JP2016057004A - Absorption type refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption type refrigeration system capable of shortening a starting time of an absorption refrigeration machine by early increasing the temperature of a heat medium up to a temperature necessary for starting the absorption type refrigeration machine.SOLUTION: An absorption type refrigeration system 1 includes; a solar heat collector 11 heating a heat medium; three heat storage tanks 12A, 12B, 12c performing heat storage by supplying the heat medium from the solar heat collector, and supplying a heat medium for heating a regenerator of an absorption type refrigeration machine 21; and a system controller 40 variably controlling a heat storage tank 12 to which the heat medium is supplied from the solar heat collector among the three heat storage tanks.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). This absorption refrigeration system equipped with an absorption chiller includes a heat storage tank that supplies a heat medium to the regenerator of the absorption chiller, and exhaust gas from various engines, boiler steam, or heat from the sun. Heat can be stored in the heat storage tank by supplying the collected heat medium.

JP 2014-035139 A

  By the way, the absorption refrigerator has a minimum heat temperature at which it can be started, and if the temperature of the heat storage tank does not reach the specified temperature, the absorption refrigerator cannot be started. There's a problem. Moreover, when the capacity | capacitance of a thermal storage tank is large, there exists a problem that many time is required until it rises to a regulation temperature. In particular, when using solar heat, the temperature of the heat storage tank depends on the amount of solar radiation. For this reason, when the amount of solar radiation is small, it takes a long time to rise to the specified temperature.

  The present invention has been made in view of such circumstances, and its purpose is to quickly raise the temperature of the heating medium to a temperature necessary for starting the absorption refrigerator, thereby starting the absorption refrigerator. An absorption refrigeration system that can shorten the time is provided.

  In order to solve this problem, the present invention provides an absorption refrigeration system that obtains cold water from an absorption chiller by a circulation cycle using an evaporator, an absorber, a regenerator, and a condenser. In this absorption refrigeration system, a heat collector that heats the heat medium and a heat medium that is supplied from the heat collector respectively store heat and supply a heat medium that heats the regenerator of the absorption refrigeration machine. A plurality of heat storage tanks and a controller that variably controls the heat storage tanks supplied with the heat medium from the heat collector in the plurality of heat storage tanks.

  Here, in this invention, it is preferable that the 1st heat storage tank is connected to an absorption refrigerating machine among several heat storage tanks, and the remaining heat storage tank is connected in series with the 1st heat storage tank. And it is desirable for a controller to control supply of the heat medium from a heat collector so that a 1st heat storage tank may become the highest temperature among several heat storage tanks based on the temperature of each of several heat storage tanks.

  In the present invention, the controller preferentially supplies the heat medium from the heat collector to the first heat storage tank, and after the first heat storage tank satisfies a certain temperature condition, It is preferable to supply the medium in order from the remaining heat storage tanks closer to the first heat storage tank.

  Moreover, in this invention, it is preferable that a controller variably controls the heat storage tank in which the heat medium utilized in the absorption refrigerator returns.

  In the present invention, the controller is configured such that the first heat storage tank has the highest temperature among the plurality of heat storage tanks based on the temperature of each of the plurality of heat storage tanks and the temperature of the heat medium returning from the absorption refrigerator. It is preferable to control the return of the heat medium from the absorption refrigerator.

  In the present invention, the heat collector is preferably a solar heat collector that heats the heat medium by receiving sunlight. In this case, the absorption refrigerator absorbs the refrigerant evaporated in the evaporator with the absorbing liquid in the absorber, and supplies the absorbing liquid that has absorbed the refrigerant to the regenerator and is supplied from the absorber to the regenerator. It is desirable to warm the absorbing liquid to be heated by the heat medium supplied from the first heat storage tank.

  According to the present invention, since the heat medium can be divided into a plurality of heat storage tanks, the capacity of the heat medium borne by each heat storage tank can be reduced. Thereby, the temperature of each thermal storage tank can be raised rapidly. In addition, by variably controlling the heat storage tank to which the heat medium is supplied from the heat collector, it is not possible to store heat in all the heat storage tanks at the same time, but to store heat concentrated on the necessary heat storage tanks. it can. For example, the heat of the heat collector can be concentrated in one heat storage tank and a heat medium having a required temperature can be quickly stored. Thereby, the temperature of the heat medium can be raised quickly to a temperature necessary for starting the absorption chiller, and the startup time of the absorption chiller can be shortened. Therefore, the operating rate of the absorption refrigerator can be improved.

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 Flow chart showing control method of absorption refrigeration system Flow chart showing control method of absorption refrigeration system Explanatory drawing which shows transition of the temperature of each heat storage tank in the condition where the heat-medium pump is not working Explanatory drawing which shows transition of the temperature of each heat storage tank in the condition where the heat medium pump is operating Explanatory drawing which shows transition of the temperature of each heat storage tank in the condition where the heat medium pump is operating Configuration diagram schematically showing absorption refrigeration system

(First embodiment)
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 plurality of heat storage tanks 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 plurality of heat storage tanks 12 are each configured independently, and in the present embodiment, the plurality of heat storage tanks 12 are configured by three heat storage tanks 12. Hereinafter, the three heat storage tanks 12 shown in the figure are referred to as a first heat storage tank 12A, a second heat storage tank 12B, and a third heat storage tank 12C in order from the left side. Is used.

