JPH0821670A - Absorption type cooler - Google Patents

Abstract

PURPOSE:To improve a cooling efficiency and restrict energy consumption in a heating unit. CONSTITUTION:When cooling operation is effected by an absorption type refrigerating cycle 1 and an outside temperature is lower than 25 deg.C, a cooling water temperature regulating means 77, provided in a control device 70, controls the cooling water fan 52 of a cooling means 47 so that a cooling water temperature becomes lower by 2 deg.C than in the case the outside temperature is at least 25 deg.C. When the cooling water temperature is reduced, the liquefying and absorbing capacities of evaporated refrigerant in a condenser 5 and an absorber 7 are promoted whereby the efficiency of the absorption type refrigerating cycle 1 is improved. According to this method, a cooling efficiency in a room is improved and the fuel consumption of gas of a gas burner 8 in a heating unit 2 can be restrained whereby the energy consumption of the absorption type cooler can be restrained.

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 device 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
A regenerator that heats the absorption liquid and vaporizes a part of the absorption liquid,
A condenser that cools and liquefies the vaporized refrigerant generated in the regenerator, an evaporator that evaporates the liquefied refrigerant liquefied in the condenser under low pressure, and an absorbent that absorbs the vaporized refrigerant evaporated in the evaporator. The absorption liquid, which is composed of an absorber and has absorbed the vaporized refrigerant in the absorber, is sent to the regenerator by the solution pump. When the refrigerant evaporates in the evaporator, latent heat is taken from the heat medium (water or the like) sent from the evaporator to the indoor heat exchanger. Then, the heat medium that has been deprived of heat and cooled is sent to the indoor heat exchanger to exchange heat with the indoor air and cool the room. On the other hand, the condenser and the absorber are supplied with cooling water that cools the vaporized refrigerant to liquefy it or cools the dispersed absorption liquid to accelerate the refrigerant absorption capacity. This cooling water is generally circulated through a circulation path, cooled by cooling means provided in the circulation path, and then supplied to a condenser and an absorber. The cooling means is adjusted so that the temperature of the cooling water supplied to the condenser and the absorber is constant.

[0003]

The capacity of the cooling means is set so that the cooling capacity is satisfied even when the temperature of the cooling water is adjusted to a constant temperature, the outside air temperature is high, and the cooling load is large. . Therefore, when the outside air temperature is low,
When the cooling load is small, the cooling means has an excessive capacity. On the other hand, the absorption type cooling device includes a heating unit that heats the absorbing liquid in the regenerator. Since the energy consumption of the absorption type cooling device is mainly consumed by the heating section, it is desired to suppress the energy consumed by this heating section.

[0004]

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

[0005]

The absorption type cooling apparatus of the present invention employs the following technical means in order to achieve the above object. [Means of Claim 1] In the absorption type cooling apparatus, a heating unit for heating the absorbing liquid, a regenerator for heating the absorbing liquid by the heating unit to vaporize a refrigerant contained in the absorbing liquid, and a regenerator An absorption formula comprising a condenser for cooling and liquefying the vaporized refrigerant, an evaporator for evaporating the liquefied refrigerant liquefied by the condenser under low pressure, and an absorber for absorbing the vaporized refrigerant evaporated by the evaporator into an absorbing liquid. A refrigeration cycle, a cooling water circuit for cooling the absorbing liquid in the absorber and a cooling water for cooling the refrigerant in the condenser, and a cooling water circuit provided in the cooling water circuit for cooling the cooling water by outdoor air Means for introducing a latent heat of vaporization when the liquefied refrigerant is evaporated in the evaporator and cooling the heat medium to an indoor heat exchanger installed in the room, thereby performing a cooling operation for cooling the room. To do.

This absorption type cooling device is provided with an outside air temperature detecting means for detecting the temperature outside the room, and when the temperature detected by the outside air temperature detecting means is high, it is supplied to the absorber and the condenser. If 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 adjusted as described above. A cooling water temperature adjusting means for adjusting the cooling means so that the temperature is lower than a predetermined temperature is provided.

