Asymmetric silk screen loop traveling wave thermoacoustic refrigerating system

Abstract

The invention discloses an asymmetric silk screen loop traveling wave thermo-acoustic refrigerating system which comprises four thermo-acoustic nuclear elements and four thermal buffer pipes, the four thermo-acoustic nuclear elements and the four thermal buffer pipes are alternately connected to form an annular loop, the annular loop is filled with working medium gas, one thermo-acoustic nuclear element serves as a thermo-acoustic engine, and the other thermo-acoustic nuclear element serves as a thermo-acoustic engine. The thermoacoustic core elements serve as thermoacoustic core elements and absorb heat energy and convert the heat energy into sound wave energy, the other three thermoacoustic core elements serve as thermoacoustic refrigerating machines and absorb the sound wave energy to refrigerate, heat regenerators are arranged in the thermoacoustic core elements, and filler bodies in the heat regenerators are silk screen filler formed by stacking a plurality of layers of fine silk screens. The four thermo-acoustic nuclear elements are located at four pure traveling wave sites in typical sound field distribution respectively, three thermo-acoustic refrigerators are driven by one thermo-acoustic engine, and filler bodies of the thermo-acoustic engine and the thermo-acoustic refrigerators are formed by stacking fine wire meshes. And meanwhile, the four thermoacoustic nuclear elements are respectively arranged at four pure traveling wave sites in typical sound field distribution, so that the refrigeration efficiency of the whole machine is high.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration, and in particular relates to an asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system. Background Art

[0002] At present, most traveling wave thermoacoustic refrigeration systems adopt a four-stage structure, mainly because of its neat structure and good cooling effect. Document No. WO2010107308A1 discloses a four-stage traveling wave thermoacoustic refrigeration system, but its four thermoacoustic core elements are connected into a circuit structure through a resonance tube, and each thermoacoustic core element includes a heater, a room temperature end heat exchanger and a regenerator. The diameter of the resonance tube used in the four-stage traveling wave thermoacoustic refrigeration system is much smaller than that of the traditional thermoacoustic engine, which effectively avoids the problems such as the reduction of power density caused by the excessive volume of the resonance tube. However, the heat buffer tube and other components are not added to the loop system, which easily leads to the loss of cold and hot gas mixing and a large amount of heat loss in the resonance tube. In addition, the thermal power generated by the thermoacoustic engine is much greater than the consumption of acoustic power by the thermoacoustic refrigerator. The phase between the output port of the thermoacoustic engine and the input port of the thermoacoustic refrigerator is adjusted by introducing a resonance tube, which increases the loss of acoustic power. The matching of the two by consuming acoustic power will limit the efficiency improvement of the whole machine. Document number CN108180673B "A loop heat-driven thermoacoustic refrigeration system" discloses a loop heat-driven refrigeration system, which uses a thermoacoustic engine to drive two thermoacoustic refrigerators to increase the consumption of the acoustic work generated by the thermoacoustic engine, thereby improving the efficiency of the whole machine. The COP ratio of the cooling capacity to the heating capacity of the whole machine in this system is 0.68, which is still not very ideal. Summary of the invention

[0003] In order to solve the above technical problems, the object of the present invention is to provide an asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system with simple structure, high overall efficiency and low energy consumption.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: an asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system, comprising four thermoacoustic core elements and four thermal buffer tubes, the four thermoacoustic core elements and the four thermal buffer tubes are alternately connected to form a ring loop, the ring loop is filled with a working fluid gas, one of the thermoacoustic core elements is used as a thermoacoustic engine, which is used to absorb thermal energy and convert it into sound wave energy, and the remaining three thermoacoustic core elements are used as thermoacoustic refrigerators, which are used to absorb sound wave energy for cooling, the thermoacoustic core element has a regenerator, and the filler body in the regenerator is a wire mesh filler formed by stacking multiple layers of fine wire mesh, and the four thermoacoustic core elements are respectively located at four pure traveling wave sites in a typical sound field distribution.

[0005] The beneficial effect of the above technical solution is that: by using one thermoacoustic engine to drive three thermoacoustic refrigerators, and the filler bodies of the thermoacoustic engine and the thermoacoustic refrigerator are both made of stacked fine wire mesh, and at the same time, the four thermoacoustic core elements are respectively located at four pure traveling wave sites in the typical sound field distribution, so that the refrigeration efficiency is high.

