchanger 26, and is dropped below the condensing heat exchanger 26.

On the other hand, a refrigerant is supplied to the lower side of the condensing container 21 from the high temperature regenerator 3 through the liquid refrigerant pipe 15. When the supplied refrigerant is supplied into the condensing container 21, the pressure difference (the pressure inside the condensing container 21 is about 70 mmHg).
From low pressure), the mixture is reboiled, and supplied in a state where the vaporized refrigerant and the liquefied refrigerant are mixed. Further, a low-temperature liquefied refrigerant supply passage 31 that guides the liquefied refrigerant to the evaporator 6 is connected to the condensation container 21. The low-temperature liquefied refrigerant supply path 31 is provided with a refrigerant valve 32 that opens when energized. The refrigerant valve 32 controls the supply amount of the liquefied refrigerant supplied from the condensation container 21 to the evaporator 6.

[Explanation of the evaporator 6] The evaporator 6 includes an absorber 7
At the same time, it is provided at the lower part of the condensing container 21 and is covered by an evaporation absorption container 33 having an annular container shape provided around the low temperature regeneration container 20. An evaporation heat exchanger 34 for evaporating the liquefied refrigerant supplied from the condenser 5 is disposed outside the inside of the evaporation absorption container 33.
The evaporating heat exchanger 34 is an annular coil through which a heat medium (cold / hot water) supplied to an indoor heat exchanger 37 by a cold / hot water circuit 36 described later flows. The liquefied refrigerant supplied from the condenser 5 via the low-temperature liquefied refrigerant supply passage 31 is sprayed onto the evaporating heat exchanger 34 from a refrigerant spraying tool 35 disposed above the evaporating heat exchanger 34. You.

Since the inside of the evaporating and absorbing vessel 33 is kept substantially at a vacuum (for example, 6.5 mmHg), it has a low boiling point, and the liquefied refrigerant sprayed to the evaporating heat exchanger 34 is very easy to evaporate. The liquefied refrigerant sprayed to the evaporating heat exchanger 34 evaporates by removing heat of vaporization from the heat medium flowing in the evaporating heat exchanger 34. As a result, the heat medium flowing in the evaporating heat exchanger 34 is cooled. Then, the cooled heat medium is guided to the indoor heat exchanger 37 and exchanges heat with air blown into the room to cool the room.

[Cool and hot water circuit 36 and indoor heat exchanger 37
The cold / hot water circuit 36 is a circuit that guides the cold / hot water that has passed through the evaporator 6 to an indoor heat exchanger 37 installed indoors, and guides the cold / hot water that has exchanged heat with room air to the evaporator again. In the cold / hot water circuit 36, in addition to the indoor heat exchanger 37, a cold / hot water pump 38 for pumping cold / hot water is provided. Further, the indoor heat exchanger 37 is provided with an indoor fan 39 for forcibly exchanging heat between the cold and hot water flowing through the indoor heat exchanger 37 and the indoor air and blowing out the air after the heat exchange into the room. I have.

[Description of Absorber 7] As described above, the absorber 7 is covered with the evaporation absorption container 33. And the absorber 7
The absorption heat exchanger 41 for cooling the high-concentration absorption liquid supplied from the high liquid pipe 23 is provided inside the evaporation absorption container 33.
Is arranged. The absorption heat exchanger 41 is a ring-shaped coil, and the inside thereof is supplied with cooling water for cooling the high-concentration absorption liquid sprayed on the coil. The cooling water that has passed through the absorption heat exchanger 41 passes through the condensation heat exchanger 26 of the condenser 5 and is then guided to a cooling water circuit 46 described below,
After being cooled by the cooling means 47, the absorption heat exchanger 41 is again
Is led to.

On the other hand, on the upper part of the absorption heat exchanger 41, there is arranged an absorption liquid disperser 42 for dispersing the high concentration absorption liquid supplied from the high liquid pipe 23 to the absorption heat exchanger 41. The high-concentration absorption liquid sprayed on the absorption heat exchanger 41 is vaporized by evaporation in the evaporation heat exchanger 34 while falling from above to below along the coil surface of the absorption heat exchanger 41. Absorbs refrigerant. As a result, the absorption liquid that has dropped to the bottom of the evaporation absorption container 33 becomes a low-concentration absorption liquid having a reduced concentration. At the bottom of the evaporative absorption container 33,
A low liquid pipe 43 for supplying the low concentration absorbing liquid at the bottom of the heating unit 2 to the boiler 11 of the heating unit 2 is connected. The low liquid tube 43 is connected to the evaporator 11 from inside the evaporation absorption container 33 in a substantially vacuum state.
A solution pump 44 is provided for flowing the low-concentration absorbing liquid toward.

