KR100307071B1 - Cold water producing refrigerating apparatus and method of controlling cooling capacity thereof - Google Patents

Abstract

The present invention relates to a cold water production apparatus for producing cold water by a freezer. The present invention flows cold water in the order of the evaporator 1 of the compressed refrigerator, and the evaporator 8 of the absorption refrigerator, and simultaneously detects the absorption chiller inlet temperature (compression freezer outlet temperature) of the cold water. Based on this, each of the refrigerators is controlled so that the load of the compressed refrigerator is larger than that of the absorption refrigerator.

By this configuration, it is possible to preferentially apply a load to the compression type refrigerator and make energy saving operation by utilizing the characteristics of each refrigerator.

Description

COLD WATER PRODUCING REFRIGERATING APPARATUS AND METHOD OF CONTROLLING COOLING CAPACITY THEREOF}

In the conventional apparatus for producing cold water by combining a compressed refrigerator and an absorption refrigerator, when cold water flows in series in two refrigerators, a control is performed in which the cold water outlet temperature of the compressed refrigerator is constant by flowing in the order of the absorption refrigerator and the compressed refrigerator. I was taking the way. For example, Japanese Unexamined Patent Application Publication No. 4-203771 can be given.

In the conventional method described above, the unit cooling of the compressed refrigerator is performed even if the temperature difference between the cooling water and the cold water of the compressed refrigerator is the same as that of using the compressor alone. Power consumption per capability does not decrease. In addition, since the absorption chiller is disposed at a higher side of the cold water temperature, the amount of heating per unit cooling capacity decreases, but as shown in FIG. 4, the reduction ratio is smaller than that of the compression chiller, and the operation corresponds to peak load, and the operation time is short. Therefore, the energy saving effect is small.

Another conventional method is to flow cold water in series in the order of a compression freezer and an absorption freezer. For example, Japanese Unexamined Patent Application Publication No. 58-129172. In this manner, when the cold water outlet temperature of the cold water production apparatus is made constant, the absorption chiller becomes a base rod-compatible, a long time high load operation, and the compression chiller becomes a peak load-response, a short time operation. In this case, a compression type refrigerator using power having a high fixed cost ratio as a power source is operated for a short time, and thus there is a drawback that the total energy ratio is increased.

In the case of using a turbo freezer for a compressed refrigerator, if the temperature difference between the coolant and the cold water exceeds a predetermined point, surging occurs and the operation cannot be performed, so the cold water outlet temperature of the turbo freezer must be made constant. For this reason, in order to keep the cold water outlet temperature of a cold water manufacturing apparatus constant, an absorption chiller must be used as a base rod.

The present invention relates to an apparatus for producing cold water and a method for controlling the freezing capacity thereof, and more particularly, to an apparatus for preparing cold water by combining a compression refrigerator and an absorption refrigerator.

1 is a system diagram of a cold water production apparatus according to an embodiment of the present invention,

2 is a system diagram of an apparatus for producing cold water according to another embodiment of the present invention;

3 is a system diagram of an apparatus for producing cold water according to still another embodiment of the present invention;

4 is a graph showing an input relationship between a temperature drop and a refrigerator;

5 is a graph showing a relationship between an operating point and a surging point of a turbo compressor;

6 is a graph showing the relationship between the operating point and the efficiency of the turbo compressor;

7 is a graph showing the relationship between the load sharing and the cold water temperature of the compression refrigerator and absorption refrigerator,

8 is a graph showing the relationship between the energy cost for cooling and operation time.

(The best mode for carrying out the invention)

Combination of the compressor and absorption chiller is carried out, and the cold water is flowed in series in the order of the compression chiller and the absorption chiller, the temperature of the cold water between the compression chiller and the absorption chiller is detected and the respective chillers are kept constant. When controlled, the compression type refrigerator is the same as the control of a general refrigerator that constantly controls the cold water outlet temperature. When the cooling water temperature is equal to or less than the design specification, the compression ratio of the compressor of the compression type refrigerator is not excessive. In addition, when the outside air temperature increases in summer, and the coolant temperature decreases in the intermediate period, the compressor's compression ratio can be lower than the design value even if the set temperature of the control system controlling the compressor is reduced according to the temperature difference of the cooling water temperature of the specification. can do.

