JPH11264625A - Cold water making device and refrigeration capacity control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cold water making device and a refrigeration capacity control method thereof for energy saving and low cost operations by combining a compression type refrigerator and an absorption type refrigerator. SOLUTION: A cold water making device is provided with a compression type refrigerator comprising a refrigerating cycle by connecting a compressor 2, a condenser 4, and an evaporator 1 by means of a refrigerant piping, and an absorption type refrigerator comprising a refrigerating cycle by connecting an evaporator 8, an absorber 9, a condenser 10, and a regenerator 11 by means of a piping and a passage. These refrigerators are connected in series by a cold water piping to flow cold water in the order of an evaporator 1 of the compression type refrigerator, and an evaporator 8 of the absorption type refrigerator. The temperature of the cold water flowing to the evaporator of the compression type refrigerator is detected by a cold water inlet temperature sensor 26, and a temperature controller 19 sets a set temperature of the cold water of the absorption type refrigerator inlet according to the detected temperature. And, the cold water temperature is detected by a temperature detection means 26 to control a refrigeration capacity of both refrigerators so that the temperature of the cold water detected by the temperature detection means 26 becomes the set temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing chilled water and a method for controlling the refrigerating capacity thereof, and more particularly to an apparatus for producing chilled water by combining a compression type refrigerator and an absorption type refrigerator.

[0002]

2. Description of the Related Art In a conventional apparatus for producing chilled water by finely combining a compression chiller and an absorption chiller, when the chilled water flows in series to two chillers, the absorption chiller and the compression chiller must be used. A control method has been adopted in which the chilled water outlet temperature of the compression refrigerator is kept constant by flowing the water in order. For example, 4-20377
No. 1 publication. As another conventional system, there is a system in which cold water flows in series in the order of a compression refrigerator and an absorption refrigerator. For example, JP-A-1-131859 is mentioned.

[0003]

In the former type of the conventional system, the temperature difference between the cooling water and the cooling water of the compression type refrigerator is not different from the case where the compression type refrigerator is used alone, and the absorption type refrigerator is used. Even if an operation system in which the compressor and the compressor are flowed in series, the power consumption per unit cooling capacity of the compressor is not reduced. In addition, since the absorption type refrigerator is arranged on the side where the cold water temperature is high, the heating amount per unit cooling capacity is reduced. However, as shown in FIG. 4, the reduction rate is smaller than the compression type refrigerator, In addition, since the operation corresponds to the peak load and the operation time is short, the energy saving effect is small.

[0004] On the other hand, in the latter conventional method, when the chilled water outlet temperature of the chilled water producing apparatus is kept constant, the absorption chiller supports a base load and operates for a long time under a high load. Correspondence, short-time operation. In this case, the compression type refrigerator powered by electric power having a high fixed cost ratio operates for a short time, and the overall energy cost increases.

When a centrifugal chiller is used as a compression chiller, if the temperature difference between the cooling water and the chilled water exceeds a design point by a certain amount or more, surging occurs and operation becomes impossible. Outlet temperature must be constant. For this reason, in order to keep the chilled water outlet temperature of the chilled water producing apparatus constant, an absorption chiller must be used as a base load. That is, in a conventional apparatus for producing chilled water by flowing chilled water in series to two chillers, a compression chiller and an absorption chiller, the characteristics of each chiller are not utilized and energy is not saved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned disadvantages of the related art, and has as its object to combine a compression type refrigerator and an absorption type refrigerator to save energy and reduce the operating cost of a chilled water producing apparatus and its refrigeration capacity control method. It is to realize.

[0007]

In order to achieve the above-mentioned object, a first feature of the present invention is that a compressor, a condenser, and an evaporator are connected by a cooling pipe to form a refrigeration cycle. And an absorption refrigerator in which a refrigerating cycle is configured by connecting an evaporator, an absorber, a condenser, and a regenerator by piping and a flow path, and the refrigerators are connected in series by cold water piping. In the chilled water production apparatus, which is connected to the chiller and the chiller flows in the order of the compression chiller and the absorption chiller, a means for detecting the temperature of the chilled water at the inlet of the absorption chiller, and the compression chiller than the absorption chiller load. Control means for setting the temperature of the cold water so as to increase the load on the refrigerator and controlling the refrigerating capacities of the two refrigerators so that the temperature of the cold water detected by the means becomes the set temperature. It is in.