[Means for Claim 2] The absorption type cooling device is a heating unit for heating the absorbing liquid, a regenerator for heating the absorbing liquid by the heating unit to vaporize a refrigerant contained in the absorbing liquid, and the regenerating unit. A condenser for cooling and liquefying the vaporized refrigerant generated in the condenser, an evaporator for evaporating the liquefied refrigerant liquefied by the condenser under low pressure, and an absorber for absorbing the vaporized refrigerant vaporized by the evaporator in an absorbing liquid Absorption refrigeration cycle to, and a cooling water circuit that circulates cooling water that cools the refrigerant in the condenser while cooling the absorbing liquid in the absorber, and is provided in this cooling water circuit, and the cooling water is supplied by the outdoor air. And a cooling means for cooling, wherein the heat medium, which is cooled by removing latent heat of vaporization when the liquefied refrigerant is evaporated in the evaporator, is guided to the indoor heat exchanger installed in the room, thereby cooling the room. Cooling operation Cormorant.

This absorption type cooling device is provided with a cooling load detecting means for detecting the indoor cooling load by the indoor heat exchanger, and when the cooling load detected by this cooling load detecting means is large, the absorption is performed. When the cooling load detected by the outside air temperature detecting means is small, the cooling means is adjusted so that the temperature of the cooling water supplied to the condenser and the condenser becomes a predetermined temperature. The cooling water temperature adjusting means for adjusting the cooling means is provided so that the temperature of the supplied cooling water becomes lower than the predetermined temperature.

[0009]

[Operation and effect of the invention]

[Operation of Claim 1] When the outdoor temperature is high during the cooling operation, the cooling capacity of the cooling water 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, during the cooling operation, when the outdoor temperature is low, 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 so that the temperature of the cooling water supplied to the absorber and the condenser is lower than the 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, the temperature of the absorber decreases, and the temperature of the evaporator also decreases. , The pressure inside the evaporator is kept low, the boiling point is kept low, and the ability to vaporize the refrigerant is increased. Further, also in the condenser, the ability to cool and liquefy the vaporized refrigerant becomes high. Thus, the absorption capacity of the absorber and the liquefaction capacity of the refrigerant in the condenser are increased, and the vaporization capacity of the refrigerant in the evaporator is increased, so that the efficiency of the absorption refrigeration cycle is improved.
As a result, the heating capacity of the heating unit that heats the absorbing liquid can be suppressed.

[Advantageous Effects] According to the absorption type 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 unit is suppressed to be low, so that the heating unit is heated. Energy consumption can be reduced. That is,
When the temperature of the outdoor air is low, the energy consumption of the absorption type cooling device can be suppressed even if the cooling load in the room is constant.

When the cooling load is high during the cooling operation, the cooling means is required to have a large cooling capacity. 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.

On the other hand, when the cooling load is small during the cooling operation, the cooling capacity of the cooling water of the cooling means can 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 is lower than a predetermined temperature. To 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, the temperature of the absorber decreases, and the temperature of the evaporator also decreases. , The pressure inside the evaporator is kept low, the boiling point is kept low, and the ability to vaporize the refrigerant is increased. Further, also in the condenser, the ability to cool and liquefy the vaporized refrigerant becomes high. Thus, the absorption capacity of the absorber and the liquefaction capacity of the refrigerant in the condenser are increased, and the vaporization capacity of the refrigerant in the evaporator is increased, so that the efficiency of the absorption refrigeration cycle is improved. As a result, the heating capacity of the heating unit that heats the absorbing liquid can be suppressed.