The temperature detector of the control device controlling each refrigerator is installed in the cold water pipe between the two refrigerators, and the load of the compressor is first loaded by setting the temperature of the controller of the absorption chiller always higher than the temperature of the controller of the compressor. When it is applied and cannot be cooled by the compressed refrigerator, and the cold water outlet temperature of the compressed refrigerator is higher than the set temperature of the controller, the controller of the absorber refrigerator is operated to apply a load to the absorber refrigerator.

When the load is low, operate only the compressed refrigerator, and when the load increases and the output of the compressed refrigerator reaches 100%, start the absorption refrigerator and fix the compressed refrigerator at 100%. It is run and the deficit is replenished with an absorption chiller.

In addition, when the absorption chiller also has a minimum refrigeration capacity for continuous operation, and the opening of the fuel control system of the absorption chiller, or the output of the control unit is less than the minimum capacity, by operating the control of the compressed refrigerator, The capacity is adjusted according to the load, the load increases, the output of the compressed refrigerator becomes 100%, and when the output of the absorbed refrigerator becomes more than the minimum capacity, the output of the compressed refrigerator is fixed to 100%. The load is preferentially applied to the compression freezer by operating at an output suitable for the load.

(Initiation of invention)

In the conventional apparatus for manufacturing cold water by flowing cold water in two freezers in a compression freezer and an absorption freezer, there is a problem in that energy saving of the freezer is not utilized.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a cold water production apparatus capable of achieving energy saving and low operating cost by combining a compression refrigerator and an absorption refrigerator, and a method for controlling the freezing capacity thereof.

In order to achieve the above object, a first feature of the present invention is to connect a turbo compressor, a condenser, and an evaporator by a refrigerant pipe, and a compressor-type compressor having a refrigeration cycle, an evaporator, an absorber, a condenser, and a regenerator by a pipe and a flow path. Cold water at the inlet of the absorption chiller in a cold water production apparatus having an absorption chiller configured to be connected to a refrigeration cycle, wherein the chillers are connected in series by cold water piping, and the cold water flows in the order of the compression chiller and the absorption chiller. Means for detecting the temperature of the cold water; and setting the temperature of the cold water so as to increase the load of the compressed refrigerator more than the load of the absorption chiller, and freezing the chillers so that the temperature of the cold water detected by the means is the set temperature. It is to have a control means for controlling the capacity.

A second feature of the present invention is to connect a turbo compressor, a condenser, and an evaporator by a refrigerant pipe, and to connect a compressor, an evaporator, an absorber, a condenser, and a regenerator, by piping and a flow path. In a cold water producing apparatus having an absorption chiller constituted, wherein both chillers are connected in series by cold water pipes, and the cold water flows in the order of the compressed chiller and the absorber chiller. Means for detecting a cold water outlet temperature and control means for controlling the freezing capacity of the compressed refrigerator such that the cold water outlet temperature detected by the means is a set temperature at which the load of the compressed refrigerator is larger than that of the absorber refrigerator. The absorption chiller comprises means for detecting the cold water inlet temperature of the absorption chiller, Is on the detected temperature by the cold water inlet to the set temperature than that of the absorption chiller loads increase the load of the compression type refrigerating machine is in to a control means for controlling the refrigeration capacity of the absorption chiller.

A third feature of the present invention is to connect a turbo compressor, a condenser, and an evaporator by a refrigerant pipe, and to connect a compressor-type compressor having a refrigeration cycle, an evaporator, an absorber, a condenser, and a regenerator by a pipe and a flow path, thereby providing a refrigeration cycle. In a cold water producing apparatus having an absorption chiller constituted, wherein both chillers are connected in series by cold water pipes, and the cold water flows in the order of the compressed chiller and the absorber chiller. Means for detecting a cold water outlet temperature and control means for controlling the freezing capacity of the compressed refrigerator such that the cold water outlet temperature detected by the means is a set temperature at which the load of the compressed refrigerator is larger than that of the absorber refrigerator. Wherein the absorption chiller is means for detecting the cold water inlet temperature of the absorption chiller And control means for controlling the freezing capacity of the absorption chiller such that the cold water inlet temperature detected by this means is a set temperature which increases the load of the compression chiller rather than the load of the absorption chiller. Or means for detecting the cooling water temperature at the outlet, and raising the set temperature of the cold water outlet of the compressed refrigerator and the set temperature of the cold water inlet of the absorption refrigerator as the cooling water temperature detected by the means increases. It is to have a control means for controlling to lower the set temperature of the cold water outlet of the compressed refrigerator and the set temperature of the cold water inlet of the absorption chiller as it is lowered.