A second feature of the present invention is that a compressor, a condenser, and an evaporator are connected by a refrigerant pipe to form a refrigerating cycle, and an evaporator, an absorber, and a condenser. An absorption refrigerator in which a refrigerating machine is connected by pipes and flow paths to form a refrigeration cycle. In the chilled water production device configured to flow in the order of the chiller, the compression chiller has a means for detecting a chilled water outlet temperature of the compression chiller, and the chilled water outlet temperature detected by this means is based on a load of the absorption chiller. Control means for controlling the refrigeration capacity of the compression chiller so as to reach a set temperature that increases the load of the compression chiller, wherein the absorption chiller adjusts the chilled water inlet temperature of the absorption chiller. Means for detecting,
Control means for controlling the refrigeration capacity of the absorption chiller so that the chilled water inlet temperature detected by the means is set to a temperature at which the load on the compression chiller is greater than the load on the absorption chiller. It is in.

A third feature of the present invention is that a compressor, a condenser, and an evaporator are connected by a refrigerant pipe to form a refrigerating cycle, and an evaporator, an absorber, and a condenser. A refrigerating machine connected by pipes and channels to form a refrigerating cycle, wherein the refrigerating machines are connected in series by a cold water pipe, and the cold water is compressed by the refrigerating machine and the absorption refrigerating machine. In the chilled water production device configured to flow in the order of the chiller, the compression chiller has a means for detecting a chilled water outlet temperature of the compression chiller, and the chilled water outlet temperature detected by this means is based on a load of the absorption chiller. Also has control means for controlling the refrigeration capacity of the compression chiller so as to reach a set temperature that increases the load on the compression chiller. The absorption refrigerator has means for detecting a chilled water inlet temperature of the absorption chiller, and the chilled water inlet temperature detected by the means makes the load of the compression chiller larger than the load of the absorption chiller. Control means for controlling the refrigerating capacity of the absorption refrigerator so as to attain such a set temperature. Further, means for detecting the cooling water temperature at the inlet or outlet of the compression refrigerator, and as the cooling water temperature detected by this means increases, the set temperature of the cooling water outlet of the compression refrigerator and the absorption refrigeration The set temperature of the chilled water inlet of the compressor is increased, and the set temperature of the chilled water outlet of the compression chiller and the set temperature of the chilled water inlet of the absorption chiller are reduced as the detected cooling water temperature decreases. Control means for performing the operation.

A fourth feature of the present invention is that a compressor, a condenser,
A compression-type refrigerator in which an evaporator is connected by a refrigerant pipe to form a refrigeration cycle, and an absorption in which an evaporator, an absorber, a condenser, and a regenerator are connected by pipes and flow paths to form a refrigeration cycle. A refrigeration capacity control method for a chilled water producing apparatus having a configuration in which the two chillers are connected in series by a chilled water pipe and chilled water flows in the order of a compression chiller and an absorption chiller. The refrigeration capacity of each refrigerator is controlled such that the temperature of the chilled water at the inlet of the refrigerator becomes a set temperature at which the load of the compression refrigerator becomes larger than the load of the absorption refrigerator.

According to the present invention having the above-described first, second, and fourth features, the structure is such that the chilled water used for cooling flows in the order of the compression chiller and the absorption chiller and further flows to the air conditioning load. The temperature of the chilled water at the outlet of the chiller (the chilled water at the inlet of the absorption chiller) is detected, and both chillers are controlled so that the detected temperature becomes the set temperature. The temperature is set so that the load is always higher than the load of the absorption refrigerator.

[0012] Generally, a compression refrigerator uses electricity, but the electricity fee tends to sharply decrease as the usage amount increases. In the present invention, the compression type refrigerator is used preferentially over the absorption type refrigerator, so that the total operation cost of both the refrigerators can be reduced.

