Refrigeration equipment and method for recovering adsorbent from refrigeration equipment

Abstract

The adsorbent material is collected. [Solution] The refrigeration device (100) comprises a circuit (101) and a control unit (105). The circuit (101) includes a flow path (111) through which refrigerant and adsorbent material circulate. The adsorbent material adsorbs and desorbs refrigerant in response to changes in the pressure of the refrigerant. The control unit (105) controls the circuit (101). The circuit (101) includes a compressor (131), a first heat recovery unit (133), a second heat recovery unit (134), and containers (136-139). The first heat recovery unit (133) recovers the heat generated when the adsorbent material adsorbs the refrigerant. The second heat recovery unit (134) recovers the cold energy generated when the adsorbent material desorbs the refrigerant. The container (137) recovers the adsorbent. The control unit (105) controls the circuit (101) to execute a recovery mode. The recovery mode recovers the adsorbent in the flow path (111) into a container (137).

Description

Technical Field

[0001] The present invention relates to a refrigeration device and a method for recovering an adsorbent from the refrigeration device.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1 (U.S. Patent Application Publication No. 2023 / 0417459), a refrigeration device having an adsorption refrigeration cycle that utilizes heat generated when a refrigerant is adsorbed and desorbed with respect to an adsorbent containing a metal-organic framework has been used. As such a refrigeration device, a circulation type refrigeration device having a refrigerant flow path through which a mixture of a refrigerant and an adsorbent circulates is known.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The inventor focused on the fact that in a circulation type refrigeration device, it may be necessary to recover the adsorbent from the mixture of the refrigerant and the adsorbent.

Means for Solving the Problems

[0004] The refrigeration device according to the first aspect includes a circuit and a control unit. The circuit includes a flow path. In the flow path, a refrigerant and an adsorbent circulate. The adsorbent adsorbs and desorbs the refrigerant in response to a change in the pressure of the refrigerant. The control unit controls the circuit. The circuit includes a compressor, a first heat recovery unit, a second heat recovery unit, and a container. The compressor compresses the refrigerant. In the first heat recovery unit, the heat generated when the adsorbent adsorbs the refrigerant is recovered. In the second heat recovery unit, the cold heat generated when the adsorbent desorbs the refrigerant is recovered. The container is where the adsorbent is recovered. The control unit controls the circuit to execute a recovery mode. In the recovery mode, the adsorbent in the flow path is recovered into the container.

[0005] According to the refrigeration device of the first aspect, since the control unit controls the circuit to execute the recovery mode, the adsorbent can be recovered from the flow path in which the mixture of the refrigerant and the adsorbent circulates into the container.

[0006] A refrigeration apparatus according to the second aspect is a refrigeration apparatus according to the first aspect, wherein the container has a first outlet from which an adsorbent material flows out. The circuit further includes a first valve for adjusting the flow rate of the adsorbent material flowing out from the first outlet.

[0007] In the second type of refrigeration apparatus, when the first valve is closed, the adsorbent can be stored in the container, and when the first valve is opened, the adsorbent in the container can be discharged from the first outlet.

[0008] A refrigeration apparatus according to the third aspect is a refrigeration apparatus according to the first or second aspect, wherein the container further includes an inlet and a second outlet. A mixture of refrigerant and adsorbent flows into the inlet. The refrigerant flows out through the second outlet.

[0009] In the third type of refrigeration apparatus, by closing the first valve, the refrigerant from the mixture that flows into the container from the inlet is discharged from the second outlet, making it easy to recover the adsorbent in the container.

[0010] The refrigeration system of the fourth perspective is a refrigeration system of any of the first, second, or third perspectives, wherein the control unit controls the circuit to further execute the normal operation mode. In the normal operation mode, thermal energy is recovered in the first heat recovery unit and cold energy is recovered in the second heat recovery unit. The container is placed in the flow path through which the refrigerant and adsorbent circulate in the normal operation mode.

[0011] In the fourth aspect of the refrigeration system, the container used in the normal operation mode can also be used in the recovery mode.

[0012] The refrigeration system of the fifth perspective is a refrigeration system of any of the first to fourth perspectives, wherein the control unit controls the circuit to further perform a normal operating mode. In the normal operating mode, thermal energy is recovered in the first heat recovery unit and cold energy is recovered in the second heat recovery unit. The container is located outside the flow path through which the refrigerant and adsorbent circulate in the normal operating mode.

[0013] As with the refrigeration system described in the fifth point, containers not used in normal operation mode may be used in recovery mode.

[0014] The refrigeration apparatus of the sixth aspect is a refrigeration apparatus of any of the first to fifth aspects, wherein the container further has an inlet and a second outlet. A mixture of refrigerant and adsorbent flows into the inlet. The refrigerant flows out through the second outlet. The circuit further includes a second valve and a third valve. The second valve adjusts the flow rate of the mixture flowing in from the inlet. The third valve adjusts the flow rate of the refrigerant flowing out from the second outlet.

[0015] In the refrigeration system described in the sixth perspective, the flow rate of the mixture flowing into the container can be adjusted by the second valve, and the amount of refrigerant flowing out of the container can be adjusted by the third valve, so that the adsorbent can be easily recovered in the container.

[0016] The refrigeration device of the seventh aspect is a refrigeration device of the second aspect, the third aspect, the fourth aspect relating to the second aspect, the fifth aspect relating to the second aspect, or the sixth aspect, wherein the control unit closes the first valve when the recovery mode is being executed.

[0017] In the seventh aspect of the refrigeration device, the adsorbent can be easily recovered into the container by closing the first valve during recovery mode.

[0018] The refrigeration apparatus of the eighth aspect is the refrigeration apparatus of the seventh aspect, wherein the control unit increases the rotational speed of the compressor after closing the first valve.

[0019] In the refrigeration system described in the eighth perspective, the time required for the recovery mode can be shortened by increasing the rotational speed of the compressor after closing the first valve.

[0020] The refrigeration system of the ninth perspective is the refrigeration system of the eighth perspective, and the control unit stops the compressor when the recovery mode is terminated.

[0021] In the ninth aspect of the refrigeration system, the operation of the refrigeration system is stopped when the recovery mode is completed, allowing for maintenance and other tasks to be performed.

[0022] The refrigeration device according to the 10th aspect is any one of the refrigeration devices according to the 1st to 9th aspects, and the adsorbent contains a metal-organic framework containing metal ions and organic ligands.

[0023] Like the refrigeration device according to the 10th aspect, the metal-organic framework is suitably used as an adsorbent for adsorbing and desorbing a refrigerant.

[0024] The refrigeration device according to the 11th aspect is any one of the refrigeration devices according to the 1st to 9th aspects, and the refrigerant contains at least one of carbon dioxide, hydrocarbon, ammonia, water, hydrofluorocarbon (HFC), and hydrofluoroolefin (HFO).

[0025] Like the refrigeration device according to the 11th aspect, a refrigerant containing at least one of carbon dioxide, hydrocarbon, ammonia, water, HFC, and HFO is suitably used as a refrigerant for an adsorption refrigeration cycle device.

[0026] A method for recovering an adsorbent from a refrigeration device according to the 12th aspect is a method for recovering an adsorbent from a refrigeration device, including a flow path, a compressor, a first heat recovery section, a second heat recovery section, and a container. The flow path circulates a refrigerant and an adsorbent that adsorbs and desorbs the refrigerant according to a change in the pressure of the refrigerant. The compressor compresses the refrigerant. The first heat recovery section recovers the heat generated when the adsorbent adsorbs the refrigerant. The second heat recovery section recovers the cold heat generated when the adsorbent desorbs the refrigerant. The container recovers the adsorbent. The method for recovering an adsorbent from a refrigeration device includes a step of recovering the adsorbent in the flow path into the container.

[0027] According to the method for recovering an adsorbent from a refrigeration device according to the 12th aspect, by performing the recovery step, the adsorbent can be recovered from the flow path in which the mixture of the refrigerant and the adsorbent circulates into the container. In this way, the adsorbent can be recovered from the refrigeration device.

[0028] The method for recovering an adsorbent from a refrigeration device according to the 13th aspect is the method for recovering an adsorbent from a refrigeration device according to the 12th aspect, further including a step of discharging the refrigerant from the flow path after the recovery step.

[0029] In the method for recovering the adsorbent from the refrigeration device according to the 13th aspect, since the refrigerant is discharged from the flow path, maintenance of the refrigeration device and the like can be easily performed.

[0030] The method for recovering the adsorbent from the refrigeration device according to the 14th aspect is the method for recovering the adsorbent from the refrigeration device according to the 13th aspect, and further includes a step of removing the container after the discharging step.

[0031] In the method for recovering the adsorbent from the refrigeration device according to the 14th aspect, since the container in which the adsorbent has been recovered is removed, replacement of the adsorbent and the like can be easily performed.

[0032] The method for recovering the adsorbent from the refrigeration device according to the 15th aspect is the method for recovering the adsorbent from the refrigeration device according to the 14th aspect, and further includes a step of attaching a second container after the removing step.

[0033] In the method for recovering the adsorbent from the refrigeration device according to the 15th aspect, the container can be replaced.

[0034] The method for recovering the adsorbent from the refrigeration device according to the 16th aspect is the method for recovering the adsorbent from the refrigeration device according to the 12th or 13th aspect, and further includes a step of taking out the adsorbent from the container.

[0035] In the method for recovering the adsorbent from the refrigeration device according to the 16th aspect, the adsorbent can be taken out while the container is placed.

[0036] The method for recovering the adsorbent from the refrigeration device according to the 17th aspect is the method for recovering the adsorbent from the refrigeration device according to the 16th aspect, and further includes a step of filling the container with the adsorbent.

[0037] In the method for recovering the adsorbent from the refrigeration device according to the 17th aspect, the container can be filled with the adsorbent while the container is placed.