In addition, a fourth aspect of the present invention is to connect a turbo compressor, a condenser, and an evaporator by a refrigerant pipe, and a refrigeration cycle comprising a refrigeration cycle, an evaporator, an absorber, a condenser, and a regenerator by a pipe and a flow path, thereby providing a refrigeration cycle. A refrigeration capacity control method of a cold water production apparatus having an absorption chiller configured in such a manner that both chillers are connected in series by a cold water pipe, and that cold water flows in the order of a compression chiller and an absorption chiller. The refrigeration capacity of each refrigerator is controlled so that the cold water temperature becomes a set temperature so that the load of the compressed refrigerator is larger than that of the absorption chiller.

According to the present invention having the above-mentioned characteristics of the first, second and fourth, the cold water for cooling is flowed in the order of the compression freezer and the absorption freezer, and then flows to the air conditioning load, and the cold freezer outlet cold water (absorption type) The temperature of the freezer inlet cold water) is detected, and both of the refrigerators are controlled so that the detected temperature is a set temperature, and this set temperature is such that the load of the compression type refrigerator is always greater than the load of the absorption type refrigerator. In general, the compressed refrigerator uses electricity, but the power rate tends to decrease rapidly as the usage increases. In the present invention, the compression type refrigerator is used in preference to the absorption type refrigerator, and therefore, the overall operating cost combined with both of the refrigerators can be reduced.

In addition, the air-conditioning load changes approximately in proportion to the ambient temperature, and in general, since the coolant receiving waste heat from the freezer is cooled in a cooling tower (cooling tower), the coolant inlet temperature of the freezer also rises and falls with the ambient temperature. Therefore, the coolant inlet temperature of the refrigerator has a characteristic of rising and falling with the air conditioning load. According to the present invention having the above-described third feature, when the air-conditioning load is reduced, the compressed chiller is controlled to lower the cold water temperature between the compressed chiller and the absorbing chiller according to the cooling water inlet or outlet temperature of the compressed chiller. By full load long term operation, the absorption chiller can be used for short peak loads. Comparing the energy cost for cooling by gas and electricity, which are energy sources of the refrigerator, the energy cost for cooling by electricity is lower than that of gas when operated for a long time. Since a compression refrigerator is generally operated with an electric furnace and an absorption refrigerator with a gas, it is possible to reduce the running cost by preferentially using a compressed refrigerator by performing long-term operation of such a fully loaded compressor.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1.

1 to 1 is an evaporator of a compressed refrigerator, 2 is a compressor, 3 is an electric motor, 4 is a condenser of a compressed refrigerator, 5 is a compressor control refrigerant gas control vane, 6 is a control vane driving device, 7 is a refrigerant of a compressed refrigerator. Expansion valve, 8 is evaporator of absorption chiller, 9 is absorber of absorption chiller, 10 is condenser of absorption chiller, 11 is regenerator of absorption chiller, 12 is fuel control valve, 13 is fuel control valve drive, 14 is fuel pipe, 15 is the chilled water of the compressed chiller, 16 is the chilled water inlet chiller, 17 is the medium temperature cold water, 18 is the chilled water outlet cold water, 19 is the temperature controller for the compressed chiller, 20 is the absorption chiller inlet temperature controller, 21 is the absorption chiller outlet Temperature controller, 22 is a compressed chiller coolant temperature controller, 23 is a selectable calculator, 24 is a compressed chiller cold water outlet temperature sensor, 25 is an absorbed chiller cold water inlet temperature sensor, 26 is a compressed chiller The coolant inlet temperature sensor, 27 is an absorption chiller cold water outlet temperature sensor.

The chiller inlet chilled water 16 first enters the evaporator 1 of the compressed chiller and is cooled to become intermediate temperature chilled water 17, and enters the chiller 8 of the absorption chiller and is cooled again to cool the chiller outlet chilled water 18. It flows out.

