JP2016200323A - Refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration system that can inhibit an excessive temperature rise of a heating medium to be supplied to an adsorber when a refrigerant in a refrigeration cycle is recovered to a refrigerant storage tank.SOLUTION: When a refrigerant in an adsorption type refrigeration cycle is recovered to a refrigerant storage tank, a refrigerant storage tank 80 is communicated with recirculation piping 15e of the refrigeration cycle 10. At this time, hot water is supplied to a first adsorber that becomes a desorption mode out of respective adsorbers 11, 12, and cooling water is supplied to a condenser 13. Cooling water is supplied to a second adsorber that becomes an adsorption mode out of the respective adsorbers 11, 12, and supply of heat exchange fluid to an evaporator is stopped. In this state, the desorption mode and the absorption mode of the respective adsorbers 11, 12 are repeated by respective four-way valves 71, 72.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a refrigeration system including an adsorption refrigeration cycle.

  Conventionally, when the operation of the adsorption refrigeration cycle is stopped, the refrigerant is desorbed from the adsorbent, and the refrigerant recovery control is performed to collect the refrigerant in the refrigeration cycle in the refrigerant storage tank, thereby causing condensation in the cycle component equipment. There is known a refrigeration system that suppresses (see, for example, Patent Document 1).

  In the refrigeration system described in Patent Document 1, hot water is supplied to an adsorber in the desorption process and cooling water is supplied to a condenser that condenses the desorbed refrigerant during refrigerant recovery. Then, the supply of the cooling water to the adsorber in the adsorption process is stopped, and the supply of the cooling target fluid to the evaporator that evaporates the refrigerant is stopped. In this state, the adsorption / desorption of the refrigerant in the adsorber is repeated, so that the refrigerant from the adsorber is desorbed while suppressing the adsorption of the refrigerant to the adsorbent of the adsorber.

JP2013-156002A

  By the way, as in Patent Document 1, when the cooling water supply to the adsorber in the adsorption process is stopped at the time of refrigerant recovery, there is no opportunity to cool the adsorber at the time of refrigerant recovery. The amount of heat transferred to the side (heat dissipation) will decrease. For this reason, if a situation occurs in which the heat source of the heating medium continues to generate heat during the recovery of the refrigerant, the temperature of the heating medium rises excessively, causing the boiling of the heating medium or the pressure in the circuit through which the heating medium circulates excessively. There is a concern that Such a situation is not preferable because it adversely affects the performance and safety of the refrigeration system.

  In view of the above points, an object of the present invention is to provide a refrigeration system capable of suppressing an excessive temperature rise of a heating medium supplied to an adsorber when the refrigerant in the refrigeration cycle is collected in the refrigerant storage tank. .

  The present invention includes an adsorption refrigeration cycle (10), a first cooling medium supply unit (40) for supplying a first cooling medium to a condenser, and a cooling target fluid supply unit (40) for supplying a cooling target fluid to an evaporator ( 30), a mode switching unit (70) capable of alternately switching between the desorption mode and the adsorption mode, and a heating medium for heating the adsorbent to the first adsorber in the desorption mode. A heating medium supply unit (60), a second cooling medium supply unit (50) for supplying a second cooling medium for cooling the adsorbent to the second adsorber in the adsorption mode, and a refrigerant in the refrigeration cycle A refrigerant storage tank (80) that stores the refrigerant, an allowed state in which the refrigerant in the refrigeration cycle is allowed to be stored in the refrigerant storage tank, and a prohibited state in which the refrigerant in the refrigeration cycle is prohibited from being stored in the refrigerant storage tank. Connection switching section (9 ) And, when stopping the operation of the refrigeration cycle, and recovery control unit which executes a refrigerant recovery processing (100c), a refrigeration system comprising a target.

  In order to achieve the above object, according to the first aspect of the present invention, the recovery control unit switches to a permissible state by the connection switching unit, and performs the heating medium supply unit and the first cooling medium supply when performing the refrigerant recovery process. The desorption mode and the adsorption mode are alternately switched by the mode switching unit for a plurality of adsorbers in a state where the operation of the cooling target fluid supply unit is stopped while the second cooling medium supply unit is operated. It is said.

  In the present invention, when the refrigerant in the adsorption refrigeration cycle is collected in the refrigerant storage tank, the operation of the cooling target fluid supply unit is stopped while the heating medium supply unit and each cooling medium supply unit are operated. Therefore, a configuration in which the desorption mode and the adsorption mode are alternately switched is adopted.

  According to this, in the first adsorber that is in the desorption mode, the adsorbent absorbs heat from the heating medium when the refrigerant is recovered, so that the desorption of the refrigerant in the adsorbent is promoted. In the condenser, when the refrigerant is recovered, the desorbed refrigerant is condensed by heat exchange between the desorbed refrigerant desorbed from the adsorbent of the first adsorber and the first cooling medium. Since the refrigerant in the refrigeration cycle is allowed to be stored in the refrigerant storage tank during the refrigerant recovery, the refrigerant in the refrigeration cycle can be recovered in the refrigerant storage tank.

  In the evaporator, since the fluid to be cooled is not supplied when the refrigerant is recovered, the refrigerant hardly evaporates, and even if the second cooling medium is supplied to the second adsorber that is in the adsorption mode, In the second adsorber, the adsorbent hardly adsorbs the refrigerant.

  Thus, in the present invention, when the operation of the refrigeration cycle is stopped, the refrigerant adsorbed by each adsorber is desorbed and collected in the refrigerant storage tank. Generation | occurrence | production can be suppressed.

  In particular, in the present invention, when the refrigerant is collected in the refrigerant storage tank, the second cooling medium is supplied to the second adsorber that is in the adsorption mode. It can be cooled sufficiently. For this reason, even if the adsorption mode and the desorption mode are switched alternately, it is possible to prevent the heating medium supplied to the adsorber from being excessively heated. As a result, when recovering the refrigerant in the refrigerant storage tank, it is possible to suppress boiling of the heating medium and excessive increase in pressure in the circuit through which the heating medium circulates, thereby sufficiently improving performance and safety in the refrigeration system. It can be secured.

  In addition, the code | symbol in the parenthesis of each means described in this column and the claim shows an example of a correspondence relationship with the specific means described in the embodiment described later.

It is a whole block diagram in the 1st operation mode of the refrigerating system concerning a 1st embodiment. It is a whole block diagram in the 2nd operation mode of the refrigerating system concerning a 1st embodiment. It is a flowchart which shows the flow of the control processing which the control apparatus of the refrigerating system which concerns on 1st Embodiment performs. It is a flowchart which shows the flow of the refrigerant | coolant collection process which the control apparatus of the refrigeration system which concerns on 1st Embodiment performs. It is a whole block diagram in the refrigerant | coolant collection process of the refrigeration system which concerns on 1st Embodiment. It is a timing chart which shows operation of system constituent equipment at the time of refrigerant recovery processing execution of a control device of a refrigerating system concerning a 1st embodiment. It is a whole block diagram of the refrigeration system which concerns on 2nd Embodiment. It is a timing chart which shows operation of system constituent equipment at the time of refrigerant recovery processing execution of a control device of a refrigerating system concerning a 2nd embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in each of the following embodiments, parts that are the same as or equivalent to the matters described in the preceding embodiment are denoted by the same reference numerals, and the description thereof may be omitted. Moreover, in each embodiment, when only a part of the component is described, the component described in the preceding embodiment can be applied to the other part of the component.