Further, the air-conditioning load varies substantially in proportion to the atmospheric temperature, and the cooling water that receives waste heat from the refrigerator is generally cooled by a cooling tower (cooling tower). Raises and lowers according to atmospheric temperature. Therefore, there is a characteristic that the cooling water inlet temperature of the refrigerator rises and falls according to the air conditioning load.

According to the third aspect of the present invention, when the air-conditioning load is reduced, an intermediate position between the compression type refrigerator and the absorption type refrigerator is set according to the cooling water inlet or outlet temperature of the compression type refrigerator. Since the control is performed so as to lower the chilled water temperature, the compression chiller can be used for full load long-term operation, and the absorption chiller can be used for short-time peak load. Comparing the energy unit prices of electricity and gas, which are the energy sources of the refrigerator, for cooling air, the energy unit price of electricity for cooling is lower than that of gas when operated for a long time. Since it is common to operate a compression refrigerator with electricity and an absorption refrigerator with gas,
By performing such a full-load long-term operation of the compression refrigerator and using the compression refrigerator preferentially, the operation cost can be reduced.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A compression refrigerator and an absorption refrigerator are combined, and chilled water is flowed in series in the order of the compression refrigerator and the absorption refrigerator, and a cold water temperature intermediate between the compression refrigerator and the absorption refrigerator. And control each refrigerator so that its temperature becomes constant, the compression type refrigerator controls the chilled water outlet temperature to be constant. If it is below, the compression ratio of the compressor of the compression refrigerator will not be excessive. Also, when the outside temperature is not as high as in summer and the cooling water temperature is low in the middle period, etc., lower the set temperature of the controller that controls the compression refrigerator according to the temperature difference from the specified cooling water temperature. However, since the compression ratio of the compressor can be reduced to the design value or less, safe and stable operation can be performed.

A temperature detector of a control device for controlling each refrigerator is attached to a chilled water pipe between the two refrigerators, and the set temperature of the controller of the absorption refrigerator is set to the set temperature of the controller of the compression refrigerator. By setting the constant higher, the load is applied to the compression refrigerator first, the compressor cannot completely cool the compressor, and when the chilled water outlet temperature of the compression refrigerator becomes higher than the set temperature of the control device, the absorption refrigerator becomes Is activated, and a load is applied to the absorption refrigerator.

When the load is small, only the compression refrigerator is operated. When the load increases and the output of the compression refrigerator reaches 100%, the absorption refrigerator is started and the output of the compression refrigerator is reduced to 100%. When it is fixed to%, the compression type refrigerator is operated at full load, and the shortage is compensated for by the absorption type refrigerator.

[0018] Actually, the absorption chiller has a minimum refrigeration capacity for continuous operation. If the opening of the fuel control system of the absorption chiller or the output of the control device is less than the minimum capacity, the compression chiller is not used. Activate the control device, adjust the capacity of the two refrigerators to match the load, increase the load, the output of the compression refrigerator becomes 100%, the output of the absorption refrigerator exceeds the minimum capacity When it becomes, the output of the compression refrigerator becomes 100%
, And by operating the control device of the absorption chiller to an output corresponding to the load, the load can be preferentially applied to the compression chiller.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 denotes an evaporator of a compression refrigerator, 2 denotes a compressor, 3 denotes an electric motor, 4 denotes a condenser of the compression refrigerator, 5 denotes a compressor inflow refrigerant gas control burner, 6 denotes a control burner driving device, 7 is a refrigerant expansion valve of a compression refrigerator, 8 is an evaporator of an absorption refrigerator, 9 is an absorber of an absorption refrigerator, 10 is a condenser of an absorption refrigerator, and 11 is a regenerator of an absorption refrigerator. , 12 is a fuel control valve, 13 is a fuel control valve driving device, 14 is a fuel pipe, 15 is cooling water for a compression refrigerator, 16 is chilled water at a cooling device inlet, 17 is chilled water at an intermediate temperature, 18 is chilled water at a cooling device outlet,
19 is a temperature controller for a compression refrigerator, 20 is an absorption refrigerator inlet temperature controller, 21 is an absorption refrigerator outlet temperature controller,
22 is a compression chiller cooling water temperature controller, 23 is a selection calculator, 24 is a compression chiller cooling water outlet temperature sensor, 25 is an absorption chiller cooling water inlet temperature sensor, and 26 is a compression chiller cooling water inlet temperature. A sensor 27 is an absorption type refrigerator cold water outlet temperature sensor.