[Advantageous Effects] According to the absorption type cooling device of the present invention, as described above, when the cooling load is small, the heating capacity of the absorbing liquid by the heating part is suppressed to a low level. Energy consumption can be reduced. That is,
When the cooling load is small, the energy consumption of the absorption type cooling device can be suppressed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an absorption type air conditioner according to the present invention will be described with reference to the drawings based on an embodiment applied to an absorption type air conditioner capable of heating operation. [Structure of First Embodiment] FIGS. 1 and 2 show a first embodiment in which claim 1 is adopted. FIG. 1 shows absorption using a double-effect absorption refrigeration cycle for air conditioning the room. It is a schematic block diagram of a type air conditioner. The double-effect absorption refrigeration cycle 1 includes a heating unit 2 for heating a low-concentration absorbent (lithium bromide aqueous solution in this embodiment). The high-temperature regenerator 3 that vaporizes (evaporates) the refrigerant (water in this embodiment) contained in the concentrated absorbent to convert the low-concentrated absorbent to the medium-concentrated absorbent, and the condensation heat of the vaporized refrigerant in the high-temperature regenerator 3. To heat the medium-concentration absorbent, vaporize the refrigerant contained in the medium-concentration absorbent,
A low-temperature regenerator 4 for converting a medium-concentration absorption liquid into a high-concentration absorption liquid, a condenser 5 for cooling and liquefying the vaporized refrigerant (steam) from the high-temperature regenerator 3 and the low-temperature regenerator 4, and liquefaction by the condenser 5. From the evaporator 6 that evaporates the liquefied refrigerant (water) under a pressure close to a vacuum, and the absorber 7 that absorbs the vaporized refrigerant evaporated in the evaporator 6 into the high-concentration absorption liquid obtained in the low-temperature regenerator 4. Composed.

[Description of High-Temperature Regenerator 3 Including Heating Unit 2] The heating unit 2 of the present embodiment is a combustion-type heating in which a gas that is a fuel is burned to generate heat, and the absorption heat is heated by the generated heat. The apparatus includes a gas burner 8 that burns gas, a gas supply unit 9 that supplies gas to the gas burner 8, a combustion fan 10 that supplies air for combustion to the gas burner 8, and the like. The heat obtained by gas combustion of the gas burner 8 is provided to heat the boiling device 11 to which the low-concentration absorbing liquid is supplied.

The low-concentration absorption liquid that has boiled in the boiling device 11 is blown out from the blowing cylinder 12 extending upward from the boiling device 11 into the high temperature regenerating container 13 in the shape of a cylindrical container provided on the upper part of the boiling device 11. The high-temperature low-concentration absorption liquid blown out into the high-temperature regeneration container 13 is used in the gas-liquid separation baffle 13
collide with a. Then, the low-concentration absorption liquid blown out into the high-temperature regeneration container 13 partially evaporates to become a vaporized refrigerant, and the rest drops around the blow-out cylinder 12 to become a medium-concentration absorption liquid.
The vaporized refrigerant is cooled by the wall of the high-temperature regenerator 13 as the latent heat during evaporation of the medium-concentration absorption liquid in the low-temperature regenerator 4, which will be described later, and is cooled to become a liquefied refrigerant (water).

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

[Description of 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 regenerating container 13. The temperature inside the low-temperature regeneration container 20 is
Since the temperature is lower than the temperature of 1, the pressure inside the low temperature regeneration container 20 is lower than that of the high temperature regeneration container 13. For this reason,
The medium-concentration absorption liquid supplied from the middle liquid pipe 16 into the low temperature regeneration container 20 easily evaporates. Then, when the medium-concentration absorption liquid is injected into the ceiling portion of the high temperature regeneration container 13, the high temperature regeneration container 13
The medium-concentration absorbing liquid is heated by the walls of the medium, a part of the refrigerant contained in the medium-concentrating absorbing liquid evaporates to become a vaporized refrigerant, and the rest becomes a high-concentration absorbing liquid.

