Ice storage tank and ice storage system for central air conditioner

Abstract

The present invention belongs to the technical field of ice storage tanks, and specifically is an ice storage type ice storage tank for central air conditioning, comprising a tank body; a group of columns are fixedly connected to the bottom end of the tank body; an annular coil is fixedly connected to the bottom end of the inner wall of the tank body; a first water inlet pipe and a first water outlet pipe are fixedly connected to the side wall of the tank body; the water inlet of the annular coil and the first water inlet pipe are communicated with each other, and the water outlet of the annular coil and the first water outlet pipe are communicated with each other; a second water inlet pipe is fixedly connected to the center of the top end of the tank body; and a second water outlet pipe is fixedly connected to the center of the bottom end of the tank body; the problem that the refrigerant in the ice storage tank flows in the coil and freezes the water outside the coil into ice, and when the water contacting the coil freezes into ice (ice wraps the tube), the heat conduction efficiency of the refrigerant is reduced; the heat medium flows in the coil, absorbs the cold energy of the ice outside the coil, and then releases the cold energy to the end through the plate exchanger, and when the ice contacting the coil melts and becomes water (water wraps the tube), the cooling speed is reduced and the cooling demand cannot be met.

Description

Technical Field

[0001] The invention belongs to the technical field of ice storage tanks, in particular to an ice storage tank and an ice storage system for a central air conditioner. Background Art

[0002] Cold storage technology is to use electric refrigeration machines to store cold energy in the form of cold water or other media during the night when the power load is low. During the day when the power load is high, the refrigeration machine is not turned on or turned on less, and the cold energy stored at night is fully utilized for cooling, thereby achieving the purpose of shifting the power load to the peak and filling the valley.

[0003] At present, there are three main types of cold storage methods on the market: water storage, ice storage and phase change storage. The cold storage system of central air conditioners uses water ice storage tanks for cold storage.

[0004] In the prior art, the refrigerant in the ice storage tank flows in the coil and freezes the water outside the coil. When the water in contact with the coil freezes into ice (ice wraps the tube), the heat conduction efficiency of the refrigerant is reduced; the heat medium flows in the coil, absorbs the cold energy of the ice outside the coil, and then releases the cold energy to the end through the plate exchanger. When the ice in contact with the coil melts and becomes water (water wraps the tube), the cooling speed is reduced and the cooling demand cannot be met. Therefore, the present invention provides an ice storage tank and an ice storage system for central air conditioning. Summary of the invention

[0005] Based on this, the purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and provide an ice storage tank for central air conditioning.

[0006] In order to make up for the shortcomings of the prior art, the refrigerant in the ice storage tank flows in the coil and freezes the water outside the coil. When the water in contact with the coil freezes into ice (ice wraps the tube), the heat conduction efficiency of the refrigerant begins to decrease; the heat medium flows in the coil, absorbs the cold energy of the ice outside the coil, and releases the cold energy to the end through the plate exchanger. When the ice in contact with the coil melts and becomes water (water wraps the tube), the cooling speed decreases and cannot meet the cooling demand. The present invention proposes an ice storage tank for central air conditioning.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the ice storage tank for central air conditioning described in the present invention comprises a tank body; a group of columns are fixedly connected to the bottom end of the tank body; an annular coil is fixedly connected to the bottom end of the inner wall of the tank body; a first water inlet pipe and a first water outlet pipe are fixedly connected to the side wall of the tank body; the water inlet of the annular coil and the first water inlet pipe are connected to each other, and the water outlet of the annular coil and the first water outlet pipe are connected to each other; a second water inlet pipe is fixedly connected to the center of the top end of the tank body; a second water outlet pipe is fixedly connected to the center of the bottom end of the tank body; the side wall of the tank body A water pump is fixedly connected to the wall; the second water inlet pipe and the second water outlet pipe are both interconnected with the water pump; the water pump is used to drive the water flow in the tank to melt the ice on the surface of the frozen annular coil to avoid thickening of the ice layer. Similarly, when the heat medium flows in the annular coil, in order to avoid the annular coil being wrapped by water and affecting the cooling speed, the flow state of water is used. After the cold water releases the coldness through the cooling plate exchanger, it becomes water at about 10°C, rushes on the ice layer to melt the ice, and then turns back into cold water after the ice melts, thereby ensuring the cooling capacity of the heat medium in the annular pipe and meeting the cooling demand.