(First embodiment)
In this embodiment, an example in which the refrigeration system of the present invention is applied to a stationary air conditioner will be described. The refrigeration system of the present invention can be applied to a stationary refrigeration apparatus or the like, an air conditioner mounted on a moving body such as a vehicle, or the like.

  The overall configuration of the refrigeration system according to the first embodiment will be described with reference to FIGS. 1 and 2. The refrigeration system according to the present embodiment includes, as main components, a refrigeration cycle 10, a cooling target fluid supply unit 30, a first cooling medium supply unit 40, a second cooling medium supply unit 50, a heating medium supply unit 60, and a mode switching unit 70. The refrigerant storage tank 80, the connection switching unit 90, and the control device 100 are provided.

  The refrigeration cycle 10 includes a first adsorber 11, a second adsorber 12, a condenser 13, an evaporator 14, and a refrigerant circulation path 15, and an adsorption type that obtains a refrigeration capacity by circulating refrigerant through the devices 11 to 14. The refrigeration cycle. In this embodiment, water is used as the refrigerant. Note that alcohol or an alcohol-based aqueous solution may be used as the refrigerant.

  Each of the first and second adsorbers 11, 12 adsorbs a gaseous refrigerant (gas phase refrigerant) by being cooled, and desorbs the adsorbed refrigerant by being heated. It has the 1st, 2nd adsorption | suction core 11b and 12b in which 12a was accommodated.

  Each of the adsorption cores 11b and 12b has a plurality of tubes through which the heating medium and the cooling medium circulate, a header tank that distributes and collects the heating medium and the cooling medium to each tube, and fins joined to the tube surface. It consists of a heat exchanger. Adsorbents 11a and 12a are bonded to the surfaces of the tubes and fins of the adsorption cores 11b and 12b. As the adsorbents 11a and 12a, for example, those whose skeleton is made of aluminum oxide, phosphoric acid, or silicic acid oxide, zeolite, silica gel, activated alumina, or activated carbon can be employed.

  The first adsorber 11 is connected to the evaporator 14 via a first adsorption pipe 15 a constituting the refrigerant circulation path 15. The first adsorber 11 is connected to the condenser 13 via a first desorption pipe 15 b that constitutes the refrigerant circulation path 15.

  The second adsorber 12 is connected to the evaporator 14 via a second adsorption pipe 15 c constituting the refrigerant circulation path 15. The second adsorber 12 is connected to the condenser 13 via a second desorption pipe 15 d that constitutes the refrigerant circulation path 15.

  The condenser 13 condenses the desorbed refrigerant by exchanging heat between the desorbed refrigerant (gas phase refrigerant) desorbed from the adsorbents 11a and 12a of the adsorbers 11 and 12 and the cooling water as the first cooling medium. Heat exchanger. Inside the condenser 13, a tube 13a through which cooling water as a first cooling medium flows is arranged.

  The refrigerant inlet of the condenser 13 is connected to the adsorption cores 11b and 12b of the adsorbers 11 and 12 via the desorption pipes 15b and 15d. The refrigerant outlet portion of the condenser 13 is connected to the evaporator 14 via a reflux pipe 15 e that constitutes the refrigerant circulation path 15.

  The condenser 13 of the present embodiment has a refrigerant inlet portion formed at the top and a refrigerant outlet portion formed at the bottom. Thereby, the gas-phase refrigerant that has flowed into the condenser 13 is condensed inside the condenser 13 to become a liquid-phase refrigerant, and after the liquid-phase refrigerant is stored at the lowest part in the gravity direction of the condenser 13, the refrigerant outlet portion And flows out to the evaporator 14 side.

  It is a heat exchanger that cools the heat exchange fluid by causing the liquid phase refrigerant inside the evaporator 14 to exchange heat with the heat exchange fluid that is the fluid to be cooled and evaporating the refrigerant. Inside the evaporator 14, a tube 14a for circulating a heat exchange fluid is disposed. In the evaporator 14, when the adsorbents 11a and 12a of the respective adsorbers 11 and 12 adsorb the gas-phase refrigerant, the internal pressure of the evaporator 14 decreases, and further, the liquid-phase refrigerant and the heat exchange fluid exchange heat. As a result, the refrigerant evaporates.

  The refrigerant inlet portion of the evaporator 14 is connected to the refrigerant outlet portion of the condenser 13 through the reflux pipe 15e. Moreover, the refrigerant | coolant exit part of the evaporator 14 is connected to the adsorption | suction cores 11b and 12b of each adsorption machine 11 and 12 via each adsorption | suction piping 15a and 15c.

  Each adsorption pipe 15a, 15c has first and second evaporation side check valves 16a, 16c which are opened when the pressure on the evaporator 14 side becomes equal to or higher than the pressure on each adsorber 11, 12 side. Has been placed. Each of the evaporation side check valves 16a and 16c allows the refrigerant to flow from the evaporator 14 side to each of the adsorbers 11 and 12 and allows the refrigerant to flow from each of the adsorbers 11 and 12 to the evaporator 14 side. It has a function to prevent backflow.

  The desorption pipes 15b and 15d have first and second condensing-side check valves 16b and 16d that are opened when the pressure on the adsorbers 11 and 12 becomes equal to or higher than the pressure on the condenser 13, respectively. Has been placed. Each condensation-side check valve 16b, 16d allows the flow of refrigerant from the condenser 13 side to each adsorber 11, 12 side, and allows the refrigerant flow from each adsorber 11, 12 side to the condenser 13 side. It has a function to prevent backflow. Each check valve 16 a to 16 d is a differential pressure valve that is opened and closed by a difference in refrigerant pressure between the adsorbers 11 and 12, the condenser 13, and the evaporator 14.

  In the refrigeration cycle 10 of the present embodiment, when one of the adsorbers 11 and 12 is in a desorption mode in which the refrigerant adsorbed on the adsorbent is desorbed, the other adsorber is used as the adsorbent. It is comprised so that it may become the adsorption mode which adsorb | sucks a refrigerant | coolant. In the refrigeration system of this embodiment, the desorption mode and the adsorption mode can be switched alternately for each of the adsorbers 11 and 12. In the present specification, among the adsorbers 11 and 12, the adsorber that is in the desorption mode is referred to as a “first adsorber”, and the adsorber that is in the adsorption mode is referred to as a “second adsorber”. is there.

  Next, the cooling target fluid supply unit 30 will be described. The cooling target fluid supply unit 30 is a supply unit that supplies a heat exchange fluid that is a cooling target fluid to the tube 14 a disposed inside the evaporator 14. In this embodiment, water or a fluid obtained by mixing water with an antifreeze such as ethylene glycol is employed as the heat exchange fluid.

  The cooling target fluid supply unit 30 of the present embodiment includes an indoor heat exchanger 31, a connection pipe 32 that connects the indoor heat exchanger 31 to the evaporator 14, and a fluid pump 33. The indoor heat exchanger 31 is disposed in a duct (not shown) that communicates with the room that is the air-conditioning target space, and exchanges heat between the blown air blown from the blower 31a and the heat exchange fluid to absorb heat from the blown air. An endothermic heat exchanger that cools air.

  The fluid pump 33 is disposed in the connection pipe 32. The fluid pump 33 is a circulation pump that circulates the heat exchange fluid between the indoor heat exchanger 31 and the evaporator 14. The fluid pump 33 according to the present embodiment is configured so that the heat exchange fluid flowing out from the evaporator 14 flows into the indoor heat exchanger 31 between the outlet side of the evaporator 14 and the inlet side of the indoor heat exchanger 31 in the connection pipe 32. Arranged between. The fluid pump 33 is composed of an electric pump, and its operation (number of rotations) is controlled in accordance with a control signal from the control device 100 described later. The fluid pump 33 according to the present embodiment is a variable flow rate pump that can change the rotation speed (discharge flow rate) in accordance with a control signal from the control device 100 described later.