  Each heat storage tank 12 stores heat collected by the solar heat collector 11, and is a tank that stores therein, for example, 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 solar heat collector 11 through the three heat storage tanks 12 to the solar heat collector 11 again, and the three heat storage tanks 12 are connected to the solar heat collector 11. They are arranged in parallel. 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 first heat collecting flow path 13 a supplies the heat medium that has flowed out of the three heat storage tanks 12 to one and then supplies the heat medium to the solar heat collector 11. In the first heat collecting flow path 13a, the first heat medium outlet valve 15A is provided in the flow path from which the heat medium flows out from the first heat storage tank 12A, and the second heat is supplied in the flow path from which the heat medium flows out from the second heat storage tank 12B. The medium outlet valve 15B is provided with a third heat medium outlet valve 15C in the flow path through which the heat medium flows out from the third heat storage tank 12C.

  Further, the second heat collecting flow path 13b divides the heat medium flowing out from the solar heat collector 11 into three and supplies the heat medium to each heat storage tank 12. In the second heat collecting flow path 13b, the first heat medium inlet valve 16A is provided in the flow path where the heat medium flows into the first heat storage tank 12A, and the second heat is input in the flow path where the heat medium flows into the second heat storage tank 12B. The medium inlet valve 16B is provided with a third heat medium inlet valve 16C in the flow path through which the heat medium flows into the third heat storage tank 12C.

  Furthermore, the first heat storage tank 12A and the second heat storage tank 12B are communicated with each other through a flow path, and a first communication valve 18A is provided in the flow path. Moreover, the 2nd heat storage tank 12B and the 3rd heat storage tank 12C are connected by the flow path, and the 2nd communication valve 18B is provided in the said flow path.

  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. A heat medium that circulates between the refrigerators 21 may be used separately. 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. In the indirect heat collection type configuration, the first to third heat medium outlet valves 15A, 15B, and 15C described above can be omitted (see FIG. 9).

  The second system 20 is for obtaining cold water used in an indoor unit 31 to be described later, and includes a plurality of absorption refrigeration machines 21, a heat medium flow path 22, and a heat medium pump 23. . 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.

  The plurality of absorption chillers 21 are configured independently of each other. In the present embodiment, the absorption chillers 21 include three absorption chillers 21 corresponding to the number of heat storage tanks 12. Hereinafter, the three absorption refrigeration machines 21 shown in the figure are referred to as a first absorption refrigeration machine 21A, a second absorption refrigeration machine 21B, and a third absorption refrigeration machine 21C in this order from the left side. These designations are used when referring to 21.

  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 101, the condenser 102, the evaporator 103, and the absorber 104. 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. In addition, in FIG. 1, description of the cooling tower 25 and the cooling water flow path 26 is abbreviate | omitted.

  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 the indoor unit 31 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.

  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 normal cooling operation (normally, 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 first heat medium flow path 22a divides the heat medium flowing out from the first heat storage tank 12A into three and supplies the heat medium to each absorption refrigerator 21.

  The second heat medium flow path 22b joins the heat medium flowing out from the three absorption refrigeration machines 21 into one, then branches the merged heat medium into three, and then into each heat storage tank 12 Supply. In the second heat medium flow path 22b, the fourth heat medium inlet valve 17A is provided in the flow path where the heat medium flows into the first heat storage tank 12A, and the fifth flow path is provided in the flow path where the heat medium flows into the second heat storage tank 12B. A heat medium inlet valve 17B is provided with a sixth heat medium inlet valve 17C in the flow path through which the heat medium flows into the third heat storage tank 12C.

  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. In the present embodiment, a heat medium pump 23 is provided for each of the three absorption refrigerators 21.

  The third system 30 supplies cold water obtained by the absorption refrigerator 21 to the indoor unit 31, and includes one or more (for example, five) indoor units 31, a cold water flow path 32, and a cold water pump. 33.

  Each indoor unit 31 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, and the individual indoor units 31 are connected in parallel.
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 sensors 41A, 41B, 41C are sensors that detect the temperature of each of the heat storage tanks 12A, 12B, 12C, and output a signal corresponding to the temperature to the system controller 40. The heat medium outlet temperature sensor 42 is a sensor that detects the temperature of the heat medium flowing out of the absorption refrigerator 21 (heat medium outlet temperature), and outputs a signal corresponding to the heat medium outlet temperature to the system controller 40.

  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 three 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 three 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.

  As one of the features of this embodiment, the system controller 40 variably controls the heat storage tank 12 to which the heat medium is supplied from the solar heat collector 11 among the three heat storage tanks 12A, 12B, and 12C. Further, the system controller 40 variably controls the heat storage tank 12 from which the heat medium used in the absorption refrigerator 21 returns, among the three heat storage tanks 12A, 12B, and 12C.

  Hereinafter, a control method of the absorption refrigeration system 1 will be described. First, a control method for returning the heat medium from the solar heat collector 11 to the appropriate heat storage tank 12 will be described. In the present embodiment, the system controller 40 is configured such that the first heat storage tank 12A is the most among the three heat storage tanks 12A, 12B, and 12C based on the temperatures TA, TB, and TC of the three heat storage tanks 12A, 12B, and 12C, respectively. The supply of the heat medium from the solar heat collector 11 is controlled so that the temperature becomes high. In this case, the system controller 40 preferentially supplies the heat medium from the solar heat collector 11 to the first heat storage tank 12A, and after the first heat storage tank 12A satisfies a certain temperature condition, the remaining heat storage The heating medium is supplied from the solar heat collector 11 in order from the tank 12B, 12C closer to the first heat storage tank 12A. Here, FIG. 3 and FIG. 4 are flowcharts 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 determines whether or not the heat medium pump 23 is operating. Since the heat medium pump 23 is not operating before the absorption chiller 21 is started, a negative determination is made in step 10, and the process proceeds to step 11 (S11) and subsequent steps. On the other hand, since the heat medium pump 23 is also in operation after the absorption refrigerator 21 is started, an affirmative determination is made in step 10 and the process proceeds to step 17 (S17) and subsequent steps.