[0008] Preferably, a first rotating shaft is provided in the second water inlet pipe through a rotating part; the bottom end of the first rotating shaft extends into the center of the annular coil, and a second rotating shaft is provided on the outer wall of the first rotating shaft; a group of stirring plates are fixedly connected to the outer wall of the second rotating shaft; the annular coil can be fully flowed as a whole to ensure its uniform heat dissipation, and can also further avoid cold storage of the refrigerant, thereby further improving the ice melting efficiency.

[0009] Preferably, the rotating part includes an annular groove; an annular groove is opened on the inner wall of the second water inlet pipe; a pair of rotating columns are fixedly connected to the outer wall of the first rotating shaft, and the rotating columns are slidably connected in the annular groove; the first rotating shaft is located on the axis of the second water inlet pipe and has threaded blades fixedly connected; the impact force of the water flow through the water pump in the second water inlet pipe can ensure the maintenance of the rotational force behind the first rotating shaft, thereby ensuring the rotation state of the first rotating shaft.

[0010] Preferably, the second rotating shaft is rotatably connected to the side wall of the first rotating shaft; a first gear is fixedly connected to the outer side wall of the second rotating shaft; a fixing column is fixedly connected to the tube wall at the bottom end of the second water inlet pipe, and an annular rack is fixedly connected to the bottom end of the fixing column; the annular rack and the first gear are meshed with each other; the annular rack and the first gear are meshed with each other, so that the second rotating shaft rotates, thereby ensuring that during the flow of the heat medium, the ice water can be better mixed for heat release treatment.

[0011] Preferably, a filter is fixedly connected to the water inlet of the second water outlet pipe; a scraper is fixedly connected to the bottom end of the first rotating shaft, and the bottom end of the scraper and the filter are in contact with each other; the scraper is used to clean the ice on the filter to avoid clogging of the filter by ice.

[0012] Preferably, the cross section of the scraper is an inverted triangle; when in operation, the cross section of the scraper is an inverted triangle, which can improve the cleaning effect of the filter screen.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The ice storage tank for central air conditioning described in the present invention uses a water pump to drive the water flow in the tank body to melt the ice on the surface of the frozen annular coil to avoid the thickening of the ice layer. Similarly, when the heat medium flows in the annular coil, in order to avoid the annular coil being wrapped by water and affecting the cooling speed, the flow state of water is used. After the cold water releases the coldness through the cooling plate exchanger, it becomes water at about 10°C and rushes on the ice layer to melt the ice. After the ice melts, it becomes cold water again, thereby ensuring the cooling capacity of the heat medium in the annular pipe and meeting the cooling demand.

[0015] 2. The ice storage tank for central air conditioning described in the present invention meshes with the annular rack and the first gear, thereby allowing the second rotating shaft to rotate, thereby ensuring that ice and water can be better mixed for heat release during the flow of heat medium.

[0016] The present invention also provides an ice storage system, including the above-mentioned ice storage tank for central air conditioning; the tank body is provided with a water inlet and a water outlet; it also includes a dual-condition refrigeration main unit, an ice storage tank cooling plate exchanger, an ethylene glycol pump and a cooling pump; the water outlet of the tank body, the cooling pump, the ice storage tank cooling plate exchanger, and the water inlet of the tank body are interconnected to form a loop; the first water outlet pipe of the tank body, the ethylene glycol pump, the dual-condition refrigeration main unit, and the first water inlet pipe of the tank body are interconnected to form a loop.

