Electric cold storage type cold air supply device

Abstract

The embodiment of the present invention provides an electric cold storage type cold air supply device, which relates to the field of thermal energy technology. It includes a heat preservation cavity, a vapor compression refrigerator, a low-grade heat collector, a heat energy driven refrigerator, a heat exchanger and a cold storage medium built into the heat preservation cavity. The heat preservation cavity is provided with an air inlet and an air outlet. The refrigerator with a higher cold source temperature among the heat energy driven refrigerator and the vapor compression refrigerator is installed at the air inlet. The vapor compression refrigerator is installed on the air inlet side of the cold storage medium and is thermally connected to the cold storage medium. The low-grade heat collector is installed outside the heat preservation cavity and is connected to the hot end of the heat energy driven refrigerator. The heat exchanger is located in the heat preservation cavity. The heat exchanger is thermally connected to the refrigerator with a lower cold source temperature among the heat energy driven refrigerator and the vapor compression refrigerator. The electric cold storage type cold air supply device is equipped with a vapor compression refrigerator, and the low-grade heat collector continuously operates to collect heat for cooling, thereby reducing power consumption.

Description

Technical Field

[0001] The invention relates to the field of thermal energy technology, and in particular to an electric cold storage type cold air supply device. Background Art

[0002] With the rapid development of the power industry, more and more power station systems have emerged in China. The load is reduced during the off-peak period, resulting in a large amount of surplus off-peak electricity. The characteristics of power products are that production, supply and sales are completed at the same time. The large amount of surplus off-peak electricity leads to the waste of power resources, which is not conducive to energy conservation and environmental protection. For this reason, different electricity prices are used for off-peak electricity and peak electricity to urge people to use electricity at off-peak times, improve energy utilization and reduce waste.

[0003] In the hot summer, we need to provide cooling air to lower the indoor temperature. Various refrigeration equipment is also used in industrial production to provide the required production temperature. The traditional way is to use air conditioning to cool down. However, air conditioning is directly driven by electricity, which consumes a lot of electricity and wastes resources seriously. In recent years, some steam compression electric cold storage equipment has emerged, which converts cheap off-peak electricity (usually at night) into cold energy through refrigerators and stores it in cold storage media; during the peak electricity stage with the highest price (usually during the day), the room temperature air is exchanged with the cold storage medium to become low-temperature air and supplied to users, thereby reducing the electricity cost of refrigeration. However, the entire equipment relies solely on electricity in the process of storing electricity, consumes a lot of electricity, and the cooling cost is still high. Summary of the invention

[0004] The embodiment of the present invention provides an electric cold storage type cold air supply device, which is used to solve the defect of high cooling cost in the prior art and reduce the power consumption.

[0005] An embodiment of the present invention provides an electric cold storage type cold air supply device, comprising a heat preservation cavity, a vapor compression refrigerator, a low-grade heat collector, a heat energy driven refrigerator, a heat exchanger and a cold storage medium built into the heat preservation cavity, the heat preservation cavity is provided with an air inlet and an air outlet, the heat energy driven refrigerator and the vapor compression refrigerator having a higher cold source temperature are installed at the air inlet, the vapor compression refrigerator is installed on the air inlet side of the cold storage medium and is thermally connected to the cold storage medium, the low-grade heat collector is installed outside the heat preservation cavity and is connected to the hot end of the heat energy driven refrigerator, the heat exchanger is located in the heat preservation cavity, and the heat exchanger is thermally connected to the heat energy driven refrigerator and the vapor compression refrigerator having a lower cold source temperature.

[0006] According to an electric cold storage type cold air supply device of one embodiment of the present invention, the vapor compression refrigerator includes a condenser, a compressor, an evaporator and a throttle valve connected in sequence, the thermal energy driven refrigerator is installed at the air inlet, the evaporator is installed in the heat preservation cavity and is located above the thermal energy driven refrigerator, the heat exchanger is thermally connected to the evaporator, and an insulating material is provided between the heat exchanger and the cold end of the thermal energy driven refrigerator.

[0007] According to an electric cold storage type cold air supply device of one embodiment of the present invention, the vapor compression refrigerator is installed at the air inlet, the heat exchanger is thermally connected to the cold end of the thermal energy driven refrigerator, and the heat exchanger is arranged on the air inlet side or the air outlet side of the cold storage medium. When the heat exchanger is arranged on the air inlet side of the cold storage medium, an insulating material is arranged between the condenser of the vapor compression refrigerator and the heat exchanger.