The compressor freezer temperature controller 19 detects the temperature of the intermediate temperature cold water 17 cooled and discharged by the compressor freezer by the compressor freezer cold water outlet temperature sensor 24 to control the compressor inlet refrigerant gas control vane 5. The control output is transmitted to the control vane driving device 6 for opening and closing the compressor and the compressor inlet refrigerant gas control vane 5 operates so that the temperature of the intermediate temperature cold water 17 becomes a given set value.

In addition, in the present embodiment, the control vane is used to control the compressor chiller capacity by varying the cross-sectional area of the compressor suction side, but the compressor speed is controlled by varying the rotation speed of the compressor. have.

The absorption chiller inlet temperature controller 20 detects the temperature of the intermediate temperature cold water 17 with the absorption chiller cold water inlet temperature sensor 25 to open and close the fuel control valve 12 of the absorption chiller 13. Is given to the control output via the selection calculator 23, and the fuel control valve drive device 13 operates so that the temperature of the intermediate temperature cold water 17 is at a given set value.

The absorption chiller outlet temperature controller 21 detects the temperature of the cooling device outlet cold water 18 with the absorption chiller cold water outlet temperature sensor 27 and lowers it to below the set temperature, thereby giving the selection signal to the selection calculator 23. The selection calculator 23 compares the output signals of the absorption chiller inlet temperature controller 20 and the absorption chiller outlet temperature controller 21, selects a lower signal, and gives the fuel control valve driving device 13.

The compressed refrigerator coolant temperature controller 22 detects the inlet temperature of the coolant 15 of the compressed refrigerator with the compressed refrigerator coolant inlet temperature sensor 26 and changes the inlet temperature of the coolant 15 of the compressed refrigerator. The set value of the compression type refrigerator temperature controller 19 and the absorption type refrigerator inlet temperature controller 20 is changed by multiplying the value by a ratio.

Temperature drop = coolant inlet temperature-cold water outlet temperature

With such a configuration, the temperature drop shown in Equation (1) in the compression freezer becomes small, and as shown in FIG. 4, the compression freezer reduces the input (required power) in proportion to the decrease in temperature drop. As the absorption chiller has a characteristic that the reduction of the driving input is smaller than that of the compression chiller, the driving input of the total compression compressor and the absorption chiller can be very small.

The set value of the temperature controller 19 for the compressed refrigerator, which controls the intermediate temperature cold water 17, which becomes the cold water outlet temperature of the compressed refrigerator, to be the set temperature, in accordance with the rate at which the inlet temperature of the cooling water 15 of the compressed refrigerator is changed. By changing, the temperature drop of the compression type refrigerator can be kept constant, and the compression type refrigerator can be operated efficiently.

In the case of using a turbo compressor for the compressor, if the cold water outlet temperature is lowered when the coolant inlet temperature is high, the compression ratio becomes high, and as shown in FIG. 5, the operating point is moved to the B point higher than the design point A, and the operating point approaches the surging point. It is especially important to keep the compression ratio below a certain amount because of the characteristic that it becomes impossible.

In addition, if a turbo compressor is used for the compressor, and the maximum compression ratio of the turbo compressor is designed to be a compression ratio capable of cooling to the temperature of the cooling device outlet cold water 18, the temperature of the intermediate temperature cold water 17 can be changed regardless of the cooling water temperature. However, by driving between point C and point D of FIG. 6, driving at point D, which is inefficient during full load, requires a large driving force.

If the turbo compressor is designed to correspond to the compression ratio of cooling the compressor to the temperature of the intermediate temperature cold water 17 when the compressor and the absorption refrigerator are operated at full load, the characteristics of the turbo compressor become as shown by the dotted line in FIG. The efficiency of point D rises significantly from d to d 'and the power decreases approximately in proportion to the temperature drop.

In order to prevent the compression ratio of the operating point of the turbo compressor from being equal to or higher than the point D in FIG. 6, the set temperature of the temperature controller 19 for the compressed refrigerator according to the value at which the inlet temperature of the cooling water 15 of the compressor is lower than the designed value. If you lower the better.

