KR20060045331A - Absorption refrigerator - Google Patents

Abstract

 An object of the present invention is to enable power energy reduction of a cooling water pump while suppressing a decrease in the amount of heat recovered from the heat treatment fluid.

Arrangement of the coolant for measuring the temperature sensor 42 Based on the condenser outlet side temperature A, the frequency α 의 of the electric power supplied to the coolant pump 12 is calculated, and the opening degree sensor (not shown) is measured. When the opening degree X of the heat-transfer tube 3A side of the flow control valve 13 is 95% or more, for example, when the heat-transfer tube 3A side is full open or a valve open state close to a full opening, a temperature sensor ( 43 is calculated based on the outlet temperature B of the array fluid, and the frequency β 전력 of the electric power supplied to the coolant pump 12 is calculated. When α≥β, αβ is applied to the coolant pump 12. Power supply, otherwise, the power of β㎐ is supplied and when the opening degree X on the heat transfer pipe 3A side of the flow control valve 13 is not sufficiently large, heating of the absorbing liquid by the array fluid is no longer present. Need not be increased or the amount of cooling water should be increased. The frequency of power to be supplied to the cooling water pump (12) to obtain from the state was to install the controller 50 to supply the power to α㎐ view a safety factor but even at the lowest, the cooling water pump 12 is provided.

Coolant Pump, Flow Control Valve, Heat Pipe, Controller, Temperature Sensor

Description

Absorption Chillers {ABSORPTION REFRIGERATOR}

1 is an explanatory view of an absorption refrigerator of the present invention.

Fig. 2 is an explanatory diagram showing basic data stored in the memory of the controller, (a) is an explanatory diagram showing the relationship between the temperature of the condenser outlet side of the cooling water and the power frequency supplied to the cooling water pump, and (b) is the arrangement fluid outlet Explanatory drawing which shows the relationship between the side temperature and the electric power frequency supplied to a cooling water pump.

3 is an explanatory diagram showing a control program stored in the memory of the controller;

4 is an explanatory diagram showing another control program stored in the memory of the controller;

5 is an explanatory diagram of a prior art;

<Explanation of symbols for the main parts of the drawings>

1: high temperature regenerator

1A: Gas Burner

2: low temperature regenerator

3: array player

3A: heat pipe

4: condenser

5: array condenser

6: evaporator

6A: heat pipe

7: absorber

8: low temperature heat exchanger

9: high temperature heat exchanger

10: refrigerant pump

11A, 11B: Absorbent Pump

12: coolant pump

13: flow control valve (three-sided valve)

14 to 17: valve opening and closing

18 to 23 absorber tube

24 to 29: refrigerant pipe

30: array fluid supply pipe

31: Bypass tube

32: cold and hot water pipe

33: cooling water pipe

34: equalization tube

41 to 48: temperature sensor

50: controller

100, 100X: Absorption Chiller

This invention relates to the absorption chiller which uses the heat | fever etc. supplied from another installation as a heat source of the regenerator which heats an absorption liquid and evaporates and separates a refrigerant | coolant.

As this type of absorption refrigerator, for example, as shown in Fig. 5, a gas burner 1A is a regenerator that heats and boils an absorbing liquid to evaporate and separates the refrigerant conveyed to the evaporator 6 and concentrates and regenerates the absorbing liquid. The high temperature regenerator 1 which makes combustion heat which generate | occur | produces in the heating source of an absorption liquid, the low temperature regenerator 2 which uses the refrigerant vapor supplied from the high temperature regenerator 1 as a heating source of absorption liquid, and other waste heat generation systems, etc. Absorption refrigerator 100X comprised with the array regenerator 3 which uses the array fluid supplied from installation as a heating source is well known (for example, refer patent document 1).

In the drawing, reference numeral 4 denotes a condenser provided in the low temperature regenerator 2 so that refrigerant vapor evaporated and separated from the absorbent liquid in the low temperature regenerator 2, 5 is a refrigerant evaporated and separated from the absorbent liquid in the array regenerator 3; The condenser arranged in parallel with the regenerator 3 to allow steam to flow therein, 7 is an absorber provided in the evaporator 6 so that refrigerant vapor evaporated in the evaporator 6 can be introduced, 8 is a low temperature heat exchanger, and 9 is a high temperature. Heat exchanger, 10 is a refrigerant pump, 11A and 11B are absorbing liquid pumps, 13 is a three-way valve, a flow control valve, 14 to 17 valve opening and closing, 18 to 23 absorbing liquid pipe, 24 to 29 refrigerant pipe, 30 is arranged The fluid supply pipe, 31 is a bypass pipe, 32 is a hot and cold water pipe, 33 is a cooling water pipe, 34 is a pressure equalizing pipe, and as shown in Fig. 5, the pipe is connected to the heat transfer pipe 6A installed in the evaporator 6 through a pipe wall. Cold and hot water cooled and / or heated to a predetermined temperature It is comprised so that circulation supply to the heat load which is not shown through the pipe 32 is possible.