[0008] According to the electric cold storage type cold air supply device of one embodiment of the present invention, the heat energy driven refrigerator is a Villemire type refrigerator.

[0009] According to an electric cold storage type cold air supply device of one embodiment of the present invention, the Villemire type refrigerator includes a low-temperature chamber, a medium-temperature chamber and a high-temperature chamber connected in sequence, the high-temperature chamber is thermally connected to the low-grade heat collector, and the low-temperature chamber is arranged in the insulation chamber and thermally connected to the heat exchanger.

[0010] According to an electric cold storage type cold air supply device of one embodiment of the present invention, the heat preservation cavity includes an outer wall and an inner wall, the outer wall is located outside the inner wall, and the accommodating space formed by connecting the inner wall and the outer wall is filled with heat preservation material.

[0011] According to an electric cold storage type cold air supply device of one embodiment of the present invention, the cold storage medium is a ball, a wire mesh or a block structure made of phase change heat storage material or any one of stainless steel, copper and lead.

[0012] According to the electric cold storage type cold air supply device of one embodiment of the present invention, the cold storage medium divides the heat preservation cavity into a left chamber and a right chamber, and the air inlet and the air outlet are respectively arranged in the left chamber and the right chamber.

[0013] According to the electric cold storage type cold air supply device of one embodiment of the present invention, a base is fixedly installed in the heat preservation cavity, and the cold storage medium is stacked on the base.

[0014] According to an electric cold storage type cold air supply device of one embodiment of the present invention, the air inlet is located at the bottom of the heat preservation cavity and is arranged toward the base, and the air outlet is located at the air outlet side of the cold storage medium and is arranged corresponding to the base.

[0015] An electric cold storage type cold air supply device provided in an embodiment of the present invention includes a vapor compression refrigerator, which provides cooling during off-peak electricity periods and stops working during peak electricity periods to be cooled by a cold storage medium, thereby saving electricity costs; the electric cold storage type cold air supply device is also equipped with a low-grade heat collector and a heat-driven refrigerator, which continuously collects low-grade heat such as solar energy and industrial waste heat for cooling, thereby further reducing the power consumption of the vapor compression refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of an electric cold storage type cold air supply device provided when the cold source temperature of a heat energy driven refrigerator is lower than that of a vapor compression refrigerator according to an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of another electric cold storage type cold air supply device provided when the cold source temperature of the heat energy driven refrigerator is lower than that of the vapor compression refrigerator according to an embodiment of the present invention;

[0019] Figure 3 It is a structural schematic diagram of an electric cold storage type cold air supply device provided when the cold source temperature of a heat energy driven refrigerator is higher than that of a vapor compression refrigerator according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 10. Insulation cavity; 11. Air inlet; 12. Air outlet; 13. Outer wall; 14. Inner wall; 15. Insulation material; 20. Vapor compression refrigerator; 21. Evaporator; 22. Throttle valve; 23. Condenser; 24. Compressor; 30. Cold storage medium; 40. Low-grade heat collector; 50. Heat exchanger; 60. Thermal energy driven refrigerator; 61. Low-temperature cavity; 62. Medium-temperature cavity; 63. High-temperature cavity; 70. Insulation material; 80. Base. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are for the purpose of clearly describing the numbering of product components and do not represent any substantial difference. The directions of "up", "down", "left" and "right" are all based on the directions shown in the accompanying drawings. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] Combine the following Figures 1 to 3 The structure of the electric cold storage type cold air supply device according to the embodiment of the present invention is described.

[0025] like Figures 1 to 3 As shown, the electric cold storage type cold air supply device provided by the embodiment of the present invention includes a heat preservation cavity 10, a vapor compression refrigerator 20, a cold storage medium 30, a low-grade heat collector 40, a heat exchanger 50 and a heat energy driven refrigerator 60. The heat preservation cavity 10 is provided with an air inlet 11 and an air outlet 12, and the refrigerator with a higher cold source temperature among the vapor compression refrigerator 20 and the heat energy driven refrigerator 60 is installed at the air inlet 11. The cold storage medium 30 is built into the heat preservation cavity 10 and is located on the air inlet side of the cold storage medium 30, and the vapor compression refrigerator 20 is thermally connected to the cold storage medium 30. The low-grade heat collector 40 is located outside the heat preservation cavity 10, and the low-grade heat collector 40 is connected to the hot end of the heat energy driven refrigerator 60. The heat exchanger 50 is located in the heat preservation cavity 10, and the heat exchanger 50 is thermally connected to the refrigerator with a lower cold source temperature among the vapor compression refrigerator 20 and the heat energy driven refrigerator 60. The external air enters from the air inlet 11 and is initially cooled by the refrigerator with a higher cold source temperature, and then further cooled by the refrigerator with a lower cold source temperature through the heat exchanger 50. The air temperature is gradually reduced, and the utilization rate of heat is improved. The cooled air is discharged from the air outlet 12. Among them, the vapor compression refrigerator 20 operates in the off-peak power stage and stops operating in the peak power stage. The low-grade heat collector 40 absorbs external solar energy or waste heat.