Brief Description of the Drawings

[0038] [Figure 1]This is a conceptual diagram of a refrigeration system equipped with a refrigeration cycle. [Figure 2] This graph shows the relationship between the amount of adsorption by the adsorbent and the pressure of the refrigerant. [Figure 3] This graph shows the relationship between the amount of adsorption by the adsorbent and the enthalpy of the refrigerant. [Figure 4] This is a schematic diagram of the refrigeration device according to the first embodiment. [Figure 5] This is a block diagram of the refrigeration system according to the first embodiment. [Figure 6] This is a schematic diagram of the vicinity of the container in the first embodiment. [Figure 7] This is a schematic diagram of the first state in the normal operating mode of the refrigeration system. [Figure 8] This is a schematic diagram of the second state in the normal operating mode of the refrigeration system. [Figure 9] This is a schematic diagram of a refrigeration apparatus as a modified example of the first embodiment. [Figure 10] This is a flowchart showing a method for recovering adsorbent material from a refrigeration device according to the first embodiment. [Figure 11] This is a schematic diagram of the refrigeration device according to the second embodiment. [Figure 12] This is a schematic diagram of the refrigeration system according to the third embodiment. [Figure 13] This is a schematic diagram of the vicinity of the container in the third embodiment. [Figure 14] This is a schematic diagram of a refrigeration apparatus according to a modified example 2 of the third embodiment. [Figure 15] This is a schematic diagram of a refrigeration device according to a modified example 3 of the third embodiment. [Figure 16] These are schematic diagrams of the vicinity of the container in modified examples of the first to third embodiments. [Figure 17] This flowchart shows a method for recovering adsorbent material from a refrigeration device according to a modified example of the first to third embodiments. [Figure 18] This is a schematic diagram of a refrigeration apparatus of a modified example of the second embodiment. [Modes for carrying out the invention]

[0039] (1) Overview of the refrigeration cycle The refrigeration system of this embodiment includes a refrigeration cycle that utilizes the heat generated when the adsorbent adsorbs a refrigerant and when the adsorbent desorbs a refrigerant. The refrigeration system is, for example, an air conditioning system. The adsorbent is a powder of an adsorbent material.

[0040] The refrigeration system of this embodiment is a circulating type refrigeration system in which an adsorbent material circulates. As shown in Figure 1, the circulating type refrigeration system 1 comprises a refrigerant circuit 11 through which a refrigerant circulates, and an adsorption circuit 12 through which an adsorbent material circulates. In Figure 1, the refrigerant circuit 11 and the adsorption circuit 12 are described as separate circuits. The refrigeration system 1 may also have a configuration in which the refrigerant circuit 11 and the adsorption circuit 12 merge into a flow path. In this case, the refrigeration system 1 is part of the refrigerant circuit 11 and the adsorption circuit 12 and has a flow path through which a mixture of refrigerant and adsorbent material flows. Alternatively, the refrigeration system 1 may have only one circuit through which a mixture of refrigerant and adsorbent material circulates.

[0041] The refrigeration device 1 has an adsorption section 21 and a desorption section 22. Both the adsorption section 21 and the desorption section 22 include a part of the refrigerant circuit 11 and a part of the adsorption circuit 12. In the adsorption section 21, the refrigerant from the refrigerant circuit 11 is adsorbed onto the adsorbent material flowing through the adsorption circuit 12. In the desorption section 22, the refrigerant adsorbed in the adsorption section 21 is desorbed from the adsorbent material flowing through the adsorption circuit 12.

[0042] The refrigerant circuit 11 includes a compressor 31 and an expansion mechanism 32. The compressor 31 compresses the refrigerant circulating within the refrigerant circuit 11. The expansion mechanism 32 reduces the pressure of the refrigerant circulating within the refrigerant circuit 11. The compressor 31 is, for example, a rotary compressor. The expansion mechanism 32 is, for example, an electronic expansion valve. In the refrigerant circuit 11, the refrigerant is compressed by the compressor 31, passes through the adsorption section 21, reduced in pressure by the expansion mechanism 32, passes through the desorption section 22, and is compressed again by the compressor 31.

[0043] The refrigerant circuit 11 has a high-pressure region and a low-pressure region. In the high-pressure region, the refrigerant flows after being compressed by the compressor 31 and before being depressurized by the expansion mechanism 32. In the low-pressure region, the refrigerant flows after being depressurized by the expansion mechanism 32 and before being compressed by the compressor 31. The high-pressure region is included in the adsorption section 21. The low-pressure region is included in the desorption section 22.

[0044] The refrigerant circulating within the refrigerant circuit 11 includes at least one of carbon dioxide, hydrocarbons, ammonia, water, HFCs (hydrofluorocarbons), and HFOs (hydrofluoroolefins). The hydrocarbons are selected from the group consisting of, for example, propane, butane, and isobutane.

[0045] The adsorption circuit 12 includes a booster 41 and a pressure reducer 42. The booster 41 transports the adsorbent material to the adsorption section 21 in the adsorption circuit 12. The pressure reducer 42 transports the adsorbent material to the attachment / detachment section 22 in the adsorption circuit 12. The booster 41 is, for example, a powder pump. The pressure reducer 42 is, for example, a powder valve. In the adsorption circuit 12, the adsorbent material passes through the adsorption section 21 via the booster 41 and through the attachment / detachment section 22 via the pressure reducer 42. The adsorption circuit 12 may further include a heat exchanger 43. The heat exchanger 43 performs heat exchange between the upstream side of the booster 41 and the upstream side of the depressurizer 42. The heat exchanger 43 transfers a portion of the heat from the adsorbent flowing between the adsorption section 21 and the depressurizer 42 to the adsorbent flowing between the desorption section 22 and the booster 41.

[0046] The adsorbent circulating in the adsorption circuit 12 includes a metal-organic framework containing metal ions and organic ligands. A metal-organic framework (MOF) is a porous material with a very large specific surface area obtained by the reaction of metal ions and organic ligands. In a metal-organic framework, the organic ligands link with the metal ions to obtain a polymeric structure with countless openings inside. The opening diameter and topology of the metal-organic framework can be adjusted by selecting and combining metal ions and organic ligands. By selecting and combining metal ions and organic ligands, the opening diameter of the metal-organic framework can be adjusted, enabling selective adsorption of target substances. For example, metal-organic frameworks are used as porous materials that have the function of selective storage and separation of molecules and ions. In this embodiment, the metal-organic framework is used as an adsorbent for adsorbing and desorbing a refrigerant. Examples of metal-organic frameworks include MOF-5, MOF-200, UiO-66, and MIL-101. The adsorbent is, for example, a powder of a metal-organic structure.

[0047] (2) Operation of refrigeration unit 1 The operation of the circulating refrigeration system 1 will be explained with reference to the drawings. The adsorbent adsorbs and desorbs the refrigerant circulating in the refrigerant circuit 11. The adsorbent adsorbs and desorbs the refrigerant in response to changes in the pressure of the refrigerant circulating in the refrigerant circuit 11. Specifically, the adsorbent adsorbs the refrigerant under high pressure and desorbs the refrigerant under low pressure.

[0048] Assume that the high-pressure region of the refrigerant circuit 11 is filled with refrigerant at pressure pH and temperature TH. Assume that the low-pressure region of the refrigerant circuit 11 is filled with refrigerant at pressure pL and temperature TL. Pressure pH is higher than pressure pL. Temperature TH is higher than temperature TL. The adsorbent adsorbs refrigerant in the high-pressure region of the refrigerant circuit 11. The adsorbent desorbs refrigerant in the low-pressure region of the refrigerant circuit 11. In the adsorption section 21, the refrigerant flowing in the high-pressure region of the refrigerant circuit 11 is adsorbed onto the adsorbent of the adsorption circuit 12. In the desorption section 22, the refrigerant is desorbed from the adsorbent flowing through the adsorption circuit 12.

[0049] The operation of the heat pump cycle of refrigeration system 1 will be explained with reference to Figures 1 to 3. Figures 1 to 3 show the refrigerant cycle a→b→c→d→a in the refrigerant circuit 11, and the adsorbent cycle a'→b'→c'→d'→a' in the adsorption circuit 12. The graph in Figure 2 shows the adsorption amount, which is the mass of refrigerant adsorbed on the adsorbent per unit mass, and the change in the pressure of the refrigerant adsorbed on the adsorbent, in the heat pump cycle. The graph in Figure 3 shows the adsorption amount of the adsorbent and the change in the enthalpy of the refrigerant adsorbed on the adsorbent, in the heat pump cycle. In refrigeration system 1, it is assumed that heat can flow freely between the refrigerant circuit 11 and the adsorption circuit 12.

[0050] In the refrigerant circuit 11, the refrigerant is compressed by the compressor 31 (a→b). In the adsorption circuit 12, the adsorbent is circulated using the booster 41 (a'→b'). As a result, the pressure of the refrigerant increases from pL to pH. During this process, some of the heat Q1 generated by the adiabatic compression of the refrigerant is transferred to the adsorbent. In other words, the refrigerant is cooled by transferring heat to the adsorbent while being compressed. As a result, the temperature of the adsorbent rises from TL to TH.

[0051] Next, in the adsorption section 21, the refrigerant is gradually adsorbed onto the adsorbent while releasing heat Q2 (b'→c'). During this process, the amount of adsorption on the adsorbent increases from mL to mH. As a result, in the adsorption section 21, the refrigerant from the refrigerant circuit 11 is adsorbed onto the adsorbent of the adsorption circuit 12. In Figure 1, as indicated by the hatched arrows within the adsorption section 21, the refrigerant from the refrigerant circuit 11 is adsorbed onto the adsorbent circulating in the adsorption circuit 12.

[0052] Next, in the refrigerant circuit 11, the refrigerant is depressurized by the expansion mechanism 32 (c→d). In the adsorption circuit 12, the adsorbent is circulated by the pressure reducer 42. As a result, the refrigerant pressure decreases from pH to pL. During this process, the temperature of the adsorbent decreases from TH to TL due to the isenthalpic expansion of the refrigerant desorbed from the adsorbent. Also, due to the temperature difference between the refrigerant and the adsorbent, the adsorbent in the adsorption circuit 12 is cooled, transferring heat Q3 to the refrigerant in the refrigerant circuit 11. Furthermore, heat Q5 is transferred from the adsorbent before it passes through the pressure reducer 42 to the adsorbent before it passes through the pressure booster 41 by the heat exchanger 43.

[0053] Next, in the desorption section 22, the refrigerant is gradually desorbed from the adsorbent while absorbing heat Q4 (d'→a'). During this process, the amount of adsorbed material decreases from mH to mL. As a result, the refrigerant adsorbed on the adsorbent in the adsorption circuit 12 is desorbed. In Figure 1, as indicated by the hatched arrows within the desorption section 22, the refrigerant is desorbed from the adsorbent in the adsorption circuit 12 in the desorption section 22.