  In step 11, the system controller 40 determines whether or not the temperature TA of the first heat storage tank 12A is equal to or lower than the temperature (requested temperature) THA required for the first heat storage tank 12A. When the temperature TA of the first heat storage tank 12A is equal to or lower than the required temperature THA, an affirmative determination is made in step 11, and the process proceeds to step 14 (S14). On the other hand, when the temperature TA of the first heat storage tank 12A is higher than the required temperature THA, a negative determination is made in step 11, and the process proceeds to step 12 (S12).

  In step 12, the system controller 40 determines whether or not the temperature TB of the second heat storage tank 12B is equal to or lower than the required temperature THA of the first heat storage tank 12A. When the temperature TB of the second heat storage tank 12B is equal to or lower than the required temperature THA of the first heat storage tank 12A, an affirmative determination is made in step 12, and the process proceeds to step 15 (S15). On the other hand, when the temperature TB of the second heat storage tank 12B is higher than the required temperature THA of the first heat storage tank 12A, a negative determination is made in step 12, and the process proceeds to step 13 (S13).

  In step 13, the system controller 40 determines whether or not the temperature TC of the third heat storage tank 12C is equal to or lower than the required temperature THA of the first heat storage tank 12A. When the temperature TC of the third heat storage tank 12C is equal to or lower than the required temperature THA of the first heat storage tank 12A, an affirmative determination is made in step 13 and the process proceeds to step 16 (S16). On the other hand, if the temperature TC of the third heat storage tank 12C is higher than the required temperature THA of the first heat storage tank 12A, a negative determination is made in step 13, and the process proceeds to step 14.

  In step 14, the system controller 40 stores heat in the first heat storage tank 12 </ b> A that supplies a heat medium to each absorption refrigerator 21, and performs the following control. Specifically, the system controller 40 opens the first heat medium inlet valve 16A and the first heat medium outlet valve 15A. Further, the system controller 40 closes the second heat medium inlet valve 16B and the second heat medium outlet valve 15B, and closes the third heat medium inlet valve 16C and the third heat medium outlet valve 15C. By this valve control, the heat medium is supplied only from the solar heat collector 11 to the first heat storage tank 12A, and the supply of the heat medium to the second heat storage tank 12B and the third heat storage tank 12C is shut off.

  In step 15, the system controller 40 stores heat in the second heat storage tank 12B located next to the first heat storage tank 12A, and performs the following control. Specifically, the system controller 40 closes the first heat medium inlet valve 16A and the first heat medium outlet valve 15A, and closes the third heat medium inlet valve 16C and the third heat medium outlet valve 15C. The system controller 40 opens the second heat medium inlet valve 16B and the second heat medium outlet valve 15B. By this valve control, the heat medium is supplied from the solar heat collector 11 only to the second heat storage tank 12B, and the supply of the heat medium to the first heat storage tank 12A and the third heat storage tank 12C is shut off.

  In step 16, the system controller 40 stores heat in the third heat storage tank 12C located next to the second heat storage tank 12B, and performs the following control. Specifically, the system controller 40 closes the first heat medium inlet valve 16A and the first heat medium outlet valve 15A, and closes the second heat medium inlet valve 16B and the second heat medium outlet valve 15B. Further, the system controller 40 opens the third heat medium inlet valve 16C and the third heat medium outlet valve 15C. By this valve control, the heat medium is supplied from the solar heat collector 11 only to the third heat storage tank 12C, and the supply of the heat medium to the first heat storage tank 12A and the second heat storage tank 12B is shut off.

  In step 17, the system controller 40 determines whether or not the temperature TA of the first heat storage tank 12A is equal to or lower than the temperature TB of the second heat storage tank 12B. When the temperature TA of the first heat storage tank 12A is equal to or lower than the temperature TB of the second heat storage tank 12B, an affirmative determination is made in step 17 and the process proceeds to step 26 (S26). On the other hand, when the temperature TA of the first heat storage tank 12A is higher than the temperature TB of the second heat storage tank 12B, a negative determination is made in step 17, and the process proceeds to step 18 (S18).

  In step 18, the system controller 40 determines whether or not the temperature TB of the second heat storage tank 12B is equal to or lower than the temperature TC of the third heat storage tank 12C. When the temperature TB of the second heat storage tank 12B is equal to or lower than the temperature TC of the third heat storage tank 12C, an affirmative determination is made in step 18 and the process proceeds to step 27 (S27). On the other hand, when the temperature TB of the second heat storage tank 12B is higher than the temperature TC of the third heat storage tank 12C, a negative determination is made in step 18, and the process proceeds to step 19 (S19).

