A refrigeration system suitable for places with high per capita space occupancy

Abstract

The present invention relates to a refrigeration system suitable for places with high per capita space occupancy, comprising an energy storage module, a storage and transportation module, and an energy storage suit. The energy storage module comprises a refrigeration device, a cold plate assembly, and several flexible energy storage bags, wherein the flexible energy storage bags are encapsulated with an inorganic salt phase change material, and the phase change temperature of the inorganic salt phase change material is 22°C to 28°C. The refrigeration device is connected to the cold plate assembly and serves as a cooling source for the cold plate assembly. The cold plate assembly is used to transfer heat with the flexible energy storage bag, causing the inorganic salt phase change material in the flexible energy storage bag to change to a solid state due to cooling. The storage and transportation module is an insulating and heat-insulating container for storing the flexible energy storage bag. The energy storage suit is a work suit having several placement pockets on the side of the work suit that fits the human body, and the placement pockets are used to embed the flexible energy storage bags. This technical solution is not limited by the use space or location, has a low initial investment cost, and low power consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of space refrigeration, and in particular relates to a refrigeration system suitable for places with high per capita space occupancy. Background Art

[0002] In the hot summer, existing air conditioning and refrigeration technology cannot meet the operating environment requirements of construction workers in open spaces such as road and bridge construction, housing construction, and shipbuilding welding. For large factories such as chemical plants and pharmaceutical factories, the factory area is large, the per capita space occupancy rate is very high, and there are a large number of heat dissipation equipment in the factory. Using air conditioners to cool the factory will undoubtedly consume a lot of electricity costs. For factories with intermittent operation mode, in order to ensure a comfortable temperature inside the factory during operation time, the air conditioners must still be turned on for cooling during non-operating time, which is also a waste of electricity resources.

[0003] For example, a factory building with a volume of 10,000 m³ and a 10-meter-high floor height has a summer cooling demand of 1,000 W / m², resulting in a summer cooling load of 1,000 kW. Based on the air conditioning design and selection criteria, a 250-horsepower refrigeration unit is required, consuming approximately 187.5 kW of power. Based on an electricity rate of 1 yuan per kWh and a 10-hour operating day, the daily electricity cost for cooling the factory is 1,875 yuan. Furthermore, installing a refrigeration unit in a factory requires a high initial investment; if the factory is undergoing renovation, it can also disrupt normal production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to make up for the deficiencies of the prior art and provide a refrigeration system suitable for places with high per capita space occupancy.

[0005] To solve the above technical problems, the technical solution of the present invention is:

[0006] A refrigeration system suitable for places with high per capita space occupancy, characterized by comprising an energy storage module, a storage and transportation module and an energy storage service;

[0007] The energy storage module includes a refrigeration device, a cold plate assembly, and several flexible energy storage bags. The flexible energy storage bags are encapsulated with an inorganic salt phase change material with a phase change temperature of 22°C to 28°C. The refrigeration device is connected to the cold plate assembly and serves as a cooling source for the cold plate assembly. The cold plate assembly is used to transfer heat with the flexible energy storage bags, causing the inorganic salt phase change material in the flexible energy storage bags to cool and solidify.

[0008] The storage and transportation module is a thermal insulation container used to store flexible energy storage bags;

[0009] Energy storage clothing is a kind of work clothing. A plurality of placement pockets are provided on the side of the work clothing that fits the human body. The placement pockets are used to embed flexible energy storage bags.

[0010] Furthermore, the number of flexible energy storage bags used in the energy storage suit meets the following conditions:

[0011]

[0012] Wherein, n is the number of flexible energy storage bags (9) embedded in the energy storage suit; t is the working time; is the mass of the inorganic salt phase change material in the flexible energy storage bag (9); q is the liquid-solid phase change latent heat of the inorganic salt phase change material per unit mass.

[0013] Furthermore, the storage and transportation module is a polyurethane foam wrapped thermal insulation container or a vacuum insulation thermal insulation container.