In the absorption chiller 100X having the above-described configuration, the heat source receives combustion heat from burning natural gas or the like with the gas burner 1A, and an array fluid supplied from another facility such as a waste heat generation system through the array fluid supply pipe 30. As a result, the absorption liquid is heated, the refrigerant is evaporated and separated from the absorption liquid, and the absorption liquid is concentrated and regenerated, so that the thermal efficiency is high. Therefore, there is an advantage in that it is resource-saving and can reduce carbon dioxide emission.

[Patent Document 1] Japanese Patent Application Laid-open No. Hei 8-54153

However, in the absorption chiller disclosed in Patent Literature 1, since the cooling water pump installed in the cooling water pipe was operated at a constant speed, when the heat load was small, there was a possibility of reducing the power energy by lowering the rotation speed of the cooling water pump. Since the control reduces the flow rate that can be recovered from the array fluid, in practice, the cooling water fluid flow rate control is not carried out (in the absorption chiller that does not use the array fluid for the heat source, the cooling water or cooling water supplied from the evaporator to the heat load). The technique of controlling the rotation speed of a cooling water pump based on a state is well-known, for example, Unexamined-Japanese-Patent No. 8-159596.

Therefore, it is necessary to reduce the power energy of the cooling water pump because the amount of heat that can be recovered from the array fluid is not reduced as much as possible. As such, it was necessary to make it possible without complicating control.

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, the present invention provides an arrangement fluid which is connected to an array supply pipe and heats an absorbent liquid that absorbs a refrigerant, and is supplied from another facility to a part or all of a heat source for concentrating and regenerating the absorbent liquid by evaporating and separating the refrigerant. Or cooling water in which the cooling water pump interposed in the cooling water pipe piped via the absorber and the condenser is rotated by the inverter motor, and is cooled by the evaporator and circulated to the heat load. Determining the frequency of power supplied to the inverter motor based on the state of the coolant flowing through the pipe; determining the frequency of power supplied to the inverter motor based on the state of the array fluid supplied from other equipment; Selecting a higher frequency within the determined frequency, and The main feature is that a control program having a process of supplying electric power to the inverter motor to control the rotation speed of the coolant pump is stored in the memory of the control means.

The array supply pipe is connected to heat the absorbent liquid that absorbs the refrigerant, and the array fluid supplied from another facility is used for a part or all of the heat source for evaporating and separating the refrigerant to concentrate and regenerate the absorbent liquid, and the pipe is connected through the absorber and the condenser. In an absorption chiller in which a cooling water pump interposed in a cooling water pipe is controlled by an inverter motor, the power supplied to an inverter motor based on a state of cooling water flowing through a brine or cooling water pipe cooled by an evaporator and circulated to a heat load. Determining a frequency of the power, determining a frequency of power supplied to the inverter motor based on the state of the array fluid supplied from other equipment, selecting a higher frequency within the determined frequency, and The rotation speed of the coolant pump by supplying power of the selected frequency to the inverter motor The control means includes a control program having a step of controlling and a control program for supplying electric power of the maximum frequency to the inverter motor when the temperature or pressure in the regenerator reaches a predetermined value to operate the coolant pump at the maximum rotational speed. One absorption chiller.

<First Embodiment>

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of this invention is described in detail based on FIG. The absorption chiller 100 of the present invention illustrated in FIG. 1 is an absorption chiller capable of circulating and supplying cold water or hot water as brine to a heat load (not shown) by using an emulsified lithium (LiBr) aqueous solution in an absorbent liquid and water in a refrigerant. . In addition, in order to make understanding easy, the same code | symbol is attached | subjected to FIG. 1 in the part which has a function similar to the part demonstrated in the said FIG.