[0054] As shown in Figure 2, during the adsorption process (b'→c') in which the refrigerant is adsorbed onto the adsorbent, the pressure of the refrigerant is pH, and the amount of adsorbed by the adsorbent increases from mL to mH. During the desorption process (d'→a') in which the refrigerant is desorbed from the adsorbent, the pressure of the refrigerant is pL, and the amount of adsorbed by the adsorbent decreases from mH to mL. As shown in Figure 3, during the adsorption process, the enthalpy decreases by Δh1. During the desorption process, the enthalpy increases by Δh2. During the adsorption process, the heat Q2 released from the adsorption part 21 is proportional to Δh1. During the desorption process, the heat Q4 absorbed by the desorption part 22 is proportional to Δh2.

[0055] In the refrigeration device 1, heat Q2 is released in the adsorption section 21 (first heat recovery section), generating warmth, and heat Q4 is absorbed in the desorption section 22 (second heat recovery section), generating cold energy. When the warmth generated in the adsorption section 21 is recovered by another heat transfer medium, the temperature of that heat transfer medium rises. When the cold energy generated in the desorption section 22 is recovered by another heat transfer medium, the temperature of that heat transfer medium decreases.

[0056] (3) Detailed configuration (3-1) First Embodiment The specific configuration of the circulating refrigeration system 100 will be explained with reference to the drawings.

[0057] (3-1-1) Overall configuration of the refrigeration unit 100 The refrigeration system 100 of the first embodiment includes a circuit 101 shown in Figure 4 and a control unit 105 shown in Figure 5. When the refrigeration system 100 is an air conditioning system, the circuit 101 is the heat source side circuit with respect to the air. In this case, the refrigeration system 100 includes an outdoor unit 102 and an indoor unit 103.

[0058] As shown in Figure 4, the circuit 101 includes a flow path 111 through which the refrigerant circulates. The flow path 111 has the functions of both the refrigerant circuit 11 and the adsorption circuit 12 in Figure 1. The adsorbent circulates in the flow path 111 together with the refrigerant. In other words, in the refrigeration system 100, a mixture of refrigerant and adsorbent flows through the flow path 111.

[0059] In Figure 4, the flow path 111 has a first flow path 111a through which the mixture flows, a second flow path 111b through which only the refrigerant flows, and a third flow path 111c through which only the adsorbent flows. The second flow path 111b and the third flow path 111c merge at the confluence 111d.

[0060] Circuit 101 also includes a compressor 131, a booster 141, a pressure reducing unit 132, a first heat recovery unit 133, a second heat recovery unit 134, switching mechanisms 135 and 138, containers 136 and 137, first valves 146 and 147, an accumulator 143, and shut-off valves 144 and 145. Flow path 111 connects the compressor 131, the pressure reducing unit 132, the first heat recovery unit 133, the second heat recovery unit 134, switching mechanisms 135 and 138, containers 136 and 137, a booster 141, an accumulator 143, shut-off valves 144 and 145, and first valves 146 and 147.

[0061] Compressor 131 has the same function as compressor 31 in Figure 1. Compressor 131 is a transport mechanism that transports refrigerant within the flow path 111. Here, compressor 131 is located in the second flow path 111b.

[0062] The booster 141 has the same function as the booster 41 in Figure 1. The booster 141 is a transport mechanism that transports the adsorbent material within the flow path 111. Here, the booster 141 is located in the third flow path 111c.

[0063] The pressure reducing section 132 has the function of the expansion mechanism 32 shown in Figure 1. The pressure reducing section 132 has the function of creating a pressure difference in the flow path 111. The pressure reducing section 132 is, for example, a control valve with a variable opening degree, an expander with a variable rotation speed, a capillary tube, etc., and in this case it is an electric valve.

[0064] The switching mechanism 135 switches the flow direction of the mixture circulating in the flow path 111. The switching mechanism 135 is, for example, a four-way switching valve. The switching mechanism 135 is configured to switch the flow path 111 between a first state with a flow direction shown by the solid line in Figure 4 and a second state with a flow direction shown by the dashed line in Figure 4. When the flow path 111 is in the first state, the discharge side of the compressor 131 is connected to the first heat recovery unit 133, and the suction side of the compressor 131 is connected to the second heat recovery unit 134. When the flow path 111 is in the second state, the discharge side of the compressor 131 is connected to the second heat recovery unit 134, and the suction side of the compressor 131 is connected to the first heat recovery unit 133.

[0065] In the first heat recovery unit 133, the refrigerant is adsorbed onto the adsorbent while the flow path 111 is in the first state, and the refrigerant is desorbed from the adsorbent while the flow path 111 is in the second state. In the second heat recovery unit 134, the refrigerant is desorbed from the adsorbent while the flow path 111 is in the first state, and the refrigerant is adsorbed onto the adsorbent while the flow path 111 is in the second state.

[0066] While the flow path 111 is in the first state, adsorption heat (warmth) is generated in the first heat recovery unit 133, and desorption heat (coldness) is generated in the second heat recovery unit 134. While the flow path 111 is in the second state, desorption heat is generated in the first heat recovery unit 133, and adsorption heat is generated in the second heat recovery unit 134. Adsorption heat is the warmth generated when the adsorbent adsorbs the refrigerant. Desorption heat is the coldness generated when the adsorbent desorbs the refrigerant.

[0067] The heat of adsorption or desorption generated in the first heat recovery unit 133 and the second heat recovery unit 134 is recovered into the air surrounding the first heat recovery unit 133 and the second heat recovery unit 134. Therefore, the air surrounding the first heat recovery unit 133 and the second heat recovery unit 134 is heated by the heat of adsorption or cooled by the heat of desorption.

[0068] In the refrigeration system 100, as the mixture circulates through the flow path 111, air heated by adsorption heat or cooled by desorption heat is sent to a predetermined location. If the refrigeration system 100 is an air conditioning system, for example, the first heat recovery unit 133 corresponds to an outdoor heat exchanger, and the second heat recovery unit 134 corresponds to an indoor heat exchanger. In this case, by switching the flow path 111 to the first state, the refrigerant is desorbed from the adsorbent in the second heat recovery unit 134, generating desorption heat. The air cooled by the desorption heat is sent to a predetermined location by a fan or the like. Also, by switching the flow path 111 to the second state, the refrigerant is adsorbed by the adsorbent in the second heat recovery unit 134, generating adsorption heat. The air heated by the adsorption heat is sent to a predetermined location by a fan or the like.

[0069] The accumulator 143 temporarily stores the refrigerant that is drawn into the compressor 131. The accumulator 143 is located on the suction side of the compressor 131.

[0070] The shut-off valves 144 and 145 are manually operated valves. The shut-off valves 144 and 145 are used when discharging refrigerant from the flow path 111.

[0071] Here, shut-off valves 144 and 145 are three-way valves having service ports 144a and 145a. Shut-off valve 144 is provided in the flow path 111 connecting the container 137 and the second heat recovery unit 134. Shut-off valve 145 is provided in the flow path 111 connecting the second heat recovery unit 134 and the container 136.

[0072] Service ports 144a and 145a are used to introduce refrigerant into the flow path 111, or to discharge or recover refrigerant from the flow path 111. Service ports 144a and 145a are also used to evacuate at least a portion of the flow path 111 or to introduce gas (e.g., an inert gas such as nitrogen). The position and structure of the shut-off valves 144 and 145 are not particularly limited, as long as they are available for these applications. The refrigeration system 100 may also be equipped with only one shut-off valve that has the same function as the two shut-off valves 144 and 145.

[0073] Containers 136 and 137 separate the mixture into a refrigerant and an adsorbent. Container 136 is positioned between the first heat recovery unit 133 and the pressure reduction unit 132. Container 137 is positioned between the second heat recovery unit 134 and the compressor 131.

[0074] Furthermore, containers 136 and 137 recover the adsorbent. In other words, containers 136 and 137 have the function of separating the adsorbent and refrigerant from the mixture, and the function of recovering the adsorbent in the flow path 111. Containers 136 and 137 will be described later.

[0075] The first valves 146 and 147 regulate the flow rate of the adsorbent separated in containers 136 and 137. The first valves 146 and 147 are located in the third flow path 111c. The first valves 146 and 147 are, for example, solenoid valves, motorized valves, etc., and in this case, motorized valves.

[0076] The switching mechanism 138 switches the flow direction of the mixture to allow the mixture to flow into the container 136. The switching mechanism 138 is, for example, a four-way switching valve. The switching mechanism 138 is configured to switch the flow path 111 between a first state with a flow direction shown by the solid line in Figure 4 and a second state with a flow direction shown by the dashed line in Figure 4.

[0077] The refrigeration system 100 further includes a control unit 105 as shown in Figure 5. The control unit 105 controls the operation of each component of the refrigeration system 100. Here, a processor is given as an example of the control unit 105. The processor consists of various computing devices such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field-Programmable Gate Array), and a GPU (Graphics Processing Unit). The processor reads various programs of the device into memory and executes them. The processor loads the programs stored in memory into the working area of ​​the memory and executes them, and by controlling each component through the execution of the programs, it realizes functions that match a predetermined purpose.

[0078] As shown in Figure 5, the control unit 105 controls the compressor 131, the pressure reducing unit 132, the switching mechanism 135, the booster 141, and the first valves 146 and 147. The control unit 105 controls the rotational speed of the compressor 131. The control unit 105 controls the timing for starting the compressor 131 and the timing for stopping the compressor 131. The control unit 105 controls the opening degree of the pressure reducing unit 132. The control unit 105 controls the switching mechanisms 135 and 138 to switch the flow path 111 between the first state and the second state. The control unit 105 controls the rotational speed of the booster 141. The control unit 105 controls the timing for starting the booster 141 and the timing for stopping the booster 141. The control unit 105 adjusts the opening degrees of the first valves 146 and 147.

[0079] The control unit 105 controls the circuit 101 to perform recovery mode and normal operation mode.

[0080] The recovery mode recovers the adsorbent in the flow path 111 into at least one of the containers 136 or 137. Here, the recovery mode recovers the adsorbent in the flow path 111 into one of the containers 136 or 137. The recovery mode is performed when performing maintenance on the refrigeration system 100. Maintenance includes, for example, replacing the adsorbent, adding or replacing the refrigerant, or replacing components that make up the circuit 101.