The chilled water 16 at the inlet of the cooling device first enters the evaporator 1 of the compression refrigerator, is cooled to become intermediate-temperature chilled water 17, enters the evaporator 8 of the absorption refrigerator, is further cooled, and is cooled at the outlet of the cooling device. It flows out as 18.

Temperature drop = Cooling water inlet temperature−Cooling water outlet temperature (1) With such a configuration, the temperature drop of the compression type refrigerator represented by the above equation (1) becomes small, and as shown in FIG.
The input power (required power) of a compression chiller decreases almost in proportion to the decrease in temperature drop, but the absorption chiller has the characteristic that the drive input decreases less than that of a compression chiller.
The drive input of the compression refrigerator and the absorption refrigerator can be extremely reduced.

The set value of the temperature controller 19 for the compression chiller which controls the intermediate temperature chilled water 17 which is the chilled water outlet temperature of the compression chiller to the set temperature is changed to the inlet of the cooling water 15 of the compression chiller. By changing according to the rate at which the temperature has changed, the temperature drop of the compression refrigerator can be kept constant,
The compression refrigerator can be operated efficiently.

When a turbo compressor is used as the compressor, if the cooling water outlet temperature is lowered when the cooling water inlet temperature is high, the compression ratio becomes higher, and the operating point is higher than the design point A as shown in FIG. , And there is a characteristic that the operation becomes impossible near the surging point, so that it is particularly important to keep the compression ratio below a certain value.

If a turbo compressor is used as the compressor and the maximum compression ratio of the turbo compressor is designed to be a compression ratio capable of cooling down to the temperature of the chilled water 18 at the cooling device outlet, the intermediate temperature chilled water 1
7 can be changed regardless of the cooling water temperature.
The operation is performed between the points C and D, and the operation is performed at the inefficient point D at full load, so that a large driving force is required.

If the turbo compressor is designed so as to correspond to a compression ratio at which the compression refrigerator and the absorption refrigerator cool to the temperature of the intermediate-temperature chilled water 17 when operating at full load, the characteristics of the turbo compressor are as follows. 6, the efficiency at the operating point D at full load greatly increases from d to d ′, and the power decreases substantially in proportion to the temperature drop. In order to prevent the compression ratio of the operating point of the turbo compressor from being higher than the point D in FIG. 6,
The set temperature of the temperature controller 19 for the compression refrigerator may be lowered according to the value at which the inlet temperature of the cooling water 15 of the compression refrigerator becomes lower than the design value.

The air conditioning load changes approximately in proportion to the atmospheric temperature.
Generally, cooling water is cooled by a cooling tower (not shown).
Cooling water temperature also rises and falls with atmospheric temperature. Therefore,
When the air-conditioning load decreases and the temperature of the cooling device inlet chilled water 16 returning from the air-conditioning load side decreases, the cooling water temperature also decreases, so that the cooling water 15 inlet temperature of the compression chiller decreases. Accordingly, by lowering the set temperature of the intermediate temperature chilled water 17 of the temperature controller 19 for the compression type refrigerator, the compression type refrigerator always operates at almost the full load.

The absorption chiller detects the temperature of the intermediate temperature chilled water 17 with an absorption chiller chilled water inlet temperature sensor 25, and is controlled by an absorption chiller chilled water inlet temperature controller 20 so that the temperature becomes constant. You. Therefore, when the load decreases, the temperature of the chilled water 18 at the cooling device outlet rises, and
Approaching temperature. With this control, the absorption chiller also reduces the temperature difference between the chilled water and the chilled water, so that the driving force is reduced and energy is saved.