The air-conditioning load changes in proportion to the approximate atmospheric temperature, and since the cooling water is generally cooled in the cooling tower, the cooling water temperature also rises and falls with the atmospheric temperature. Therefore, when the air conditioning load decreases and the temperature of the cooling device inlet cold water 16 returned from the air conditioning load side is lowered, the cooling water temperature also decreases, so that the temperature controller for the compressed freezer according to the decrease in the inlet temperature of the cooling water 15 of the compression freezer. By lowering the set temperature of the intermediate temperature cold water 17 of 19, the compressed refrigerator is always operated at almost full load.

The absorption chiller detects the temperature of the intermediate temperature cold water 17 by the absorption chiller cold water inlet temperature sensor 25 and is controlled by the absorption chiller cold water inlet temperature controller 20 so that this temperature is constant. Therefore, when the load decreases, the temperature of the cooling device outlet cold water 18 rises and approaches the temperature of the intermediate temperature cold water 17. With such control, the absorption chiller also reduces the temperature drop between the cold water and the cooling water, thereby reducing the driving force and saving energy.

As in the absorption chiller cold water inlet temperature controller 20, the setpoint is changed by the temperature of the cooling water 15 of the compressed refrigerator, similarly to the temperature controller 19 for the compressed refrigerator, but the setpoint of the temperature controller 19 for the compressed refrigerator is always changed. The more absorbent chiller cold water inlet temperature controller 20 is set to a slightly higher temperature. In this way, first, the compressed refrigerator becomes full load, and there is more load than the capacity of the compressed refrigerator, and the temperature of the intermediate temperature cold water 17 becomes equal to or higher than the set value of the temperature controller 19 for the compressed refrigerator. The cold water inlet temperature controller 20 is operated and operated to increase the fuel flowing through the fuel pipe 14 of the absorption chiller to compensate for the lack of capacity of the compression chiller with respect to the load.

The cold water outlet temperature controller 21 of the absorption chiller detects the temperature of the cooling device outlet cold water 18 by the absorption chiller cold water outlet temperature sensor 27 and controls the direction of closing the fuel control valve 12 when the temperature is lower than the set value. Output the signal. The selection calculator 23 compares the output signal of the absorption chiller cold water inlet temperature controller 20 with the output signal of the absorption chiller cold water outlet temperature controller 21, and selects a signal in a direction of closing the fuel control valve 12. A signal is output to the fuel control valve drive device 13. Therefore, the temperature of the cooling device cold water outlet 18 falls below the set value, that is, the overcooling can be prevented.

When the above-mentioned thing is shown in FIG., It will become like FIG.

If the load is 100%, cold water is sent to the air-conditioning load at 7 ° C (R point), and back to 14 ° C from the air-conditioning load (P point). If the load is 0%, cold water is sent to the air-conditioning load at 8 ° C, and it returns to 8 ° C which is the same temperature from the air-conditioning load (Z point).

If the load is 100%, the cold water (point P) returned to 14 ° C from the air conditioning load is 3.5 ° C at its maximum capacity to 10.5 ° C (Q point), and the absorption type refrigerator is 10.5 at the maximum capacity. It is sent to the air-conditioning load by bringing the temperature from 7 ° C. to 3.5 ° C. to 7 ° C.

When the load is lowered, the temperature of the cold water returned from the air conditioning load is lower than when the load is 100% (for example, S point). Then, as in the case of 100% load, the maximum capacity of the compressed refrigerator is lowered to about 3.5 ° C. to the T point, and the absorption type refrigerator is controlled again, cooled to the U point, and sent to the air conditioning load.

Therefore, in the present invention, the load is preferentially applied to the compressor.

When the load is about 46%, the absorption chiller can be stopped and responded only by the maximum capacity of the compressed refrigerator (point W at V).

When the load decreases again, only the compressed refrigerator is controlled by volume control (for example, X point to Y point).

As shown in FIG. 7, the load is preferentially applied to the compression type refrigerator in the pre-operation region, and the compression type refrigerator is subjected to a high load operation for a long time. Absorption chillers operate only at peak loads, resulting in short run times.

In mid-latitude locations such as Japan, the average annual summer cooling load is about 40% of the peak load. Therefore, if the capacity of the compressed refrigerator is selected from 40% to 50% of the total capacity of the compressed refrigerator and the absorption refrigerator, the compressed refrigerator operates about half of the operating time per year at full load, thereby increasing the overall efficiency.