[0081] In normal operation mode, when the flow path 111 is in the first state, the first heat recovery unit 133 recovers thermal energy and the second heat recovery unit 134 recovers cold energy. Here, since the flow path 111 can be switched between the first and second states, when the flow path 111 is in the second state, in normal operation mode, the first heat recovery unit 133 recovers cold energy and the second heat recovery unit 134 recovers thermal energy.

[0082] The trial run mode performs a trial run of the refrigeration unit 100. The trial run mode is used for experimental operation before the normal operation mode is performed.

[0083] The control unit 105 may also execute other modes. Examples of other modes include a test run mode for performing a trial run and a defrost mode for performing a defrost operation.

[0084] (3-1-2) Detailed configuration of the refrigeration unit 100 In this embodiment, containers 136 and 137 are placed in the flow path 111 through which the refrigerant and adsorbent circulate in normal operation mode. In this configuration, the adsorbent cannot flow through functional components such as the pressure reduction unit 132 and the compressor 131. Therefore, containers 136 and 137 are placed in the flow path 111 such that the adsorbent circulating through the flow path 111 bypasses the compressor 131 and the functional components.

[0085] When the first heat recovery unit 133 recovers thermal energy and the second heat recovery unit 134 recovers cold energy, the containers 136 and 137 separate from the mixture into refrigerant and adsorbent. When the first heat recovery unit 133 recovers cold energy and the second heat recovery unit 134 recovers thermal energy, the containers 136 and 137 separate from the mixture into refrigerant and adsorbent.

[0086] Containers 136 and 137 have, for example, a mechanism for centrifuging the adsorbent by swirling the mixture inside. The adsorbent separates from the refrigerant by rotating against the inner walls of containers 136 and 137 and moving downward due to gravity. As a result, the adsorbent separated in containers 136 and 137 falls downward due to gravity, while the separated refrigerant moves upward.

[0087] As shown in Figure 6, the containers 136 and 137 have inlets 136a and 137a, first outlets 136c and 137c, and second outlets 136b and 137b.

[0088] The mixture flows into inlets 136a and 137a. Inlets 136a and 137a are connected to the first channel 111a.

[0089] The first outlets 136c and 137c are through which the adsorbent flows out. The first outlets 136c and 137c are connected to the third channel 111c. Here, the adsorbent flows out from the first outlets 136c and 137c into the third channel 111c. The first outlets 136c and 137c are located below (here, below in the vertical direction) the containers 136 and 137.

[0090] The refrigerant flows out through the second outlets 136b and 137b. The second outlets 136b and 137b are connected to the second flow path 111b. Here, the refrigerant flows out from the second outlets 136b and 137b into the second flow path 111b. The second outlets 136b and 137b are located above the containers 136 and 137 (here, above in the vertical direction). It is preferable that the second outlets 136b and 137b are oriented upwards from the horizontal direction, but if they are located above the containers 136 and 137, they may be located on the side surface as well as the top surface.

[0091] The first valves 146 and 147 regulate the flow rate of the adsorbent material flowing out from the first outlets 136c and 137c. The first valves 146 and 147 are located in the third flow path 111c, which communicates with the first outlets 136c and 137c. The first valves 146 and 147 are positioned near the first outlets 136c and 137c.

[0092] The following explanation will use the case where the adsorbent in the flow path 111 is recovered into the container 137 during the execution of the recovery mode as an example.

[0093] When the recovery mode is executed, the control unit 105 closes the first valve 147, which adjusts the flow rate of adsorbent material flowing out of the first outlet 137c of the container 137 that recovers the adsorbent material in the flow path 111. Note that "closing the first valve 147" means reducing the opening degree of the first valve 147, and includes cases where it is fully closed and cases where it is not fully closed. However, from the viewpoint of shortening the time for recovering the adsorbent material, it is preferable for the control unit 105 to fully close the first valve 147 when the recovery mode is executed.

[0094] When the recovery mode is running, the refrigerant flows out from the second outlet 137b. As a result, when the recovery mode is running, the adsorbent falls due to gravity and accumulates in the hatched area at the bottom in Figure 6.

[0095] Furthermore, after closing the first valve 147, the control unit 105 increases the rotational speed of the compressor 131. Here, the control unit 105 also increases the rotational speed of the booster 141. "Increasing the rotational speed" means that it is greater than the rotational speed in normal operation mode. As a result, when the recovery mode is executed, the refrigerant and adsorbent flow through the flow path 111.

[0096] Furthermore, when the recovery mode ends, the control unit 105 stops the compressor 131. In this case, when the recovery mode ends, the control unit 105 stops the operation of both the compressor 131 and the booster 141.

[0097] The container 137 is configured to be removable from the flow path 111. Therefore, the refrigeration device 100 may further include a mechanism that allows the container 137 to be attached to and removed from the flow path 111. Examples of such mechanisms include a mechanism that allows the removal of brazed joints and a swage.

[0098] (3-1-3) Operation of the refrigeration unit 100 (3-1-3-1) Normal operation mode The normal operating mode is implemented by the control unit 105 controlling the circuit 101 to perform two operations: one in which the first heat recovery unit 133 recovers thermal energy and the second heat recovery unit 134 recovers cold energy, and another in which the first heat recovery unit 133 recovers cold energy and the second heat recovery unit 134 recovers thermal energy.

[0099] (3-1-3-1-1) First state As shown in Figure 7, when the flow path 111 is in the first state, the discharge side of the compressor 131 is connected to the first heat recovery unit 133 to create a high-pressure state inside the first heat recovery unit 133, and the suction side of the compressor 131 is connected to the second heat recovery unit 134 to create a low-pressure state inside the second heat recovery unit 134. Therefore, the adsorbent flowing through the flow path 111 adsorbs the refrigerant in the first heat recovery unit 133 and desorbs the refrigerant in the second heat recovery unit 134.

[0100] When the flow path 111 is in the first state, the mixture that has passed through the second heat recovery unit 134 passes through the shut-off valve 145 and the switching mechanism 138 and flows into the container 136, where it is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 flows from the second outlet 136b into the second flow path 111b and is drawn into the compressor 131 through the accumulator 143. The refrigerant compressed in the compressor 131 flows into the confluence section 111d. Meanwhile, the adsorbent separated in the container 136 flows from the first outlet 136c into the third flow path 111c and is drawn into the booster 141 through the first valve 146. The adsorbent pressurized in the booster 141 flows into the confluence section 111d.

[0101] At the confluence section 111d, the refrigerant and adsorbent are mixed to form a mixture, which flows into the first heat recovery section 133 through the first flow path 111a and the switching mechanism 135. The mixture, which has undergone heat exchange with air in the first heat recovery section 133, flows into the container 137 through the switching mechanism 138. The refrigerant separated in the container 137 flows into the second flow path 111b from the second outlet 136b and flows to the confluence section 111d through the depressurization section 132. Meanwhile, the adsorbent separated in the container 137 flows into the third flow path 111c from the first outlet 137c and flows to the confluence section 111d.

[0102] At the confluence section 111d, the refrigerant and adsorbent are mixed to form a mixture, which flows into the second heat recovery section 134 through the first flow path 111a and the shut-off valve 144. In the second heat recovery section 134, heat exchange takes place with air, so in the first state, the refrigeration system 100 operates in cooling mode.

[0103] (3-1-3-1-2) Second state As shown in Figure 8, when the flow path 111 is in the second state, the discharge side of the compressor 131 is connected to the second heat recovery unit 134 to create a high-pressure state inside the second heat recovery unit 134, and the suction side of the compressor 131 is connected to the first heat recovery unit 133 to create a low-pressure state inside the first heat recovery unit 133. Therefore, the adsorbent flowing through the flow path 111 adsorbs the refrigerant in the second heat recovery unit 134 and desorbs the refrigerant in the first heat recovery unit 133.

[0104] When the flow path 111 is in the second state, the mixture that has passed through the first heat recovery unit 133 flows into the container 136 through the switching mechanism 135 and is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 flows into the second flow path 111b from the second outlet 136b and is drawn into the compressor 131 through the accumulator 143. The refrigerant compressed in the compressor 131 flows into the confluence section 111d. Meanwhile, the adsorbent separated in the container 136 flows into the third flow path 111c from the first outlet 136c and is drawn into the booster 141. The adsorbent pressurized in the booster 141 flows into the confluence section 111d.

[0105] At the confluence section 111d, the refrigerant and adsorbent are mixed to form a mixture, which flows into the second heat recovery section 134 through the first flow path 111a, the switching mechanism 135, and the shut-off valve 145. In the second heat recovery section 134, heat exchange with air takes place, so when the flow path 111 is in the second state, the refrigeration system 100 operates in heating mode. The mixture that has undergone heat exchange with air in the second heat recovery section 134 flows into the container 137 through the shut-off valve 144 and the switching mechanism 138. The refrigerant separated in the container 137 flows from the second outlet 136b into the second flow path 111b and flows to the confluence section 111d through the depressurization section 132. Meanwhile, the adsorbent separated in the container 137 flows from the first outlet 137c into the third flow path 111c and flows to the confluence section 111d.

[0106] At the confluence section 111d, the refrigerant and adsorbent are mixed to form a mixture, which flows into the first heat recovery section 133 through the first flow path 111a and the switching mechanism 138. In the first heat recovery section 133, heat exchange takes place with the air.

[0107] (3-1-3-2) Recovery Mode The recovery mode is implemented by the control unit 105 controlling the circuit 101 to perform an operation in which the adsorbent in the flow path 111 is recovered into at least one of the containers 136 and 137. The recovery mode in which the control unit 105 recovers the adsorbent in the flow path 111 into container 137 will be described below. Note that the container 137 used when performing the normal operation mode is also used in the recovery mode.

[0108] In this case, the control unit 105 switches the switching mechanism 135 so that the flow path 111 is in the first state or the second state. The control unit 105 also closes the first valve 147 provided in the third flow path 111c which communicates with the first outlet 137c of the container 137 to be collected.