The absorption chiller cold water inlet temperature controller 20 is also
As in the case of the compression refrigerator temperature controller 19, the set value can be changed depending on the temperature of the cooling water 15 of the compression refrigerator. The cold water inlet temperature controller 20 is set to a slightly higher temperature. By doing so, the compression refrigerator becomes full load first, the load is larger than the capacity of the compression refrigerator, and the temperature of the intermediate temperature chilled water 17 becomes higher than the set value of the temperature controller 19 for the compression refrigerator. , The absorption chiller chilled water inlet temperature controller 20 is activated, and the fuel pipe 1 of the absorption chiller is operated.
4 is operated so as to increase the fuel flowing through the compressor 4 and compensate for the capacity shortage of the compression refrigerator with respect to the load.

Cold water outlet temperature controller 21 of absorption refrigerator
Detects the temperature of the cooling device outlet chilled water 18 with the absorption chiller chilled water outlet temperature sensor 27, and when the temperature falls below the set value,
A control signal for closing the fuel control valve 12 is output. The selection calculator 23 compares the output signal of the absorption chiller chilled water inlet temperature controller 20 with the output signal of the absorption chiller chilled water outlet temperature controller 21 and selects a signal in the direction to close the fuel control valve 12. A signal is output to the fuel control valve driving device 13. Therefore, it is possible to prevent the temperature of the cooling device chilled water outlet 18 from falling below the set value, that is, to prevent overcooling.

FIG. 7 shows what has been described above. If the load is 100%, cool water is
Sending at 14 ° C. (point R), returning from the air conditioning load at 14 ° C. (point P). If the load is 0%, use cold water at 8 ° C for the air conditioning load.
And return from the air conditioning load at the same temperature of 8 ° C (Z
point).

When the load is 100%, the load is 1
The cold water returned at 4 ° C. (point P) is reduced by 3.5 ° C. at its maximum capacity to 10.5 ° C. at its maximum capacity (point Q), and the absorption chiller is further cooled to 10.5 ° C. at its maximum capacity. 2. From 5 ° C.
The temperature is lowered by 5 ° C to 7 ° C and sent to the air conditioning load (point R).

When the load decreases, the temperature of the chilled water returned from the air conditioning load becomes lower than when the load is 100% (for example, point S). Then, as in the case of 100% load, the maximum capacity of the compression refrigerator is lowered by about 3.5 ° C. to the point T, and the absorption refrigerator is cooled down to the point U by controlling the capacity, and sent to the air conditioning load. Therefore, in the present invention, a load is preferentially applied to the compression refrigerator.

When the load becomes about 46%, the absorption type refrigerator is stopped and the maximum capacity of the compression type refrigerator can be met (point V to point W). When the load further decreases, only the compression refrigerator is controlled in capacity (for example, from point X to point Y).

As shown in FIG. 7, the load is preferentially applied to the compression refrigerator in the entire operation range, and the compression refrigerator operates for a long time under a high load. The absorption chiller is operated only at the time of peak load, and is operated for a short time. In locations located at mid-latitudes such as Japan, the annual average cooling load in summer is about 40% of the peak load. Therefore, if the capacity of the compression chiller is selected to be 40% to 50% of the total capacity of the compression chiller and the absorption chiller, the compression chiller operates at about half of the annual operating time at full load. And the overall efficiency is increased.

FIG. 2 is a diagram showing another embodiment of the present invention. The outlet temperature of the cooling water 15 of the compression refrigerator is detected by a compression refrigerator cooling water outlet temperature sensor 28 and controlled in the same manner as in the embodiment of FIG.
9. The set value of the absorption chiller cold water inlet temperature controller 20 is
By changing according to the outlet temperature of the cooling water 15, FIG.
An effect 20 equivalent to that of the embodiment is obtained.