Here, the upper part of the low temperature regeneration container 20 communicates with the upper part of the condensing container 21 in the shape of an annular container by a communication part 22. Therefore, the vaporized refrigerant evaporated in the low temperature regeneration container 20 is supplied into the condensing container 21 through the communication part 22. On the other hand, the high-concentration absorption liquid drops to the lower portion of the low temperature regeneration container 20, and is supplied to the absorber 7 through the high liquid pipe 23 connected to the lower portion of the low temperature regeneration container 20. A ceiling plate 24 is provided on the upper side in 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.

[Description of Condenser 5] The condenser 5 is covered with 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 therein is cooled by the condensing heat exchanger 26 and liquefied, and then drops below the condensing heat exchanger 26.

On the other hand, below the condensing vessel 21, the refrigerant is supplied from the above-mentioned high temperature regenerator 3 through the liquid refrigerant pipe 15. In addition, when this supply refrigerant is supplied into the condensing container 21, the pressure difference (about 70 mmHg in the condensing container 21).
From the low pressure), re-boiling, and the vaporized refrigerant and the liquefied refrigerant are supplied in a mixed state. Further, the condensing container 21 is connected to a low-temperature liquefied refrigerant supply passage 31 that guides the liquefied refrigerant to the evaporator 6. The low-temperature liquefied refrigerant supply path 31 is provided with a refrigerant valve 32 that opens by energization. The refrigerant valve 32 adjusts the amount of liquefied refrigerant supplied from the condensing container 21 to the evaporator 6.

[Description of Evaporator 6] The evaporator 6 includes an absorber 7
At the same time, it is provided in the lower part of the condensing container 21, and is covered with an evaporation container 33 in the shape of an annular container provided around the low temperature regeneration container 20. An evaporation heat exchanger 34 for evaporating the liquefied refrigerant supplied from the condenser 5 is arranged outside the inside of the evaporation / absorption container 33.
The heat exchanger 34 for evaporation is an annular coil, and a heat medium (cool / hot water) supplied to an indoor heat exchanger 37 by a cold / hot water circuit 36 described later flows therein. Then, the liquefied refrigerant supplied from the condenser 5 via the low-temperature liquefied refrigerant supply passage 31 is scattered on the evaporation heat exchanger 34 from the refrigerant spraying tool 35 arranged on the evaporation heat exchanger 34. It

Since the inside of the evaporative absorption container 33 is maintained in a substantially vacuum (for example, 6.5 mmHg), the boiling point is low, and the liquefied refrigerant scattered in the heat exchanger 34 for evaporation is very likely to evaporate. Then, the liquefied refrigerant scattered on the heat exchanger for evaporation 34 evaporates by taking heat of vaporization from the heat medium flowing inside the heat exchanger for evaporation 34. As a result, the heat medium flowing in the evaporation heat exchanger 34 is cooled. Then, the cooled heat medium is guided to the indoor heat exchanger 37 and exchanges heat with the air blown into the room to cool the room.

[Cold / hot water circuit 36 and indoor heat exchanger 37
Description] The hot / cold water circuit 36 is a circuit for guiding the cold / hot water that has passed through the evaporator 6 to an indoor heat exchanger 37 installed indoors, and for guiding the cold / hot water that has exchanged heat with indoor 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 warm water flowing through the indoor heat exchanger 37 and the room air, and blowing out the air after the heat exchange into the room. There is.

[Description of Absorber 7] The absorber 7 is covered with the evaporative absorption container 33 as described above. And the absorber 7
Is an absorption heat exchanger 41 for cooling the high-concentration absorption liquid supplied from the high-liquid pipe 23 inside the evaporative absorption container 33.
Is arranged. The absorption heat exchanger 41 is an annular coil, and cooling water for cooling the high-concentration absorption liquid dispersed on the coil is supplied to the inside of the absorption heat exchanger 41. The cooling water that has passed through the absorption heat exchanger 41 is guided to the cooling water circuit 46, which will be described later, after passing through the condensation heat exchanger 26 of the condenser 5.
After being cooled by the cooling means 47, the absorption heat exchanger 41 is again used.
Be led to.