  Next, the first cooling medium supply unit 40 will be described. The first cooling medium supply unit 40 is a supply unit that supplies cooling water, which is the first cooling medium, to the tube 13 a disposed inside the condenser 13. In the present embodiment, as the first cooling medium, water or a fluid obtained by mixing water with an antifreeze such as ethylene glycol is employed.

  The first cooling medium supply unit 40 of the present embodiment includes a first cooling pipe 41 that allows the first cooling medium to flow into and out of the tube 13 a of the condenser 13, and a cooling water pump 42. The first cooling pipe 41 of the present embodiment is connected to a second cooling pipe 51 to be described later at a site upstream of the condenser 13.

  The cooling water pump 42 is a supply pump that supplies cooling water as a first cooling medium to the condenser 13. The cooling water pump 42 is constituted by an electric pump, and its operation (number of rotations) is controlled in accordance with a control signal from the control device 100 described later. In addition, the cooling water pump 42 of this embodiment is comprised by the flow volume variable type pump which can change rotation speed (discharge flow volume) according to the control signal from the control apparatus 100 mentioned later.

  Here, the cooling water pump 42 of this embodiment is arrange | positioned upstream from the connection part with the 2nd cooling piping 51 in the 1st cooling piping 41. FIG. Therefore, when the cooling water pump 42 is operated, the cooling water is supplied to both the condenser 13 and the second adsorber in the adsorption mode among the adsorbers 11 and 12 through the cooling pipes 41 and 51. Is done. As described above, the cooling water pump 42 of the present embodiment functions as a common supply pump for the cooling medium supply units 40 and 50.

  Next, the second cooling medium supply unit 50 will be described. The 2nd cooling medium supply part 50 is a supply part which supplies the cooling water which is a 2nd cooling medium which cools adsorption agent with respect to the 2nd adsorption device which becomes adsorption mode among each adsorption device 11 and 12. FIG. is there. The 2nd cooling medium supply part 50 of this embodiment has the 2nd cooling piping 51 which connects the cooling water pump 42 and the 2nd adsorption device used as adsorption mode.

  Next, the heating medium supply unit 60 will be described. The heating medium supply unit 60 is a supply unit that circulates and supplies hot water, which is a heating medium for heating the adsorbent, to the first adsorber in the desorption mode among the adsorbers 11 and 12. In this embodiment, water or a fluid obtained by mixing water with an antifreeze such as ethylene glycol is employed as the heating medium.

  The heating medium supply unit 60 of the present embodiment includes a hot water tank 61, a hot water pipe 62 that connects the hot water tank 61 to the first adsorber that is in the desorption mode among the adsorbers 11 and 12, and a hot water pump 63. Have.

  The hot water tank 61 is a tank for storing hot water generated by exhaust heat outside the system. When the amount of exhaust heat outside the system increases, the temperature of the hot water inside the hot water tank 61 rises. The hot water pump 63 is a circulation pump that is arranged in the hot water pipe 62 and circulates the hot water between the hot water tank 61 and the first adsorber that is in the desorption mode. The hot water pump 63 is configured by an electric pump, and its operation (number of rotations) is controlled in accordance with a control signal from the control device 100 described later. The hot water pump 63 of the present embodiment is a variable flow rate pump that can change the rotation speed (discharge flow rate) in accordance with a control signal from the control device 100 described later.

  Next, the mode switching unit 70 will be described. The mode switching unit 70 is a switching device for alternately switching the desorption mode and the adsorption mode for each of the adsorbers 11 and 12. The mode switching unit 70 of the present embodiment includes an inlet-side four-way valve 71 provided on the inlet side of cooling water and hot water that is the second cooling medium of each of the adsorbers 11 and 12, and the first of the adsorbers 11 and 12. 2 It has the exit side four-way valve 72 provided in the outflow side of the cooling water and warm water which are cooling media.

  Each of the four-way valves 71 and 72 has a heat medium flow path through which hot water or cooling water flows, a first heat medium flow path through which cooling water flows through the first adsorber 11 and hot water flows through the second adsorber 12, and first adsorption. It is a flow path switching valve that switches to a second heat medium flow path that allows warm water to flow through the vessel 11 and cooling water to flow through the second adsorber 12. Each of the four-way valves 71 and 72 of the present embodiment is configured by an electric switching valve, and its operation is controlled in accordance with a control signal from the control device 100 described later.

  When the control signal for switching the heat medium flow path to the first heat medium flow path is input from the control device 100, the four-way valves 71 and 72 connect the second cooling pipe 51 to the first adsorber 11, and 2 Switch to the flow path connecting the hot water pipe 62 to the adsorber 12.

  Thereby, as shown in FIG. 1, the cooling water flows into the first adsorber 11 through the second cooling pipe 51, and the hot water flows into the second adsorber 12 through the hot water pipe 62. At this time, in the first adsorber 11, the adsorbent 11a is cooled by the cooling water, so that the gas-phase refrigerant evaporated in the evaporator 14 is adsorbed by the adsorbent 11a (adsorption mode). On the other hand, in the second adsorber 12, the adsorbent 12a is heated by hot water, whereby the refrigerant adsorbed on the adsorbent 12a is desorbed (desorption mode).

  Further, each of the four-way valves 71 and 72 connects the hot water pipe 62 to the first adsorber 11 when the control signal for switching the heat medium flow path to the second heat medium flow path is input from the control device 100. Switch to the flow path connecting the second cooling pipe 51 to the two adsorber 12.

  Thereby, as shown in FIG. 2, hot water flows into the first adsorber 11 through the hot water pipe 62, and cooling water flows into the second adsorber 12 through the second cooling pipe 51. At this time, in the first adsorber 11, the adsorbent 11a is heated by hot water, whereby the refrigerant adsorbed on the adsorbent 11a is desorbed (desorption mode). On the other hand, in the second adsorber 12, the adsorbent 12a is cooled by cooling water, so that the gas-phase refrigerant evaporated in the evaporator 14 is adsorbed by the adsorbent 12a (adsorption mode).

  As described above, the mode switching unit 70 of the present embodiment can switch the desorption mode and the adsorption mode alternately for each of the adsorbers 11 and 12 by switching the heat medium flow path using the four-way valves 71 and 72. It has become. That is, the mode switching unit 70 uses the four-way valves 71 and 72 to set the first adsorber 11 in the adsorption mode and the second adsorber 12 in the desorption mode, and the first adsorber 11 in the desorption mode. The second operation mode in which the second adsorber 12 is set to the adsorption mode can be switched alternately.

  Next, the refrigerant storage tank 80 will be described. The refrigerant storage tank 80 is a tank for storing the refrigerant in the refrigeration cycle 10. The refrigerant storage tank 80 is formed with a refrigerant storage space 81 capable of storing a liquid-phase refrigerant on the bottom side thereof. The refrigerant storage space 81 has an internal volume capable of storing a predetermined amount of refrigerant. The refrigerant storage tank 80 according to the present embodiment is disposed below the direction of gravity with respect to the devices constituting the refrigeration cycle 10. Thereby, the refrigerant in the refrigeration cycle 10 can be collected in the refrigerant storage tank 80 by utilizing the head difference between the refrigerant storage tank 80 and the components of the refrigeration cycle 10.

