JP2016057005A - Adsorption type refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption type refrigeration system capable of effectively utilizing heat supplied to an absorption type refrigeration machine.SOLUTION: An adsorption refrigeration system 1 includes two absorption type refrigeration machines 21 obtaining cold water used in five indoor machines 31 by a circulation cycle with an evaporator, an absorber, a regenerator and a condenser, and a system controller 40 controlling the absorption type refrigeration machines. The system controller compares a heat quantity that is imparted to cold water by five indoor machines with the refrigeration capacity of the two absorption type refrigeration machines, and controls the number of machines to be operated out of the two absorption type refrigeration machines.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorption refrigeration system.

  2. Description of the Related Art Conventionally, an absorption refrigerator that obtains cold water used in external equipment by a circulation cycle using an evaporator, an absorber, a regenerator, and a condenser is known (see, for example, Patent Document 1). Also known is an absorption refrigeration system equipped with a heat storage tank for supplying a heat medium to the regenerator of this absorption refrigeration machine and a cooling tower for supplying cooling water to the absorber and condenser of this absorption refrigeration machine. Yes.

  In the absorption refrigerator, the temperature adjustment is stopped according to the temperature of the cold water supplied from the absorption refrigerator to the external device. Here, the temperature adjustment stop is to temporarily stop the operation of the absorption refrigerator until the temperature of the cold water becomes equal to or higher than the temperature adjustment start temperature when the temperature of the cold water becomes equal to or lower than the temperature adjustment stop temperature.

JP 2014-035139 A

  By the way, when the operation of the absorption chiller is temporarily stopped due to a temperature control stop or the like, the heat introduced into the absorption chiller is radiated by the cooling tower, so that there is a problem that heat is wasted. The absorption refrigerator can effectively use the introduced heat as long as the operation is continued. However, if the operation is intermittently stopped, the heat cannot be effectively used.

  Some absorption refrigeration systems include a plurality of absorption chillers according to the maximum load of an external device. In such a system, when the external device has a low load, the temperature control stop is repeated for all absorption refrigerators, and thus the above-described problem becomes more prominent.

  This invention is made | formed in view of this situation, The objective provides the absorption refrigeration system which can utilize effectively the heat supplied to an absorption refrigeration machine.

  In order to solve this problem, the present invention provides a plurality of absorption refrigerators for obtaining cold water used in external equipment by a circulation cycle by an evaporator, an absorber, a regenerator, and a condenser, and a plurality of absorption refrigeration units. An absorption refrigeration system having a controller for controlling each of the machines. Here, the controller compares the amount of heat given to the cold water by the external device with the refrigeration capacity of the plurality of absorption chillers, and controls the number of operating units of the plurality of absorption chillers.

  Here, the present invention may further include a heat storage tank that stores heat collected by the solar heat collector. In this case, the heat storage tank supplies a heat medium to each of the plurality of absorption chillers, and each of the plurality of absorption chillers absorbs the refrigerant evaporated in the evaporator with the absorption liquid in the absorber, It is preferable that the absorbing liquid that has absorbed the refrigerant is supplied to the regenerator, and the absorbing liquid supplied from the absorber to the regenerator is warmed by the heat medium supplied from the heat storage tank.

  The present invention also includes a cold water flow path for circulating cold water from an external device through a plurality of absorption refrigerators to the external device again, and a plurality of cooling water supplied to the condensers and absorbers of the plurality of absorption refrigerators. And a cooling tower. In this case, the controller sets the temperature of the cold water returning from the external device to the plurality of absorption refrigerators, the temperature of the cold water supplied from the plurality of absorption refrigerators to the external device, and the flow rate of the cold water flowing through the cold water passage. Based on this, it is preferable to calculate the amount of heat given to the cold water by the external device. In addition, the controller, for each of the plurality of absorption refrigerators, the temperature of the heat medium supplied to the absorption refrigerator, the temperature of the cooling water supplied to the absorption refrigerator, and the absorption refrigerator It is preferable to calculate the refrigerating capacity based on the temperature characteristics.