[0014] Furthermore, the cold plate assembly includes an upper cold plate and a lower cold plate; the upper cold plate and the lower cold plate are fixedly connected by a number of fixing bolts and nuts, and the upper cold plate and the lower cold plate are used to clamp and directly exchange heat with the flexible energy storage bag; an upper flow channel is provided in the upper cold plate, and the upper flow channel includes an interface I and an interface P, and the interface I is connected to the liquid outlet of the refrigeration device through a pipeline; a lower flow channel is provided in the lower cold plate, and the lower flow channel includes an interface O and an interface Q, and the interface O is connected to the liquid return port of the refrigeration device through a pipeline, and the interface Q is connected to the interface P through a metal corrugated hose; the refrigeration device is a vapor compression refrigeration device.

[0015] Furthermore, in the cold plate assembly, a plurality of decompression springs are provided between the upper cold plate and the lower cold plate. When the upper cold plate and the lower cold plate clamp the flexible energy storage bag, the decompression springs are in a compressed state. The tightening torque M of a single fixing bolt satisfies the following conditions:

[0016]

[0017] Where M is the tightening torque of a single fixing bolt; P is the pressure on the upper surface of the flexible energy storage bag; A is the contact area between the cold plate assembly and the flexible energy storage bag; m is the mass of the upper cold plate; N is the total decompression force of the decompression spring; is the number of fixing bolts; d is the pitch diameter of the fixing bolt thread; R is the outer radius of the bearing surface of the nut; r is the inner radius of the bearing surface of the nut; f is the friction coefficient between the nut and the supporting surface of the connected part; is the pitch of the fixing bolt; β is the half angle of the thread of the fixing bolt.

[0018] Furthermore, the total decompression force N provided by the rebound of the decompression spring is greater than the mass m of the upper cold plate.

[0019] Furthermore, the cold plate assembly also includes a plurality of shelves arranged between the upper cold plate and the lower cold plate, the shelves are provided with a plurality of hollow spaces, the hollow spaces are used to assist in placing a single flexible energy storage bag, and the height of the shelves is lower than the thickness of the flexible energy storage bag.

[0020] Furthermore, a handle is provided at the front end of the shelf.

[0021] Furthermore, in the cold plate assembly, the upper cold plate and the lower cold plate are both made of copper plates.

[0022] Furthermore, in the cold plate assembly, the upper flow channel in the upper cold plate and the lower flow channel in the lower cold plate are laid rigid metal pipes or obtained by 3D printing, and the directions of the upper flow channel and the lower flow channel are both "snake-shaped".

[0023] The beneficial effects that can be achieved by the present invention are:

[0024] (1) The technical solution of the present invention is suitable for places with high per capita space occupancy, meeting the human body's cooling needs. Compared with the method of using air conditioning refrigeration, the power consumption is greatly reduced, and the initial investment cost is low. Taking a factory building with a volume of 10,000 m³ and a floor height of 10 meters as an example, assuming that there are 10 workers, the heat generated by the human body when doing light physical labor is about 140W, and the heat generated by the equipment is converted into human heat, which is converted to 200W / person, then the total cooling load is 2kW. The technical solution of the present invention does not require dehumidification. The best temperature felt by the human body in summer is about 25℃. The evaporation temperature can be selected as 23℃, which can greatly improve the energy efficiency ratio of the refrigeration system compared to the evaporation temperature of 5℃-7℃ of the air conditioning refrigeration system. The compressor of the refrigeration device is selected as 0.4HP. Based on the calculation that the workers work 10 hours a day, the energy storage module of the present invention consumes 3kW.h. Based on the electricity price of 1 yuan / kWh, the electricity cost of the energy storage module of the present invention is only 3 yuan.

[0025] (2) Compared with air conditioning refrigeration, the technical solution of the present invention has no restrictions on the use space or location.

[0026] (3) The technical solution of the present invention consumes no cooling energy during non-operation periods and is particularly suitable for environments with intermittent working modes.

[0027] (4) The technical solution of the present invention uses phase change energy storage materials to store cold, which is convenient for centralized refrigeration and also beneficial for peak-valley electricity staggered energy storage, thus greatly improving economic efficiency.