  In the refrigerant storage tank 80, an electric heater 82 is disposed in the refrigerant storage space 81. The electric heater 82 is a heating device that heats the refrigerant present in the refrigerant storage space 81. The electric heater 82 is provided to heat the liquid-phase refrigerant stored in the refrigerant storage tank 80 and increase the pressure in the refrigerant storage tank 80 at the start of operation of the refrigeration cycle 10. When the pressure in the refrigerant storage tank 80 rises due to the heating of the electric heater 82, the refrigerant in the refrigerant storage tank 80 flows to the evaporator 14 side where the pressure is lower than in the refrigerant storage tank 80. The operation of the electric heater 82 is controlled in accordance with a control signal from the control device 100 described later.

  The refrigerant storage tank 80 is connected to a first communication pipe 83 that communicates with a reflux pipe 15 e that connects the condenser 13 and the evaporator 14. The first communication pipe 83 is provided to recover the refrigerant in the refrigeration cycle 10 to the refrigerant storage tank 80 via the reflux pipe 15e when the operation of the refrigeration cycle 10 is stopped. The first communication pipe 83 is connected to the bottom side of the refrigerant storage tank 80 so that liquid refrigerant existing inside the condenser 13 and the evaporator 14 flows into the refrigerant storage tank 80 by its own weight. The first communication pipe 83 also functions as a pipe for filling the refrigerant in the refrigerant storage tank 80 into the refrigeration cycle 10 via the reflux pipe 15e when the operation of the refrigeration cycle 10 is started.

  The refrigerant storage tank 80 is connected to a second communication pipe 84 that communicates with the evaporator 14. The second communication pipe 84 is a pressure equalization passage provided to equalize the refrigerant storage tank 80 and the evaporator 14 when the operation of the refrigeration cycle 10 is stopped. The second communication pipe 84 is connected to the upper side in the evaporator 14 and the upper side of the refrigerant storage tank 80 so that the refrigerant in the evaporator 14 does not flow into the refrigerant storage tank 80.

  Next, the connection switching unit 90 will be described. The connection switching unit 90 switches between a permissible state that allows the refrigerant in the refrigeration cycle 10 to be stored in the refrigerant storage tank 80 and a prohibition state that prohibits the storage of the refrigerant in the refrigeration cycle 10 in the refrigerant storage tank 80. It is. The connection switching unit 90 according to the present embodiment includes a first on-off valve 91 disposed on the first communication pipe 83 and a second on-off valve 92 disposed on the second communication pipe 84.

  The first on-off valve 91 is an electromagnetic valve that opens and closes the first communication pipe 83. When the first on-off valve 91 is in the open state, the refrigerant storage tank 80 and the reflux pipe 15e communicate with each other through the first communication pipe 83. Further, when the first on-off valve 91 is in the closed state, the communication state between the refrigerant storage tank 80 and the return pipe 15e via the first communication pipe 83 is blocked.

  The second on-off valve 92 of the present embodiment is a normally closed (normally closed) solenoid valve that is opened by power supply. The operation of the second on-off valve 92 is controlled in accordance with a control signal from the control device 100 described later.

  The second on-off valve 92 is an electromagnetic valve that opens and closes the second communication pipe 84. When the second on-off valve 92 is in the open state, the refrigerant storage tank 80 and the evaporator 14 communicate with each other via the second communication pipe 84. Further, when the second on-off valve 92 is in the closed state, the communication state between the refrigerant storage tank 80 and the evaporator 14 through the second communication pipe 84 is blocked.

  The refrigerant storage tank 80, the electric heater 82, the communication pipes 83 and 84, and the connection switching unit 90 of the present embodiment are filled with the refrigerant in the refrigerant storage tank 80 into the refrigeration cycle 10 and the refrigerant in the refrigeration cycle 10. A refrigerant charging / recovering device that performs recovery to the refrigerant storage tank 80 is configured.

  Next, the control apparatus 100 which comprises the electronic control part of the refrigerating system of this embodiment is demonstrated. The control device 100 includes a microcomputer including a CPU (memory device) such as a ROM and a RAM, and peripheral circuits thereof. The control device 100 performs various calculations and processes based on the control program stored in the memory, and controls the operation of various control devices connected to the output side. Note that the control device 100 has a built-in timer circuit for measuring time.

  On the input side of the control device 100, as a sensor group for control, a condenser temperature sensor 101, a hot water temperature sensor, a cooling water temperature sensor, a heat exchange fluid temperature sensor, an indoor temperature sensor, an outdoor temperature sensor, a liquid level sensor, etc. Is connected.

  The condenser temperature sensor 101 is a temperature sensor that detects the temperature of the refrigerant in the condenser 13. The liquid level sensor is a sensor that detects the liquid level in the refrigerant storage tank 80. The condenser temperature sensor 101 employs not only a temperature sensor that directly detects the temperature of the refrigerant in the condenser 13 but also a temperature sensor that indirectly detects the temperature of the refrigerant in the condenser 13. Also good.

  An operation panel on which various operation switches are arranged is connected to the input side of the control device 100. The control device 100 receives control signals output from various operation switches on the operation panel. The operation panel is provided with a refrigeration system operation switch, a temperature setting switch for setting the room temperature, and the like as various operation switches.

  The control device 100 according to the present embodiment is a device in which control units (hardware and software) that control operations of various control devices connected to the output side are integrated. Examples of the control unit integrated in the control device 100 include an air conditioning control unit 100a, a filling control unit 100b, and a recovery control unit 100c. The air-conditioning control unit 100a is a control unit that performs an air-conditioning operation process that exhibits the refrigeration capacity of the refrigeration cycle 10 to air-condition the room. The charging control unit 100b is a control unit that performs a refrigerant charging process for charging the refrigerant in the refrigerant storage tank 80 into the refrigeration cycle 10. The recovery control unit 100c is a control unit that executes a refrigerant recovery process for recovering the refrigerant in the refrigeration cycle 10 to the refrigerant storage tank 80.

  Next, the basic operation of the refrigeration system having the above configuration will be described with reference to the flowchart shown in FIG. The control process shown in FIG. 3 is executed by the control device 100. When the operation switch on the operation panel is turned on, the control device 100 executes the control process shown in FIG.

  As shown in FIG. 3, when the operation switch on the operation panel is turned on, the control device 100 executes a refrigerant charging process (S1). The control device 100 according to the present embodiment continues the refrigerant charging process until a predetermined reference charging time (for example, 15 minutes) elapses after the operation switch is turned on.

  The reference charging time is set to a measurement value obtained by measuring the time required for charging the refrigerant in the refrigeration cycle 10 in advance by experiments or simulations. The reference filling time is stored in advance in the memory as a determination parameter.

  The control device 100 of the present embodiment energizes the first on-off valve 91 to open the valve in a state where the energization of the second on-off valve 92 is turned off (closed state) during the refrigerant filling process. Thereby, the refrigerant in the refrigerant storage tank 80 can be charged into the refrigeration cycle 10 by the communication between the refrigerant storage tank 80 and the reflux pipe 15 e of the refrigeration cycle 10.

  In addition, the control device 100 turns on the electric heater 82 to heat the refrigerant in the refrigerant storage tank 80. Thereby, the pressure in the refrigerant | coolant storage tank 80 rises.