  In step 19, the system controller 40 performs a temperature determination on the temperature TA of the first heat storage tank 12A. Specifically, the system controller 40 compares the temperature TA of the first heat storage tank 12A, the required temperature THA of the first heat storage tank 12A, and the required minimum temperature TLA of the first heat storage tank 12A. Here, the required minimum temperature TLA of the first heat storage tank 12A is a temperature at which it is determined that heat storage is not required if the temperature of the first heat storage tank 12A is lower than the required temperature THA if the temperature is higher than that temperature (THA). > TLA).

  First, when the temperature TA of the first heat storage tank 12A is equal to or lower than the required minimum temperature TLA (TA ≦ TLA), the process proceeds to step 26. On the other hand, when the temperature TA of the first heat storage tank 12A is higher than the required minimum temperature TLA but lower than the required temperature THA (TLA <TA <THA), the process proceeds to step 20 (S20). When the temperature TA of the first heat storage tank 12A is equal to or higher than the required temperature THA (THA ≦ TA), the process proceeds to step 21 (S21).

  In step 20, the system controller 40 determines whether or not each of the heat medium inlet valves 16A, 16B, and 16C and each of the heat medium outlet valves 15A, 15B, and 15C are closed. If each of the heat medium inlet valves 16A, 16B, 16C and each of the heat medium outlet valves 15A, 15B, 15C are closed, an affirmative determination is made in step 20, and the process proceeds to step 26. On the other hand, if any of the heat medium inlet valves 16A, 16B, 16C and the heat medium outlet valves 15A, 15B, 15C is not closed, a negative determination is made in step 20, and the process proceeds to step 25 (S25).

  In step 21, the system controller 40 performs a temperature determination on the temperature TB of the second heat storage tank 12B. Specifically, the system controller 40 compares the temperature TB of the second heat storage tank 12B, the required temperature THB of the second heat storage tank 12B, and the required minimum temperature TLB of the second heat storage tank 12B. Here, the required temperature THB of the second heat storage tank 12B is a temperature required for the second heat storage tank 12B. The required minimum temperature TLB of the second heat storage tank 12B is a temperature at which it is determined that heat storage is not required if the temperature of the second heat storage tank 12B is lower than the required temperature THB (THB> TLB). . For example, the required temperature THB and the required minimum temperature TLB of the second heat storage tank 12B can be the same as the required temperature THA and the required minimum temperature TLA of the first heat storage tank 12A.

  First, when the temperature TB of the second heat storage tank 12B is equal to or lower than the required minimum temperature TLB (TB ≦ TLB), the process proceeds to step 27. On the other hand, when the temperature TB of the second heat storage tank 12B is higher than the required minimum temperature TLB but lower than the required temperature THB (TLB <TB <THB), the process proceeds to step 22 (S22). When the temperature TB of the second heat storage tank 12B is equal to or higher than the required temperature THB (THB ≦ TB), the process proceeds to step 23 (S23).

  In step 22, the system controller 40 determines whether or not each of the heat medium inlet valves 16A, 16B, and 16C and each of the heat medium outlet valves 15A, 15B, and 15C are closed. If each of the heat medium inlet valves 16A, 16B, 16C and each of the heat medium outlet valves 15A, 15B, 15C are closed, an affirmative determination is made in step 22 and the process proceeds to step 27. On the other hand, if any of the heat medium inlet valves 16A, 16B, 16C and the heat medium outlet valves 15A, 15B, 15C is not closed, a negative determination is made in step 22, and the process proceeds to step 25.

  In step 23, the system controller 40 performs temperature determination on the temperature TC of the third heat storage tank 12C. Specifically, the system controller 40 compares the temperature TC of the third heat storage tank 12C, the required temperature THC of the third heat storage tank 12C, and the required minimum temperature TLC of the third heat storage tank 12C. Here, the required temperature THC of the third heat storage tank 12C is a temperature required for the third heat storage tank 12C. The required minimum temperature TLC of the third heat storage tank 12C is a temperature at which it is determined that heat storage is not required if the temperature of the third heat storage tank 12C is lower than the required temperature THC (THC> TLC). . For example, the required temperature THC and the required minimum temperature TLC of the third heat storage tank 12C can be the same as the required temperature THA and the required minimum temperature TLA of the first heat storage tank 12A.

  First, when the temperature TC of the third heat storage tank 12C is equal to or lower than the required minimum temperature TLC (TC ≦ TLC), the process proceeds to step 28 (S28). On the other hand, when the temperature TC of the third heat storage tank 12C is higher than the required minimum temperature TLC but lower than the required temperature THC (TLC <TC <THC), the process proceeds to step 24 (S24). When the temperature TC of the third heat storage tank 12C is equal to or higher than the required temperature THC (THC ≦ TC), the process proceeds to step 26.

  In step 24, the system controller 40 determines whether or not each of the heat medium inlet valves 16A, 16B, and 16C and each of the heat medium outlet valves 15A, 15B, and 15C are closed. If each of the heat medium inlet valves 16A, 16B, 16C and each of the heat medium outlet valves 15A, 15B, 15C are closed, an affirmative determination is made in step 24, and the process proceeds to step 28. On the other hand, if any of the heat medium inlet valves 16A, 16B, 16C and the heat medium outlet valves 15A, 15B, 15C is not closed, a negative determination is made in step 24, and the process proceeds to step 25.

  In step 25, the system controller 40 maintains the current valve state for each heat medium inlet valve 16A, 16B, 16C and each heat medium outlet valve 15A, 15B, 15C.