[Explanation of Cooling Water Circuit 46 and Cooling Means 47] The cooling water circuit 46 passes through the absorption refrigeration cycle 1 the cooling water having passed through the absorber 7 and the condenser 5 and having increased temperature.
The cooling water is supplied to the external cooling means 47, and the cooling water cooled by the cooling means 47 is sent to the absorber 7 and the condenser 5 again. A cooling water pump 48 is provided for pressure feeding.

The cooling means 47 comprises a cooling tower 51 and a cooling water fan 52 provided in the cooling water circuit 46. The cooling tower 51 allows the cooling water that has passed through the absorber 7 and the condenser 5 to flow downward from above, exchanges heat with the outside air while flowing, and radiates heat, and partially evaporates while flowing. Deprives the cooling water flowing during evaporation of heat of vaporization,
An evaporative type that cools the flowing cooling water, a spraying part 53 for spraying the cooling water upward, an evaporating part 54 having a large surface area through which the cooling water flows, and a collecting part for collecting the cooling water passing through the evaporating part 54. And a unit 55.

On the other hand, the cooling water fan 52 generates an air flow in the evaporating section 54 to promote the evaporation and cooling of the cooling water in the evaporating section 54. The cooling water collected by the collecting unit 55 is guided to a cooling water tank 56 installed at a lower part. The cooling water tank 56 is provided with a water level sensor (not shown) for detecting the water level of the internal cooling water, and is provided so as to replenish the cooling water when the water level decreases.

[Description of Components Other than the Above] Reference numeral 60 shown in FIG. 1 indicates a medium-concentration absorbent flowing from the high-temperature regenerator 3 to the low-temperature regenerator 4 and a low-concentration absorbent flowing from the absorber 7 to the heating unit 2. Is a high-temperature heat exchanger that exchanges heat with the intermediate-concentration absorbent flowing from the high-temperature regenerator 3 to the low-temperature regenerator 4 and, conversely, heats the low-concentration absorbent flowing from the absorber 7 to the heating unit 2. is there. Reference numeral 61 shown in FIG. 1 denotes a low-temperature heat exchanger that exchanges heat between the high-concentration absorbent flowing from the low-temperature regenerator 4 to the absorber 7 and the low-concentration absorbent flowing from the absorber 7 to the heating unit 2. The high-concentration absorbent flowing from the low-temperature regenerator 4 to the absorber 7 is cooled, while the low-concentration absorbent flowing from the absorber 7 to the heating unit 2 is heated.

[Explanation of Heating Operation Means 63] The absorption refrigeration cycle 1 of this embodiment is provided with heating operation means 63 for performing a heating operation in addition to the cooling operation by the above-described operation. . The heating operation means 63 branches off from the middle of the middle liquid pipe 16 that guides the medium-concentration absorbent from the high-temperature regenerator 3 to the low-temperature regenerator 4, and evaporates the high-temperature absorbent into the evaporator 6 and the absorber 7. A heating pipe 64 leading to the absorption vessel 33;
A cooling / heating switching valve 65 for opening and closing the heating pipe 64 is provided. The cooling / heating switching valve 65 opens during the heating operation to guide the high-temperature absorbing liquid into the evaporating / absorbing container 33 and heat the heat medium flowing in the evaporating heat exchanger 34 of the evaporator 6. During the heating operation, the cooling device pump 48 and the cooling water fan 52 for circulating the cooling water are stopped, and the control device 70 described later is operated such that the cooling and hot water pump 38 and the indoor fan 39 for circulating the heat medium are operated. The energization is controlled.

[Explanation of the control device 70]
The above-described refrigerant valve 32, cooling / heating switching valve 65, solution pump 44,
Cooling / heating water pump 38, cooling water pump 48, indoor fan 3
9, electric functional components such as the cooling water fan 52 and the electric functional components of the heating unit 2 (the combustion fan 10, the gas amount control valve 7
1, the gas on-off valve 72, the ignition device 73, etc.) are controlled in accordance with an operation instruction of a controller (not shown) manually set by a user or input signals of a plurality of sensors provided.