  According to the present invention, even if the external device has a low load, the number of absorption chillers corresponding to the load is operated. Therefore, the frequency of temporary suspension of operation such as temperature control stop of the absorption chiller during operation becomes low, and it is possible to suppress a situation in which all absorption chillers repeatedly stop temperature control. Thereby, the heat supplied to the absorption refrigerator can be used effectively.

Configuration diagram schematically showing absorption refrigeration system Schematic configuration diagram showing an example of an absorption refrigerator Flow chart showing control method of absorption refrigeration system Explanatory diagram showing temperature characteristics of absorption refrigerator

  FIG. 1 is a configuration diagram schematically showing an absorption refrigeration system 1 according to the present embodiment. The absorption refrigeration system 1 according to the present embodiment heats a diluted solution of the absorption chiller 21 using solar heat, and includes a first system 10, a second system 20, a third system 30, And a system controller 40.

  The first system 10 is a system for storing solar heat, and includes a solar heat collector 11, a heat storage tank 12, a heat collection passage 13, and a heat collection pump 14.

  The solar heat collector 11 heats the heat medium by receiving sunlight, and is installed at a position where it is easy to receive sunlight, such as on a roof. As the heat medium, water, antifreeze (for example, propylene glycol aqueous solution), or the like is used.

  The heat storage tank 12 stores heat collected by the solar heat collector 11, and is, for example, a tank that stores therein a heat medium heated by the solar heat collector 11.

  The heat collection channel 13 is a pipe that circulates the heat medium from the heat storage tank 12 through the solar heat collector 11 to the heat storage tank 12 again. Among the heat collection channels 13, a channel from the heat storage tank 12 toward the solar heat collector 11 is referred to as a first heat collection channel 13a, and a channel from the solar heat collector 11 toward the heat storage tank 12 is a second heat collection channel. It is called 13b.

  The heat collection pump 14 is provided in the 1st heat collection flow path 13a, and becomes a power source which circulates a heat medium.

  In the present embodiment, the heat collecting method is a direct heat collecting type, and a heat medium circulating between the solar heat collector 11 and the heat storage tank 12 in the heat collecting flow path 13 and a heat medium flow path 22 described later. A heat medium circulating between the heat storage tank 12 and the absorption refrigerator 21 is shared. However, the heat collection method is an indirect heat collection type, a heat medium that circulates between the solar heat collector 11 and the heat storage tank 12 in the heat collection flow path 13, and a heat storage tank 12 and an absorption type in the heat medium flow path 22. You may isolate | separate and use the heat medium which circulates between the refrigerators 21. In this case, the heat storage tank 12 is provided with a heat exchanger, and the heat storage tank 12 can be heated by flowing a heat medium circulating through the heat collecting flow path 13 to the heat exchanger.

  The second system 20 is for obtaining cold water used in an indoor unit 31 to be described later, and includes a plurality (two in the present embodiment) of absorption chillers 21, a heat medium flow path 22, and heat. A medium pump 23 is provided. In the present embodiment, cold water is used in the indoor unit 31. However, the present invention is not limited to cold water, and other refrigerants may be used.

  FIG. 2 is a schematic configuration diagram illustrating an example of the absorption refrigerator 21. Each absorption refrigerator 21 heats a dilute solution in a regenerator and obtains cold water by a circulation cycle of the regenerator, a condenser, an evaporator, and an absorber. Each absorption refrigerator 21 includes a regenerator 101, a condenser 102, an evaporator 103, and an absorber 104. Each absorption refrigerator 21 is combined with a cooling tower 25 and a cooling water flow path 26.

  The regenerator 101 heats a dilute solution (solution having a low concentration of the absorbing solution) in which a refrigerant (for example, water) and lithium bromide (LiBr) serving as an absorbing solution are mixed. Hereinafter, the refrigerant vaporized is referred to as “refrigerant vapor”, and the refrigerant liquefied is referred to as “liquid refrigerant”. The regenerator 101 is provided with a heat medium flow path 22, and a dilute solution is sprayed on the heat medium flow path 22 and heated. The regenerator 101 generates a refrigerant vapor and a concentrated solution (a solution having a high concentration of absorption liquid) by releasing the vapor from the dilute solution by heating.