[0026] When in use, in the off-peak electricity stage, the vapor compression refrigerator 20 and the heat-driven refrigerator 60 are started, and the low-grade heat collector 40 is in working state. The air entering from the air inlet 11 is initially cooled by the refrigerator with a higher cold source temperature, and then cooled again by the heat exchanger 50 under the action of the refrigerator with a lower cold source temperature and supplied to the user. During the air flow, part of the cold energy is transferred to the cold storage medium 30 for storage. In the peak electricity stage, the vapor compression refrigerator 20 stops working, and the heat-driven refrigerator 60 and the low-grade heat collector 40 continue to work. When the cold source temperature of the heat-driven refrigerator 60 is low, the external air is discharged after passing through the vapor compression refrigerator 20, the heat exchanger 50 and the cold storage medium 30; when the cold source temperature of the heat-driven refrigerator is high, the external air is discharged after passing through the heat-driven refrigerator 60, the heat exchanger 50 and the cold storage medium 30. In this way, the off-peak electricity is used to store energy, improve the utilization rate of electric energy and reduce costs. It should be noted that, during the peak electricity phase, the vapor compression refrigerator 20 may continue to operate, depending on the actual working conditions.

[0027] The electric cold storage type cold air supply device provided in the embodiment of the present invention includes a vapor compression refrigerator 20 and a thermal energy driven refrigerator 60. A refrigerator with a low cold source temperature is installed at the air inlet 11 to preliminarily cool the air; the vapor compression refrigerator 20 performs cooling during the off-peak power stage, and stops working during the peak power stage to be cooled by the cold storage medium 30, thereby saving electricity costs; the electric cold storage type cold air supply device is also equipped with a low-grade heat collector 40 to continuously collect low-grade heat such as solar energy and industrial waste heat for cooling, thereby further reducing the power consumption of the vapor compression refrigerator 20; the thermal energy driven refrigerator 60 does not require electric energy to drive, thereby further reducing power consumption.

[0028] The vapor compression refrigerator 20 includes an evaporator 21, a throttle valve 22, a condenser 23 and a compressor 24 connected in sequence. Figure 1-3 As shown, the condenser 23 is located inside the heat preservation cavity 10, and the evaporator 21, the throttle valve 22 and the compressor 24 are all located outside the heat preservation cavity 10. Among them, the evaporator 21, the throttle valve 22, the condenser 23 and the compressor 24 are sequentially connected through connecting pipes. The connecting pipe connecting the evaporator 21 and the compressor 24 passes through the wall of the heat preservation cavity 10, and the connecting pipe connecting the evaporator 21 and the throttle valve 22 also passes through the wall of the heat preservation cavity 10, and the air inlet 11 is set in the area between the two connecting pipes.

[0029] like Figure 1 and Figure 2As shown, when the cold source temperature of the heat energy driven refrigerator 60 is lower than the cold source temperature of the vapor compression refrigerator 20, the vapor compression refrigerator 20 is installed at the air inlet 11, and the heat exchanger 50 is thermally connected to the cold end of the heat energy driven refrigerator 60. The heat exchanger 50 can be installed on the air outlet side of the cold storage medium 30 or on the air inlet side of the cold storage medium 30. Figure 1 As shown, the heat exchanger 50 is installed on the air inlet side of the cold storage medium 30, the heat energy driven refrigerator 60 is installed on the top of the heat exchanger 50, and the air inlet 11 is set below the vapor compression refrigerator 20. In the off-peak phase, the external air enters and first passes through the vapor compression refrigerator 20, and then exchanges heat with the heat exchanger 50, so as to achieve step-by-step cooling and improve the heat utilization rate. Figure 1 As shown, the heat exchanger 50 and the vapor compression refrigerator 20 are located on the same side of the cold storage medium 30. In order to avoid irreversible loss caused by heat transfer between the heat exchanger 50 and the evaporator 21 of the vapor compression refrigerator 20, a heat insulation material 70 is placed between the cold end of the vapor compression refrigerator 20, that is, the evaporator 21 and the heat exchanger 50. The heat insulation material 70 is made of heat-insulating materials such as glass wool or rock wool. Figure 2 As shown, the heat exchanger 50 is installed on the outlet side of the cold storage medium 30, and it is located on a different side of the cold storage medium 30 from the vapor compression refrigerator 20. In this case, there is no need to set the heat insulation material 70. During the off-peak period, the outside air enters and passes through the vapor compression refrigerator 20 for preliminary cooling, and then passes through the cold storage medium 30 and the heat exchanger 50 in sequence before being discharged from the air outlet 12.