2 is a view showing another embodiment of the present invention. The outlet temperature of the cooling water 15 of the compressed refrigerator is detected by the compressed refrigerator cooling water outlet temperature sensor 28 and controlled in the same manner as in the embodiment of FIG. 1 to control the temperature controller 19 of the compressed refrigerator and the cold water inlet of the absorption refrigerator. By changing the set value of the temperature controller 20 by the outlet temperature of the cooling water 15, an effect equivalent to that of the embodiment of FIG. 1 can be obtained.

3 is a view showing another embodiment of the present invention. By using steam as a driving source in the absorption chiller and controlling the steam flowing through the steam pipe 31 by the steam control valve 29 and the steam control valve driving device 30, the embodiment of FIG. The same effect is obtained.

According to the present invention, by combining the compressed refrigerator and the absorption refrigerator to cool the cold water in the order of the compression refrigerator and the absorption refrigerator, the temperature drop (cooling water inlet temperature-cold water outlet temperature) of the compressed refrigerator is reduced, and the driving power is reduced. It can be made very small.

In general, since the compressor is driven by an electric motor, the driving power is significantly reduced because the basic fee for the fixed power is reduced.

When the load decreases, the temperature of the intermediate temperature cold water of the compression type refrigerator and the absorption type refrigerator is lowered according to the cooling water temperature, so that the compressed type refrigerator can be used for long-term operation under full load, and the absorption type refrigerator can be used for short time peak load. When such a driving operation is carried out, especially when the compressor is driven by an electric motor, as shown in Fig. 8, the electric power with a large fixed cost burden is used for a long time, so that the cost is low, and the operating cost can be greatly reduced. 8 is calculated by assuming that power is 1.0kW / RT and gas is 0.65Nm 3 / RT in a 300RT refrigerator.

In general, the compressed refrigerator uses electricity, but since the electricity charge tends to decrease rapidly as the usage increases, the total operating cost of both refrigerators by applying the load by using the compressed refrigerator in preference to the absorption refrigerator. Can be reduced.

In addition, there is a feature that the change in the air conditioning load and the coolant temperature are linked to each other. When the air conditioning load is reduced, the chilled water temperature of the compressed chiller and the absorber chiller is controlled to decrease the temperature of the cold water between the compressed chiller and the absorbent chiller, so the absorber chiller can be used as a short-term peak load for long-term operation of the compressed chiller. have. Comparing the energy cost for cooling the gas with electricity, which is the energy source of the refrigerator, the energy cost for cooling the electricity is less than that of the gas when operated for a long time. Since a compression refrigerator is generally operated with an electric furnace and an absorption refrigerator with a gas, it is possible to reduce the running cost by preferentially using a compressed refrigerator by performing long-term operation of such a fully loaded compressor.

Claims (11)