[0109] In the circuit 101 in this state, when the flow path 111 is in the first state, the mixture that has passed through the second heat recovery unit 134 passes through the shut-off valve 145 and flows into the container 136, where it is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 flows from the second outlet 136b into the second flow path 111b and is drawn into the compressor 131 through the accumulator 143. The refrigerant compressed in the compressor 131 flows into the confluence section 111d. Meanwhile, the adsorbent separated in the container 136 flows from the first outlet 136c into the third flow path 111c and is drawn into the booster 141 through the first valve 146. The adsorbent pressurized in the booster 141 flows into the confluence section 111d.

[0110] At the confluence section 111d, the refrigerant and adsorbent are mixed to form a mixture, which flows into the container 137 through the first flow path 111a, the switching mechanism 135, the first heat recovery section 133, and the switching mechanism 138. The refrigerant separated in the container 137 flows from the second outlet 137b into the second flow path 111b, and flows to the confluence section 111d through the depressurization section 132. At the confluence section 111d, it flows into the second heat recovery section 134 through the shut-off valve 144 without merging with the adsorbent.

[0111] On the other hand, the adsorbent separated in container 137 remains at the bottom of container 137 because the first valve 147 is closed. More specifically, as shown in Figure 6, the adsorbent separated in container 137 falls due to gravity and accumulates in the space S at the bottom. In Figure 6, the adsorbent accumulated in space S is shown as a hatched area. In this way, the adsorbent is recovered into container 137 in the recovery mode.

[0112] Furthermore, when the flow path 111 is in the second state, the mixture that has passed through the first heat recovery unit 133 flows into the container 136 through the switching mechanism 135 and is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 flows into the container 137 from the second outlet 136b through the accumulator 143, compressor 131, switching mechanism 135, shut-off valve 145, second heat recovery unit 134, shut-off valve 144, and switching mechanism 138. The refrigerant separated in the container 137 flows into the second flow path 111b from the second outlet 137b and flows to the confluence unit 111d through the depressurization unit 132. At the confluence unit 111d, it flows into the first heat recovery unit 133 through the switching mechanism 135 without merging with the adsorbent.

[0113] On the other hand, the adsorbent separated in container 137 remains at the bottom of container 137 because the first valve 147 is closed. In this way, the adsorbent is recovered into container 137 in the recovery mode.

[0114] (3-1-4) Method for recovering adsorbent from refrigeration equipment The method for recovering adsorbent from refrigeration equipment is described above (3-1-3-2), but to summarize, it can be said that the following steps are taken.

[0115] As shown in Figure 10, first, the adsorbent in the flow path 111 is collected into at least one of the containers 136 and 137 (step S10). Here, the adsorbent in the flow path 111 is collected into container 137. For this reason, in step S10, the first valve 147 downstream of container 137 is closed (step S11). After closing the first valve 147 (S11), the rotational speed of the compressor 131 and the booster 141 is increased (step S12).

[0116] Alternatively, before step S11, the compressor 131 and booster 141 may be started, and after closing the first valve 147 (S11), the rotational speed of the compressor 131 and booster 141 may be increased. Or, after closing the first valve 147 (S11), the compressor 131 and booster 141 may be started at a rotational speed higher than the rotational speed in normal operation mode.

[0117] When all the adsorbent in the flow path 111 has been collected in the container 137, the compressor 131 is stopped to terminate the recovery mode (step S20). At this point, the compressor 131 and the booster 141 are stopped. At this time, the refrigerant is filled into the flow path 111.

[0118] Next, the refrigerant in the flow path 111 is discharged to the outside of the refrigeration device 100 (step S30). In step S30, only a portion of the refrigerant in the flow path 111 may be discharged, but all of the refrigerant is discharged here because it is easier to control the amount of refrigerant.

[0119] In step S30, the refrigerant is released or recovered from the flow path 111. Specifically, the refrigerant is released into the atmosphere from the service ports 144a and 145a of one of the shut-off valves 144 and 145. Alternatively, the refrigerant recovery machine is connected to the service ports 144a and 145a of one of the shut-off valves 144 and 145 and operated to draw the refrigerant from the flow path 111 and recover it in a recovery cylinder connected to the refrigerant recovery machine.

[0120] Next, the container 137 is removed (step S40). The method of removal is not particularly limited, but examples include removal at the brazed joint or removal of the swage. This allows the container 137, from which the adsorbent has been collected, to be removed from the flow path 111.

[0121] By performing the above steps (S10 to S40), the adsorbent can be recovered from the refrigeration device 100. Since the flow path 111 of the refrigeration device 100 does not contain refrigerant or adsorbent, maintenance can be performed. In this embodiment, the following steps are performed in order to replace the adsorbent and enable the operation of the refrigeration device 100.

[0122] Specifically, a second container is installed (step S50). The second container may be the same as the removed container, or it may be a different container. The second container contains, for example, the replaced adsorbent. In step S50, the second container is attached to the flow path 111 by brazing, swaging, or the like.

[0123] Next, the refrigerant is filled (step S60). This step (S60) is carried out, for example, as follows.

[0124] Specifically, the flow path 111 is evacuated. Here, a vacuum pump and pressure gauge are connected to one of the service ports 144a and 145a, and the vacuum pump is driven until the pressure in the flow path 111 falls below a predetermined value. After that, refrigerant is introduced into the flow path 111. Here, a cylinder or the like containing the refrigerant is connected to one of the service ports 144a and 145a, and the refrigerant is introduced into the flow path 111.

[0125] By performing the above steps (S10 to S50), the refrigeration system 100 becomes one in which the adsorbent and refrigerant have been replaced. The control unit 105, for example, executes a trial run mode before normal operation.

[0126] (3-1-5) Features (3-1-5-1) In adsorption-type refrigeration cycles, when recovering a mixture of refrigerant and adsorbent from the flow path, the inventors have identified a problem in that the adsorbent remains in the flow path due to the difference in fluidity between the refrigerant and the adsorbent. After diligent investigation into this problem, the inventors conceived of a recovery mode in which the adsorbent is separated from the mixture and collected in a container.

[0127] Therefore, the refrigeration device 100 of this embodiment comprises a circuit 101 and a control unit 105. The circuit 101 includes a flow path 111. The flow path 111 is through which refrigerant and adsorbent material circulate. The adsorbent material adsorbs and desorbs refrigerant in accordance with changes in the pressure of the refrigerant. The control unit 105 controls the circuit 101. The circuit 101 includes a compressor 131, a first heat recovery unit 133, a second heat recovery unit 134, and containers 136 and 137. The compressor 131 compresses the refrigerant. The first heat recovery unit 133 recovers the heat generated when the adsorbent material adsorbs the refrigerant. The second heat recovery unit 134 recovers the cold energy generated when the adsorbent material desorbs the refrigerant. Container 137 collects the adsorbent material. The control unit 105 controls the circuit 101 to execute a recovery mode. In the recovery mode, the adsorbent material in the flow path 111 is collected in container 137.

[0128] In the refrigeration system 100 of this embodiment, the control unit 105 controls the circuit 101 to execute the recovery mode, so that the less fluid adsorbent can be recovered first into the container 137 from the flow path 111 through which the mixture of refrigerant and adsorbent circulates. Therefore, the refrigeration system 100 of this embodiment makes it easy to replace the adsorbent, release the refrigerant into the atmosphere, or recover it.

[0129] (3-1-5-2) In the refrigeration apparatus 100 of this embodiment, preferably, the container 137 has a first outlet 137c from which the adsorbent material flows out. The circuit 101 further includes a first valve 147 for adjusting the flow rate of the adsorbent material flowing out from the first outlet 137c.

[0130] In this configuration, closing the first valve 147 allows adsorbent material to accumulate in the container 137, while opening the first valve 147 allows the adsorbent material inside the container 137 to flow out through the first outlet 137c.

[0131] (3-1-5-3) In the refrigeration apparatus 100 of this embodiment, preferably, the container 137 further includes an inlet 137a and a second outlet 137b. The inlet 137a is into which a mixture of refrigerant and adsorbent flows. The second outlet 137b is into which the refrigerant flows out.

[0132] Here, by closing the first valve 146, the refrigerant from the mixture that flows into the container 137 from the inlet 137a is discharged from the second outlet 137b, making it easy to recover the adsorbent in the container 137.

[0133] (3-1-5-4) In the refrigeration system 100 of this embodiment, preferably, the control unit 105 controls the circuit 101 to further execute the normal operation mode. In the normal operation mode, thermal energy is recovered in the first heat recovery unit 133 and cold energy is recovered in the second heat recovery unit 134. The container 137 is placed in the flow path 111 through which the refrigerant and adsorbent circulate in the normal operation mode.

[0134] Here, the container 137 used in normal operation mode can also be used in recovery mode.

[0135] (3-1-5-5) In the refrigeration device 100 of this embodiment, preferably, the first valve 147 is closed when the recovery mode is being executed.

[0136] In this configuration, the adsorbent can be easily collected in the container 137 by closing the first valve 147 during the collection mode.

[0137] (3-1-5-6) In the refrigeration device 100 of this embodiment, preferably, the control unit 105 increases the rotational speed of the compressor 131 after closing the first valve 147.

[0138] Here, the time required for the recovery mode can be shortened by increasing the rotational speed of the compressor 131 after closing the first valve 147.

[0139] (3-1-5-7) In the refrigeration system 100 of this embodiment, preferably, the control unit 105 stops the compressor 131 when the recovery mode is terminated.

[0140] Here, once the recovery mode is finished, the operation of the refrigeration unit 100 is stopped, allowing for maintenance and other tasks to be performed.

[0141] (3-1-5-8) In the refrigeration apparatus 100 of this embodiment, the adsorbent preferably includes a metal-organic structure containing metal ions and an organic ligand.

[0142] Thus, metal-organic structures are suitably used as adsorbents for adsorbing and desorbing refrigerants.

[0143] (3-1-5-9) In the refrigeration apparatus 100 of this embodiment, the refrigerant preferably includes at least one of carbon dioxide, hydrocarbons, ammonia, water, HFCs, and HFOs.

[0144] Thus, refrigerants containing carbon dioxide, hydrocarbons, ammonia, water, HFCs, and HFOs are suitably used as refrigerants for adsorption-type refrigeration devices 100.