On the other hand, above the absorption heat exchanger 41, there is arranged an absorption liquid spraying tool 42 for spraying the high-concentration absorption liquid supplied from the high liquid pipe 23 to the absorption heat exchanger 41. The high-concentration absorbing liquid sprinkled on the absorption heat exchanger 41 is vaporized by evaporation in the evaporation heat exchanger 34 while traveling along the coil surface of the absorption heat exchanger 41 and falling downward. Absorbs refrigerant. As a result, the absorbing liquid that has dropped to the bottom of the evaporative absorption container 33 becomes a low-concentration absorbing liquid with a reduced concentration. At the bottom of the evaporation / absorption container 33, the evaporation / absorption container 33 is provided.
A low liquid pipe 43 for supplying the low-concentration absorption liquid at the bottom of the heater to the boiling device 11 of the heating unit 2 is connected. The low liquid pipe 43 is connected to the evaporator 11 from the inside of the evaporation and absorption container 33 in a substantially vacuum state.
A solution pump 44 is provided for flowing the low-concentration absorption liquid toward the.

[Explanation of Cooling Water Circuit 46 and Cooling Means 47] The cooling water circuit 46 passes the absorber 7 and the condenser 5 to cool the cooling water whose temperature has risen to the absorption refrigeration cycle 1
Is a circuit for guiding the cooling water cooled by the cooling means 47 to the absorber 7 and the condenser 5 again, and the cooling water circuit 46 sends the cooled cooling water to the absorber. A cooling water pump 48 is provided for pumping to.

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 causes the cooling water that has passed through the absorber 7 and the condenser 5 to flow from the upper side to the lower side, exchanges heat with the outside air to radiate heat while flowing, and partially evaporates while flowing. , Takes the heat of vaporization from the cooling water flowing at the time of evaporation,
It is an evaporative type that cools the cooling water that is flowing, and has a spraying part 53 that sprays the cooling water in the upper part, an evaporating part 54 having a large surface area through which the cooling water flows, and collecting and collecting the cooling water that has passed through this evaporating part 54. And a part 55.

On the other hand, the cooling water fan 52 causes an air flow in the evaporation section 54 to promote evaporation and cooling of the cooling water in the evaporation section 54. The cooling water collected by the collecting unit 55 is guided to the cooling water tank 56 installed in the lower part. The cooling water tank 56 is provided with a water level sensor (not shown) that detects the water level of the cooling water inside, and is provided so as to replenish the cooling water when the water level drops.

[Description of Components Other Than Above] Reference numeral 60 shown in FIG. 1 indicates a medium-concentration absorption liquid flowing from the high-temperature regenerator 3 to the low-temperature regenerator 4 and a low-concentration absorption liquid flowing from the absorber 7 to the heating unit 2. Is a high-temperature heat exchanger for exchanging heat with and for cooling the medium-concentration absorbent flowing from the high-temperature regenerator 3 to the low-temperature regenerator 4, and conversely heating the low-concentration absorbent flowing from the absorber 7 to the heating unit 2. is there. Reference numeral 61 shown in FIG. 1 is a low temperature heat exchanger for exchanging 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 absorption liquid flowing from the low-temperature regenerator 4 to the absorber 7 is cooled, and conversely, the low-concentration absorption liquid flowing from the absorber 7 to the heating unit 2 is heated.

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

[Description of Control Device 70] The control device 70 includes
The above-mentioned refrigerant valve 32, cooling / heating switching valve 65, solution pump 44,
Cold / hot water pump 38, cooling water pump 48, indoor fan 3
9, electrical functional components such as the cooling water fan 52, and electrical functional components of the heating unit 2 (combustion fan 10, gas amount control valve 7
1, gas on-off valve 72, ignition device 73, and the like) are energized and controlled according to an operation instruction of a controller (not shown) manually set by a user or an input signal of each of a plurality of sensors.