[0030] When the cold source temperature of the heat energy driven refrigerator 60 is higher than the cold source temperature of the vapor compression refrigerator 20, as shown in FIG. Figure 3 As shown, the air inlet 11 is arranged below the cold end of the heat-driven refrigerator 60, such as below the low-temperature chamber of the Villemire refrigerator; the evaporator 21 of the vapor compression refrigerator 20 is thermally connected to the heat exchanger 50, and a heat insulating material 70 is arranged between the heat exchanger 50 and the cold end of the heat-driven refrigerator 60, and the heat insulating material 70 is made of heat-insulating materials such as glass wool or rock wool. After entering, the external air first passes through the low-temperature chamber of the Villemire refrigerator for preliminary cooling and then passes through the heat exchanger 50 for further cooling.

[0031] In the embodiment of the present invention, the heat energy driven refrigerator 60 adopts a Villemire refrigerator, for example, it can be a Villemire refrigerator, it can also be a Villemire pulse tube refrigerator, or it can be a combination of the two. Specifically, the Villemire refrigerator includes a low temperature chamber 61, a medium temperature chamber 62 and a high temperature chamber 63 connected in sequence. The low temperature chamber 61 is located in the heat preservation chamber 10 and is connected to the heat exchanger 50, and the high temperature chamber 63 is located outside the heat preservation chamber 10 and is connected to the low-grade heat collector 40. The low-grade heat collector 40 collects low-grade heat such as industrial waste heat and solar energy, and transfers it to the heat exchanger 50 through the Villemire refrigerator to provide cooling for the air.

[0032] The heat preservation cavity 10 includes an outer wall 13 and an inner wall 14. The outer wall 13 is located outside the inner wall 14. The accommodation space formed between the inner wall 14 and the outer wall 13 is filled with heat preservation material 15. Figure 1 As shown, the inner wall 14 and the outer wall 13 are connected to each other and form a certain accommodation space between the two. The accommodation space is filled with a heat-insulating material 15 to prevent heat from diffusing outward and improve the utilization rate of heat energy. The heat-insulating material 15 can be any one or a combination of multiple types of polyester foam, glass wool and rock wool, which is not specifically limited in the embodiment of the present invention.

[0033] In an embodiment of the present invention, the cold storage medium 30 can be a ball, mesh or block structure made of phase change heat storage material or solid materials such as stainless steel, copper, lead, etc., with high heat storage density. For example, the cold storage medium 30 is formed by stacking multiple stainless steel blocks. For another example, the cold storage medium 30 uses high-temperature molten salt, and the high-temperature molten salt is stored in a shell-like structure. Of course, the cold storage medium 30 can also use thermochemical heat storage materials or adsorption heat storage materials.

[0034] like Figure 1 As shown, the cold storage medium 30 divides the heat preservation cavity 10 into a left cavity and a right cavity, and the air inlet 11 and the air outlet 12 are arranged in the left cavity and the right cavity respectively, so as to ensure that the air entering the heat preservation cavity 10 passes through the cold storage medium 30 before being discharged to fully absorb heat. For example, the air inlet 11 can be arranged in the left cavity, and correspondingly, the air outlet 12 is arranged in the right cavity; for another example, the air inlet 11 is arranged in the right cavity, and the air outlet 12 is arranged in the left cavity. The vapor compression refrigerator 20 is installed at the air inlet 11 to ensure that the external air first passes through the condenser 23 for preliminary heating after entering, and then passes through the cold storage medium 30 and the heat exchanger 50 to be heated to the required heating temperature, thereby improving the heat utilization rate and the air heating effect. Specifically, the size of the left cavity and the right cavity can be the same or different, and the distinction between left and right is only used to distinguish the two cavities without any orientation limitation. After entering from the air inlet 11 , the external air flows from one chamber to the other chamber, and absorbs heat through the cold storage medium 30 during the flow process and is converted into high-temperature air.