The control device 70 includes a cooling water temperature sensor 75 for detecting the temperature of the cooling water guided from the cooling tower 51 to the absorber 7 and a temperature of the outdoor air in which the cooling tower 51 is installed. An outside air temperature sensor 76 (outside air temperature detecting means) is provided. Then, the control device 70 controls the operating state of the cooling water fan 52 of the cooling means 47 based on the outside air temperature detected by the outside air temperature sensor 76 to change the temperature of the cooling water detected by the cooling water temperature sensor 75. The cooling water temperature adjusting means 77 for adjusting is provided.

The cooling water temperature adjusting means 77 of this embodiment adjusts the temperature of the cooling water based on the outside air temperature and the heating state of the heating section 2 (the gas combustion state). here,
In the heating unit 2 according to the present embodiment, the combustion state of the gas in the gas burner 8 is stopped according to the cooling load (for example, the temperature of the cold / hot water flowing into the evaporating heat exchanger 34 from the indoor heat exchanger 37). 0 kcal / h), low (for example, 2500 kc
al / h) and high (for example, 6000 kcal / h).

The operation of controlling the temperature of the cooling water by the cooling water temperature adjusting means 77 will be described with reference to the flowchart of FIG. During the cooling operation (start), it is determined whether the combustion state of the gas burner 8 is the stop state (step S1).
). If the determination is YES, the process returns to step S1. If the result of the determination in step S1 is NO, it is determined whether the combustion state of the gas burner 8 is low (step S2). If the determination result is YES (the combustion state of the gas burner 8 is low), it is determined whether or not the outside air temperature detected by the outside air temperature sensor 76 is 25 ° C. or higher (step S3).
). If this determination is NO, the cooling water temperature sensor 7
The energization state of the cooling water fan 52 is controlled so that the temperature detected in step 5 is maintained at 27 ° C. (step S4). If the determination result of step S3 is YES, the energization state of the cooling water fan 52 is controlled so that the temperature detected by the cooling water temperature sensor 75 is maintained at 29 ° C. (step S3).
Five ).

If the determination result in step S2 is NO (the combustion state of the gas burner 8 is high), it is determined whether or not the outside air temperature detected by the outside air temperature sensor 76 is 25 ° C. or higher (step S6). If this determination result is NO, step S
5 and the temperature detected by the cooling water temperature sensor 75 becomes 2
The power supply state of the cooling water fan 52 is controlled so as to be maintained at 9 ° C. If the determination result of step S6 is YES, the energization state of the cooling water fan 52 is controlled so that the temperature detected by the cooling water temperature sensor 75 is maintained at 31 ° C. (step S7).

[Effect of the first embodiment] When the combustion state of the gas in the gas burner 8 is high and the outside air temperature is lower than 25 ° C,
The cooling water temperature adjusting means 77 controls the temperature of the cooling water to 29 ° C., which is lower than 31 ° C. when the outside air temperature is high. When the temperature of the cooling water is controlled at 29 ° C. lower than 31 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid increases. In addition, the ability of the condenser 5 to liquefy the vaporized refrigerant also increases. As described above, the efficiency of the absorption refrigeration cycle 1 is improved and the cooling capacity of the absorption refrigeration cycle 1 is increased by increasing the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5. When the cooling capacity increases, the room is cooled, and the time when the gas combustion state of the gas burner 8 shifts from high to low is earlier.

When the combustion state of the gas in the gas burner 8 is low and the outside air temperature is lower than 25 ° C., the cooling water temperature control means 7
7 controls the temperature of the cooling water to 27 ° C., which is lower than 29 ° C. when the outside air temperature is high. When the temperature of the cooling water is controlled at 27 ° C. lower than 29 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid further increases. In addition, the ability of the condenser 5 to liquefy the vaporized refrigerant further increases.
As described above, the efficiency of the absorption refrigeration cycle 1 is improved and the cooling capacity of the absorption refrigeration cycle 1 is increased by increasing the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5. When the cooling capacity increases, the room is cooled, and the time when the combustion state of the gas in the gas burner 8 shifts from low to stop is earlier.

As described above, when the outside air temperature is lower than 25 ° C., by setting the temperature of the cooling water to be low, the combustion state of the gas in the gas burner 8 is changed from high to low and low to stop at an early stage. Since the shift is performed, the amount of gas combustion in the gas burner 8 can be suppressed low. That is, it is possible to reduce energy consumption when performing cooling using the absorption refrigeration cycle 1.