[0017] Preferably, it also includes a liquid replenishing tank; the liquid replenishing tank is connected between the ethylene glycol pump and the first water outlet pipe of the tank body.

[0018] Preferably, it also includes a host cooling plate exchanger; the host cooling plate exchanger is interconnected with the liquid replenishment tank, the ethylene glycol pump and the dual-mode refrigeration host to form a loop.

[0019] The ice storage system of the present invention sets a dual-mode refrigeration host, and can choose to supply cooling to the host with a cooling plate exchanger or an ice storage device for refrigeration. Then the user can choose to use the host cooling plate exchanger or the ice storage tank cooling plate exchanger for air conditioning cooling. It is more cost-effective than the existing ice storage system, has a higher cooling efficiency, and a cooling rate as fast as water storage. The ice storage volume is about one-eighth of that of water, and the structure is simple.

[0020] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a three-dimensional diagram of the ice storage tank for central air conditioning of the present invention;

[0022] Figure 2 is a cross-sectional view of an ice storage tank for a central air conditioner of the present invention;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0024] Figure 4 yes Figure 2 The enlarged view of the part at B in the middle;

[0025] Figure 5 It is a top cross-sectional view of an ice storage tank for a central air conditioner of the present invention;

[0026] Figure 6 It is a schematic diagram of the connection relationship of the ice storage system of the present invention.

[0027] In the figure: 1. tank body; 11. column; 12. annular coil; 13. first water inlet pipe; 14. first water outlet pipe; 15. second water inlet pipe; 16. second water outlet pipe; 17. water pump; 18. water inlet; 19. water outlet; 2. first rotating shaft; 21. second rotating shaft; 22. stirring plate; 23. annular groove; 24. rotating column; 25. threaded blades; 26. fixed column; 27. first gear; 28. annular rack; 3. filter screen; 31. scraper; 4. dual-mode refrigeration host; 5. ice storage tank cold plate exchanger; 6. ethylene glycol pump; 7. cooling pump; 8. liquid replenishment tank; 9. host cold plate exchanger. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] It should be understood that, in the description of the present application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, that is, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, unless otherwise specified, "multiple" means two or more.

[0030] It should be noted that, in the description of this application, unless otherwise clearly specified and limited, the terms "disposed", "connected", "connected", and "hollow" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] like Figures 1 to 5As shown, the ice storage tank for central air conditioning of the present invention comprises a tank body 1; a group of columns 11 are fixedly connected to the bottom end of the tank body 1; an annular coil 12 is fixedly connected to the bottom end of the inner wall of the tank body 1; a first water inlet pipe 13 and a first water outlet pipe 14 are fixedly connected to the side wall of the tank body 1; the water inlet of the annular coil 12 and the first water inlet pipe 13 are connected to each other, and the water outlet of the annular coil 12 and the first water outlet pipe 14 are connected to each other; a first water outlet pipe 14 is fixedly connected to the top center of the tank body 1 The second water inlet pipe 15; the second water outlet pipe 16 is fixedly connected to the center of the bottom end of the tank body 1; the water pump 17 is fixedly connected to the side wall of the tank body 1; the second water inlet pipe 15 and the second water outlet pipe 16 are both connected to the water pump 17; in the prior art, the refrigerant in the ice storage tank flows in the coil and freezes the water outside the coil. When the water contacting the coil freezes (ice wraps the pipe), the heat conduction efficiency of the refrigerant begins to decrease; the heat medium flows in the coil, absorbs the coldness of the ice outside the coil, and then passes through the plate exchange The device releases the cold to the end. When the ice contacting the coil melts and becomes water (water wraps the tube), the cooling speed is reduced and cannot meet the cooling demand. For this reason, when the present invention is working, the coil in the tank body 1 is set as an annular coil 12, and a water pump 17, a second water outlet pipe 16 and a second water inlet pipe 15 are provided. When the water storage pipe is storing cold, the refrigerant flows in the annular coil 12. In order to prevent the water on the surface of the annular coil 12 from freezing into ice and affecting the refrigerant conduction efficiency, the water pump 17 is used to drive the water flow in the tank body 1 to melt the ice on the surface of the frozen annular coil 12 to avoid the thickening of the ice layer. Similarly, when the heat medium flows in the annular coil 12, in order to prevent the annular coil 12 from being wrapped by water and affecting the cooling speed, the flow state of water is used. After the cold water releases the cold through the cooling plate exchanger, it becomes water at about 10°C, rushes on the ice layer to melt the ice, and then turns back into cold water after the ice melts, thereby ensuring the cooling of the heat medium in the annular pipe and meeting the cooling demand.