As can be seen from the above figure, the absorption chiller 100 of the present invention shown in FIG. 1 is the same as the absorption chiller 100X shown in FIG. Then, the temperature sensor 41 provided on the evaporator 6 exit side of the cold / hot water pipe 32 exchanges heat with the refrigerant through the pipe wall of the heat transfer tube 6A in the evaporator 6, and the latent heat when the refrigerant evaporates. It is comprised so that the temperature of the cold / hot water which cooled by and discharged from the evaporator 6 can be measured.

In addition, the temperature sensor 42 provided on the outlet side of the condenser 5 of the cooling water pipe 33 cools the absorber 7, the condenser 4, and the condenser 5, respectively. It is comprised so that the exit temperature of the cooling water discharged from 5) can be measured.

In addition, by the temperature sensor 43 provided in the array fluid supply pipe 30, the absorption liquid is heated in the array regenerator 3 to evaporate and separate the refrigerant, and the array fluid discharged from the array regenerator 3 by concentrating the absorption liquid; It is comprised so that the exit temperature of the arrangement fluid which flows through and flows through the bypass pipe 31 can be measured.

The temperature sensor 44 installed in the high temperature regenerator 1 is configured to be heated by the gas burner 1A to evaporate and separate the refrigerant, and to measure the temperature of the concentrated absorbent liquid.

Moreover, based on the temperature etc. which measured the temperature sensors 41-44, the gas burner 1A, the refrigerant pump 10, the absorbent liquid pumps 11A, 11B, the coolant pump 12, and the flow control valve 13 The controller 50 is also provided to control the &lt; RTI ID = 0.0 &gt;

In the absorption chiller 100 having the above-described configuration, the cooling water flows through the cooling water pipe 33 while the valve opening and closing 14 to 17 are closed, and the natural gas or the like is burned by the gas burner 1A, and the arrangement is performed. The absorbent liquid pumps 11A and 11B are operated by flowing some array fluid such as high temperature / high pressure steam and high temperature water supplied from a waste heat generation system or the like to the heat transfer tube 3A installed in the array regenerator 3 through the fluid supply pipe 30. The absorber 7 absorbs the refrigerant and transfers the absorbent liquid stored in the absorbent liquid reservoir to the array regenerator 3 from the array regenerator 3 to the high temperature regenerator 1, and the refrigerant vapor evaporated and separated from the absorbent liquid and the refrigerant vapor. Is separated and the absorbent liquid having a high concentration of the absorbent liquid is obtained in the array regenerator 3 and the high temperature regenerator 1.

The high temperature refrigerant vapor generated by the high temperature regenerator (1) enters the low temperature regenerator (2) through the refrigerant pipe (24), and is concentrated to the high temperature regenerator (1) to absorb the high temperature heat exchanger (9) by the absorbent liquid pipe (20). The absorption liquid which entered the low temperature regenerator 2 via heat is heated, condensed by heat radiation, and enters the condenser 4.

In addition, the refrigerant vapor separated from the absorbing liquid by heating in the low temperature regenerator 2 enters the condenser 4, and heat-exchanges with the cooling water flowing in the cooling water pipe 33 to condense the liquid to form the refrigerant pipe 24. It is made together with the refrigerant supplied by condensation and enters the evaporator 6 through the refrigerant pipe 26.

The high temperature refrigerant vapor generated by the array regenerator 3 also enters the array condenser 5, heat exchanges with the cooling water flowing in the cooling water pipe 33 to liquefy condensation, and the evaporator 6 through the refrigerant pipes 27 and 26. Enter

The refrigerant liquid entering the evaporator 6 and stored in the refrigerant liquid reservoir is sprayed by the operation of the refrigerant pump 10 on the heat transfer pipe 6A to which the cold / hot water pipe 32 is connected, and circulated and supplied through the cold / hot water pipe 32. It evaporates by heat exchange with water, and cools the water flowing inside the heat transfer pipe 6A.

The refrigerant evaporated by the evaporator 6 enters the absorber 7, is heated by the low temperature regenerator 2, and the refrigerant is evaporated and separated, and the concentration of the absorbent liquid is further increased by the absorbed liquid, that is, the absorbent liquid tube 21. It is supplied via the low temperature heat exchanger 8, and is absorbed by the rich absorbent liquid sprayed from the upper side.

Absorbent liquid whose absorbent refrigerant is absorbed by the absorber 7 and whose concentration is thinned, that is, the lean absorbent liquid, is transferred to the array regenerator 3 via the low temperature heat exchanger 8 by the operation of the absorbent liquid pump 11A. The refrigerant is evaporated and separated by the array fluid supplied from the array fluid supply pipe 30, concentrated, and transferred to the high temperature regenerator 1 by the operation of the absorbent liquid pump 11B.