[Second Embodiment] FIGS. 3 and 4 show a second embodiment.
FIG. 3 is a schematic configuration diagram of an absorption type cooling and heating apparatus, and FIG. 4 is a flowchart showing an operation of a cooling water temperature adjusting means 77. The control device 70 includes a cooling load detecting unit that detects a cooling load during the cooling operation. The cooling load detecting means of this embodiment uses a cold / hot water outlet temperature sensor 81 that detects the temperature of the cold / hot water cooled by passing through the evaporating heat exchanger 34. In this embodiment, when the temperature detected by the cooling / heating water outlet temperature sensor 81 is higher than 9 ° C., it is determined that the cooling load is large. When the temperature is lower than 7 ° C., it is determined that the cooling load is small. During the period, it is determined that the cooling load is medium. Further, the cooling water temperature adjusting means 77 of the present embodiment controls the operation state of the cooling water fan 52 of the cooling means 47 based on the temperature of the cold water detected by the cold / hot water outlet temperature sensor 81, and Sensor 75
Adjust the temperature of the cooling water detected in.

The operation of controlling the temperature of the cooling water by the cooling water temperature adjusting means 77 will be described with reference to the flowchart of FIG. During the cooling operation (start), it is determined whether or not the cold / hot water outlet temperature detected by the cold / hot water outlet temperature sensor 81 is lower than 7 ° C. (step S11). If the determination result is YES (the cooling load is small), the power supply state of the cooling water fan 52 is controlled so that the cooling water temperature detected by the cooling water temperature sensor 75 is maintained at 27 ° C. (step S12). . If the determination result in step S12 is NO, it is determined whether or not the cold / hot water outlet temperature detected by the cold / hot water outlet temperature sensor 81 is lower than 9 ° C. (step S13). If the determination result is YES (the cooling load is medium), the power supply state of the cooling water fan 52 is controlled so that the cooling water temperature detected by the cooling water temperature sensor 75 is maintained at 29 ° C. (step S14). . If the determination result in step S13 is NO (the cooling load is large), the power supply state of the cooling water fan 52 is controlled so that the cooling water temperature detected by the cooling water temperature sensor 75 is maintained at 31 ° C. (step S13). S15).

[Effects of the Second Embodiment] As shown in the above operation, when the cooling load is medium, the cooling water temperature adjusting means 77
Controls the temperature of the cooling water to 29 ° C., which is lower than 31 ° C. when the cooling load is large. When the temperature of the cooling water is controlled at 29 ° C. lower than 31 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid increases. In addition, the ability of the condenser 5 to liquefy the vaporized refrigerant also increases. As described above, the efficiency of the absorption refrigeration cycle 1 is improved and the cooling capacity of the absorption refrigeration cycle 1 is increased by increasing the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5.

When the cooling load is small, the cooling water temperature adjusting means 77 adjusts the temperature of the cooling water to 29 when the cooling load is medium.
Control to 27 ° C, which is lower than 27 ° C. When the temperature of the cooling water is controlled at 27 ° C. lower than 29 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid further increases. In addition, the ability of the condenser 5 to liquefy the vaporized refrigerant further increases. As described above, the efficiency of the absorption refrigeration cycle 1 is improved by increasing the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5, and the absorption refrigeration cycle 1 is improved.
Cooling capacity is increased.

As described above, when the cooling capacity is increased, the room is cooled, and the time when the gas combustion state of the gas burner 8 shifts from high to low or from low to stop is earlier. As a result, the amount of gas combustion in the gas burner 8 can be reduced. That is, absorption refrigeration cycle 1
In this case, the energy consumption when cooling is performed by using the heat treatment can be reduced.

[Modifications] The numerical values shown in the above embodiments are merely examples for explaining the embodiments, and the present invention is not limited to the numerical values of the embodiments at all and is suitable for the purpose of use and the apparatus. Can be adopted. An example of controlling the cooling water temperature stepwise according to the outside air temperature was shown,
The temperature of the cooling water may be controlled continuously or in multiple stages according to the outside air temperature. Although the example in which the temperature of the cooling water is controlled stepwise according to the cooling load has been described, the temperature of the cooling water may be controlled continuously or in multiple steps according to the cooling load. As an example of detecting the cooling load, an example in which the cooling load is detected from the cooling / heating water outlet temperature has been described, but the cooling load is determined based on a difference between the cooling / heating water inlet temperature and the cooling / heating water outlet temperature, the number of indoor heat exchangers used, and the like. The cooling load may be detected by another detection method such as detecting the cooling load. The invention according to claim 1 and the invention according to claim 2 may be used in combination. That is, for example, the first embodiment and the second embodiment may be combined.