  The condenser 102 liquefies the refrigerant vapor supplied from the regenerator 101. In the condenser 102, a heat transfer tube 102a through which the cooling water cooled by the cooling tower 25 flows is provided. A cooling water channel 26 is connected to the heat transfer tube 102 a so that the cooling water can circulate between the heat transfer tube 102 a and the cooling tower 25. The evaporated refrigerant vapor is liquefied by the cooling water in the heat transfer tube 102a. The liquid refrigerant liquefied by the condenser 102 is supplied to the evaporator 103.

  The evaporator 103 evaporates the liquid refrigerant. In the evaporator 103, a cold water passage 32 connected to an indoor unit 31 described later is provided. Cold water heated by the indoor unit 31 flows through the cold water passage 32. Further, the inside of the evaporator 103 is in a vacuum state. For this reason, the evaporating temperature of the water which is a refrigerant | coolant will be about 5 degreeC. Therefore, the liquid refrigerant sprayed on the cold water passage 32 evaporates depending on the temperature of the cold water passage 32. On the other hand, the temperature of the cold water in the cold water flow path 32 is deprived due to the evaporation of the liquid refrigerant. Thereby, the cold water flowing in the cold water flow path 32 is cooled, and the cooled cold water is supplied to the indoor unit 31.

  The absorber 104 absorbs the refrigerant evaporated in the evaporator 103. A concentrated solution is supplied from the regenerator 101, and the evaporated refrigerant is absorbed by the concentrated solution to generate a diluted solution. In the absorber 104, a heat transfer tube 104a through which the cooling water cooled by the cooling tower 25 flows is provided. A cooling water flow path 26 is connected to the heat transfer tube 104 a so that the cooling water can circulate between the heat transfer tube 104 a and the cooling tower 25. Absorption heat generated by absorption of the refrigerant in the concentrated solution is removed by cooling water flowing through the heat transfer tube 104a. The dilute solution whose concentration is reduced by the absorption of the refrigerant is supplied to the regenerator 101 by the pump 104b. The heat transfer tube 104 a is connected to the heat transfer tube 102 a of the condenser 102 in order to share the cooling water of the cooling tower 25 with the condenser 102.

  The cooling tower 25 supplies cooling water to the absorption chiller 21 and cools the cooling water warmed by the absorption chiller 21. The cooling tower 25 has, for example, a tank that stores cooling water at the bottom. This tank is supplied with water by upper and lower floats, and the tank stores a certain amount of cooling water. In addition, the cooling tower 25 has a fan and a heat exchanging unit disposed below the fan at the top thereof. The cooling water returned from the absorption chiller 21 is sprayed on the heat exchange unit and cooled by passing through the heat exchange unit. The cooling water cooled by the heat exchange unit is stored in the tank.

  The cooling water channel 26 is a pipe that circulates the cooling water from the cooling tower 25 to the cooling tower 25 again through the absorber 104 and the condenser 102 of the absorption refrigerator 21. Among these, the flow path from the cooling tower 25 to the absorption chiller 21 is referred to as a first cooling water flow path 26a, and the flow path from the absorption chiller 21 to the cooling tower 25 is referred to as a second cooling water flow path 26b.

  The 1st cooling water flow path 26a is connected with the bottom part (bottom part of a tank) of the cooling tower 25, and the cooling water pump 27 is provided in this 1st cooling water flow path 26a. The cooling water pump 27 serves as a power source for circulating the cooling water. The 2nd cooling water flow path 26b is connected with the upper part (between a fan and a heat exchange part) of the cooling tower 25. FIG.

  Further, the absorption chiller 21 includes a control unit 105. The control unit 105 includes a CPU (Central Processing Unit) and controls the entire absorption refrigerator 21. Further, the control unit 105 operates the absorption refrigerator 21 or stops the operation based on a control output (operation command / pause command) from the system controller 40 described later.