The control device 70 has, as sensors, 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 control 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 (gas combustion state) of the heating section 2. here,
In the heating unit 2 of the present embodiment, the combustion state of the gas in the gas burner 8 is stopped (in accordance with the cooling load (for example, the temperature of cold / hot water flowing from the indoor heat exchanger 37 to the evaporation heat exchanger 34)). 0 kcal / h), low (eg 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 or not the combustion state of the gas burner 8 is stopped (step S1).
). If the result of this determination is YES, the process returns to step S1. If the determination result in step S1 is NO, it is determined whether the combustion state of the gas burner 8 is low (step S2). If the result of this determination is YES (the combustion state of the gas burner 8 is low), it is determined whether the outside air temperature detected by the outside air temperature sensor 76 is 25 ° C. or higher (step S3).
). If the result of 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 5 is maintained at 27 ° C. (step S4). If the decision result in the 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 kept at 29 ° C. (step S).
Five ).

When the result of the determination in step S2 is NO (the combustion state of the gas burner 8 is high), it is determined whether the outside air temperature detected by the outside air temperature sensor 76 is 25 ° C. or higher (step S6). If the determination result is NO, step S
5 and the temperature detected by the cooling water temperature sensor 75 is 2
The energization state of the cooling water fan 52 is controlled so as to be maintained at 9 ° C. If the decision result in the 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).

[Effects 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., which is lower than 31 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid becomes high. Further, the condenser 5 also has a high ability to liquefy the vaporized refrigerant. In this way, the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5 are increased, so that the efficiency of the absorption refrigeration cycle 1 is improved and the cooling capacity of the absorption refrigeration cycle 1 is increased. When the cooling capacity becomes high, the room is cooled, and the gas combustion state of the gas burner 8 shifts from high to low at an earlier time.

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 adjusting 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. which is lower than 29 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid becomes higher. Further, also in the condenser 5, the ability to liquefy the vaporized refrigerant is further enhanced.
In this way, the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5 are increased, so that the efficiency of the absorption refrigeration cycle 1 is improved and the cooling capacity of the absorption refrigeration cycle 1 is increased. When the cooling capacity increases, the interior of the gas burner 8 is cooled, and the gas combustion state of the gas burner 8 transitions from low to stop soon.

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

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

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 cold / hot water outlet temperature detected by the cold / hot water outlet temperature sensor 81 is lower than 7 ° C. (step S11). If this determination is YES (the cooling load is small), the energization 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 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 (cooling load is medium), the energization 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). . When the determination result of step S13 is NO (the cooling load is large), the energization 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). S15).

[Effects of 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., which is lower than 31 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid becomes high. Further, the condenser 5 also has a high ability to liquefy the vaporized refrigerant. In this way, the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5 are increased, so that the efficiency of the absorption refrigeration cycle 1 is improved and the cooling capacity of the absorption refrigeration cycle 1 is increased.

When the cooling load is small, the cooling water temperature adjusting means 77 controls the temperature of the cooling water to 29 when the cooling load is medium.
Control at 27 ° C, which is lower than 0 ° C. When the temperature of the cooling water is controlled at 27 ° C. which is lower than 29 ° C., the ability of the absorber 7 to absorb the vaporized refrigerant into the absorbing liquid becomes higher. Further, also in the condenser 5, the ability to liquefy the vaporized refrigerant is further enhanced. In this way, the absorption capacity and the liquefaction capacity of the refrigerant in the absorber 7 and the condenser 5 are increased, so that the efficiency of the absorption refrigeration cycle 1 is improved and the absorption refrigeration cycle 1 is improved.
The cooling capacity of the

As described above, when the cooling capacity becomes high, the interior of the gas burner 8 is cooled and the combustion state of the gas in the gas burner 8 becomes high or low, or the time from low to stop becomes early. As a result, the combustion amount of gas in the gas burner 8 can be suppressed low. In other words, absorption refrigeration cycle 1
It is possible to suppress the energy consumption in the case of performing cooling by using.