[0006] The filler body in the above technical solution meets at least one of the following conditions:

[0007] A: The volume porosity of the filler body is 0.2-0.9;

[0008] B: The wire diameter of the fine wire mesh is 0.05-0.6 mm;

[0009] C: The density of the packing body is 3-200 layers of fine wire mesh per centimeter along the axial length;

[0010] D: The diameter of the filler body is 50-500 mm;

[0011] E: The mesh size of the fine wire mesh is 30-300 meshes.

[0012] The beneficial effect of the above technical solution is that by adopting the stacking of fine wire mesh to form the packing layer, the whole packing body has good thermal conductivity in the radial direction. Although the two adjacent layers of fine wire mesh of the packing body can also contact each other, the contact effect between them is not good, which makes the thermal conductivity of the packing body in the axial direction relatively slightly poor, which is beneficial to maintain a large temperature difference at both ends of the heat regenerator, which is beneficial to improve the thermoacoustic conversion efficiency of the whole thermoacoustic core element and improve the operating efficiency of the whole thermoacoustic refrigeration system.

[0013] The thermoacoustic core element in the above technical solution also includes two heat exchangers, the heat regenerator is sandwiched between the two heat exchangers, and the two heat exchangers are respectively a hot end heat exchanger and a cold end heat exchanger.

[0014] The beneficial effect of the above technical solution is that the two heat exchangers form a temperature difference at both ends of the regenerator, so that the regenerator converts thermal energy into sound wave energy to transfer energy in the ring loop.

[0015] The heat exchanger in the above technical solution includes a pancake-shaped heat exchanger, a serpentine heat exchange channel is arranged in the heat exchanger, and the heat exchanger is densely covered with air holes that pass through both ends of the heat exchanger and are staggered with the heat exchange channel. The air holes are flat holes, and the air holes on the heat exchanger are parallel to each other.

[0016] The beneficial effects of the above technical solution are: its structure is simple and the heat exchange efficiency is low, especially the air holes can also allow the working fluid gas to flow smoothly.

[0017] The thermoacoustic core element in the above technical solution further comprises two trumpet-shaped docking ports, the thick ends of the two docking ports are close to each other and are respectively docked at ends of the two heat exchangers that are away from each other.

[0018] The beneficial effect of the above technical solution is that the thermal buffer tube and the thermoacoustic core element can be connected through the docking interface, especially when the diameter of the thermal buffer tube is smaller than the cross-sectional area of ​​the thermoacoustic core element, the docking interface is used for transitional connection.

[0019] The working gas in the above technical solution meets at least one of the following conditions:

[0020] A: The working gas is at least one of nitrogen, argon, hydrogen, helium, carbon dioxide and air;

[0021] B: The pressure of the working gas in the annular loop is 1-50 MPa.

[0022] The beneficial effects of the above technical solution are: it is environmentally friendly and the pressure of the working gas can be set according to the needs of the optimal operating state of the equipment.

[0023] The heat source temperature of the thermoacoustic engine described in the above technical solution is 300-1000K.

[0024] The beneficial effect of the above technical solution is that the thermoacoustic engine can fully utilize various low-grade heat for refrigeration and has good environmental protection performance.

[0025] The total length of the annular loop in the above technical solution is 4-9m.

[0026] The beneficial effect of the above technical solution is that the operating efficiency of the entire four thermoacoustic core elements is in an optimal state.

[0027] The heat buffer tube in the above technical solution comprises a stainless steel tube and a heat-insulating sleeve sleeved outside the stainless steel tube.

[0028] The beneficial effect of the above technical solution is that it can avoid heat loss caused by the reciprocating working gas near the hot end heat exchanger exchanging heat with the room temperature environment through the heat buffer tube.

[0029] The regenerator in the above technical solution further comprises a shell and tube, and the filler body is filled in the shell and tube.

[0030] The beneficial effect of the above technical solution is that the shell tube is used as a filling carrier of the filler body, and the shell tube can be a stainless steel tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the asymmetric ceramic loop traveling wave thermoacoustic refrigeration system according to Example 1 of the present invention;

[0032] Figure 2 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention;

[0033] Figure 3 Schematic diagram of the structure of the thermoacoustic core element in an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of an end face of the thermoacoustic core element described in an embodiment of the present invention;

[0035] Figure 5 4 is a cross-sectional view of the thermal buffer tube according to an embodiment of the present invention.