  When operating the absorption chiller 21, the control unit 105 controls the absorption chiller 21 based on the cold water outlet temperature obtained from the cold water outlet temperature sensor provided in the cold water outlet pipe of the absorption refrigerator 21. . Specifically, the control unit 105 stores a temperature adjustment stop temperature and a temperature adjustment start temperature during the cooling operation (temperature adjustment stop temperature <temperature adjustment start temperature). The control unit 105 temporarily stops the operation when the cold water outlet temperature is equal to or lower than the temperature control stop temperature (temperature control stop). When the cold water outlet temperature is equal to or higher than the temperature control start temperature, the control unit 105 cancels the temperature control stop and performs the operation. To resume. In addition, the cold water pump 33 mentioned later is operating during the temporary stop, and the cold water is circulated.

  Referring again to FIG. 1, the heat medium flow path 22 is a pipe that circulates the heat medium from the heat storage tank 12 to the heat storage tank 12 again through the regenerator 101 of the absorption refrigerator 21. Among these, the flow path from the heat storage tank 12 to the regenerator 101 of the absorption chiller 21 is referred to as a first heat medium flow path 22a, and the flow path from the regenerator 101 of the absorption refrigeration machine 21 to the heat storage tank 12 is the first. This is referred to as two heat medium flow path 22b.

  The heat medium pump 23 is provided in the first heat medium flow path 22a of the heat medium flow path 22, and serves as a power source for circulating the heat medium.

  The third system 30 supplies cold water obtained by the absorption chiller 21 to the indoor unit 31, and includes a plurality of (for example, five) indoor units 31, a cold water flow path 32, and a cold water pump 33. It consists of

  Each indoor unit 31 is connected in parallel to the cold water flow path 32 and is provided indoors. Each indoor unit 31 is an air conditioner, and performs heat exchange between cold water supplied from the absorption chiller 21 and air taken from the room. By this heat exchange, heat is taken from the air to the cold water, thereby cooling the air. Each indoor unit 31 blows the cooled air into the room.

  The cold water flow path 32 is a pipe that circulates cold water from the indoor unit 31 through the evaporator 103 of the absorption refrigerator 21 to the indoor unit 31 again. Among these, the flow path from the evaporator 103 of the absorption chiller 21 to the indoor unit 31 is referred to as a first cold water flow path 32a, and the flow path from the indoor unit 31 to the evaporator 103 of the absorption chiller 21 is second. This is referred to as a cold water passage 32b.

  The chilled water pump 33 is provided in the second chilled water flow channel 32b of the chilled water flow channel 32, and serves as a power source for circulating the chilled water.

  The system controller 40 controls the entire absorption refrigeration system 1. Signals from various sensors are input to the system controller 40 as control inputs. The system controller 40 performs various calculations based on the control input, and outputs a control output according to the calculation result to each part of the absorption refrigeration system 1. As the system controller 40, a microcomputer mainly composed of a CPU, a ROM, a RAM, and an I / O interface can be used.

  The heat storage tank temperature sensor 41 is a sensor that detects the temperature of the heat storage tank 12, and outputs a signal corresponding to the temperature of the heat storage tank 12 to the system controller 40. The heat medium inlet temperature sensor 42 is a sensor that detects the temperature of the heat medium (heat medium inlet temperature) supplied to the regenerator 101 of the absorption chiller 21, and outputs a signal corresponding to the heat medium inlet temperature to the system controller 40. Output to. The heat medium inlet temperature sensor 42 is provided corresponding to each absorption refrigerator 21.

  The cold water outlet temperature sensor 43 is a sensor that detects the temperature of the cold water (cold water outlet temperature) supplied from the two absorption refrigerators 21 to the indoor unit 31, and outputs a signal corresponding to the cold water outlet temperature to the system controller 40. To do. The cold water inlet temperature sensor 44 is a sensor that detects the temperature of cold water (cold water inlet temperature) returning from the indoor unit 31 to the two absorption refrigerators 21, and outputs a signal corresponding to the cold water inlet temperature to the system controller 40. The chilled water flow rate sensor 45 is a sensor that detects the flow rate of chilled water (cold water flow rate) supplied from the absorption refrigerator 21 to the indoor unit 31, and outputs a signal corresponding to the chilled water flow rate to the system controller 40.