FIG. 3 is a diagram showing still another embodiment of the present invention. 1 uses an absorption refrigerator that uses steam as a driving source, and controls steam flowing through a steam pipe 31 by a steam control valve 29 and a steam control valve driving device 30. The same effect can be obtained. According to the present invention, the compression type chiller and the absorption type chiller are finely combined so as to cool the cold water in the order of the compression type chiller and the absorption type chiller, whereby the temperature difference of the compression type chiller (the cooling water inlet temperature) is reduced. -Cold water outlet temperature), and the driving power can be greatly reduced.

In general, since a compression refrigerator is driven by an electric motor, a reduction in drive power reduces the basic charge of electric power, which is a fixed cost, so that the running cost is greatly reduced. In addition, when the load decreases, the compression chiller is operated at full load for a long period of time by lowering the temperature of the chilled water at the intermediate temperature between the compression chiller and the absorption chiller in accordance with the cooling water temperature. Can be used for short-time peak load.
When such a driving is performed, particularly when the compression type refrigerator is driven by an electric motor, as shown in FIG. Can be reduced to In addition, FIG.
In the refrigerator of T, the electric power was assumed to be 1.0 kW / RT and the gas was assumed to be 0.65 Nm3 / RT.

In general, a compression chiller uses electricity. However, as an electricity charge tends to decrease sharply as the amount of use increases, the compression chiller is used preferentially over an absorption chiller, and the load is reduced. , It is possible to reduce the overall operating cost of both refrigerators.

[0039]

As described above, according to the present invention, when the air-conditioning load is reduced, the cooling water of the compression-type refrigerator is reduced by utilizing the characteristic that the change of the air-conditioning load and the temperature of the cooling water are linked. Controls to lower the chilled water temperature between the compression chiller and the absorption chiller according to the temperature, so use the compression chiller for long-term full load operation and use the absorption chiller for short-term peak load. be able to.

Further, when comparing the energy unit costs for cooling of electricity and gas, which are the energy sources of the refrigerator, the energy unit price for cooling electricity is lower than that of gas when operated for a long period of time. Since compression chillers are generally operated by electricity and absorption chillers are generally operated by gas, such compression chillers are operated at full load for a long period of time, and the compression chillers are used preferentially. As a result, the operating cost can be kept low.

[Brief description of the drawings]

FIG. 1 is a system diagram of a cold water production device according to one embodiment of the present invention.

FIG. 2 is a system diagram of a cold water production device according to another embodiment of the present invention.

FIG. 3 is a system diagram of a cold water production device according to still another embodiment of the present invention.

FIG. 4 is a graph showing a relationship between a temperature drop and an input to a refrigerator.

FIG. 5 is a graph showing a relationship between an operating point and a surging point of the turbo compressor.

FIG. 6 is a graph showing a relationship between an operating point and efficiency of the turbo compressor.

FIG. 7 is a graph showing a relationship between load sharing between a compression refrigerator and an absorption refrigerator and chilled water temperature.

FIG. 8 is a graph showing a relationship between a cooling energy unit price and an operation time.

[Explanation of symbols]

1 ... Evaporator of compression refrigerator, 2 ... Compressor, 3 ... Electric motor,
4: a condenser of a compression refrigerator, 5: a refrigerant gas control vane,
6 ... Control vane driving device, 8 ... Evaporator of absorption refrigerator
9: absorber, 10: condenser of absorption refrigerator, 11: regenerator, 12: fuel control valve, 13: fuel control valve driving device, 1
5: cooling water of a compression refrigerator, 16: cold water at the inlet of a cooling device,
17 ... Intermediate temperature cold water, 18 ... Cooling device outlet cold water, 19 ...
Temperature controller for compression refrigerator, 20: temperature controller for absorption refrigerator, 21 ... temperature controller for absorption refrigerator, 22 ...
Compression chiller cooling water temperature controller, 23 ... Selector, 24
Compression refrigerator cold water outlet temperature sensor, 25 ... absorption refrigerator cold water inlet temperature sensor, 26 ... compression refrigerator cold water inlet temperature sensor, 27 ... absorption refrigerator cold water outlet temperature sensor.