[0032] A first rotating shaft 2 is provided in the second water inlet pipe 15 through a rotating member; the bottom end of the first rotating shaft 2 extends into the center of the annular coil 12, and a second rotating shaft 21 is provided on the outer wall of the first rotating shaft 2; a group of stirring plates 22 are fixedly connected to the outer wall of the second rotating shaft 21; during operation, when the water pump 17 is working, the second water inlet pipe 15 is in a water-intake state, and the flow of water can drive the first rotating shaft 2 to rotate through the rotating member. The rotation of the first rotating shaft 2 can facilitate the rotation of the water stored in the tank body 1, and can fully flow the entire annular coil 12 to ensure its uniform heat dissipation, and can also further avoid cold storage of the refrigerant, thereby further improving the ice melting efficiency.

[0033] The rotating part includes an annular groove 23; an annular groove 23 is opened on the inner wall of the second water inlet pipe 15; a pair of rotating columns 24 are fixedly connected to the outer wall of the first rotating shaft 2, and the rotating columns 24 are slidably connected in the annular groove 23; the first rotating shaft 2 is located on the axis of the second water inlet pipe 15 and is fixedly connected with threaded blades 25; when working, after the water flows into the second water inlet pipe 15, the threaded blades 25 are used to rotate the first rotating shaft 2, and then the rotating columns 24 are rotated in the annular groove 23. The impact force of the water flow through the water pump 17 in the second water inlet pipe 15 can ensure the maintenance of the rear rotation force of the first rotating shaft 2, thereby ensuring the rotation state of the first rotating shaft 2.

[0034] The second rotating shaft 21 is rotatably connected to the side wall of the first rotating shaft 2; a first gear 27 is fixedly connected to the outer side wall of the second rotating shaft 21; a fixing column 26 is fixedly connected to the tube wall at the bottom end of the second water inlet pipe 15, and a ring rack 28 is fixedly connected to the bottom end of the fixing column 26; the ring rack 28 and the first gear 27 are meshed with each other; during operation, when the second rotating shaft 21 rotates around the first rotating shaft 2, at this time, because the ring rack 28 is fixed to the bottom end of the second water inlet pipe 15 through the fixing column 26, the ring rack 28 is in a fixed state, but the second rotating shaft 21 is in a rotating state around the first rotating shaft 2, and then the ring rack 28 and the first gear 27 are meshed with each other, so that the second rotating shaft 21 rotates, thereby ensuring that during the flow of heat medium, the ice water can be better mixed for heat release treatment.

[0035] A filter screen 3 is fixedly connected to the water inlet of the second water outlet pipe 16; a scraper 31 is fixedly connected to the bottom end of the first rotating shaft 2, and the bottom end of the scraper 31 and the filter screen 3 are in contact with each other; when working, the filter screen 3 can prevent the ice-water mixture from entering the water pump 17 through the second water outlet pipe 16 and affecting the operation of the water pump 17. At the same time, the scraper 31 is used to clean the ice on the filter screen 3 to prevent the filter screen 3 from being blocked by ice cubes.

[0036] The cross section of the scraper 31 is an inverted triangle. When working, the cross section of the scraper 31 is an inverted triangle, which can improve the cleaning effect of the filter screen 3.