When the operation is performed as described above, since the cold water cooled by the heat of vaporization of the refrigerant in the heat transfer pipe 6A in the evaporator 6 can be circulated and supplied to the heat load (not shown) through the cold / hot water pipe 32, Cooling operation can be performed.

In addition, combustion of natural gas or the like to the gas burner 1A is prioritized to supply the array fluid from the array fluid supply pipe 30 to the heat transfer pipe 3A. That is, in the memory (not shown) of the controller 50, the flow rate control valve 13 is first controlled so that the temperature of the cold / hot water measuring the temperature sensor 41 is lowered to a predetermined set temperature, for example, 7 ° C. Even when the amount of the array fluid flowing through 3A is maximized, when the temperature of the cold / hot water measuring the temperature sensor 41 does not fall to 7 ° C of the set temperature, the absorber is heated by the gas burner 1A to obtain a high temperature. Even in the regenerator 1, the refrigerant vapor is generated and the concentrated liquid is regenerated and the absorbing liquid is controlled so that the temperature of the hot and cold water cooled by the evaporator 6 and discharged to the cold / hot water pipe 32 becomes 7 ° C of the set temperature. If the temperature of the cold / hot water measuring the temperature sensor 41 does not rise to 7 ° C of the set temperature even when the heating amount by 1A is minimized, the heating by the gas burner 1A is stopped, and the flow control valve ( 13) to the heat transfer pipe (3A) A control program is stored for throttling the supply amount of the fluid to be arranged, and for the temperature of the cold / hot water cooled by the evaporator 6 and discharged to the cold / hot water pipe 32 to be 7 ° C. of the set temperature.

In addition, in the memory (not shown) of the controller 50, the power supplied to the cooling water pump 12 when the temperature of the condenser outlet side of the cooling water measured by the temperature sensor 42 is higher than the set temperature (for example, 37.5 ° C.). To increase the frequency of the cooling water to increase the cooling water flow rate, and when it is lower than the set temperature, reduce the frequency of the electric power supplied to the cooling water pump 12 to reduce the cooling water flow rate, and to maintain the constant temperature of the condenser outlet side of the cooling water. For example, the refrigerant is evaporated and separated by heating the absorbing liquid with the relational expression (a function or a table, etc., appropriate method can be employed) and the temperature sensor 43 measured, that is, the array regenerator 3 shown in FIG. The temperature of the array fluid in which the absorbing liquid is concentrated and discharged from the array regenerator 3 and the array fluid which has flown through the bypass pipe 31 and flows is greater than the set temperature (for example, 80 ° C.). When it is high, the frequency of the power supplied to the cooling water pump 12 is increased to increase the flow rate of the cooling water, and when it is lower than the set temperature, the frequency of the power supplied to the cooling water pump 12 is lowered to reduce the amount of cooling water and the outlet of the array fluid. In order to keep the side temperature constant, for example, a relational expression (a suitable method such as a function or a table can be employed) shown in Fig. 2B is stored.

In addition, the control program shown in FIG. 3 is also stored in a memory (not shown) of the controller 50. Accordingly, the temperature condenser outlet side temperature A of the cooling water is measured by the temperature sensor 42 during the operation of the absorption refrigerator 100 (step S1), and the measured temperature of the condenser outlet side A of the cooling water is measured. From the relational expression shown to 2 (a), the frequency (alpha) of the electric power supplied to the cooling water pump 12 is calculated (step S2).

In addition, the opening degree X of the heat exchanger tube 3A side of the flow control valve 13 is measured by the opening degree sensor which is not shown in figure (step S3), and the measured opening degree X is 95%, for example. It is determined whether or not it is abnormal (step S4).

In step S4, when YES, that is, the opening degree of the heat exchanger tube 3A side of the flow control valve 13 is a full opening or a valve opening state close to a full opening, it transfers to step S5 and the arrangement fluid by the temperature sensor 43 is carried out. The outlet side temperature B is measured, and the frequency β of the power supplied to the coolant pump 12 is determined from the outlet temperature B of the measured arrangement fluid and the relationship shown in FIG. It is calculated (step S6).

In step S7, the frequency α㎐ calculated in step S2 is compared with the frequency β 스텝 calculated in step S6, and when α ≧ β, the flow advances to step S8 and the coolant pump 12 Power is supplied to the cooling system, otherwise, the flow advances to step S10 to supply cooling power pump 12 to the cooling water pump 12.