In the above embodiment, a double-effect absorption refrigeration cycle has been described as an example. However, a single-effect absorption refrigeration cycle may be used, or a triple-effect absorption refrigeration cycle of three or more times may be used. But it is good. In addition, when the medium-concentration absorbing liquid is injected into the low-temperature regenerator, an example in which the medium-concentration absorbing liquid is injected from above the low-temperature regenerator has been described.

Although a gas burner is used as a heating source of the heating section, an oil burner or an electric heater may be used, or exhaust heat of another device (for example, an internal combustion engine) may be used. Although the example in which the heat exchanger for condensation, the heat exchanger for evaporation, and the heat exchanger for absorption are provided in a coil shape is shown, the heat exchanger of another type such as a tube and fin or a stacked heat exchanger is used. Is also good. Although an aqueous lithium bromide solution has been described as an example of the absorbing liquid, other absorbing liquids such as an aqueous ammonia solution using ammonia as a refrigerant and water as an absorbent may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an absorption type cooling and heating device (first embodiment).

FIG. 2 is a flowchart showing an operation of a cooling water temperature adjusting means (first embodiment).

FIG. 3 is a schematic configuration diagram of an absorption type cooling and heating device (second embodiment).

FIG. 4 is a flowchart showing the operation of a cooling water temperature adjusting means (second embodiment).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption refrigeration cycle 2 Heating part 3 High temperature regenerator 4 Low temperature regenerator 5 Condenser 6 Evaporator 7 Absorber 37 Indoor heat exchanger 46 Cooling water circuit 47 Cooling means 76 Outside air temperature sensor (outside air temperature detecting means) 77 Cooling water temperature Adjusting means 81 Cooling / hot water outlet temperature sensor (cooling load detecting means)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25B 15/00 306 F25B 15/00

Claims (2)

(57) [Claims] 1. A heating section for heating an absorbing liquid, a regenerator for heating the absorbing liquid in the heating section to vaporize a refrigerant contained in the absorbing liquid, and cooling and liquefying a vaporized refrigerant generated in the regenerator. A condenser, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, an absorption refrigeration cycle including an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbing liquid, and A cooling water circuit for circulating cooling water for cooling the refrigerant in the condenser while cooling the absorbing liquid; and a cooling means provided in the cooling water circuit for cooling the cooling water by outdoor air. An absorption type cooling device capable of performing a cooling operation for cooling a room by guiding a heat medium cooled by deprivation of latent heat of evaporation when the liquefied refrigerant evaporates to an indoor heat exchanger installed in the room. In The absorption-type cooling apparatus further includes an outside air temperature detecting unit that detects an outdoor temperature, and when the temperature detected by the outside air temperature detecting unit is high, cooling water supplied to the absorber and the condenser. The cooling means is adjusted so that the temperature of the cooling water becomes a predetermined temperature, and when the temperature detected by the outside air temperature detecting means is low, the temperature of the cooling water supplied to the absorber and the condenser is lower than the predetermined temperature. A cooling water temperature adjusting means for adjusting the cooling means so as to have a low temperature. 2. A heating section for heating the absorbing liquid, a regenerator for heating the absorbing liquid in the heating section to vaporize a refrigerant contained in the absorbing liquid, and cooling and liquefying the vaporized refrigerant generated in the regenerator. A condenser, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, an absorption refrigeration cycle including an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbing liquid, and A cooling water circuit for circulating cooling water for cooling the refrigerant in the condenser while cooling the absorbing liquid; and a cooling means provided in the cooling water circuit for cooling the cooling water by outdoor air. An absorption type cooling device capable of performing a cooling operation for cooling a room by guiding a heat medium cooled by deprivation of latent heat of evaporation when the liquefied refrigerant evaporates to an indoor heat exchanger installed in the room. In The absorption-type cooling apparatus further includes a cooling load detection unit that detects a cooling load in the room by the indoor heat exchanger, and when the cooling load detected by the cooling load detection unit is large, the absorber and the absorption unit The cooling means is adjusted so that the temperature of the cooling water supplied to the condenser becomes a predetermined temperature, and when the cooling load detected by the cooling load detecting means is small, the cooling water is supplied to the absorber and the condenser. An absorption-type cooling apparatus, comprising: cooling water temperature adjusting means for adjusting the cooling means so that the temperature of the cooling water is lower than the predetermined temperature.