  The cooling water inlet temperature sensor 46 is a sensor that detects the temperature of the cooling water (cooling water inlet temperature) supplied from the cooling tower 25 to the absorber 104 of the absorption chiller 21, and a signal corresponding to the cooling water inlet temperature. Is output to the system controller 40. The cooling water inlet temperature sensor 46 is provided corresponding to each absorption refrigerator 21.

  As one of the features of the present embodiment, the system controller 40 compares the amount of heat given to the cold water by the five indoor units 31 with the refrigeration capacity of the two absorption refrigeration machines 21 and compares the two absorption chillers 21 with each other. We are going to control the number of operating units.

  FIG. 3 is a flowchart showing a control method of the absorption refrigeration system 1. This flowchart is called at a predetermined cycle and executed by the system controller 40.

  First, in step 10 (S10), the system controller 40 reads the sensor output. In this step 10, the heat medium inlet temperature from each heat medium inlet temperature sensor 42, the cold water outlet temperature from the cold water outlet temperature sensor 43, the cold water inlet temperature from the cold water inlet temperature sensor 44, the cold water flow rate from the cold water flow rate sensor 45, The cooling water inlet temperature is read from each cooling water inlet temperature sensor 46. Note that the heat medium inlet temperature can be replaced by the temperature of the heat storage tank 12 read from the heat storage tank temperature sensor 41.

  In step 11 (S11), the system controller 40 calculates the indoor load. The indoor load indicates the amount of heat given to the cold water by the five indoor units 31 per unit time. The indoor load is calculated by multiplying the subtracted value obtained by subtracting the chilled water outlet temperature from the chilled water inlet temperature by the chilled water flow rate.

  In step 12 (S12), the system controller 40 calculates the refrigerating capacity. The refrigeration capacity is the ability of the absorption chiller 21 to cool the cold water, and corresponds to the amount of heat taken from the cold water per unit time. The refrigerating capacity is calculated for each absorption refrigerator 21, and the temperature of the heat medium (heat medium inlet temperature) supplied to the absorption refrigerator 21 and the absorption refrigerator 21 are supplied to the absorption refrigerator 21. It is calculated based on the temperature of the cooling water (cooling water inlet temperature) and the temperature characteristics of the absorption chiller 21.

  Here, FIG. 4 is an explanatory diagram showing the temperature characteristics of the absorption refrigerator 21. In the figure, the horizontal axis indicates the heat medium inlet temperature, and the vertical axis indicates the refrigeration capacity. The figure shows temperature characteristics corresponding to a plurality of cooling water inlet temperatures from a low temperature to a high temperature. As shown in the figure, the refrigerating capacity of the absorption refrigerator 21 has a tendency that the higher the heat medium inlet temperature, the higher the capacity, and even at the same heat medium inlet temperature, the cooling water inlet The lower the temperature, the higher the ability.

  The system controller 40 holds a table or an arithmetic expression that defines the refrigerating capacity corresponding to the heat medium inlet temperature and the cooling water inlet temperature for each absorption refrigerator 21. The system controller 40 calculates the refrigeration capacity based on the heat medium inlet temperature and the cooling water inlet temperature with reference to the table or the arithmetic expression. In addition, when the refrigerating capacity of each absorption refrigerator 21 with which the absorption refrigerating system 1 is provided is the same or substantially the same, it is also possible to divert one table.

  In step 13 (S13), the system controller 40 determines the number of operating absorption chillers 21. Specifically, the number of operating absorption refrigerators 21 is determined by comparing the refrigerating capacity of each absorption refrigerator 21 and the indoor load. For example, when the indoor side load is lower than the refrigeration capacity of each absorption chiller 21, the number of operating units is determined to be one, and the indoor side load is higher than the refrigeration capacity of any of the absorption chillers 21. Is to determine the number of operating units to be two.