A compressor-type refrigerator having a refrigeration cycle by connecting a turbo compressor, a condenser, an evaporator, and a decompression means by a refrigerant pipe; An evaporator, an absorber, a condenser, and a regenerator are connected by a pipe or a flow path, and an absorption chiller having a refrigeration cycle is configured. In the cold water manufacturing apparatus which made it flow, Means for detecting a temperature of cold water at the outlet of the compressed refrigerator; Control means of a compressed refrigerator for controlling the compressed refrigerator such that the cold water temperature detected by the cold water temperature detecting means becomes a set temperature; Cooling water temperature detection means for detecting a temperature of the cooling water flowing in the compressed refrigerator; Means for changing a set temperature of the control means of the compressed refrigerator, wherein the set temperature changing means changes the set temperature of the cold water based on the coolant temperature detected by the coolant temperature detection means; Manufacturing equipment. The method of claim 1, Means for detecting a cold water inlet temperature of the absorption chiller; A control means of an absorption chiller for controlling the absorption chiller based on the temperature detected by the temperature detecting means, the control means of the absorption chiller having control means for controlling the heat input amount of the regenerator of the absorption chiller, The control means of the refrigerator comprises any one of a control means for controlling the cross-sectional area of the suction side flow path of the turbo compressor or a control means for controlling the rotational speed of the compressor. The method of claim 1, The control means of the compressed refrigerator is cold water production apparatus characterized in that to reduce the cold water outlet set temperature of the compressed refrigerator as the cooling water temperature detected by the cooling water temperature detection means. The method of claim 3, wherein The control means of the compressed refrigerator comprises a temperature control system. A compressor-type refrigerator having a refrigeration cycle by connecting a turbo compressor, a condenser, an evaporator, and a decompression means by a refrigerant pipe; An evaporator, an absorber, a condenser, and a regenerator are connected by piping and a flow path, and have an absorption chiller having a refrigeration cycle.The chillers are connected in series by a cold water pipe, and the cold water flows in the order of a compression freezer and an absorption chiller. In the cold water production apparatus made of the configuration, Means for detecting a temperature of cold water at the outlet of the compressed refrigerator; Control means of a compressed refrigerator for controlling the compressed refrigerator such that the detected cold water outlet temperature becomes a set temperature; Cooling water temperature detection means for detecting a temperature of the cooling water flowing in the compressed refrigerator; And means for changing a set temperature of the control means of the compressed refrigerator, wherein the set temperature changing means reduces the set temperature of the cold water outlet to a temperature at which the turbo compressor does not cause surging. . The method according to any one of claims 1 to 4, And if the load of the absorption chiller is equal to or less than the capacity control range of the absorption chiller, the control means of the compression chiller operates the compression chiller at full load. The method according to any one of claims 1 to 4, And a maximum freezing capacity of the compressed refrigerator is 40% to 50% of the freezing capacity of the combined maximum freezing capacity of the compressed refrigerator and the maximum freezing capacity of the absorption refrigerator. A compressor-type refrigerator having a refrigeration cycle by connecting a turbo compressor, a condenser, an evaporator, and an expansion valve by a refrigerant pipe; An evaporator, an absorber, a condenser, and a regenerator are connected by piping or a flow path, and have an absorption type refrigerator having a refrigeration cycle, and the two refrigerants are connected in series by cold water pipes, and the cold water flows in the order of the compression type refrigerator and the absorption type refrigerator. In the cold water production apparatus made of the configuration, The compressor includes a temperature sensor for detecting a cold water outlet temperature of the compressor; A temperature controller for controlling the compressed refrigerator to the set cold water outlet temperature based on the cold water outlet temperature detected by the temperature sensor; A cooling water temperature sensor for detecting an inlet temperature of the cooling water flowing into the compressed refrigerator or an outlet temperature of the cooling water flowing out of the refrigerator, and the absorption chiller includes a second temperature sensor for detecting a cold water inlet temperature of the absorption refrigerator; ; Means for installing a temperature controller for controlling the absorption chiller to the set cold water inlet temperature based on the cold water temperature detected by the second temperature sensor, and for changing the set temperature of the temperature controller of the compression refrigerator and the temperature controller of the absorption refrigerator. Install it, The set temperature changing means lowers the temperature control system of the compressed refrigerator and the set cold water outlet temperature set in the absorption chiller as the temperature of the coolant detected by the coolant temperature sensor decreases, and the temperature controller of the absorption chiller is the absorption chiller. And setting the set cold water inlet temperature of the compressed chiller higher than the set chilled water outlet temperature of the compressed chiller, thereby operating the compressed chiller over the absorbed chiller. A compressor-type refrigerator having a refrigeration cycle by connecting a turbo compressor, a condenser, an evaporator, and a decompression means by a refrigerant pipe; An evaporator, an absorber, a condenser, and a regenerator are connected by piping or a flow path, and have an absorption type refrigerator having a refrigeration cycle, and the two refrigerants are connected in series by cold water pipes, and the cold water flows in the order of the compression type refrigerator and the absorption type refrigerator. In the refrigeration capacity control method of the cold water production apparatus, A method of controlling the freezing capacity of a cold water production apparatus, characterized by changing a set value of a cold water outlet temperature of a compressed refrigerator based on a cooling water temperature flowing in the compressed refrigerator so that the load of the compressed refrigerator is greater than that of the absorption refrigerator. The method of claim 9, And a cold water outlet setting temperature of the compressed refrigerator is set to a temperature at which a surge can be prevented from occurring in the turbo compressor. The method of claim 9, A method of controlling the freezing capacity of a cold water production apparatus, characterized in that the cold water outlet setting temperature of the compressed refrigerator is lowered as the temperature of the cooled water at the inlet or the outlet of the compressed refrigerator is lowered.

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