[0037] Working principle: In the prior art, the refrigerant in the ice storage tank flows in the coil, freezing the water outside the coil. When the water in contact with the coil freezes into ice (ice wraps the tube), the heat transfer efficiency of the refrigerant begins to decrease; the heat medium flows in the coil, absorbs the coldness of the ice outside the coil, and releases the coldness to the end through the plate exchanger. When the ice in contact with the coil melts and becomes water (water wraps the tube), the cooling speed decreases and cannot meet the cooling demand. For this reason, when the present invention is working, the coil in the tank body 1 is set as an annular coil 12, and a water pump 17, a second water outlet pipe 16 and a second water inlet pipe 15 are provided. When the water storage pipe is storing cold, the refrigerant When the heat medium flows in the annular coil 12, in order to prevent the water on the surface of the annular coil 12 from freezing into ice and affecting the refrigerant conduction efficiency, the water pump 17 is used to drive the water flow in the tank 1 to melt the ice on the surface of the frozen annular coil 12 to avoid the thickening of the ice layer. Similarly, when the heat medium flows in the annular coil 12, in order to prevent the annular coil 12 from being wrapped by water and affecting the cooling speed, the flow state of water is used. After the cold water releases the coldness through the cooling plate exchanger, it becomes water at about 10°C, rushes on the ice layer to melt the ice, and then turns back into cold water after the ice melts, ensuring the cooling capacity of the heat medium in the annular pipeline to meet the cooling demand. When the water pump 17 is working, the second water inlet pipe 15 is in a water-intake state. The flow of water can drive the first rotating shaft 2 to rotate through the rotating member. The rotation of the first rotating shaft 2 can conveniently rotate the water stored in the tank body 1, and can fully flow the annular coil 12 as a whole to ensure its uniform heat dissipation. It can also further avoid the cold storage of the refrigerant and further improve the ice melting efficiency. After the water flows into the second water inlet pipe 15, the threaded blades 25 are used to rotate the first rotating shaft 2, and then the rotating column 24 is rotated in the annular groove 23. 7, can ensure the maintenance of the rotational force behind the first rotating shaft 2, thereby ensuring the rotational state of the first rotating shaft 2; when the second rotating shaft 21 rotates around the first rotating shaft 2, at this time, because the annular rack 28 is fixed to the bottom end of the second water inlet pipe 15 through the fixing column 26, the annular rack 28 is in a fixed state, but the second rotating shaft 21 is in a rotating state around the first rotating shaft 2, and then the annular rack 28 and the first gear 27 are engaged with each other, thereby allowing the second rotating shaft 21 to rotate, thereby ensuring that during the flow of the heat medium, the ice water can be better mixed for heat release treatment.

[0038] like Figure 6 As shown, the ice storage system of the present invention comprises the above-mentioned ice storage tank for central air conditioning, a dual-mode refrigeration host 4, an ice storage tank cold supply plate exchanger 5, an ethylene glycol pump 6, a cooling pump 7, a liquid replenishment tank 8, and a host cold supply plate exchanger 9;

[0039] The tank body is provided with a water inlet 18 and a water outlet 19; the water outlet 19 of the tank body, the cooling pump 7, the ice storage tank cooling plate exchanger 5, and the water inlet 18 of the tank body are interconnected to form a loop; the first water outlet pipe 14 of the tank body, the ethylene glycol pump 6, the dual-mode refrigeration host 4, and the first water inlet pipe 13 of the tank body are interconnected to form a loop; the liquid replenishment tank 8 is connected between the ethylene glycol pump 6 and the first water outlet pipe 14 of the tank body;

[0040] The host cooling plate exchanger 9 is connected to the liquid replenishment tank 8, the ethylene glycol pump 6 and the dual-mode refrigeration host 4 to form a loop.