  In step 14 (S14), the system controller 40 outputs a control command (operation command or suspension command) to each absorption chiller 21 based on the determined number of operating units. For example, when the number of operating units is determined to be two, the system controller 40 outputs an operation command to each of the two absorption chillers 21. When the number of operating units is determined to be one, the system controller 40 outputs an operation command to one of the two absorption chillers 21 and the other absorption chiller 21. A pause command is output to. As the selection method of the absorption chiller 21 for outputting the operation command, any one of the two absorption chillers 21 can be arbitrarily selected. However, the absorption chillers 21 are sequentially switched to operate. It is also possible to select in order. Further, the system controller 40 stops driving sources such as the heat medium pump 23, the cooling water pump 27, and the fan of the cooling tower 25 for the absorption chiller 21 that has output the pause command.

  Thus, in this embodiment, the absorption refrigeration system 1 has two absorptions for obtaining cold water used in the five indoor units 31 by the circulation cycle of the evaporator 103, the absorber 104, the regenerator 101, and the condenser 102. And a system controller 40 that controls each of these absorption refrigerators 21. The system controller 40 compares the amount of heat given to the cold water by the five indoor units 31 with the refrigeration capacity of the two absorption chillers 21, and controls the number of operating units of the two absorption chillers 21.

  According to this configuration, even if the indoor unit 31 has a low load, the number of absorption chillers 21 corresponding to the load is operated. Therefore, it is possible to suppress a situation in which the temperature adjustment stop frequency is low for the absorption refrigerator 21 in operation and all the absorption refrigerators 21 repeat the temperature adjustment stop. Thereby, the heat supplied to the absorption refrigerator 21 can be used effectively.

  In addition, the absorption refrigerator 21 that stops operation can be used to reduce the power of the drive source such as the heat medium pump 23, the cooling water pump 27, and the fan of the cooling tower 25, thereby suppressing unnecessary energy consumption. can do. Moreover, since the absorption chiller 21 stops operation, an increase in the total operation time of the device can be suppressed, and the life of the device can be extended. In particular, the operating time of each absorption refrigeration machine 21 is averaged by selecting the absorption refrigeration machine 21 to be operated in order so that each absorption refrigeration machine 21 is operated in turn. It is possible to extend the service life.

  Further, according to the present embodiment, the absorption refrigeration system 1 further includes the heat storage tank 12 that stores heat collected by the solar heat collector 11. Here, the heat storage tank 12 supplies the heat medium to the two absorption refrigerators 21, respectively. Each of the two absorption refrigerators 21 absorbs the refrigerant evaporated in the evaporator 103 with the absorbing liquid in the absorber 104, supplies the absorbing liquid that has absorbed the refrigerant to the regenerator 101, and absorbs the refrigerant. The absorbing liquid supplied from the regenerator 104 to the regenerator 101 is warmed by the heat medium supplied from the heat storage tank 12.

  When determining the number of operating units, the amount of heat on the load side (the amount of heat given to the cold water by the five indoor units 31) is calculated, and the absorption chiller 21 is operated with the number of units commensurate with it. Here, in the method in which the regenerator 101 is heated directly by using gas or oil as fuel, the rated output can be obtained by maximizing the amount of fuel input, and therefore the number of operating units can be easily determined. However, in the method in which the regenerator 101 is heated by hot water using a heating medium heated by solar heat, the temperature of the heating medium is not stable, and the refrigeration capacity of the absorption refrigerator 21 is not stable. It becomes difficult.

  In this regard, according to the present embodiment, the refrigeration capacity of the absorption chiller 21 that uses a heat medium heated by solar heat can be appropriately calculated, so the number of operating units can be determined accurately.

  In the present embodiment, the absorption refrigeration system 1 includes a cold water flow path 32 that circulates cold water from the indoor unit 31 through the two absorption chillers 21 to the indoor unit 31 again, and two absorption chillers 21. And a plurality of cooling towers 25 for supplying cooling water to the condenser 102 and the absorber 104. Here, the system controller 40 calculates the amount of heat given to the cold water by the indoor unit 31 based on the cold water outlet temperature, the cold water inlet temperature, and the cold water flow rate. Further, the system controller 40 calculates the refrigeration capacity for each of the two absorption chillers 21 based on the heat medium inlet temperature, the cooling water inlet temperature, and the temperature characteristics of the absorption chiller 21. Yes.