  Further, the control device 100 operates the fluid pump 33, the cooling water pump 42, and the hot water pump 63, and each of the adsorbers 11 and 12 so that the desorption mode and the adsorption mode are alternately switched at a predetermined cycle. The four-way valves 71 and 72 are controlled. That is, the control device 100 includes a first operation mode (see FIG. 1) in which the first adsorber 11 is in the adsorption mode and the second adsorber 12 in the desorption mode, the first adsorber 11 in the desorption mode, and the second The four-way valves 71 and 72 are controlled so that the second operation mode (see FIG. 2) in which the adsorber 12 is in the adsorption mode is alternately repeated.

  By such control, in each of the adsorbers 11, 12, one adsorber is cooled with cooling water and the refrigerant is adsorbed on the adsorbent, and the other adsorber is heated with hot water and adsorbed on the adsorbent. Is detached.

  Thereby, the pressure in the evaporator 14 connected to the 2nd adsorption device used as adsorption mode among each adsorption device 11 and 12 falls. In the evaporator 14, the heat exchange target fluid is cooled by evaporating the refrigerant by heat exchange between the heat exchange fluid that is the cooling target fluid and the refrigerant.

  In addition, among the adsorbers 11 and 12, the desorbed refrigerant desorbed from the adsorbent of the first adsorber that is in the desorption mode is exchanged by the condenser 13 with the cooling water that is the first cooling medium. It is condensed and stored in the condenser 13. Then, the refrigerant stored in the condenser 13 flows into the evaporator 14 through the reflux pipe 15e.

  At this time, the pressure in the refrigerant storage tank 80 is increased by heating the refrigerant by the electric heater 82. And since the 2nd on-off valve 92 is a valve closing state, it becomes higher than the pressure in the evaporator 14.

  Thereby, the refrigerant in the refrigerant storage tank 80 is filled in the refrigeration cycle 10 by the refrigerant in the refrigerant storage tank 80 flowing into the evaporator 14 via the recirculation pipe 15e. At the start of operation, since the pressure in the condenser 13 hardly exceeds the pressure in the refrigerant storage tank 80, the refrigerant in the condenser 13 hardly flows into the refrigerant storage tank 80.

  When a predetermined reference filling time (for example, 15 minutes) elapses after the operation switch is turned on, the control device 100 controls each control device and shifts from the refrigerant filling process (S1) to the air conditioning operation process (S2). .

  At the start of the air-conditioning operation process, the control device 100 turns off the electric heater 82 and turns off the power to the first on-off valve 91 so that the on-off valves 91 and 92 are closed. Thereby, the communication between the refrigerant storage tank 80 and the refrigeration cycle 10 is blocked.

  Moreover, the control apparatus 100 operates the air blower 31a, the fluid pump 33, the cooling water pump 42, and the hot water pump 63. Further, the control device 100 performs a first operation mode in which the first adsorber 11 is in the adsorption mode and the second adsorber 12 is in the desorption mode, the first adsorber 11 is in the desorption mode, and the second adsorber 12 is adsorbed. The four-way valves 71 and 72 are controlled so that the second operation mode to be switched to the mode is alternately repeated.

  Switching between the first operation mode and the second operation mode is performed at a preset cycle. This period is shorter than the time required for adsorbing the adsorbable amount of refrigerant that can be held by the adsorbents 11a and 12a of the adsorbers 11 and 12, and when the allowable adsorbent amount of refrigerant is adsorbed to the adsorbent. The cycle is set shorter than the time required to desorb all the refrigerant. The same applies to the refrigerant filling process described above and the refrigerant recovery process described later.

  In the first operation mode, as shown in FIG. 1, the first adsorber 11 is cooled with cooling water, and the refrigerant is adsorbed to the adsorbent 11 a of the first adsorber 11. At this time, the pressure in the first adsorber 11 is less than the pressure on the evaporator 14 side and less than the pressure on the condenser 13 side. Therefore, the first evaporation side check valve 16a is opened, and the first condensation side check valve 16b is closed.

  As the first evaporation side check valve 16a opens, the pressure in the evaporator 14 decreases. And in the evaporator 14, a heat exchange fluid is cooled because a refrigerant | coolant evaporates by heat exchange with the heat exchange fluid which is a cooling object fluid, and a refrigerant | coolant.

  Thereby, in the indoor heat exchanger 31, the blown air blown from the blower 31a and the heat exchange fluid cooled by the evaporator 14 exchange heat, the blown air is cooled, and the cooled blown air enters the room. Blown out.

  In the first operation mode, as shown in FIG. 1, the second adsorber 12 is heated with warm water, and the refrigerant is desorbed from the adsorbent 12 a of the second adsorber 12. At this time, the pressure in the second adsorber 12 becomes equal to or higher than the pressure on the evaporator 14 side and equal to or higher than the pressure on the condenser 13 side. For this reason, the second evaporation side check valve 16c is closed, and the second condensation side check valve 16d is opened.

  With the opening of the second condensing side check valve 16d, the desorbed refrigerant desorbed from the adsorbent 12a of the second adsorber 12 flows into the condenser 13, and the condenser 13 serves as the first cooling medium. It is condensed by heat exchange with and stored in the condenser 13. Thereafter, the refrigerant stored in the condenser 13 flows into the evaporator 14 through the reflux pipe 15e.

  On the other hand, in the second operation mode, as shown in FIG. 2, the second adsorber 12 is cooled with cooling water, and the refrigerant is adsorbed to the adsorbent 12 a of the second adsorber 12. At this time, the pressure in the second adsorber 12 is less than the pressure on the evaporator 14 side and less than the pressure on the condenser 13 side. Therefore, the second evaporation side check valve 16c is opened, and the second condensation side check valve 16d is closed.

  As the second evaporation side check valve 16c is opened, the pressure in the evaporator 14 decreases. In the evaporator 14, the heat exchange target fluid is cooled by evaporating the refrigerant by heat exchange between the heat exchange fluid that is the cooling target fluid and the refrigerant.

  Thereby, in the indoor heat exchanger 31, the blown air blown from the blower 31a and the heat exchange fluid cooled by the evaporator 14 exchange heat, the blown air is cooled, and the cooled blown air enters the room. Blown out.

  In the second operation mode, as shown in FIG. 2, the first adsorber 11 is heated with warm water, and the refrigerant is desorbed from the adsorbent 11 a of the first adsorber 11. At this time, the pressure in the first adsorber 11 becomes equal to or higher than the pressure on the evaporator 14 side and equal to or higher than the pressure on the condenser 13 side. For this reason, the first evaporation side check valve 16a is closed, and the first condensation side check valve 16b is opened.

  With the opening of the first condensation side check valve 16b, the desorbed refrigerant desorbed from the adsorbent 11a of the first adsorber 11 flows into the condenser 13, and the condenser 13 serves as the first cooling medium. It is condensed by heat exchange with and stored in the condenser 13. Thereafter, the refrigerant stored in the condenser 13 flows into the evaporator 14 through the reflux pipe 15e.

  As described above, in the air conditioning control process, each control device is controlled so that the control device 100 alternately repeats the first operation mode and the second operation mode, thereby realizing continuous cooling in the room. .

  Subsequently, the control device 100 determines whether or not to stop the operation of the refrigeration system according to the on / off state of the operation switch (S3). The control device 100 continues the air conditioning operation process when the control signal for turning off the operation switch is not input. On the other hand, when a control signal for turning off the operation switch is input, the control device 100 determines that the operation is stopped, and controls each control device to shift from the air conditioning operation process (S2) to the refrigerant recovery process (S4). .

  The refrigerant recovery process is a process of desorbing the refrigerant adsorbed by both the adsorbents 11 a and 12 a of the adsorbers 11 and 12 and collecting the desorbed refrigerant in the refrigerant storage tank 80.