Claims (15)

[Claims] A compressor, a condenser, and an evaporator are connected by a refrigerant pipe to form a refrigerating cycle, and a compressor, an evaporator, an absorber, a condenser, and a regenerator are connected by piping and a flow path. An absorption refrigerator connected to form a refrigeration cycle, wherein the refrigerators are connected in series by a chilled water pipe, and chilled water flows in the order of a compression refrigerator and an absorption refrigerator. In the apparatus, temperature detecting means for detecting the temperature of the chilled water at the inlet of the absorption chiller, and setting the temperature of the chilled water so that the load of the compression chiller is larger than the load of the absorption chiller; Control means for controlling the refrigerating capacities of the two refrigerators so that the temperature of the chilled water detected by the detecting means becomes the set temperature. 2. The control means for controlling the refrigerating capacity of each refrigerator includes a control means for controlling a heat input amount of a regenerator of an absorption refrigerator, and a suction-side channel cross-sectional area of a compressor of a compression refrigerator. 2. The chilled water production apparatus according to claim 1, further comprising control means for controlling the rotation speed of the compressor or control means for controlling the rotation speed of the compressor. 3. A temperature detecting means for detecting a cooling water temperature at an inlet or an outlet of a compression refrigerator, and a set temperature of the cold water at the inlet of the absorption refrigerator as the detected cooling water temperature rises. Control means for controlling the set temperature of the chilled water at the inlet of the absorption chiller to be lowered as the detected chilled water temperature decreases. apparatus. 4. As the detected cooling water temperature increases, the set temperature of the cooling water at the inlet of the absorption refrigerator is increased,
As the detected cooling water temperature decreases, the control means for controlling to lower the set temperature of the cooling water at the inlet of the absorption refrigerator receives a signal of the cooling water temperature at the inlet or outlet of the compression refrigerator. 2. The chilled water production apparatus according to claim 1, further comprising a temperature controller for transmitting a control signal to control means for controlling the refrigerating capacity of each refrigerator. 5. A compression refrigerator in which a compressor, a condenser, and an evaporator are connected by a refrigerant pipe to form a refrigerating cycle, and an evaporator, an absorber, a condenser, and a regenerator are connected by piping and a flow path. An absorption refrigerator connected to form a refrigeration cycle, wherein the refrigerators are connected in series by a chilled water pipe, and chilled water flows in the order of a compression refrigerator and an absorption refrigerator. In the apparatus, the compression chiller includes a temperature detection unit that detects a chilled water outlet temperature of the compression chiller, and a chilled water outlet temperature detected by the temperature detection unit is higher than a load of the absorption chiller. Control means for controlling the refrigeration capacity of the compression chiller so that the set temperature increases the load of the chiller, wherein the absorption chiller detects a chilled water outlet temperature of the absorption chiller. Means and this cold water outlet temperature Control means for controlling the refrigeration capacity of the absorption chiller such that the chilled water inlet temperature detected by the discharge means is set to a temperature at which the load of the compression chiller is greater than the load of the absorption chiller. An apparatus for producing cold water, characterized in that: 6. The control means for controlling the refrigerating capacity of the compression type refrigerator includes a control means for controlling a suction-side flow path cross-sectional area of the compressor of the compression type refrigerator or a control means for controlling a rotation speed of the compressor. 6. The chilled water production apparatus according to claim 5, wherein the control means for controlling the refrigeration capacity of the absorption refrigerator includes a control means for controlling the heat input of the regenerator of the absorption refrigerator. 7. A means for detecting a cooling water temperature at an inlet or an outlet of a compression chiller, and as the detected cooling water temperature rises, a set temperature and an absorption of a chilled water outlet of the compression chiller are set. Raise the set temperature of the chilled water inlet of the type refrigerator, as the detected cooling water temperature decreases,