[0028] (5) The technical solution of the present invention selects phase change energy storage materials with specific evaporation temperature and specific phase change temperature through a refrigeration device, so that when the energy storage clothing is worn, the human body will not feel uncomfortable due to excessively low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the connection between the refrigeration device and the cold plate assembly in an embodiment of the present invention;

[0030] Figure 2 is a front view of a cold plate assembly according to an embodiment of the present invention;

[0031] Figure 3 is a top view of the upper cold plate in an embodiment of the present invention;

[0032] Figure 4 is a top view of the lower cold plate in an embodiment of the present invention;

[0033] Figure 5 is a top view of a shelf containing a flexible energy storage bag according to an embodiment of the present invention;

[0034] Figure 6 yes Figure 5 Side view of

[0035] Figure 7 yes Figure 2 A partial enlarged view of part A;

[0036] In the figure: 1- compressor, 2- oil separator, 3- condenser, 4- drying filter, 5- expansion valve, 6- cold plate assembly, 61- upper cold plate, 62- lower cold plate, 63- upper flow channel, 64- lower flow channel, 7- metal corrugated hose, 8- shelf, 9- flexible energy storage bag, 10- fixing bolt, 11- decompression spring, 12- nut. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0038] A refrigeration system suitable for places with high per capita space occupancy rate includes an energy storage module, a storage and transportation module and an energy storage service.

[0039] The energy storage module includes a refrigeration device, a cold plate assembly 6 and a plurality of flexible energy storage bags 9 .

[0040] The flexible energy storage bag 9 is encapsulated with an inorganic salt phase change material, that is, the flexible energy storage bag 9 is a combination of a plastic bag encapsulating an inorganic salt phase change material, and the phase change temperature of the inorganic salt phase change material is about 25°C.

[0041] like Figure 1 As shown, the refrigeration device includes a compressor 1, an oil separator 2, a condenser 3, a drying filter 4 and an expansion valve 5. Since the refrigeration device belongs to the prior art, the specific structure of the refrigeration device will not be described here; the refrigeration device includes a liquid outlet and a liquid return port for the refrigeration liquid, and the refrigeration device is connected to the cold plate assembly 6 and is used as a refrigeration source for the cold plate assembly 6; the cold plate assembly 6 is used to transfer heat with the flexible energy storage bag 9, so that the inorganic salt phase change material in the flexible energy storage bag 9 is cooled and changes to a solid state.

[0042] like Figure 2-Figure 4As shown, the cold plate assembly 6 includes an upper cold plate 61 and a lower cold plate 62. The upper cold plate 61 and the lower cold plate 62 are both rectangular plates, and the materials used are copper plates with good thermal conductivity. The upper cold plate 61 and the lower cold plate 62 are fixedly connected by four fixing bolts 10 and nuts 12, and the four fixing bolts 10 and nuts 12 are distributed near the four corners of the upper cold plate 61 and the lower cold plate 62. The upper cold plate 61 and the lower cold plate 62 are used to clamp and directly exchange heat with the flexible energy storage bag 9. An upper flow channel 63 is provided in the upper cold plate 61, and the upper flow channel 63 includes an interface I and an interface P. The interface I is connected to the liquid outlet of the refrigeration device through a pipeline; a lower flow channel 64 is provided in the lower cold plate 62, and the lower flow channel 64 includes an interface O and an interface Q. The interface O is connected to the return liquid port of the refrigeration device through a pipeline, and the interface Q is connected to the interface P through a metal corrugated hose 7; the upper flow channel 63 and the lower flow channel 64 can be laid flexible pipes, and can also be obtained by 3D printing the upper flow channel 63 and the lower flow channel 64; the refrigeration device is a vapor compression refrigeration device.

[0043] The upper cold plate 61 needs to be lifted to put in and take out the flexible energy storage bag 9. Since the upper cold plate 61 filled with refrigerant is heavy, a number of decompression springs 11 are provided between the upper cold plate 61 and the lower cold plate 62. When the upper cold plate 61 and the lower cold plate 62 clamp the flexible energy storage bag 9, the decompression springs 11 are in a compressed state; when the fixing bolts 10 are loosened, the decompression springs 11 will naturally rebound, thereby lifting the upper cold plate 61. The total decompression pressure N provided by the rebound of the decompression springs 11 is greater than the mass m of the upper cold plate 61.

[0044] The tightening torque M of a single fixing bolt 10 satisfies the following conditions:

[0045]

[0046] Wherein, M is the tightening torque of a single fixing bolt 10; P is the pressure on the upper surface of the flexible energy storage bag 9; A is the contact area between the cold plate assembly 6 and the flexible energy storage bag 9; m is the mass of the upper cold plate 61; N is the total decompression force of the decompression spring 11; is the number of fixing bolts 10; d is the pitch diameter of the thread of the fixing bolt 10; R is the outer radius of the bearing surface of the nut 12; r is the inner radius of the bearing surface of the nut 12; f is the friction coefficient between the nut 12 and the supporting surface of the connected part; is the pitch of the fixing bolt 10; β is the thread half angle of the fixing bolt 10.