On the other hand, in the case of NO in Step S4, that is, when the opening degree of the heat transfer pipe 3A side of the flow control valve 13 is not large enough, the heating of the absorbing liquid by the array fluid does not need to be increased more than now, so that the amount of cooling water There is no need to increase either. Therefore, since the frequency of the electric power supplied to the cooling water pump 12 calculated | required from the state of an arrangement fluid may be minimum, the cooling water pump 12 is supplied with the electric power of (alpha) ㎐ computed in step S2 in consideration of a safety factor. .

Therefore, in the absorption chiller 100 of the present invention, for example, since the heat load is small, the heating by the gas burner 1A is stopped, and the array fluid supplied to the heat transfer pipe 3A through the array fluid supply pipe 30. Even when the refrigerant is produced and the concentrated regeneration of the absorbent liquid is performed only by heating, the temperature of the cold water refluxed from the heat load to the evaporator 6 through the cold / hot water pipe 32 is small, and the heat of vaporization of the refrigerant to the heat transfer pipe 6A. The temperature of cold water cooled by this and discharged to the cold / hot water pipe 32 falls.

Therefore, since the temperature sensor 41 measures temperature lower than 7 degreeC of a preset temperature, the amount of heat which inputs into the array regenerator 3 by the controller 50 is suppressed. That is, the opening degree of the heat exchanger tube 3A side of the flow control valve 13 is reduced to less than 95% so that the amount of the array fluid passing the bypass regenerator 3 and passing through the bypass tube 31 is increased. .

At the low load, the absorber 7, the condenser 4, and the condenser 5 are cooled to measure the temperature of the coolant flowing through the coolant pipe 33, that is, the temperature of the array condenser outlet side ( Since A) is also lowered, the frequency [alpha] of the power supplied to the cooling water pump 12 determined based on the condenser outlet temperature A of the cooling water is also low.

And, by the control program shown in Fig. 3, since the coolant pump 12 is supplied with and driven at a low frequency, the power consumed by the coolant pump 12 is reduced.

In addition, the power frequency α㎐ determined on the basis of the condenser outlet temperature A of the cooling water and the opening degree of the heat transfer tube 3A side of the flow control valve 13 are 95% or more, and the heat transfer tube 3A. When the side is in full open or near full open, the power of the larger frequency within the power frequency β 주파수 determined based on the outlet side temperature B of the array fluid is supplied to the cooling water pump 12, and the flow rate When the opening degree of the heat transfer pipe 3A side of the control valve 13 is less than 95%, it is not necessary to increase the heating of the absorbing liquid by the array fluid more than now, and when it is not necessary to increase the amount of cooling water, a sufficient amount is supplied. Since the power frequency α㎐ determined on the basis of the condenser outlet side temperature A of the cooling water at which the temperature is also lowered is supplied to the cooling water pump 12, the condenser outlet side temperature A of the cooling water is also Outlet side of array fluid FIG. (B) also do not higher than the set temperature.

In addition, the control program shown in FIG. 4 is also stored in the memory (not shown) of the controller 50. Therefore, when the temperature of the absorbing liquid in the high temperature regenerator 1 measuring the temperature sensor 44 exceeds the set temperature (for example, 155 ° C), the coolant pump 12 is operated at the maximum rotational speed so that the coolant flow rate is forced. Because of this, it is returned to the 100% flow rate, so that frequent safety stops due to abnormal high temperature of the high temperature regenerator 1 are avoided (it will not be described in detail, but it is dangerous when the temperature sensor 44 measures a temperature exceeding the set temperature). Since the conventionally known safety device equipped to avoid the problem is provided as it is, even when the cooling water flow rate is forcibly driven at 100% flow rate, when the temperature sensor 44 measures a high temperature exceeding the set temperature, the conventionally known safety device is used. The device has been activated and safely stopped. And the said excellent effect can be achieved by simple control of about several tens of steps.

In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the meaning described in the claim.

For example, instead of the condenser outlet side temperature A of the cooling water measuring the temperature sensor 42, the cooling water pump 12 is operated similarly to the above using the cooling water temperature of the condenser outlet side measuring the temperature sensor 45. The frequency of the power of cooling water supplied to the cooling water pump 12 by calculating the frequency of the electric power to be supplied to the electric power and the electric power of the frequency determined from the electric power frequency β㎐ calculated on the basis of the electric power frequency and the temperature of the outlet fluid outlet side B. As a control, the same effects as described above can be obtained.