[0145] (3-1-5-10) The method for recovering adsorbent from the refrigeration system 100 according to this embodiment comprises a flow path 111, a compressor 131, a first heat recovery unit 133, a second heat recovery unit 134, and containers 136 and 137. The flow path 111 circulates a refrigerant and an adsorbent that adsorbs and desorbs the refrigerant in accordance with changes in the pressure of the refrigerant. The compressor 131 compresses the refrigerant. The first heat recovery unit 133 recovers the heat generated when the adsorbent adsorbs the refrigerant. The second heat recovery unit 134 recovers the cold generated when the adsorbent desorbs the refrigerant. Container 137 collects the adsorbent. The method for recovering adsorbent from the refrigeration system 100 includes a step (S10) of recovering the adsorbent in the flow path 111 into container 137.

[0146] According to the method for recovering adsorbent from the refrigeration device 100 of this embodiment, by performing the recovery step (S10), the adsorbent can be recovered into the container 137 from the flow path 111 through which the mixture of refrigerant and adsorbent circulates. In this way, the adsorbent can be recovered from the refrigeration device 100.

[0147] (3-1-5-11) The method for recovering the adsorbent from the refrigeration device 100 in this embodiment further comprises a step (S30) of discharging the refrigerant from the flow path 111 after the recovery step (S10).

[0148] In this case, the refrigerant is discharged from the flow path 111, so neither the refrigerant nor the adsorbent is present in the flow path 111. Therefore, maintenance of the refrigeration system 100 can be easily performed.

[0149] (3-1-5-12) The method for recovering the adsorbent from the refrigeration device 100 in this embodiment further includes a step of removing the container 137 (S40) after the discharge step (S30).

[0150] Here, the container 137 from which the adsorbent material has been collected is removed, making it easy to replace the adsorbent material, etc.

[0151] (3-1-5-13) The method for recovering the adsorbent from the refrigeration device 100 of this embodiment further comprises the step of attaching a second container (S50) after the step of removing it (S40).

[0152] In this way, the container can be replaced.

[0153] (3-1-6) Modification 1 of the First Embodiment In the first embodiment described above, the adsorbent is collected in one of the two containers 136 and 137, container 137, but the embodiment is not limited to this. The adsorbent may be collected in the other container 136, or in multiple containers 136 and 137.

[0154] (3-1-7) Modification 2 of the First Embodiment In the first embodiment described above, a switching mechanism 138 is provided to flow the mixture into the container 137 in the first and second states, but the embodiment is not limited to this. A bridge circuit or the like may be used, as in the refrigeration device 106 shown in Figure 9. In Figure 9, the flow when the flow path is in the first state is indicated by a solid arrow, and the flow when the flow path 111 is in the second state is indicated by a dashed arrow.

[0155] (3-2) Second Embodiment The basic configuration and operation of the refrigeration system 200 of the second embodiment shown in Figure 12 are the same as those of the refrigeration system 100 of the first embodiment. Therefore, the differences between the refrigeration system 100 and the refrigeration system 200 will be explained in detail.

[0156] (3-2-1) Configuration of the refrigeration unit 200 The refrigeration apparatus 200 of the second embodiment comprises the circuit 201 shown in Figure 11 and a control unit 105 similar to that of the first embodiment shown in Figure 5. The circuit 201 of this embodiment differs from the circuit 101 of the first embodiment in that it includes one container 136, one first valve 146, and one booster 141.

[0157] In this embodiment, the adsorbent can flow through functional components such as the pressure reduction section 132, but not through the compressor 131. Therefore, the container 136 is positioned in the flow path 111 so that the adsorbent circulating through the flow path 111 during normal operation bypasses the compressor 131. In this embodiment, a container for the adsorbent to bypass functional components is omitted.

[0158] In this embodiment, the adsorbent is collected in the container 136. The container 136 in this embodiment has an inlet 136a, a first outlet 136c, and a second outlet 136b, similar to the first embodiment shown in Figure 6. The inlet 136a is connected to the switching mechanism 135 via the first flow path 111a. The first outlet 136c is connected to the booster 141 via the third flow path 111c. The second outlet 136b is connected to the accumulator 143 via the second flow path 111b.

[0159] (3-2-2) Operation of the refrigeration unit 200 (3-2-2-1) Normal operation mode (3-2-2-1-1) First state When the flow path 111 is in the first state, as shown by the solid arrows in Figure 11, the mixture that has passed through the second heat recovery unit 134 flows into the container 136 through the shut-off valve 145 and the switching mechanism 135, where it is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 flows into the second flow path 111b from the second outlet 136b and is drawn into the compressor 131 through the accumulator 143. The refrigerant compressed in the compressor 131 flows into the confluence section 111d. Meanwhile, the adsorbent separated in the container 136 flows into the third flow path 111c from the first outlet 136c and is drawn into the booster 141 through the first valve 146. The adsorbent pressurized in the booster 141 flows into the confluence section 111d.

[0160] At the confluence section 111d, the refrigerant and adsorbent are mixed to form a mixture, which flows into the first heat recovery section 133 through the first flow path 111a and the switching mechanism 135. The mixture, which has exchanged heat with air in the first heat recovery section 133, flows into the second heat recovery section 134 through the pressure reducing section 132 and the shut-off valve 144. In the second heat recovery section 134, heat exchange is performed with air.

[0161] (3-2-2-1-2) Second state When the flow path 111 is in the second state, as shown by the dashed arrow in Figure 11, the mixture that has passed through the first heat recovery unit 133 flows into the container 136 through the switching mechanism 135 and is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 flows into the second flow path 111b from the second outlet 136b and is drawn into the compressor 131 through the accumulator 143. The refrigerant compressed in the compressor 131 flows into the confluence section 111d. Meanwhile, the adsorbent separated in the container 136 flows into the third flow path 111c from the first outlet 136c and is drawn into the booster 141 through the first valve 146. The adsorbent pressurized in the booster 141 flows into the confluence section 111d.

[0162] At the confluence section 111d, the refrigerant and adsorbent are mixed to form a mixture, which flows into the second heat recovery section 134 through the first flow path 111a, the switching mechanism 135, and the shut-off valve 145. The mixture, which has undergone heat exchange with air in the second heat recovery section 134, flows into the first heat recovery section 133 through the shut-off valve 144 and the pressure reduction section 132. Heat exchange with air takes place in the first heat recovery section 133.

[0163] (3-2-2-2) Recovery Mode The recovery mode is implemented by the control unit 105 controlling the circuit 201 to perform an operation in which the adsorbent in the flow path 111 is recovered into the container 136.

[0164] Specifically, the control unit 105 closes the first valve 146 provided in the third flow path 111c which communicates with the first outlet 136c of the container 136. The control unit 105 switches the switching mechanism 135 so that the flow path 111 is in the first state or the second state.

[0165] When the flow path 111 is in the first state, the mixture that has passed through the second heat recovery unit 134 flows into the container 136 through the shut-off valve 145 and the switching mechanism 135, where it is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 circulates from the second outlet 136b in the following order: accumulator 143, compressor 131, switching mechanism 135, first heat recovery unit 133, pressure reducing unit 132 and shut-off valve 144, and second heat recovery unit 134.

[0166] On the other hand, the adsorbent separated in container 136 remains at the bottom of container 136 because the first valve 146 is closed. In this way, the adsorbent is recovered into container 136 in the recovery mode.

[0167] Furthermore, when the flow path 111 is in the second state, the mixture that has passed through the first heat recovery unit 133 flows into the container 136 through the switching mechanism 135 and is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 circulates from the second outlet 136b in the following order: accumulator 143, compressor 131, switching mechanism 135, shut-off valve 145, second heat recovery unit 134, shut-off valve 144, pressure reducing unit 132, first heat recovery unit 133 and switching mechanism 135.

[0168] On the other hand, the adsorbent separated in container 136 remains at the bottom of container 136 because the first valve 146 is closed. In this way, the adsorbent is recovered into container 136 in the recovery mode.

[0169] (3-2-3) Method for recovering adsorbent from a refrigeration device In the step of collecting the adsorbent in the flow path 111 into the container 136 (S10), the switching mechanism 135 is switched so that the flow path 111 is in the first state or the second state. The subsequent steps (S20 to S60) are the same as in the first embodiment.

[0170] (3-2-4) Features The refrigeration apparatus 200 of this embodiment includes a container 136 from which the adsorbent is collected. The control unit 105 controls the circuit 201 to execute a collection mode in which the adsorbent in the flow path 111 is collected into the container 136.

[0171] As in the refrigeration system 200 of this embodiment, when adsorbent is flowed through functional components, the number of containers for separating the refrigerant and adsorbent from the mixture can be reduced. Also, when performing the recovery mode, the adsorbent in the flow path 111 can be recovered into a container 136 for bypassing the adsorbent to the compressor 131.

[0172] (3-2-5) Modified form of the second embodiment As shown in Figure 18, in the refrigeration device 200, an ejector mechanism 148 may be used instead of the booster 141.

[0173] The ejector mechanism 148 is a mechanism for combining the refrigerant separated in the container 136 and compressed in the compressor 131 with the adsorbent separated in the container and increasing the pressure. The ejector mechanism 148 uses the high-pressure refrigerant flowing in from the second channel 111b as the driving flow to suck in the adsorbent flowing in from the third channel 111c, increasing the pressure, and discharges the pressurized mixture into the first channel 111a.

[0174] (3-3) Third Embodiment The basic configuration and operation of the third embodiment of the refrigeration system 300 shown in Figure 12 are the same as those of the first embodiment of the refrigeration system 100. Therefore, the differences between the refrigeration system 100 and the refrigeration system 300 will be explained in detail.

[0175] (3-3-1) Configuration of the refrigeration unit 300 The refrigeration device 300 of the third embodiment comprises a circuit 301 shown in Figure 12 and a control unit 105 similar to that of the first embodiment shown in Figure 5. The circuit 301 of this embodiment, as shown in Figures 12 and 13, includes a container 136, a second valve 341, a third valve 342, an on-off valve 343, and a flow path 111e, and differs from the first embodiment in that it omits a booster.

[0176] In this embodiment, the adsorbent can flow through functional components such as the pressure reduction section 132 and the compressor 131. For this reason, in this embodiment, a container for the adsorbent circulating in the flow path 111 to bypass the compressor 131 and functional components during normal operation is omitted.