[0047] In order to facilitate the placement and removal of the flexible energy storage bag 9, a plurality of shelves 8 are provided between the upper cold plate 61 and the lower cold plate 62, such as Figure 5 As shown, the shelf 8 is provided with a plurality of hollow spaces, which are used to assist in placing a single flexible energy storage bag 9. The height of the shelf 8 is lower than the thickness of the flexible energy storage bag 9. Figure 6 shown.

[0048] In order to facilitate pulling out / pushing the shelf 8 between the upper cold plate 61 and the lower cold plate 62 , a handle is provided at the front end of the shelf 8 .

[0049] The storage and transportation module is a heat-insulating container for storing the flexible energy storage bag 9. The storage and transportation module can be a polyurethane foam-wrapped heat-insulating container or a vacuum-insulated heat-insulating container.

[0050] The energy storage suit is a work suit. On the side of the work suit that fits the human body, there are several placement pockets. The placement pockets are used to embed flexible energy storage bags 9. The number of flexible energy storage bags 9 used in the energy storage suit meets the following conditions:

[0051]

[0052] Wherein, n is the number of flexible energy storage bags 9 embedded in the energy storage suit; t is the working time; is the mass of the inorganic salt phase change material in the flexible energy storage bag 9; q is the liquid-solid phase change latent heat per unit mass of the inorganic salt phase change material.

[0053] Use of this embodiment:

[0054] (1) Tighten the nut 12 screwed on the fixing bolt 10 so that the upper cold plate 61 is lifted under the action of the decompression spring 11, manually pull out the shelf 8, leaving a hollow space between the upper cold plate 61 and the lower cold plate 62, put the flexible energy storage bag 9 into the hollow space, and then push the shelf 8 a little. Referring to the same operation, put the flexible energy storage bag 9 into the hollow spaces of the shelf 8 one by one until all the hollow spaces of the shelf 8 are placed between the upper cold plate 61 and the lower cold plate 62, tighten the nut 12 screwed on the fixing bolt 10 according to the tightening torque requirements, and the cold plate is pressed against the flexible energy storage bag 9 by the specific torque of the fixing bolt 10, which is beneficial to the heat exchange between the cold plate and the phase change energy storage material. The theoretical basis is: when two objects of different temperatures come into contact, the contact thermal resistance between the objects is inversely proportional to the contact pressure. The greater the contact pressure, the smaller the contact thermal resistance, and vice versa.

[0055] (2) Start the refrigeration device to cool the inorganic salt phase change material in the flexible energy storage bag 9 to the required temperature.

[0056] (3) Tighten the nut 12 screwed on the fixing bolt 10 to lift the upper cold plate 61 under the action of the decompression spring 11, manually pull out the shelf 8 step by step, take out the flexible energy storage bags 9 one by one, and put the flexible energy storage bags 9 into the storage and transportation module, and transport the flexible energy storage bags 9 to the required location through the storage and transportation module.

[0057] (4) Take out the flexible energy storage bag 9 from the storage and transportation module, and embed the flexible energy storage bag 9 into the placement bag on the side of the work clothes that fits the human body. The staff can cool down by wearing the work clothes containing the flexible energy storage bag 9. After the work is completed, the flexible energy storage bag 9 is recycled and reused.

[0058] In the description of the present invention, words indicating directions or positional relationships, such as “inside”, “outside”, “upper”, “lower”, “front” and “back”, are only used to facilitate the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0059] The above is only one embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications made without departing from the concept of the present invention are all within the protection scope of the present invention.