  Here, as a method of desorbing the refrigerant adsorbed by each of the adsorbers 11 and 12, it is conceivable to stop the supply of cooling water to the adsorber in the adsorption mode among the adsorbers 11 and 12. .

  However, when the cooling water to the adsorber that is in the adsorption mode is stopped, the temperature difference between the hot water and each adsorber 11, 12 is reduced by eliminating the opportunity to cool each adsorber 11, 12. The amount of heat transfer to the adsorbers 11 and 12 (heat radiation heat amount) decreases. For this reason, if a situation occurs in which the temperature of the heat source that generates hot water continues to rise, the temperature of the hot water rises excessively, causing boiling of the hot water and excessive pressure in the circuit through which the hot water circulates. There is a concern that Such a situation is not preferable because it adversely affects the performance and safety of the refrigeration system.

  Therefore, in the refrigerant recovery process of the present embodiment, the temperature rise of the hot water supplied to each of the adsorbers 11 and 12 when recovering the refrigerant to the refrigerant storage tank 80 is suppressed. The refrigerant recovery process of this embodiment will be described with reference to the flowchart of FIG. 4, the overall configuration diagram of the refrigeration system of FIG. 5, and the timing chart of FIG. 6.

  As shown in FIG. 4, the control device 100 first executes a collection setting process for setting the operating states of the on-off valves 91 and 92 that constitute the connection switching unit 90 (S40). Specifically, the control device 100 energizes both the on-off valves 91 and 92 to open the on-off valves 91 and 92, respectively. That is, the control device 100 switches to a permissible state in which the refrigerant in the refrigeration cycle 10 is allowed to be stored in the refrigerant storage tank 80 by the connection switching unit 90.

  Thus, the refrigerant storage tank 80 and the reflux pipe 15e communicate with each other via the first communication pipe 83, and the refrigerant storage tank 80 and the evaporator 14 communicate with each other via the second communication pipe 84. At this time, the refrigerant storage tank 80 has an internal pressure equal to the pressure in the evaporator 14. For this reason, the refrigerant in the condenser 13 and the refrigerant in the evaporator 14 flow into the refrigerant storage tank 80 as indicated by arrows in the vicinity of the reflux pipe 15e in FIG.

  Then, the control apparatus 100 performs the pump operation process which sets the operation state of the air blower 31a, the fluid pump 33, the cooling water pump 42, and the hot water pump 63 (S41). Specifically, the control device 100 stops the operation of the blower 31a and the fluid pump 33 while continuing the operation of the cooling water pump 42 and the hot water pump 63.

  Thereby, in the first adsorber in the desorption mode among the adsorbers 11 and 12, the adsorbent is heated by the hot water, so that the refrigerant adsorbed by the adsorbent is desorbed. Then, the refrigerant desorbed from the adsorbent of the first adsorber is condensed by heat exchange with the cooling water that is the first cooling medium in the condenser 13 and stored in the condenser 13. Then, the refrigerant stored in the condenser 13 is collected in the refrigerant storage tank 80 via the reflux pipe 15e and the first communication pipe 83.

  On the other hand, among the adsorbers 11 and 12, the adsorbent is cooled by the cooling water in the second adsorber that is in the adsorption mode. At this time, since the heat exchange fluid does not flow into the evaporator 14, the refrigerant hardly evaporates. For this reason, since the refrigerant | coolant which can adsorb | suck with an adsorbent decreases around the 2nd adsorber used as adsorption mode, the adsorbent of a 2nd adsorber hardly adsorb | sucks a refrigerant | coolant. The liquid-phase refrigerant in the evaporator 14 is collected in the refrigerant storage tank 80 via the reflux pipe 15e and the first communication pipe 83.

  Subsequently, the control device 100 determines whether or not it is a switching timing (mode switching timing) between the first operation mode and the second operation mode (S42). In this determination process, determination is made based on a control cycle for switching a preset operation mode.

  The control device 100 executes a mode switching process for switching the operation mode when the mode switching timing comes (S43), and skips the mode switching process when it is not the mode switching timing.

  In the mode switching process, when the current operation mode is the first operation mode, the four-way valves 71 and 72 are controlled so as to switch to the second operation mode as shown in the timing chart of FIG.

  In the mode switching process, when the current operation mode is the second operation mode, the four-way valves 71 and 72 are controlled to switch to the first operation mode as shown in the timing chart of FIG.

  Subsequently, the control device 100 determines whether or not the desorption of the adsorbents 11a and 12a of the respective adsorbers 11 and 12 is completed (S44). Specifically, the control device 100 determines whether or not an elapsed time after starting the refrigerant recovery process has passed a preset reference desorption time. In addition, as the reference desorption time, a time that is a multiple of the operation mode switching period (for example, a period corresponding to four periods) is set. The reference desorption time is stored in advance in the memory as a determination parameter.

  When the desorption of the adsorbents 11a and 12a of the adsorbers 11 and 12 is not completed, the control device 100 returns to step S42 and continues desorption of the adsorbents 11a and 12a of the adsorbers 11 and 12. To do.

  When the desorption of the adsorbents 11a and 12a of the adsorbers 11 and 12 is completed, the control device 100 executes a pump stop process for stopping the operation of the cooling water pump 42 and the hot water pump 63 (S45). Thereby, the supply of hot water and cooling water to each of the adsorbers 11 and 12 is stopped, and the supply of cooling water to the condenser 13 is also stopped.

  Subsequently, the control device 100 determines whether or not the reference collection time has elapsed since the pump stop process was executed (S46). The reference recovery time is set to a measurement value obtained by measuring the time required for recovering the refrigerant in the condenser 13 or the refrigerant in the evaporator 14 in the refrigerant storage tank 80 in advance through experiments or simulations. The reference recovery time is stored in advance in the memory as a determination parameter.

  The control device 100 continues to collect the refrigerant from the condenser 13 and the evaporator 14 into the refrigerant storage tank 80 when the reference collection time has not elapsed. After the pump stop process, the refrigerant in the refrigeration cycle 10 is recovered in the refrigerant storage tank 80 using the head difference between the refrigerant storage tank 80 and the condenser 13 and the evaporator 14.

  In addition, when the reference recovery time has elapsed, the control device 100 executes a recovery cancellation process (S47) and ends the refrigerant recovery process. This collection cancellation process is a process for turning off the energization of the on-off valves 91 and 92 and closing the on-off valves 91 and 92, respectively.

  In the refrigeration system of the present embodiment described above, the operation of the fluid pump 33 is stopped while the operation of the cooling water pump 42 and the hot water pump 63 is continued when the refrigerant in the refrigeration cycle 10 is recovered. Executes the process of repeating the mode alternately.

  According to this, in the first adsorber that is in the desorption mode among the adsorbers 11 and 12, the adsorbent absorbs heat from the hot water, so that the desorption of the refrigerant in the adsorbent is promoted. In the condenser 13, the desorbed refrigerant is condensed by heat exchange between the desorbed refrigerant from which the adsorbent of the first adsorber is desorbed and the cooling water (first cooling medium). At this time, since the refrigerant in the refrigeration cycle 10 is allowed to be stored in the refrigerant storage tank 80, the refrigerant in the refrigeration cycle 10 can be recovered in the refrigerant storage tank 80.