[0036] In the figure: 1, thermoacoustic nuclear element; 1a, thermoacoustic engine; 1b, thermoacoustic refrigerator; 11, regenerator; 111, filler body; 112, shell and tube; 12, heat exchanger; 12a, hot end heat exchanger; 12b, cold end heat exchanger; 121, heat exchange body; 122, heat exchange channel; 123, air vent; 13, docking port; 2, thermal buffer tube; 21, stainless steel tube; 22, insulation sleeve. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] like Figure 1-Figure 5 As shown, this embodiment provides an asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system, including four thermoacoustic core elements 1 and four thermal buffer tubes 2, the four thermoacoustic core elements 1 and the four thermal buffer tubes 2 are alternately connected to form a ring loop, the ring loop is filled with a working fluid gas, one of the thermoacoustic core elements 1 is used as a thermoacoustic engine 1a, which is used to absorb heat energy and convert it into sound wave energy, and the remaining three thermoacoustic core elements 1 are used as thermoacoustic refrigerators 1b, which are used to absorb sound wave energy for cooling, and the thermoacoustic core elements 1 A regenerator 11 is provided therein, and a filler body 111 in the regenerator 11 is a wire mesh filler formed by stacking multiple layers of fine wire mesh with a high mesh number, and the four thermoacoustic core elements 1 are respectively located at four pure traveling wave positions in a typical sound field distribution. Three thermoacoustic refrigerators are driven by a thermoacoustic engine, and the fillers of the thermoacoustic engine and the thermoacoustic refrigerator are both stacked with fine wire mesh with a high mesh number, and at the same time, the four thermoacoustic core elements are respectively located at four pure traveling wave positions in a typical sound field distribution, so that its cooling efficiency is high.

[0039] The filler body 111 in the above technical solution meets at least one of the following conditions:

[0040] A: The volume porosity of the filler body 111 is 0.2-0.9 (it can be any value among 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 or a range corresponding to any two values);

[0041] B: The wire diameter of the fine wire mesh is 0.05-0.6 mm (it can be any value among 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm and 0.6 mm, or a range corresponding to any two values);

[0042] C: The density of the filler body 111 is 3-200 layers of fine wire mesh per centimeter along the axial length (it can be any value among 3 layers, 10 layers, 20 layers, 30 layers, 40 layers, 50 layers, 60 layers, 70 layers, 80 layers, 90 layers, 100 layers, 110 layers, 120 layers, 130 layers, 140 layers, 150 layers, 160 layers, 170 layers, 180 layers, 190 layers and 200 layers, or a range corresponding to any two values);

[0043] D: the diameter of the filler body 111 is 50-500 mm (it can be any value among 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, 210 mm, 220 mm, 230 mm, 240 mm, 250 mm, 260 mm, 270 mm, 280 mm, 290 mm and 300 mm, or a range corresponding to any two values);

[0044] E: The mesh number of the fine wire mesh is 30-300 mesh (can be any value or any value among 30 mesh, 40 mesh, 50 mesh, 60 mesh, 70 mesh, 80 mesh, 90 mesh, 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, 210 mesh, 220 mesh, 230 mesh, 240 mesh, 250 mesh, 260 mesh, 270 mesh, 280 mesh, 290 mesh and 300 mesh) The range corresponding to the two values); the filler layer is formed by stacking fine wire meshes, so that the entire filler body has good thermal conductivity in the radial direction, and although the two adjacent layers of fine wire mesh of the filler body can also contact each other, the contact effect between them is not good, so that the thermal conductivity of the filler body in the axial direction is relatively slightly poor, which is conducive to maintaining a large temperature difference at both ends of the heat regenerator, which is conducive to improving the thermoacoustic conversion efficiency of the entire thermoacoustic core element and improving the operating efficiency of the entire thermoacoustic refrigeration system.

[0045] like Figure 3 As shown, the thermoacoustic core element 1 in the above technical solution also includes two heat exchangers 12, and the regenerator 11 is sandwiched between the two heat exchangers 12, and the two heat exchangers 12 are respectively a hot end heat exchanger 12a and a cold end heat exchanger 12b; in this way, a temperature difference is formed between the two heat exchangers at both ends of the regenerator, so that the regenerator converts thermal energy into sound wave energy to transfer energy in the ring loop.

[0046] like Figure 2 As shown, the heat exchanger 12 in the above technical solution includes a pancake-shaped heat exchange body 121, a serpentine heat exchange channel 122 is arranged in the heat exchange body 121, and the heat exchange body 121 is densely covered with air holes 123 that penetrate through both ends of the heat exchange body 121 and are staggered with the heat exchange channel 122, the air holes 123 are flat holes, and the air holes 123 on the heat exchange body 121 are parallel to each other; its structure is simple, and the heat exchange efficiency is low, especially the air holes can also allow the working gas to flow smoothly.