  In step 26, the system controller 40 stores heat in the first heat storage tank 12 </ b> A that supplies a heat medium to each absorption refrigerator 21, and performs the following control. Specifically, the system controller 40 opens the first heat medium inlet valve 16A and the first heat medium outlet valve 15A. Further, the system controller 40 closes the second heat medium inlet valve 16B and the second heat medium outlet valve 15B, and closes the third heat medium inlet valve 16C and the third heat medium outlet valve 15C. By this valve control, the heat medium is supplied only from the solar heat collector 11 to the first heat storage tank 12A, and the supply of the heat medium to the second heat storage tank 12B and the third heat storage tank 12C is shut off.

  In step 27, the system controller 40 stores heat in the second heat storage tank 12B located next to the first heat storage tank 12A, and performs the following control. Specifically, the system controller 40 closes the first heat medium inlet valve 16A and the first heat medium outlet valve 15A, and closes the third heat medium inlet valve 16C and the third heat medium outlet valve 15C. The system controller 40 opens the second heat medium inlet valve 16B and the second heat medium outlet valve 15B. By this valve control, the heat medium is supplied from the solar heat collector 11 only to the second heat storage tank 12B, and the supply of the heat medium to the first heat storage tank 12A and the third heat storage tank 12C is shut off.

  In step 28, the system controller 40 stores heat in the third heat storage tank 12C located next to the second heat storage tank 12B, and performs the following control. Specifically, the system controller 40 closes the first heat medium inlet valve 16A and the first heat medium outlet valve 15A, and closes the second heat medium inlet valve 16B and the second heat medium outlet valve 15B. Further, the system controller 40 opens the third heat medium inlet valve 16C and the third heat medium outlet valve 15C. By this valve control, the heat medium is supplied from the solar heat collector 11 only to the third heat storage tank 12C, and the supply of the heat medium to the first heat storage tank 12A and the second heat storage tank 12B is shut off.

  Next, a control method for returning the heat medium from the absorption refrigerator 21 to the appropriate heat storage tank 12 will be described. Specifically, the system controller 40 variably controls the heat storage tank 12 from which the heat medium used by the absorption refrigerator 21 returns, among the three heat storage tanks 12A, 12B, and 12C. In particular, the system controller 40 has three heat storage tanks 12A, 12B based on the temperature TA, TB, TC of each of the three heat storage tanks 12A, 12B, 12C and the temperature T1 of the heat medium returning from the absorption chiller 21. , 12C, the return of the heat medium from the absorption refrigerator 21 is controlled so that the first heat storage tank 12A has the highest temperature. Here, FIG. 5 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 30 (S30), the system controller 40 determines whether or not the heat medium outlet temperature T1 is equal to or lower than the temperature TC of the third heat storage tank 12C. When the heat medium outlet temperature T1 is equal to or lower than the temperature TC of the third heat storage tank 12C, an affirmative determination is made in step 30, and the process proceeds to step 35 (S35). On the other hand, if the heat medium outlet temperature T1 is higher than the temperature TC of the third heat storage tank 12C, a negative determination is made in step 30, and the process proceeds to step 31 (S31).

  In step 31, the system controller 40 determines whether or not the heat medium outlet temperature T1 is equal to or lower than the temperature TB of the second heat storage tank 12B. If the heat medium outlet temperature T1 is equal to or lower than the temperature TB of the second heat storage tank 12B, an affirmative determination is made in step 31 and the process proceeds to step 34 (S34). On the other hand, when the heat medium outlet temperature T1 is higher than the temperature TB of the second heat storage tank 12B, a negative determination is made in step 31, and the process proceeds to step 33 (S33).

  In step 33, the system controller 40 performs the following control to return the heat medium to the first heat storage tank 12A. Specifically, the system controller 40 opens the fourth heat medium inlet valve 17A and closes the fifth heat medium inlet valve 17B, the sixth heat medium inlet valve 17C, the first communication valve 18A, and the second communication valve 18B. By this valve control, the heat medium is returned only to the first heat storage tank 12A.

  In step 34, the system controller 40 performs the following control to return the heat medium to the second heat storage tank 12B. Specifically, the system controller 40 opens the fifth heat medium inlet valve 17B and the first communication valve 18A, and closes the fourth heat medium inlet valve 17A, the sixth heat medium inlet valve 17C, and the second communication valve 18B. By this valve control, the heat medium is returned to the second heat storage tank 12A. Moreover, the heat medium which existed in the 2nd heat storage tank can be sent to 12A of 1st heat storage tanks by opening the 1st communication valve 18A.

  In step 35, the system controller 40 performs the following control to return the heat medium to the third heat storage tank 12C. Specifically, the system controller 40 opens the sixth heat medium inlet valve 17C, the first communication valve 18A, and the second communication valve 18B, and closes the fifth heat medium inlet valve 17B and the fourth heat medium inlet valve 17A. By this valve control, the heat medium is returned to the third heat storage tank 12C. In addition, by opening the first communication valve 18A and the second communication valve 18B, the heat medium in the third heat storage tank 12C is transferred to the second heat storage tank 12B, and the heat medium in the second heat storage tank 12B is transferred to the first heat storage tank. It can send to the tank 12A in order.

  3 and 4, the heat storage tank 12 to which the heat medium is supplied from the solar heat collector 11 is appropriately switched among the three heat storage tanks 12A, 12B, and 12C.