[Modification] The numerical values shown in the above embodiments are examples for explaining the embodiments, and the present invention is not limited to the numerical values of the embodiments and is suitable for the purpose of use and the device. It is possible to adopt the numerical value. An example was shown in which the temperature of the cooling water was controlled stepwise according to the outside air temperature.
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 shown, the temperature of the cooling water may be controlled continuously or in multiple steps depending on the cooling load. As an example of detecting the cooling load, the cooling load was detected from the hot / cold water outlet temperature, but the cooling load is determined from the difference between the cold / hot water inlet temperature and the cold / hot water outlet temperature, and the number of indoor heat exchangers used. It may be provided so as to detect the cooling load by another detection method such as detection of. 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, the double-effect absorption refrigeration cycle is shown as an example, but a single-effect absorption refrigeration cycle may be used, or a triple-effect multiple-effect absorption refrigeration cycle. But good. Further, when the medium-concentration absorption liquid is injected into the low temperature regenerator, an example in which it is injected from above the low temperature regenerator has been shown, but it may be injected from below.

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

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an absorption type air conditioner (first embodiment).

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

[Explanation of symbols]

 1 Absorption type 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 Cold / hot water outlet temperature sensor (cooling load detecting means)

Claims (2)

[Claims] 1. A heating unit for heating an absorption liquid, a regenerator for evaporating a refrigerant contained in the absorption liquid by heating the absorption liquid by the heating unit, and a vaporized refrigerant generated in the regenerator for liquefaction. A condenser, an evaporator for evaporating the liquefied refrigerant liquefied by the condenser under low pressure, an absorption refrigeration cycle including an absorber for absorbing the vaporized refrigerant evaporated by the evaporator into an absorption liquid, and the absorber The evaporator includes a cooling water circuit that circulates cooling water that cools the absorption liquid and cools the refrigerant in the condenser, and a cooling unit that is provided in the cooling water circuit and cools the cooling water by outdoor air. When the liquefied refrigerant is evaporated, the absorption heat is removed by removing the latent heat of vaporization and guiding the cooled heat medium to the indoor heat exchanger installed in the room. To In addition, this absorption type cooling device is provided with an outside air temperature detecting means for detecting the temperature outside the room, and when the temperature detected by the outside air temperature detecting means is high, the cooling water supplied to the absorber and the condenser. The temperature of the cooling means is adjusted to be 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. An absorption type air conditioner comprising cooling water temperature adjusting means for adjusting the cooling means so that the cooling water temperature becomes even lower. 2. A heating part for heating the absorbing liquid, a regenerator for evaporating a refrigerant contained in the absorbing liquid by heating the absorbing liquid by the heating part, and a vaporized refrigerant generated in the regenerator for cooling and liquefying. A condenser, an evaporator for evaporating the liquefied refrigerant liquefied by the condenser under low pressure, an absorption refrigeration cycle including an absorber for absorbing the vaporized refrigerant evaporated by the evaporator into an absorption liquid, and the absorber The evaporator includes a cooling water circuit that circulates cooling water that cools the absorption liquid and cools the refrigerant in the condenser, and a cooling unit that is provided in the cooling water circuit and cools the cooling water by outdoor air. When the liquefied refrigerant is evaporated, the absorption heat is removed by removing the latent heat of vaporization and guiding the cooled heat medium to the indoor heat exchanger installed in the room. To Then, the absorption type cooling device is provided with a cooling load detecting means for detecting an indoor cooling load by the indoor heat exchanger, and when the cooling load detected by the cooling load detecting means is large, the absorber and the 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 outside air temperature detecting means is small, the cooling water is supplied to the absorber and the condenser. An absorption type air conditioner 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.