  According to this configuration, the refrigerating capacity of the absorption chiller 21 can be obtained appropriately even in an environment where the temperature of the heat medium is not stable, such as a hot water tank. Thereby, the absorption refrigeration machine 21 can be operated with the number corresponding to the load on the indoor unit 31 side.

  Although the absorption refrigeration system according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention. Absent.

  In this embodiment, the absorption refrigerator uses a hot water tank method using a heating medium (hot water) heated by solar heat, but is not limited thereto. For example, the absorption refrigerator may be an exhaust gas soot system that uses exhaust gas from an engine or the like as a heat medium, or a steam soda system that uses steam such as a boiler as a heat medium. For example, in the case of the exhaust gas soot system, the temperature characteristics of the absorption refrigeration machine are determined according to the exhaust gas temperature instead of the above-described heat medium inlet temperature, whereby the refrigerating capacity can be obtained. Further, in the case of the steam tank system, the temperature characteristic of the absorption refrigerator is determined according to the steam pressure instead of the above-mentioned heat medium inlet temperature, and thus the refrigerating capacity can be obtained.

  In the above-described embodiment, two absorption chillers are illustrated, but the present invention can be applied to an absorption refrigeration system including a plurality of absorption chillers such as three or four. For example, it is possible to construct the absorption refrigeration system 1 with a large number of absorption chillers 21 such as 50 units.

  Moreover, in embodiment mentioned above, although five indoor units were illustrated as an apparatus using cold water, it is not limited to this, One unit or other indoor units may be sufficient. In addition to the indoor unit, any external device that uses cold water may be used. As an external apparatus, an industrial cooling device etc. are mentioned, for example.

  In the above-described embodiment, the cooling tower and the absorption chiller are provided on a one-to-one basis. However, a single cooling tower may be provided for a plurality of absorption chillers. The cooling tower may cool the cooling water using geothermal heat or groundwater. In such a system, since the cooling water can be kept at a low temperature, it is possible to increase the refrigeration capacity of the absorption chiller. In the present invention, the number of operating units can be accurately controlled even in such systems having different refrigeration capacities.

DESCRIPTION OF SYMBOLS 1 Absorption-type refrigeration system 10 1st system 11 Solar thermal collector 12 Thermal storage tank 20 2nd system 21 Absorption-type refrigerator 101 Regenerator 102 Condenser 103 Evaporator 104 Absorber 25 Cooling tower 30 3rd system 31 Indoor unit 40 System Controller (Controller)

Claims (3)

A plurality of absorption refrigerators for obtaining cold water used in external equipment by a circulation cycle by an evaporator, an absorber, a regenerator and a condenser;
A controller for controlling each of the plurality of absorption chillers,
The controller compares the amount of heat given to the cold water by the external device with the refrigeration capacity of the plurality of absorption chillers, and controls the number of operating the plurality of absorption chillers. Refrigeration system. A heat storage tank for storing heat collected by the solar heat collector;
The heat storage tank supplies a heat medium to the plurality of absorption refrigerators,
Each of the plurality of absorption chillers absorbs the refrigerant evaporated in the evaporator with the absorbing liquid in the absorber, supplies the absorbing liquid that has absorbed the refrigerant to the regenerator, and from the absorber The absorption refrigeration system according to claim 1, wherein the absorption liquid supplied to the regenerator is heated by a heat medium supplied from the heat storage tank. A cold water flow path for circulating cold water from the external device to the external device again through the plurality of absorption refrigerators;
A plurality of cooling towers for supplying cooling water to the condenser and the absorber of the plurality of absorption refrigerators, and
The controller is
Based on the temperature of the cold water returning from the external device to the plurality of absorption refrigerators, the temperature of the cold water supplied from the plurality of absorption refrigerators to the external device, and the flow rate of the cold water flowing through the cold water passage Calculating the amount of heat given to the cold water by the external device,
For each of the plurality of absorption refrigerators, the temperature of the heat medium supplied to the absorption refrigerator, the temperature of the cooling water supplied to the absorption refrigerator, and the temperature characteristics of the absorption refrigerator The absorption refrigeration system according to claim 2, wherein the refrigeration capacity is calculated based on the refrigeration capacity.

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