In addition, instead of the temperature condenser outlet side temperature A of the cooling water measuring the temperature sensor 42, the water absorber which measures the cooling water array condenser exit side temperature A and the temperature sensor 46 installed in the absorber inlet side. Using the temperature difference with the cooling water temperature at the inlet side, the frequency of the power supplied to the cooling water pump 12 is obtained in the same manner as above, and the power frequency calculated based on the power frequency and the array fluid outlet side temperature B ( The same effect as the above can be exhibited even if the power of the frequency determined from β㎐) is controlled as the flow rate of the cooling water supplied to the cooling water pump 12.

Further, instead of the condenser outlet temperature A of the cooling water measuring the temperature sensor 42, it is provided at the evaporator outlet temperature of the cold / hot water measuring the temperature sensor 41 and the evaporator inlet side of the cold / hot water pipe 32. The temperature difference from the cold / hot water temperature at the inlet side of the evaporator measuring one temperature sensor 47, or the magnitude of the heat load (not shown) in which cold water is circulated and supplied through the cold / hot water pipe 32, is measured using appropriate means, Using any one of these data, the frequency of the electric power to be supplied to the cooling water pump 12 is obtained as described above, and the electric power frequency β㎐ calculated based on the electric power frequency and the temperature of the outlet fluid outlet side B. Even if the power of the frequency determined from the above is controlled as the flow rate of the cooling water supplied to the cooling water pump 12, the same effects as described above can be obtained.

Instead of the array fluid outlet side temperature B for measuring the temperature sensor 43, the inlet side temperature of the array fluid for measuring the temperature sensor 48 provided on the inlet side of the array regenerator 3 is used. It is also possible to control the flow rate of cooling water.

Instead of the temperature of the absorbing liquid in the high temperature regenerator 1 measuring the temperature sensor 44, the pressure in the high temperature regenerator 1 measuring the pressure sensor (not shown) provided in the same manner as the temperature sensor 44 is used. It is also possible to control the flow rate of cooling water.

In addition, the lean absorbent liquid which absorbed the refrigerant | coolant with the absorber 7 and the density | concentration fell, is first conveyed and concentrated to the array regenerator 3, the concentrated absorber liquid is conveyed to the low temperature regenerator 2, and is concentrated, and finally high temperature The absorbing liquid pipe may be piped so as to be conveyed to the regenerator 1 and concentrated. The lean absorbent liquid which absorbs the refrigerant by the absorber 7 and has a reduced concentration branches to the high temperature regenerator 1 and the array regenerator 3 and returns the high temperature. The absorbent liquid pipe may be piped so that the absorbent liquid concentrated by the regenerator 1 and the array regenerator 3 is conveyed to the low temperature regenerator 2 and concentrated.

In addition, the refrigerant pipe 29 through which the valve opening and closing 17 is interposed may be provided between the downstream side of the refrigerant pump 10 of the refrigerant pipe 28 and the absorber 7.

In addition, the flow control valve 13 may be provided at a position of a branch of the array fluid supply pipe 30 and the bypass pipe 31 on the array fluid inlet side.

In the absorption chiller of the present invention, since the rotation speed of the coolant pump is controlled based on the state of the array fluid supplied from the brine, the coolant, and other equipment, the power for conveying the coolant is reduced. In addition, it is achieved by simple control.

Claims (2)

An array fluid supply pipe is connected to heat the absorbent liquid that absorbs the refrigerant, and the array fluid supplied from other facilities is used for part or all of the heat source for evaporating and separating the refrigerant to concentrate and regenerate the absorbent liquid. In an absorption chiller, in which a cooling water pump interposed in a cooling water pipe piped via a gas is controlled by an inverter motor, Determining the frequency of the power supplied to the inverter motor based on the state of the cooling water flowing through the brine or cooling water pipe cooled by the evaporator and circulated to the heat load, and based on the state of the array fluid supplied from other equipment Determining a frequency of power supplied to the inverter motor, selecting a higher frequency within the determined frequency, and supplying power of the selected frequency to the inverter motor to control the rotation speed of the cooling water pump. Absorption chiller, characterized in that the control program is stored in the memory of the control means. The apparatus according to claim 1, wherein a means for measuring the temperature or pressure in the regenerator is provided, and when the data measuring the measuring means reaches a predetermined value, power of the maximum frequency is supplied to the inverter motor to rotate the cooling water pump at the maximum rotation. An absorption chiller, characterized in that the control means has a function of driving with water.

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