  FIG. 6 is an explanatory diagram showing transitions of the temperatures TA, TB, and TC of the heat storage tanks 12A, 12B, and 12C when the heat medium pump 23 is not operating. When the heat medium pump 23 is not operating, the first heat storage tank 12A that supplies the heat medium to the absorption refrigeration machine 21 is quickly stored by performing the processing from step 11 to step 16, and then the second heat storage. The tank 12B and the third heat storage tank 12C can be stored in order. In addition, the heat storage tanks 12A, 12B, and 12C store heat independently, so that the heat medium flowing out from the heat storage tanks 12A, 12B, and 12C is mixed and the temperature of the heat medium flowing into the solar heat collector 11 Can be suppressed. For this reason, the situation where the temperature of the heat medium collected by the solar heat collector 11 becomes lower than the temperature of the first heat storage tank 12A and the temperature of the first heat storage tank 12A does not rise can be suppressed. As a result, the first heat storage tank 12A that supplies the heat medium to the absorption refrigeration machine 21 stores heat so that the temperature becomes the fastest first, and then the second heat storage tank 12B, the third heat storage tank 12A in the order closer to the first heat storage tank 12A. The heat storage tank 12C can be stored in order.

  7 and 8 are explanatory diagrams showing transitions of the temperatures TA, TB, TC and the heat medium outlet temperature T1 of the heat storage tanks 12A, 12B, 12C in a state where the heat medium pump 23 is operating. Here, FIG. 7 shows the temperature transition in a situation where the required temperatures THA, THB, THC and the required minimum temperatures TLA, TLB, TLC are set identically, and FIG. 8 shows the required temperatures THA, THB. , THC, and required minimum temperatures TLA, TLB, TLC show temperature transitions in a state where THA> THB> THC and TLA> TLB> TLC are set to be in a relationship.

  When the absorption chiller 21 is operating, the heat medium returning from the absorption chiller 21 is lower than the temperature at the time of supply and returns to the first heat storage tank 12A, so the first heat storage tank 12A. Temperature drops. Further, depending on the route through which the heat medium returns, the relationship TA ≧ TB ≧ TC may not be established. Therefore, as shown in the processing from step 17 to step 28, first, the temperatures of the respective heat storage tanks 12 are compared so as to satisfy the condition of TA ≧ TB ≧ TC. And the heat storage tank 12 which stores heat is determined, and 12 A of 1st heat storage tanks are made higher temperature than the other heat storage tanks 12B and 12C. When the first heat storage tank 12A satisfies a certain temperature condition, the second heat storage tank 12B and the third heat storage tank 12C are similarly stored.

  In addition, by providing the required minimum temperature values TLA, TLB, TLC, even if the temperature TA of the first heat storage tank 12A is lower than the required temperature THA, the required minimum temperature is not reached if it is greater than the required minimum temperature TLA. Heat storage can be performed in the heat storage tanks 12B and 12C. During this heating, the temperature TA of the first heat storage tank 12A decreases to the required minimum temperature TLA due to the return of the heat medium from the absorption refrigerator 21, or the temperature TA of the first heat storage tank 12A decreases to the second heat storage tank. When the temperature decreases to 12B or less, the heat storage destination is switched from the second heat storage tank 12B to the first heat storage tank 12A, and heat storage is performed on the first heat storage tank 12A until the temperature reaches the required temperature THA. The second heat storage tank 12B and the third heat storage tank 12C are similarly controlled.

  Thereby, the 1st heat storage tank 12A which supplies a heat medium to the absorption refrigeration machine 21 is heat-stored so that it may become the fastest temperature first, and then the 2nd heat storage tank 12B and the 3rd in order close to the 1st heat storage tank 12A. The heat storage tank 12C can be stored in order.

  Further, the heat storage tanks 12A, 12B, and 12C to which the heat medium from the absorption chiller 21 is returned are appropriately switched by a series of processes shown in FIG. When the absorption chiller 21 is operating, the heat medium returning from the absorption chiller 21 is lower than the temperature at the time of supply and returns to the heat storage tank 12, so that the temperature of the heat storage tank 12 decreases. In the present embodiment, the first heat storage tank 12A that supplies the heat medium to the absorption refrigeration machine 21 is desired to be the hottest heat storage tank, so that the decrease in the temperature TA can be suppressed as much as possible.

  As described above, in the present embodiment, the absorption refrigeration system 1 stores the solar heat collector 11 that heats the heat medium and the heat medium supplied from the solar heat collector 11 to store heat. Three heat storage tanks 12A, 12B, and 12C for supplying a heat medium for heating the regenerator 101 and three heat storage tanks 12A, 12B, and 12C are connected to the heat storage tank 12 for supplying the heat medium from the solar heat collector 11. The system controller 40 is variably controlled.

  According to this configuration, since the heat medium can be divided into the three heat storage tanks 12A, 12B, and 12C, the capacity of the heat medium that each heat storage tank 12A, 12B, and 12C bears can be reduced. it can. Thereby, the temperature of each thermal storage tank 12A, 12B, 12C can be raised rapidly. Further, by variably controlling the heat storage tank 12 to which the heat medium is supplied from the solar heat collector 11, not all the heat storage tanks 12A, 12B, and 12C store heat simultaneously, but the necessary heat storage tanks 12A and 12B. , 12C can be concentrated heat storage. For example, the heat of the solar heat collector 11 can be concentrated in one heat storage tank 12 to quickly store a heat medium having a necessary temperature. Thereby, the temperature of the heat medium can be raised quickly to a temperature necessary for starting up the absorption chiller 21, and the startup time of the absorption chiller 21 can be shortened. Therefore, the operating rate of the absorption refrigerator 21 can be improved.