The chilled water production apparatus according to claim 5, further comprising control means for controlling a set temperature of a chilled water outlet of the compression chiller and a set temperature of the absorption chiller chilled water inlet. . 8. A control means for controlling so as to decrease the set temperature of the chilled water outlet of the compression chiller and the set temperature of the chilled water inlet of the absorption chiller as the detected cooling water temperature increases. It has a temperature controller which receives the signal of the cooling water temperature of the entrance of a compression type refrigerator, or an exit, and transmits a control signal to control means which controls the refrigerating capacity of each refrigerator. 7. The cold water production device according to 7. 9. A control means for controlling the compression refrigerator to operate at full load when the load of the absorption refrigerator is larger than the lower limit of the capacity control of the absorption refrigerator. 6. The cold water production device according to any one of 1 to 5. 10. A means for detecting a cooling water inlet temperature of an absorption refrigerator and outputting a signal, a means for detecting a cooling water outlet temperature of an absorption refrigerator and outputting a signal, and receiving these two types of signals. A comparison operation means for comparing and selecting a signal having a lower temperature and outputting a signal; and a refrigeration unit for the absorption chiller which receives the signal from the comparison operation means and prevents the chilled water outlet temperature of the absorption chiller from abnormally lowering. 6. The chilled water production apparatus according to claim 1, further comprising control means for controlling a capacity. 11. The maximum refrigeration capacity of a compression refrigerator is 40% to 50% of the total refrigeration capacity of the maximum refrigeration capacity of a compression chiller and the maximum refrigeration capacity of an absorption refrigerator. 6. The chilled water production device according to claim 1, wherein: 12. A compressor having a refrigeration cycle in which a compressor, a condenser, and an evaporator are connected by refrigerant piping, and an evaporator, an absorber, a condenser, and a regenerator connected by piping and a flow path. An absorption refrigerator connected to form a refrigeration cycle, wherein the refrigerators are connected in series by a chilled water pipe, and chilled water flows in the order of a compression refrigerator and an absorption refrigerator. In the apparatus, the compression refrigerator has means for detecting a chilled water outlet temperature of the compression chiller, and the chilled water outlet temperature detected by this means increases the load of the compression chiller more than the load of the absorption chiller. Control means for controlling the refrigeration capacity of the compression chiller so as to reach the set temperature, wherein the absorption chiller detects a chilled water inlet temperature of the absorption chiller, Cold water detected by this means Control means for controlling the refrigeration capacity of the absorption chiller so that the temperature becomes a set temperature such that the load on the compression chiller is greater than the load on the absorption chiller. Means for detecting the cooling water temperature at the inlet or outlet of the machine, and as the cooling water temperature detected by this means increases, the set temperature of the chilled water outlet of the compression chiller and the chilled water inlet of the absorption chiller Control means for increasing the set temperature and controlling the set temperature of the chilled water outlet of the compression chiller and the set temperature of the chilled water inlet of the absorption chiller as the detected cooling water temperature decreases. An apparatus for producing cold water, comprising: 13. A compression refrigerator in which a refrigerating cycle is constituted by connecting a compressor, a condenser and an evaporator by a refrigerant pipe, and an evaporator, an absorber, a condenser and a regenerator by piping and a flow path. An absorption refrigerator connected to form a refrigeration cycle, wherein the refrigerators are connected in series by a chilled water pipe, and chilled water flows in the order of a compression refrigerator and an absorption refrigerator. In the method for controlling the refrigerating capacity of the apparatus, the refrigeration of each refrigerator is set so that the temperature of the chilled water at the inlet of the absorption refrigerator becomes a set temperature that makes the load of the compression refrigerator greater than the load of the absorption refrigerator. A method for controlling a refrigeration capacity of a chilled water producing apparatus, comprising controlling a capacity. 14. A control method for controlling the refrigerating capacity of each refrigerator includes a control means for controlling a heat input amount of a regenerator of an absorption refrigerator, and a control of a cross-sectional area of a suction port of a compressor of the compression refrigerator. The refrigeration capacity control method for a chilled water production apparatus according to claim 13, wherein the control is performed by control means for controlling the rotation speed of the compressor. 15. As the cooling water temperature at the inlet or outlet of the compression refrigerator increases, the set temperature of the cooling water at the inlet of the absorption refrigerator increases, and as the cooling water temperature decreases, the cooling water temperature decreases. The refrigeration capacity control method for a chilled water production apparatus according to claim 13, wherein the temperature is set so as to decrease.