[0041] The ice storage system of the present invention sets a dual-mode refrigeration host, and can choose to supply cooling plate exchangers or ice storage devices to the host for refrigeration according to different time periods. Then the user can choose to use the host cooling plate exchanger or the ice storage tank cooling plate exchanger for air conditioning cooling. It is more cost-effective than the existing ice storage system, has higher storage and release efficiency, and the cooling rate is as fast as water storage. The ice storage volume is about one eighth of that of water, and the structure is simple.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An ice storage tank for central air conditioning, characterized in that: The invention comprises a tank body (1); a group of columns (11) are fixedly connected to the bottom end of the tank body (1); an annular coil (12) is fixedly connected to the bottom end of the inner wall of the tank body (1); a first water inlet pipe (13) and a first water outlet pipe (14) are fixedly connected to the side wall of the tank body (1); the water inlet of the annular coil (12) and the first water inlet pipe (13) are connected to each other, and the water outlet of the annular coil (12) and the first water outlet pipe (14) are connected to each other; a second water inlet pipe (15) is fixedly connected to the center of the top end of the tank body (1); a second water outlet pipe (16) is fixedly connected to the center of the bottom end of the tank body (1); a water pump (17) is fixedly connected to the side wall of the tank body (1); the second water inlet pipe (15) and the second water outlet pipe (16) are both connected to the water pump (17); A first rotating shaft (2) is provided in the second water inlet pipe (15) through a rotating member; the bottom end of the first rotating shaft (2) extends into the center of the annular coil (12), and a second rotating shaft (21) is provided on the outer wall of the first rotating shaft (2); a group of stirring plates (22) are fixedly connected to the outer wall of the second rotating shaft (21); The rotating member comprises an annular groove (23); an annular groove (23) is provided on the inner wall of the second water inlet pipe (15); a pair of rotating columns (24) are fixedly connected to the outer wall of the first rotating shaft (2), and the rotating columns (24) are slidably connected in the annular groove (23); and a threaded blade (25) is fixedly connected to the axis of the first rotating shaft (2) located on the second water inlet pipe (15).

2. The ice storage tank for central air conditioning according to claim 1, characterized in that: The second rotating shaft (21) is rotatably connected to the side wall of the first rotating shaft (2); a first gear (27) is fixedly connected to the outer side wall of the second rotating shaft (21); a fixing column (26) is fixedly connected to the wall of the bottom end of the second water inlet pipe (15), and an annular rack (28) is fixedly connected to the bottom end of the fixing column (26); the annular rack (28) and the first gear (27) are meshed with each other.

3. The ice storage tank for central air conditioning according to claim 2, characterized in that: A filter screen (3) is fixedly connected to the water inlet of the second water outlet pipe (16); a scraper (31) is fixedly connected to the bottom end of the first rotating shaft (2), and the bottom end of the scraper (31) and the filter screen (3) are in contact with each other.

4. The ice storage tank for central air conditioning according to claim 3, characterized in that: The cross section of the scraper (31) is an inverted triangle.

5. An ice storage system, characterized in that: The invention comprises an ice storage tank for central air conditioning as claimed in any one of claims 1 to 4; the tank body is provided with a water inlet (18) and a water outlet (19); the invention also comprises a dual-mode refrigeration main unit (4), an ice storage tank cooling plate exchanger (5), an ethylene glycol pump (6) and a cooling pump (7); the water outlet (19) of the tank body, the cooling pump (7), the ice storage tank cooling plate exchanger (5) and the water inlet (18) of the tank body are interconnected to form a loop; the first water outlet pipe (14) of the tank body, the ethylene glycol pump (6), the dual-mode refrigeration main unit (4) and the first water inlet pipe (13) of the tank body are interconnected to form a loop.

6. The ice storage system according to claim 5, characterized in that: It also includes a liquid replenishing tank (8); the liquid replenishing tank (8) is connected between the ethylene glycol pump (6) and the first water outlet pipe (14) of the tank body.

7. The ice storage system according to claim 6, characterized in that: It also includes a host cooling plate exchanger (9); The host cooling plate exchanger (9) is interconnected with the liquid replenishment tank (8), the ethylene glycol pump (6) and the dual-mode refrigeration host (4) to form a loop.

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