[0177] In this embodiment, the adsorbent is collected in container 136. Container 136 is located outside the flow path through which the refrigerant and adsorbent circulate in normal operation mode. In other words, container 136 is located in the flow path 111e through which the refrigerant and adsorbent do not pass when normal operation mode is performed. In other words, container 136 is located in the flow path 111e through which the refrigerant and adsorbent pass only when the recovery mode is performed. In Figure 12, the flow path 111e is located between the discharge side of the compressor 131 and the switching mechanism 135. Therefore, container 136 in this embodiment is not used in normal operation mode, but is used in recovery mode.

[0178] The flow path 111e consists of a first flow path 111e1 through which the mixture flows, a second flow path 111e2 through which the refrigerant flows, and a third flow path 111e3 through which the adsorbent flows.

[0179] As shown in Figure 12, the first valve 146 adjusts the flow rate of the adsorbent material flowing out of the first outlet 136c of the container 136, similar to the first embodiment. In this embodiment, the first valve 146 is provided in the third flow path 111e3.

[0180] The second valve 341 adjusts the flow rate of the mixture flowing in from the inlet 136a of the container 136. The second valve 341 is provided in the first flow path 111e1. The second valve 341 is, for example, a solenoid valve, an electric valve, etc., and in this case it is an electric valve.

[0181] The third valve 342 adjusts the flow rate of the refrigerant flowing out of the second outlet 136b of the container 136. The third valve 342 is located in the third flow path 111e3. The third valve 342 is, for example, a solenoid valve, an electric valve, etc., and in this case, it is an electric valve.

[0182] The on / off valve 343 is positioned in the flow path 111 between the compressor 131 and the switching mechanism 135, where it branches off to the flow path 111e.

[0183] When the control unit 105 is running in normal operation mode, it closes the first valve 146, the second valve 341, and the third valve 342, and opens the on-off valve 343. When the control unit 105 is running in recovery mode, it closes the first valve 146 and the on-off valve 343, and opens the second valve 341 and the third valve 342.

[0184] Furthermore, the control unit 105 opens the first valve 146 when the trial run mode is executed. Also, during the trial run mode, the adsorbent flows through the third flow path 111e3.

[0185] (3-3-2) Operation of the refrigeration unit 300 (3-3-2-1) Normal operation mode In normal operation mode, the first valve 146, the second valve 341, and the third valve 342 are closed, and the refrigerant and adsorbent do not flow into the flow path 111e.

[0186] (3-3-2-1-1) First state When the flow path 111 is in the first state, as shown by the solid arrows in Figure 12, the mixture that has passed through the second heat recovery unit 134 is drawn into the compressor 131 through the shut-off valve 145, the switching mechanism 135, and the accumulator 143. The mixture compressed in the compressor 131 flows into the first heat recovery unit 133 through the shut-off valve 343 and the switching mechanism 135. The mixture that has exchanged heat with air in the first heat recovery unit 133 flows into the second heat recovery unit 134 through the pressure reduction unit 132 and the shut-off valve 144. Heat exchange with air takes place in the second heat recovery unit 134.

[0187] (3-3-2-1-2) Second state When the flow path 111 is in the second state, as shown by the dashed arrow in Figure 12, the mixture that has passed through the first heat recovery unit 133 is drawn into the compressor 131 through the switching mechanism 135 and the accumulator 143. The mixture compressed in the compressor 131 flows into the second heat recovery unit 134 through the on-off valve 343, the switching mechanism 135 and the shut-off valve 145. The mixture that has exchanged heat with air in the second heat recovery unit 134 flows into the first heat recovery unit 133 through the shut-off valve 144 and the pressure reduction unit 132. Heat exchange with air takes place in the first heat recovery unit 133.

[0188] (3-3-2-2) Recovery Mode The recovery mode is implemented by the control unit 105 controlling the circuit 301 to perform an operation in which the adsorbent in the flow path 111 is recovered into the container 136. In recovery mode, the control unit 105 opens the second valve 341 and the third valve 342, while closing the first valve 146 and the on / off valve 343, and the refrigerant and adsorbent flow through the flow path 111e.

[0189] Regardless of whether the flow path 111 is in the first or second state, the mixture discharged from the compressor 131 flows into the container 136 through the first flow path 111e1 and the second valve 341. In the container 136, the mixture is separated into refrigerant and adsorbent. The refrigerant separated in the container 136 flows out from the second outlet 136b into the second flow path 111e2.

[0190] On the other hand, the adsorbent separated in container 136 remains at the bottom of container 136 because the first valve 146 is closed. In this way, the adsorbent is recovered into container 136 in the recovery mode.

[0191] (3-3-3) Method for recovering adsorbent from a refrigeration device In step S10, the process of collecting the adsorbent in the flow path 111 into the container 136 involves closing the first valve 146 and the on-off valve 343, and opening the second valve 341 and the third valve 342. After that, the rotational speed of the compressor 131 is increased. In step S10, the switching mechanism 135 is switched so that the flow path 111 is in the first or second state.

[0192] The subsequent steps (S20 to S60) are the same as in the first embodiment.

[0193] (3-3-4) Features (3-3-4-1) In the refrigeration system 300 of this embodiment, the container 136 is located outside the flow path 111 through which the refrigerant and adsorbent circulate in the normal operating mode.

[0194] Thus, container 136, which is not used in normal operation mode, may be used in recovery mode.

[0195] (3-3-4-2) In the refrigeration device 300 of this embodiment, the circuit 301 further includes a second valve 341 and a third valve 342. The second valve 341 adjusts the flow rate of the mixture flowing in from the inlet 136a. The third valve 342 adjusts the flow rate of the refrigerant flowing out from the second outlet 136b.

[0196] Here, the second valve 341 can adjust the flow rate of the mixture flowing into the container 136, and the third valve 342 can adjust the amount of refrigerant flowing out of the container 136, so that the adsorbent can be easily recovered in the container 136.

[0197] (3-3-5) Modification 1 of the third embodiment In the third embodiment described above, the container 136 is located on the discharge side of the compressor 131, but is not limited to this. The container 136 may also be located on the suction side of the compressor 131.

[0198] (3-3-6) Modification 2 of the third embodiment The basic configuration and operation of the refrigeration system 400 in the modified example 2 of the third embodiment shown in Figure 14 are the same as those of the refrigeration system 300 of the third embodiment. Therefore, the differences between the refrigeration system 300 and the refrigeration system 400 will be explained in detail.

[0199] (3-3-6-1) Configuration of Refrigeration Unit 400 The refrigeration device 400 of the third embodiment modification 2 comprises the circuit 401 shown in Figure 14 and a control unit 105 similar to that of the first embodiment shown in Figure 5. The circuit 401 of this modification includes one container 436, an on-off valve 343 similar to that of the first modification, a first recovery valve 442, and a second recovery valve 443, and differs from the first embodiment in that it omits a booster.

[0200] Container 436 is a container for recovering the adsorbent. Container 436 is located outside the flow path through which the refrigerant and adsorbent circulate in normal operation mode. In other words, container 436 is not used in normal operation mode.

[0201] The container 436 is provided in the flow path 111e through which the refrigerant and adsorbent pass, only when the recovery mode is performed. The container 436 has an inlet 436a and an outlet 436b. The mixture flows into the inlet 436a. The refrigerant flows out through the outlet 436b. The inlet 436a is located below the container 436, and the outlet 436b is located above the container.

[0202] The container 436 has a filter inside to prevent the passage of the adsorbent. The filter has pores smaller than those of the adsorbent. In other words, the filter allows the refrigerant to pass through but not the adsorbent. The adsorbent accumulates below the filter due to gravity.

[0203] The first recovery valve 442 is located in the flow path 111e on the inlet 436a side of the container 436. The second recovery valve 443 is located in the flow path 111e on the outlet 436b side of the container 436.

[0204] The control unit 105 opens the on-off valve 343 during normal operation mode and closes the on-off valve 343 during recovery mode. In addition, the control unit 105 closes the first recovery valve 442 and the second recovery valve 443 during normal operation mode and opens the first recovery valve 442 and the second recovery valve 443 during recovery mode.

[0205] (3-3-6-2) Operation of Refrigeration Unit 400 (3-3-6-2-1) Normal operation mode In normal operation mode, the on / off valve 343 is open, the first recovery valve 442 and the second recovery valve 443 are closed, and the refrigerant and adsorbent do not flow into the flow path 111e. Therefore, the operation when the flow path 111 is in the first and second states is the same as in the third embodiment.

[0206] (3-3-6-2-2) Recovery Mode The recovery mode is implemented by the control unit 105 controlling the circuit 401 to perform an operation in which the adsorbent in the flow path 111 is recovered into the container 436. In recovery mode, the control unit 105 closes the on / off valve 343 and opens the first recovery valve 442 and the second recovery valve 443, and the refrigerant and adsorbent flow through the flow path 111e.

[0207] Regardless of whether the flow path 111 is in the first or second state, the mixture discharged from the compressor 131 flows into the container 436 through the flow path 111 and the first recovery valve 442. Of the mixture that flows in from the bottom of the container 436, the refrigerant passes through the filter and flows out of the outlet 436b through the flow path 111e and the second recovery valve 443, into the flow path 111 in which the mixture circulates in normal operation mode.

[0208] On the other hand, the adsorbent separated in container 436 does not pass through the filter and remains at the bottom of container 436. In this way, in recovery mode, the adsorbent is recovered in container 436.

[0209] (3-3-6-3) Method for recovering adsorbent from a refrigeration device The adsorbent in the flow path 111 is collected in the container 436 (step S10). In step S10, the on-off valve 343 is closed and the first recovery valve 442 and the second recovery valve 443 are opened. After that, the rotational speed of the compressor 131 is increased. The subsequent steps (S20 to S60) are the same as in the first embodiment.

[0210] (3-3-7) Modification 3 of the third embodiment The basic configuration and operation of the refrigeration system 500 in the modified example 3 of the third embodiment shown in Figure 15 are the same as those of the refrigeration system 400 in the modified example 2. Therefore, the differences between the refrigeration system 400 and the refrigeration system 500 will be explained in detail.

[0211] (3-3-7-1) Configuration of Refrigeration Unit 500 The refrigeration device 500 of the third embodiment modification 3 comprises the circuit 501 shown in Figure 15 and a control unit 105 similar to that of the first embodiment shown in Figure 5. The circuit 501 of this modification, similar to that of modification 2, includes one container 436, an on-off valve 343, a first recovery valve 442, and a second recovery valve 443.