  In addition, since the supply of the heat exchange fluid, which is the fluid to be cooled, is stopped to the evaporator 14, the amount of heat absorbed in the evaporator 14 decreases, so that the refrigerant hardly evaporates in the evaporator 14. For this reason, even if the cooling water (second cooling medium) is supplied to the second adsorber that is in the adsorption mode, the adsorbent of the second adsorber hardly adsorbs the refrigerant.

  Thus, in the refrigeration system of the present embodiment, when the operation of the refrigeration cycle 10 is stopped, the refrigerant adsorbed by each of the adsorbers 11 and 12 can be desorbed and collected in the refrigerant storage tank 80. For this reason, it can suppress that dew condensation generate | occur | produces in each component apparatus which comprises the refrigerating cycle 10 after the driving | operation stop of the refrigerating cycle 10.

  In particular, the refrigeration system of the present embodiment is configured to supply cooling water (second cooling medium) to the second adsorber that is in the adsorption mode when the refrigerant is collected in the refrigerant storage tank 80. For this reason, each adsorption device 11 and 12 can be sufficiently cooled by the cooling water (second cooling medium) in the adsorption mode. For this reason, even if the adsorption mode and the desorption mode are alternately switched, it is possible to prevent the hot water supplied to each of the adsorbers 11 and 12 from being excessively heated.

  As a result, when collecting the refrigerant in the refrigerant storage tank 80, boiling of hot water and excessive increase in pressure in the circuit through which the hot water circulates can be suppressed, and sufficient performance and safety in the refrigeration system can be secured. It becomes possible to do.

  Further, the refrigeration system of the present embodiment employs a configuration in which the cooling water pump 42 functions as a common supply pump for the cooling medium supply units 40 and 50. According to this, the system component apparatus of a refrigeration system can be simplified. As a result, it is possible to reduce the size and cost of the refrigeration system.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. In the present embodiment, the components of the first and second cooling medium supply units 40 and 50 and the operation of each pump in the refrigerant recovery process are different from those in the first embodiment. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  As shown in FIG. 7, in the refrigeration system of the present embodiment, each of the cooling medium supply units 40 and 50 individually has a supply pump. In other words, in the refrigeration system of the present embodiment, the first cooling water pump 43 is provided as the first supply pump in the first cooling pipe 41 of the first cooling medium supply unit 40, and the second cooling of the second cooling medium supply unit 50 is performed. The piping 51 is provided with a second cooling water pump 52 as a second supply pump. In addition, each cooling water pump 43 and 52 of this embodiment is comprised by the flow volume variable type pump which can change rotation speed (discharge flow volume) according to the control signal from the control apparatus 100 mentioned later.

  The cooling water pumps 43 and 52 of the present embodiment have the same basic configuration as the cooling water pump 42 of the first embodiment, and can be individually controlled in accordance with a control signal from the control device 100. In addition, each cooling piping 41 and 51 may merge in the upstream of each cooling water pump 43 and 52, and may each be comprised by independent piping.

  Here, the control device 100 operates both the cooling water pumps 43 and 52 to cool the condenser 13 and the second adsorber that is in the adsorption mode when the refrigerant filling process and the air conditioning operation process are performed. Water (first cooling medium, second cooling medium) is supplied. Since the other configurations and the contents of the refrigerant charging process and the air conditioning operation process are the same as those in the first embodiment, the description thereof is omitted.

  Next, the refrigerant recovery process of the present embodiment will be described using the timing chart of FIG. As shown in FIG. 8, in the refrigerant recovery process of the present embodiment, at the start of the refrigerant recovery process, the control device 100 continues the operation of each of the cooling water pumps 43 and 52 and the hot water pump 63 while operating the fluid pump 33. Stop. In addition, the control device 100 controls the four-way valves 71 and 72 so that the desorption mode and the adsorption mode of the adsorbers 11 and 12 are alternately switched at a predetermined cycle.

  Here, in the refrigerant recovery process, the amount of cooling water required for the condenser 13 and the amount of cooling water required for the second adsorber in the adsorption mode among the adsorbers 11 and 12. Is different.

  Explaining this point, the condenser 13 requires an amount of cooling water required for condensing the refrigerant during the refrigerant recovery process. On the other hand, in the second adsorber that is in the adsorption mode, the temperature increase of the hot water supplied to each of the adsorbers 11 and 12 is not the original purpose of adsorbing the refrigerant to the adsorbent during the refrigerant recovery process. The amount of cooling water required to suppress the pressure is required.

  Therefore, the control device 100 according to the present embodiment uses the first cooling water pump 43 to supply the cooling water (first cooling medium) to the condenser 13 and the second cooling water pump 52 when performing the refrigerant recovery process. The supply amount of the cooling water (second cooling medium) to the second adsorber in the adsorption mode is individually adjusted.

  Here, in the refrigerant recovery process, the refrigerant condensed in the condenser 13 flows into the refrigerant storage tank 80 via the reflux pipe 15e and the first communication pipe 83, and the amount of refrigerant recovered in the refrigerant storage tank 80 gradually increases. To increase. Thereby, in a refrigerant | coolant collection process, the quantity of the refrigerant | coolant condensed with the condenser 13 reduces gradually, and the temperature of the condenser 13 falls.

  In view of this point, as illustrated in the timing chart of FIG. 8, the control device 100 according to the present embodiment includes a condenser as time elapses from the start of the refrigerant recovery process when the refrigerant recovery process is executed. The operation of the first cooling water pump 43 is controlled so that the supply amount of the cooling water to 13 is reduced.

  Moreover, the control apparatus 100 of this embodiment controls the action | operation of the 2nd cooling water pump 52 as the refrigerant | coolant collection by a refrigerant | coolant collection process advances at the time of execution of a refrigerant | coolant collection process.

  Here, at the start of the refrigerant recovery process, it is necessary to supply cooling water to the second adsorber that is in the adsorption mode to suppress the temperature rise of the adsorbers 11 and 12. However, after the switching of the last operation mode in the refrigerant recovery process is completed, even if the cooling water is reduced to the second adsorber, the temperature of the hot water does not increase excessively.

  In view of this point, as illustrated in the timing chart of FIG. 8, the control device 100 of the present embodiment performs the operation of the second cooling water pump 52 after completing the switching of the last operation mode in the refrigerant recovery process. The supply of cooling water (second cooling medium) to the adsorber that is in the adsorption mode is stopped.

  Other control processes are the same as those in the first embodiment. Therefore, also in the configuration of the present embodiment, as in the first embodiment, the refrigerant in the refrigeration cycle 10 is recovered in the refrigerant storage tank 80, and excessive warm water supplied to each of the adsorbers 11 and 12 at the time of refrigerant recovery is excessive. It becomes possible to suppress the temperature rise.

  In particular, in the refrigeration system of the present embodiment, the first and second cooling water pumps 43 and 52 are provided in the cooling medium supply units 40 and 50, respectively, and the amount of cooling water supplied to the condenser 13 when the refrigerant recovery process is performed. And the amount of cooling water supplied to the second adsorber that is in the adsorption mode can be individually adjusted.

  According to this, at the time of execution of a refrigerant | coolant collection process, each quantity of each cooling water required by each apparatus can be supplied with respect to the condenser 13 and the 2nd adsorption device used as adsorption mode. As a result, it is possible to improve the refrigerant recovery efficiency in the refrigerant recovery process.

  Specifically, in the refrigeration system of the present embodiment, the amount of cooling water (first cooling medium) supplied to the condenser 13 decreases as time elapses from the start of the refrigerant recovery process. The operation of the first cooling water pump 43 is controlled.