  Moreover, in this embodiment, although the solar-heat collector 11 is utilized, according to the above-mentioned structure, it can make it easy to raise the temperature of the thermal storage tank 12 even if it is an environment with little solar radiation amount. Further, when the amount of heat is insufficient with only the solar heat collector 11, it is necessary to add an auxiliary boiler. However, in this embodiment, since the temperature of the heat storage tank 12 is easy to raise, it is not necessary to install an auxiliary boiler, and even when an auxiliary boiler is installed, the frequency with which the auxiliary boiler is chased is increased. Can be suppressed. As a result, useless chasing can be reduced and fuel consumption can be suppressed.

  Moreover, in this embodiment, the 1st heat storage tank 12A is connected to the absorption refrigerating machine 21 among the three heat storage tanks 12A, 12B, and 12C, and the remaining heat storage tanks 12B and 12C are serially connected to the first heat storage tank 12A. It is connected to the. Based on the temperature of each of the three heat storage tanks 12A, 12B, and 12C, the system controller 40 sets the solar heat collector 11 so that the first heat storage tank 12A has the highest temperature among the three heat storage tanks 12A, 12B, and 12C. The supply of the heat medium from is controlled.

  According to this configuration, the heat medium can be supplied so that the first heat storage tank 12 </ b> A that supplies the heat medium to the absorption refrigerator 21 has the highest temperature. Thereby, the temperature of the heat medium can be raised quickly to a temperature required to start up the absorption chiller 21, and the startup time of the absorption chiller 21 can be shortened. Therefore, the operating rate of the absorption refrigerator 21 can be improved.

  In the present embodiment, the system controller 40 preferentially supplies the heat medium from the solar heat collector 11 to the first heat storage tank 12A, and the first heat storage tank 12A has a certain temperature condition (required temperature THA). ) Is satisfied, the heating medium is supplied from the solar heat collector 11 in order from the remaining heat storage tanks 12B and 12C closer to the first heat storage tank 12A.

  According to this configuration, the heat medium can be supplied so that the first heat storage tank 12 </ b> A that supplies the heat medium to the absorption refrigerator 21 has the highest temperature. Moreover, if heat storage of 12 A of 1st heat storage tanks is made enough, after that, heat storage can be sequentially performed with respect to the 2nd heat storage tank 12B and the 3rd heat storage tank 12C. Thereby, the heat storage of the whole system can be performed appropriately.

  In the present embodiment, the system controller 40 variably controls the heat storage tank 12 to which the heat medium used by the absorption refrigerator 21 returns, among the three heat storage tanks 12A, 12B, and 12C. .

  The heat medium utilized in the absorption refrigerator 21 returns to the heat storage tank 12 in a state where the temperature is lowered. Thus, the situation where the temperature of 12 A of 1st heat storage tanks falls can be suppressed by variably controlling the heat storage tank 12 in which a heat carrier returns. Thereby, the operating rate and output of the absorption refrigerator 21 can be improved.

  Further, in the present embodiment, the system controller 40 includes three heat storage tanks 12A, 12B, and 12C based on the temperatures TA, TB, and TC, and the temperature T1 of the heat medium that returns from the absorption refrigerator 21. The return of the heat medium from the absorption chiller 21 is controlled so that the first heat storage tank 12A has the highest temperature among the heat storage tanks 12A, 12B, and 12C.

  According to this configuration, it is possible to suppress a situation in which the temperature of the first heat storage tank 12 </ b> A decreases due to the heat medium returning from the absorption refrigerator 21.

(Second Embodiment)
FIG. 9 is a configuration diagram schematically showing the absorption refrigeration system 1 according to the present embodiment. The absorption refrigeration system 1 according to the second embodiment will be described below. The absorption refrigeration system 1 according to the second embodiment is different from that of the first embodiment in that the heat collection method is an indirect heat collection method. The description overlapping with the first embodiment will be omitted, and the description will focus on the differences.

  Hereinafter, a control method for returning the heat medium from the solar heat collector 11 to the appropriate heat storage tank 12 will be described. This control method is basically the same as the process shown in the first embodiment, but the processes in steps 14 to 16 and steps 26 to 28 are different. Further, in the indirect heat collection type absorption refrigeration system 1, each of the heat storage tanks 12A, 12B, and 12C includes heat exchangers 19A, 19B, and 19C, and a heat medium that circulates through the heat collection passage 13 is used as the heat exchanger 19A. , 19B, 19C to heat the heat storage tanks 12A, 12B, 12C. Further, the heat medium outlet valves 15A, 15B, and 15C shown in the first embodiment are omitted.

  In step 14 and step 26, the system controller 40 stores heat in the first heat storage tank 12 </ b> A that supplies the heat medium to each absorption refrigerator 21, and performs the following control. Specifically, the system controller 40 opens the first heat medium inlet valve 16A, and closes the second heat medium inlet valve 16B and the third heat medium inlet valve 16C. By this valve control, the heat medium is supplied only from the solar heat collector 11 to the first heat storage tank 12A, and the supply of the heat medium to the second heat storage tank 12B and the third heat storage tank 12C is shut off.