[0212] The container 436 is located outside the flow path through which the refrigerant and adsorbent circulate in normal operation mode. In this modified example, the container 436 is located on the suction side of the compressor 131. In Figure 15, the container 436 is located between the accumulator 143 and the switching mechanism 135.

[0213] (3-3-7-2) Operation of Refrigeration Unit 500 (3-3-7-2-1) Normal operation mode In normal operation mode, the control unit 105 opens the on-off valve 343 and closes the first recovery valve 442 and the second recovery valve 443, so that the refrigerant and adsorbent do not flow into the flow path 111e. Therefore, the operation when the flow path 111 is in the first and second states is the same as in the third embodiment.

[0214] (3-3-7-2-2) Recovery Mode In recovery mode, the control unit 105 closes the on / off valve 343, and opens the first recovery valve 442 and the second recovery valve 443, allowing the refrigerant and adsorbent to flow through the flow path 111e.

[0215] Specifically, the control unit 105 switches the switching mechanism 135 so that the flow path 111 is in the first state or the second state.

[0216] When the flow path 111 is in the first state, as shown by the solid arrows in Figure 15, the mixture that has passed through the second heat recovery unit 134 flows into the container 436 through the shut-off valve 145, the switching mechanism 135, the flow path 111e, and the first recovery valve 442. Of the mixture, the refrigerant that has passed through the filter flows from the outlet 436b through the flow path 111e and the second recovery valve 443 into the flow path 111 in which the mixture circulates in normal operation mode.

[0217] On the other hand, the adsorbent separated in container 436 does not pass through the filter and remains at the bottom of container 436. In this way, in recovery mode, the adsorbent is recovered in container 436.

[0218] When the flow path 111 is in the second state, as shown by the dotted line in Figure 15, the mixture that has passed through the first heat recovery unit 133 flows into the container 436 through the switching mechanism 135, the flow path 111e, and the first recovery valve 442. Of the mixture, the refrigerant that has passed through the filter flows from the outlet 436b through the flow path 111e and the second recovery valve 443 into the flow path 111 in which the mixture circulates in normal operation mode.

[0219] On the other hand, the adsorbent separated in container 436 does not pass through the filter and remains at the bottom of container 436. In this way, in recovery mode, the adsorbent is recovered in container 436.

[0220] (4) Variations Modifications of the first to third embodiments will be described below.

[0221] (4-1) Variation A (4-1-1) Configuration and Operation In the first to third embodiments described above, a step (S40) is performed to remove the containers 136, 137, and 436 for recovering the adsorbent from the flow path 111, but the invention is not limited thereto. The method for recovering the adsorbent from the refrigeration apparatus in this modified example comprises the steps of removing the adsorbent from the containers 136, 137, and 436, and filling the containers 136, 137, and 436 with the adsorbent.

[0222] Figure 16 is a diagram illustrating the process of removing the adsorbent from the container 136 and the process of filling the container 136 with the adsorbent according to the second embodiment. As shown in Figure 16, the refrigeration apparatus of this modified example comprises a filling pipe 151, a discharge pipe 152, a valve 153 provided on the filling pipe 151, and a valve 154 provided on the discharge pipe 152. The filling pipe 151 and the discharge pipe 152 do not constitute a flow path 111 through which the refrigerant and adsorbent flow during normal operation mode and recovery mode. The valves 153 and 154 are, for example, solenoid valves, motorized valves, etc., and in this case, solenoid valves.

[0223] In this modified method for recovering adsorbent from a refrigeration device, as shown in Figure 17, the step of removing the container (S40) is replaced with the step of removing the adsorbent from containers 136, 137, and 436 (S70). Also, in this modified method for recovering adsorbent from a refrigeration device, the step of filling the second container (S80) is replaced with the step of attaching the second container (S50).

[0224] Specifically, in the step of recovering the adsorbent in the flow path 111 into containers 136, 137, and 436 (S10), the step of closing valves 153 and 154 (S13) is performed before the step of increasing the rotational speed of compressor 131 (S12).

[0225] In the process of removing the adsorbent (S70), a recovery container is attached below the discharge pipe 152 and the valve 154 is opened. Due to gravity, the adsorbent moves through the discharge pipe 152 to the recovery container.

[0226] In the step of filling with adsorbent material (S80), with valve 154 closed and valve 153 open, the adsorbent material is filled from above the filling pipe 151. Due to gravity, the adsorbent material passes through the filling pipe 151 and fills the container 136.

[0227] (4-1-2) Features The method for recovering the adsorbent from the refrigeration device 100 in this modified example further includes a step (S70) of removing the adsorbent from containers 136, 137, and 436. In this case, the adsorbent can be removed while container 136 remains in place.

[0228] Furthermore, the method for recovering adsorbent from the refrigeration apparatus in this modified example further includes a step (S80) of filling containers 136, 137, and 436 with adsorbent. In this step, the adsorbent can be filled while container 136 remains in place.

[0229] (4-2) Modification B The adsorbents used in refrigeration units 100, 200, 300, 400, and 500 are metal-organic structures. However, materials other than metal-organic structures may be used as adsorbents. Examples of materials other than metal-organic structures include activated carbon, zeolite-based materials, silica-based materials, and alumina-based materials.

[0230] (4-3) Modification C In the above embodiment, an air conditioning system was used as an example, but the invention is not limited thereto. The heat exchange medium that exchanges heat with the heat generated in the first heat recovery unit 133 and the second heat recovery unit 134 may be water, brine, or the like.

[0231] While embodiments of this disclosure have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of this disclosure as described in the claims. [Explanation of Symbols]

[0232] 100, 106, 200, 206, 300, 400, 500: Refrigeration equipment 101,201,301,401,501: Circuit 105: Control Unit 111,111a,111b,111c: flow path 131: Compressor 133: First heat recovery unit 134: Second heat recovery unit 136,137,436: Container 136a,137a:Inlet 136c,137c: 1st outlet 136b,137b: 2nd outlet 146,147: First valve 341: Second valve 342: Third valve [Prior art documents] [Patent Documents]

[0233] [Patent Document 1] U.S. Patent Application Publication No. 2023 / 0417459

Claims

1. A circuit (101) including a flow path (111) through which a refrigerant and an adsorbent that adsorbs and desorbs the refrigerant in response to changes in the pressure of the refrigerant circulate, A control unit (105) that controls the circuit, Equipped with, The aforementioned circuit is A compressor (131) for compressing the refrigerant, A first heat recovery unit (133, 134) recovers the heat generated when the adsorbent adsorbs the refrigerant, A second heat recovery section (134, 133) recovers the cold energy generated when the adsorbent desorbs the refrigerant, A container (136, 137) from which the adsorbent is collected, Includes, The control unit controls the circuit to perform a recovery mode in which the adsorbent in the flow path is recovered into the container, and the refrigeration device (100).

2. The container has a first outlet (136c, 137c) from which the adsorbent material flows out. The circuit further includes a first valve (146, 147) for adjusting the flow rate of the adsorbent material flowing out from the first outlet. The refrigeration apparatus (100, 200) according to claim 1.

3. The aforementioned container is Inlets (136a, 137a) into which the mixture of the refrigerant and the adsorbent flows, The second outlet (136b, 137b) from which the refrigerant flows out, It further possesses, The refrigeration apparatus according to claim 2.

4. The control unit controls the circuit to further execute a normal operating mode in which thermal energy is recovered in the first heat recovery unit and cold energy is recovered in the second heat recovery unit. The container is placed in the flow path through which the refrigerant and the adsorbent circulate in the normal operating mode. A refrigeration apparatus according to any one of claims 1 to 3.

5. The control unit controls the circuit to further execute a normal operating mode in which thermal energy is recovered in the first heat recovery unit and cold energy is recovered in the second heat recovery unit. The container is located outside the flow path through which the refrigerant and the adsorbent circulate in the normal operating mode. A refrigeration apparatus according to any one of claims 1 to 3.

6. The aforementioned container is An inlet into which the mixture of the refrigerant and the adsorbent flows, The second outlet from which the refrigerant flows out, It further possesses, The aforementioned circuit is A second valve (341) adjusts the flow rate of the mixture flowing in from the inlet, A third valve (342) adjusts the flow rate of the refrigerant flowing out from the second outlet, Further including, The refrigeration apparatus according to claim 5.

7. The control unit closes the first valve when the recovery mode is being executed. The refrigeration apparatus according to claim 2 or 3.

8. After closing the first valve, the control unit increases the rotational speed of the compressor. The refrigeration apparatus according to claim 7.

9. When the recovery mode is terminated, the control unit stops the compressor. The refrigeration apparatus according to claim 8.

10. The adsorbent includes a metal-organic structure containing metal ions and an organic ligand. A refrigeration apparatus according to any one of claims 1 to 3.

11. The refrigerant comprises at least one of carbon dioxide, hydrocarbons, ammonia, water, HFCs, and HFOs. A refrigeration apparatus according to any one of claims 1 to 3.

12. A flow path (111) through which a refrigerant and an adsorbent that adsorbs and desorbs the refrigerant in response to changes in the pressure of the refrigerant circulate, A compressor (131) for compressing the refrigerant, A first heat recovery unit (133, 134) recovers the heat generated when the adsorbent adsorbs the refrigerant, A second heat recovery section (134, 133) recovers the cold energy generated when the adsorbent desorbs the refrigerant, A container (136, 137) from which the adsorbent is collected, A method for recovering the adsorbent from a refrigeration device (100), comprising: A method for recovering adsorbent from a refrigeration device (100), comprising the step (S10) of recovering the adsorbent in the flow path into the container.

13. A method for recovering adsorbent from a refrigeration apparatus according to claim 12, further comprising the step of discharging the refrigerant from the flow path after the recovery step (S30).

14. The process further includes removing the container after the discharge step (S40), A method for recovering adsorbent from a refrigeration apparatus according to claim 13.

15. The process further includes the step of attaching the second container (S50) after the removal step, A method for recovering adsorbent from a refrigeration apparatus according to claim 14.

16. The process further includes the step (S70) of removing the adsorbent from the container. A method for recovering adsorbent from a refrigeration apparatus according to claim 12 or 13.

17. The process further includes filling the container with the adsorbent (S80). A method for recovering adsorbent from a refrigeration apparatus according to claim 16.

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