  According to this, the energy consumption accompanying the action | operation of the 1st cooling water pump 43 at the time of a refrigerant | coolant collection process can be reduced, and an efficient refrigerant | coolant collection process can be implement | achieved. In addition, although this embodiment demonstrated the example which controls the action | operation of the 1st cooling water pump 43 as time passes after starting a refrigerant | coolant collection process, it is not limited to this. For example, the operation of the first cooling water pump 43 may be controlled according to the temperature detected by the condenser temperature sensor 101. In this case, the control device 100 decreases the supply amount of the cooling water to the condenser 13 as the detected temperature of the condenser temperature sensor 101 decreases, and the cooling water to the condenser 13 as the detected temperature increases. The operation of the first cooling water pump 43 may be controlled so that the supply amount increases.

  Further, in the refrigeration system of the present embodiment, as the refrigerant recovery by the refrigerant recovery process proceeds, the second cooling water pump 52 so that the amount of cooling water supplied to the second adsorber in the adsorption mode decreases. Is controlling the operation.

  According to this, energy consumption accompanying the operation of the second cooling water pump 52 during the refrigerant recovery process can be reduced, and an efficient refrigerant recovery process can be realized. Furthermore, it is possible to prevent the refrigerant from adsorbing to the adsorbent of the second adsorber that is in the adsorption mode at the end of the refrigerant recovery process, and to improve the refrigerant recovery efficiency.

  In addition, although this embodiment demonstrated the example which controls the action | operation of the 2nd cooling water pump 52 according to the progress of the refrigerant | coolant collection by a refrigerant | coolant collection process, it is not limited to this. For example, the operation of the second cooling water pump 52 may be controlled according to the temperature detected by the hot water temperature sensor during the refrigerant recovery process. In this case, the amount of cooling water supplied to each of the adsorbers 11 and 12 decreases as the temperature detected by the hot water temperature sensor decreases, and the amount of cooling water supplied to each of the adsorbers 11 and 12 increases as the detected temperature increases. What is necessary is just to control the action | operation of the 2nd cooling water pump 52 so that quantity may increase. According to this, it becomes possible to suppress efficiently the excessive temperature rise of the warm water supplied to each adsorption device 11 and 12 at the time of refrigerant | coolant collection | recovery.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, In the range described in the claim, it can change suitably. For example, various modifications are possible as follows.

  (1) In each of the above-described embodiments, the example in which the refrigeration cycle 10 having two adsorbers such as the first and second adsorbers 11 and 12 is employed has been described. You may employ | adopt the refrigerating cycle 10 which has a container.

  (2) In each of the above-described embodiments, the example in which the heat exchange fluid heat-exchanged with the refrigerant in the evaporator 14 is used for indoor cooling, but the cooling water heat-exchanged with the refrigerant in the condenser 13 is used in the room. You may utilize as heat sources, such as heating and a hot-water supply apparatus.

  (3) In each of the above-described embodiments, the refrigerant filling process executed by the control device 100 has been described as an example where the reference filling time has elapsed from the start of the operation, but the control process end condition is not limited thereto. For example, the end condition of the control process may be that the liquid level in the refrigerant storage tank 80 measured by the liquid level sensor is lowered to a predetermined value or less.

  (4) In each of the above-described embodiments, the refrigerant recovery process executed by the control device 100 has been described as an example in which the reference recovery time has elapsed from the pump stop process, but the control process end condition is not limited thereto. For example, the end condition of the control process may be that the liquid level in the refrigerant storage tank 80 measured by the liquid level sensor has risen to a predetermined value or more.

  (5) In each of the above-described embodiments, the example in which the refrigerant in the refrigerant storage tank 80 is heated by the electric heater 82 during the refrigerant filling process has been described. However, the present invention is not limited to this. May be heated.

  (6) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say.

  (7) In each of the above-described embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, the specific number is clearly specified when clearly indicated as essential. It is not limited to the specific number except when limited to.

  (8) In each of the above-described embodiments, when referring to the shape, positional relationship, etc. of the component, etc., unless specifically stated or limited in principle to a specific shape, positional relationship, etc. It is not limited to shape, positional relationship, and the like.

DESCRIPTION OF SYMBOLS 10 Refrigerating cycle 11, 12 1st, 2nd adsorption machine 13 Condenser 14 Evaporator 15 Refrigerant circulation path 30 Cooling object fluid supply part 40 1st cooling medium supply part 50 2nd cooling medium supply part 60 Heating medium supply part 70 Mode Switching unit 80 Refrigerant storage tank 90 Connection switching unit 100c Recovery control unit

Claims (3)

By exchanging heat between the refrigerant and the fluid to be cooled and evaporating the refrigerant, an evaporator (14) that cools the fluid to be cooled and an adsorbent that adsorbs and desorbs the refrigerant evaporated in the evaporator are accommodated. A plurality of adsorbers (11, 12), a condenser (13) for condensing the desorbed refrigerant by exchanging heat between the desorbed refrigerant from which the adsorbent is desorbed and the first cooling medium, An adsorption refrigeration cycle (10) having a refrigerant circulation path (15) for circulating the refrigerant by connecting the plurality of adsorbers and the evaporator;
A first cooling medium supply unit (40) for supplying the first cooling medium to the condenser;
A cooling target fluid supply unit (30) for supplying the cooling target fluid to the evaporator;
A mode switching unit (70) capable of alternately switching between a desorption mode for desorbing the refrigerant adsorbed on the adsorbent and an adsorption mode for adsorbing the refrigerant on the adsorbent;
A heating medium supply unit (60) for circulatingly supplying a heating medium for heating the adsorbent to the first adsorber in the desorption mode among the plurality of adsorbers;
A second cooling medium supply unit (50) for supplying a second cooling medium for cooling the adsorbent to the second adsorber in the adsorption mode among the plurality of adsorbers;
A refrigerant storage tank (80) for storing refrigerant in the refrigeration cycle;
A connection switching unit (90) for switching between a permissible state in which the refrigerant in the refrigeration cycle is allowed to be stored in the refrigerant storage tank and a prohibited state in which the refrigerant in the refrigeration cycle is prohibited from being stored in the refrigerant storage tank. When,
When stopping the operation of the refrigeration cycle, the mode switching unit, the heating medium supply unit, the first cooling medium supply unit, the second cooling medium supply unit, the cooling target fluid supply unit, and the connection switching unit And a recovery control unit (100c) that executes a refrigerant recovery process for recovering the refrigerant in the refrigeration cycle to the refrigerant storage tank.
The recovery control unit is switched to the permissible state by the connection switching unit when executing the refrigerant recovery process, and the heating medium supply unit, the first cooling medium supply unit, and the second cooling medium supply unit The desorption mode and the adsorption mode are alternately switched by the mode switching unit for the plurality of adsorbers in a state where the operation of the cooling target fluid supply unit is stopped while operating the cooling unit. system. The first cooling medium supply unit and the second cooling medium supply unit have a common supply pump (42),
The refrigeration system according to claim 1, wherein the supply pump supplies the first cooling medium and the second cooling medium as a common cooling medium to both the condenser and the second adsorber. . The first cooling medium supply unit has a first supply pump (43) for supplying the first cooling medium to the condenser;
The second cooling medium supply unit has a second supply pump (52) for supplying the second cooling medium to the second adsorber,
The recovery control unit includes an amount of the first cooling medium supplied to the condenser by the first supply pump (43) during the execution of the refrigerant recovery process, and the second supply by the second supply pump (52). The refrigeration system according to claim 1, wherein the second cooling medium supply amount to the adsorber is individually adjusted.

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