[0035] Specifically, Figure 1 As shown, a base 80 is fixedly installed in the heat preservation cavity 10, and the cold storage medium 30 is arranged on the base 80. The cold storage medium 30 is connected to the base 80, and the heat preservation cavity 10 is divided into two chambers. A certain gap is left between the cold storage medium 30 and the top of the heat preservation cavity 10 for the cold storage medium 30 to expand and contract with heat.

[0036] In the embodiment of the present invention, the air inlet 11 is located at the bottom of the heat preservation cavity 10, and the air outlet 12 is arranged corresponding to the base 80. An air inlet fan can be installed at the air inlet 11, and an air outlet fan can be installed at the air outlet 12. The air entering the air inlet 11 flows upward from the bottom, passes through the evaporator 21 and the cold storage medium 30 in sequence, and is dispersed from the air outlet 12 located on the other side of the cold storage medium 30. The air outlet 12 is arranged corresponding to the base 80, so that the cold air after passing through the cold storage medium 30 is fully mixed before being discharged to avoid uneven air temperature.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric cold storage type cold air supply device, characterized in that: The invention comprises a heat preservation cavity, a vapor compression refrigerator, a low-grade heat collector, a heat-driven refrigerator, a heat exchanger and a cold storage medium built in the heat preservation cavity, wherein the heat preservation cavity is provided with an air inlet and an air outlet, wherein the heat-driven refrigerator and the vapor compression refrigerator, whichever refrigerator has a higher cold source temperature, are installed at the air inlet, wherein the vapor compression refrigerator is installed at the air inlet side of the cold storage medium and is thermally connected to the cold storage medium, wherein the low-grade heat collector is installed outside the heat preservation cavity and is connected to the hot end of the heat-driven refrigerator, wherein the heat exchanger is located in the heat preservation cavity, wherein the heat exchanger is thermally connected to the heat-driven refrigerator and the refrigerator with a lower cold source temperature among the vapor compression refrigerators; The heat energy driven refrigerator is a Villemire type refrigerator; The Villemire type refrigerator comprises a low temperature chamber, a medium temperature chamber and a high temperature chamber which are connected in sequence, the high temperature chamber is thermally connected to the low-grade heat collector, and the low temperature chamber is arranged in the heat preservation chamber and is thermally connected to the heat exchanger; The heat preservation cavity comprises an outer wall and an inner wall, wherein the outer wall is located outside the inner wall, and a holding space formed by connecting the inner wall and the outer wall is filled with heat preservation material; The cold storage medium divides the heat preservation cavity into a left chamber and a right chamber, and the air inlet and the air outlet are arranged in the left chamber and the right chamber respectively.

2. The electric cold storage type cold air supply device according to claim 1, characterized in that: The vapor compression refrigerator comprises a condenser, a compressor, an evaporator and a throttle valve connected in sequence, the heat energy driven refrigerator is installed at the air inlet, the evaporator is installed in the heat preservation cavity and is located above the heat energy driven refrigerator, the heat exchanger is thermally connected to the evaporator, and an insulating material is provided between the heat exchanger and the cold end of the heat energy driven refrigerator.

3. The electric cold storage type cold air supply device according to claim 1, characterized in that: The vapor compression refrigerator is installed at the air inlet, the heat exchanger is thermally connected to the cold end of the thermal energy driven refrigerator, and the heat exchanger is arranged on the air inlet side or the air outlet side of the cold storage medium. When the heat exchanger is arranged on the air inlet side of the cold storage medium, an insulating material is arranged between the condenser of the vapor compression refrigerator and the heat exchanger.

4. The electric cold storage type cold air supply device according to any one of claims 1 to 3, characterized in that: The cold storage medium is a ball, a wire mesh or a block structure made of phase change heat storage material or any metal such as stainless steel, copper or lead.

5. The electric cold storage type cold air supply device according to any one of claims 1 to 3, characterized in that: A base is fixedly installed in the heat preservation cavity, and the cold storage medium is stacked on the base.

6. The electric cold storage type cold air supply device according to claim 5, characterized in that: The air inlet is located at the bottom of the heat preservation cavity and is arranged toward the base, and the air outlet is located at the air outlet side of the cold storage medium and is arranged corresponding to the base.

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