Claims

1. A refrigeration system suitable for places with high per capita space occupancy, characterized by: Including energy storage modules, storage and transportation modules and energy storage services; The energy storage module includes a refrigeration device, a cold plate assembly (6) and a plurality of flexible energy storage bags (9), wherein the flexible energy storage bags (9) are encapsulated with an inorganic salt phase change material, and the phase change temperature of the inorganic salt phase change material is 22°C to 28°C; the refrigeration device is connected to the cold plate assembly (6) and is used as a cooling source for the cold plate assembly (6); the cold plate assembly (6) is used to transfer heat with the flexible energy storage bag (9), so that the inorganic salt phase change material in the flexible energy storage bag (9) is cooled and changes to a solid state; The storage and transportation module is a heat-insulating container for storing the flexible energy storage bag (9); The energy storage suit is a work suit, and a plurality of placement pockets are provided on the side of the work suit that fits the human body, and the placement pockets are used to embed flexible energy storage bags (9); The storage and transportation module is a polyurethane foam wrapped thermal insulation container or a vacuum insulation thermal insulation container; The cold plate assembly (6) includes an upper cold plate (61) and a lower cold plate (62); the upper cold plate (61) and the lower cold plate (62) are fixedly connected by a plurality of fixing bolts (10) and nuts (12); the upper cold plate (61) and the lower cold plate (62) are used to clamp and directly exchange heat with the flexible energy storage bag (9); an upper flow channel (63) is provided in the upper cold plate (61), the upper flow channel (63) includes an interface I and an interface P, and the interface I is connected to the liquid outlet of the refrigeration device through a metal corrugated hose (7); a lower flow channel (64) is provided in the lower cold plate (62), the lower flow channel (64) includes an interface O and an interface Q, the interface O is connected to the liquid return port of the refrigeration device through a metal corrugated hose (7), and the interface Q is connected to the interface P through the metal corrugated hose (7); the refrigeration device is a vapor compression refrigeration device; In the cold plate assembly (6), a plurality of decompression springs (11) are provided between the upper cold plate (61) and the lower cold plate (62). When the upper cold plate (61) and the lower cold plate (62) clamp the flexible energy storage bag (9), the decompression springs (11) are in a compressed state. The tightening torque M of a single fixing bolt (10) satisfies the following conditions: ； Wherein, M is the tightening torque of a single fixing bolt (10); P is the pressure on the upper surface of the flexible energy storage bag (9); A is the contact area between the cold plate assembly (6) and the flexible energy storage bag (9); m is the mass of the upper cold plate (61); N is the total decompression pressure of the decompression spring (11); is the number of fixing bolts (10); d is the thread pitch diameter of the fixing bolt (10); R is the outer radius of the bearing surface of the nut (12); r is the inner radius of the bearing surface of the nut (12); f is the friction coefficient between the nut (12) and the supporting surface of the connected part; is the pitch of the fixing bolt (10); β is the half angle of the thread of the fixing bolt (10).

2. The refrigeration system for places with high per capita space occupancy according to claim 1 is characterized by: The number of flexible energy storage bags (9) used in conjunction with the energy storage suit satisfies the following conditions: Wherein, n is the number of flexible energy storage bags (9) embedded in the energy storage suit; t is the working time; is the mass of the inorganic salt phase change material in the flexible energy storage bag (9); q is the liquid-solid phase change latent heat of the inorganic salt phase change material per unit mass.

3. The refrigeration system for places with high per capita space occupancy according to claim 1 is characterized by: The total decompression pressure N provided by the rebound of the decompression spring (11) is greater than the gravity of the upper cold plate (61).

4. The refrigeration system for places with high per capita space occupancy according to claim 1 is characterized by: The cold plate assembly (6) further comprises a plurality of shelves (8) arranged between the upper cold plate (61) and the lower cold plate (62), wherein the shelves (8) are provided with a plurality of hollow spaces, the hollow spaces being used to assist in placing a single flexible energy storage bag (9), and the height of the shelves (8) is lower than the thickness of the flexible energy storage bag (9).

5. The refrigeration system for places with high per capita space occupancy according to claim 4 is characterized by: The front end of the shelf (8) is provided with a handle.

6. The refrigeration system for places with high per capita space occupancy according to claim 1 is characterized by: In the cold plate assembly (6), the upper cold plate (61) and the lower cold plate (62) are both made of copper plates.

7. The refrigeration system for places with high per capita space occupancy according to claim 1 is characterized by: In the cold plate assembly (6), the upper flow channel (63) in the upper cold plate (61) and the lower flow channel (64) in the lower cold plate (62) are laid rigid metal pipes or obtained by 3D printing, and the directions of the upper flow channel (63) and the lower flow channel (64) are both "snake-shaped".

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