  In step 15 and step 27, the system controller 40 stores heat in the first heat storage tank 12A and the second heat storage tank 12B located adjacent thereto, and performs the following control. Specifically, the system controller 40 opens the first heat medium inlet valve 16A and the second heat medium inlet valve 16B, and closes the third heat medium inlet valve 16C. With this valve control, the heat medium is supplied from the solar heat collector 11 to the first heat storage tank 12A and the second heat storage tank 12B, and the supply of the heat medium to the third heat storage tank 12C is shut off.

  In step 16 and step 28, the system controller 40 stores heat in the three heat storage tanks 12A, 12B, and 12C, and performs the following control. Specifically, the system controller 40 opens the first heat medium inlet valve 16A, the second heat medium inlet valve 16B, and the third heat medium inlet valve 16C. By this valve control, the heat medium is supplied from the solar heat collector 11 to the first heat storage tank 12A, the second heat storage tank 12B, and the third heat storage tank 12C, respectively.

  As described above, in the present embodiment, the absorption refrigeration system 1 stores the solar heat collector 11 that heats the heat medium and the heat medium supplied from the solar heat collector 11 to store heat. Three heat storage tanks 12A, 12B, and 12C for supplying a heat medium for heating the regenerator 101 and three heat storage tanks 12A, 12B, and 12C are connected to the heat storage tank 12 for supplying the heat medium from the solar heat collector 11. The system controller 40 is variably controlled.

  According to this configuration, since the heat medium can be divided into the three heat storage tanks 12A, 12B, and 12C, the capacity of the heat medium that each heat storage tank 12A, 12B, and 12C bears can be reduced. it can. Thereby, the temperature of each thermal storage tank 12A, 12B, 12C can be raised rapidly. Further, by variably controlling the heat storage tank 12 to which the heat medium is supplied from the solar heat collector 11, not all the heat storage tanks 12A, 12B, and 12C store heat simultaneously, but the necessary heat storage tanks 12A and 12B. , 12C can be concentrated heat storage. That is, the heat of the solar heat collector 11 can be concentrated in one heat storage tank 12 and a heat medium having a necessary temperature can be quickly stored. Thereby, the temperature of the heat medium can be raised quickly to a temperature required to start up the absorption chiller 21, and the startup time of the absorption chiller 21 can be shortened. Therefore, the operating rate of the absorption refrigerator 21 can be improved.

  Moreover, in this embodiment which makes a heat collection system an indirect heat collection type, it is not necessary to heat each heat storage tank 12A, 12B, 12C independently. Thereby, the heat storage in each heat storage tank 12A, 12B, 12C can be performed efficiently.

  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 collects and uses the heat of exhaust gas from an engine, or a steam soot system that collects and uses the heat of steam from a boiler or the like.

  Moreover, although 3 heat storage tanks were illustrated in embodiment mentioned above, this invention is applicable to an absorption refrigeration system provided with several heat storage tanks, such as 2 units | sets and 4 units | sets. In the present embodiment, three absorption chillers are illustrated, but it is sufficient that at least one absorption chiller is provided.

  Furthermore, although 5 indoor units were illustrated as an apparatus using cold water in embodiment mentioned above, it is not limited to this, 1 thru | or 4 units | sets or 6 or more 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. Further, the cooling tower (cooler) 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.

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

Claims (6)

In an absorption refrigeration system that obtains cold water from an absorption chiller by a circulation cycle by an evaporator, an absorber, a regenerator and a condenser,
A heat collector for heating the heat medium;
A plurality of heat storage tanks each supplying a heat medium for supplying a heat medium for supplying the heat medium for heating the regenerator of the absorption refrigeration machine by supplying heat medium from the heat collector, respectively,
A controller that variably controls a heat storage tank to which a heat medium is supplied from the heat collector in the plurality of heat storage tanks;
An absorption refrigeration system comprising: Of the plurality of heat storage tanks, the first heat storage tank is connected to the absorption refrigerator, and the remaining heat storage tank is connected in series to the first heat storage tank,
The controller controls the supply of the heat medium from the heat collector based on the temperature of each of the plurality of heat storage tanks so that the first heat storage tank has the highest temperature among the plurality of heat storage tanks. The absorption refrigeration system according to claim 1.   The controller preferentially supplies the heat medium from the heat collector to the first heat storage tank, and the heat medium from the heat collector after the first heat storage tank satisfies a certain temperature condition. The absorption refrigeration system according to claim 2, wherein the supply is performed in order from the remaining heat storage tanks closer to the first heat storage tank.   The absorption according to claim 2 or 3, wherein the controller variably controls a heat storage tank in which the heat medium used by the absorption refrigerator returns, among the plurality of heat storage tanks. Refrigeration system.   The controller is configured so that the first heat storage tank has the highest temperature among the plurality of heat storage tanks based on the temperature of each of the plurality of heat storage tanks and the temperature of the heat medium returning from the absorption refrigerator. The absorption refrigeration system according to claim 4, wherein the return of the heat medium from the absorption chiller is controlled. The heat collector is a solar heat collector that heats the heat medium by receiving sunlight.
The absorption refrigerator absorbs the refrigerant evaporated in the evaporator with an absorption liquid in the absorber, and supplies the absorption liquid that has absorbed the refrigerant to the regenerator, and from the absorber to the regenerator. The absorption refrigeration system according to any one of claims 2 to 5, wherein the supplied absorption liquid is warmed by a heat medium supplied from the first heat storage tank.

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