[0047] like Figure 3 As shown, the thermoacoustic core element 1 in the above technical solution also includes two trumpet-shaped docking ports 13, the thick ends of the two docking ports 13 are close to each other, and are respectively docked at one end of the two heat exchangers 12 that are away from each other; in this way, the docking port can be used to meet the docking of the thermal buffer tube and the thermoacoustic core element, especially when the diameter of the thermal buffer tube is smaller than the cross-sectional area of ​​the thermoacoustic core element, the docking port is used for transition docking.

[0048] The working gas in the above technical solution meets at least one of the following conditions:

[0049] A: The working gas is at least one of nitrogen, argon, hydrogen, helium, carbon dioxide and air;

[0050] B: The pressure of the working gas in the annular loop is 1-50MPa (it can be any value among 1MPa, 10MPa, 20MPa, 30MPa, 40MPa, 50MPa or the corresponding range between any two values); it has good environmental protection performance and the pressure of the working gas can be set according to the needs of the optimal operating state of the equipment.

[0051] The heat source temperature of the thermoacoustic engine 1a described in the above technical solution is 300-1000K (it can be any value among 300K, 400K, 500K, 600K, 700K, 800K, 900K and 1000K or the corresponding range between any two values); the thermoacoustic engine can make full use of various low-grade heat for cooling, and its environmental protection is good.

[0052] The total length of the annular loop in the above technical solution is 4-9m (it can be any value among 4m, 5m, 6m, 7m, 8m and 9m or the corresponding range between any two values); this makes the operating efficiency of the entire four thermoacoustic core elements in the best state.

[0053] like Figure 5 As shown, the heat buffer tube 2 in the above technical solution includes a stainless steel tube 21 and an insulation sleeve 22 sleeved outside the stainless steel tube 21; this can avoid heat loss caused by the reciprocating working gas near the hot end heat exchanger exchanging heat with the room temperature environment through the heat buffer tube.

[0054] like Figure 4 As shown, the regenerator 11 in the above technical solution further includes a shell tube 112, and the filler body 111 is filled in the shell tube 112; thus, the shell tube serves as a filling carrier of the filler body, and the shell tube can be a stainless steel tube.

[0055] Embodiment 1: Four thermoacoustic nuclear elements are connected by four heat buffer tubes to form a ring loop, and the overall tube length of the ring loop is 8 meters. The four thermoacoustic nuclear elements 1 are respectively located at four pure traveling wave sites in the typical sound field distribution, wherein one thermoacoustic nuclear element is a thermoacoustic engine, and the other three thermoacoustic nuclear elements are thermoacoustic refrigerators. The working fluid gas of the thermoacoustic refrigeration system is helium, and its pressure is 4.2MPa. The diameter of the filler body is 125mm. The heating temperature of the hot end heat exchanger of the thermoacoustic engine is 630K, the ambient temperature is 303K, and the output refrigeration temperature is 274K. The COP ratio of the cooling capacity to the heating capacity of the thermoacoustic refrigeration system can reach 0.81, and the obtained refrigeration power is 5723.1W.

[0056] Embodiment 2: Four thermoacoustic nuclear elements are connected by four heat buffer tubes to form a ring loop, and the overall tube length of the ring loop is 6 meters. The four thermoacoustic nuclear elements 1 are respectively located at four pure traveling wave sites in the typical sound field distribution, wherein one thermoacoustic nuclear element is a thermoacoustic engine, and the other three thermoacoustic nuclear elements are thermoacoustic refrigerators. The working fluid gas of the thermoacoustic refrigeration system is helium, and its pressure is 3.7MPa. The diameter of the filler body is 99mm. The heating temperature of the hot end heat exchanger of the thermoacoustic engine is 630K, the ambient temperature is 303K, and the output refrigeration temperature is 277K. The COP ratio of the cooling capacity to the heating capacity of the thermoacoustic refrigeration system can reach 0.78, and the obtained refrigeration power is 5129.0W.

[0057] Embodiment 3: Four thermoacoustic nuclear elements are connected by four heat buffer tubes to form a ring loop, and the overall tube length of the ring loop is 5 meters. The four thermoacoustic nuclear elements 1 are respectively located at four pure traveling wave sites in the typical sound field distribution, wherein one thermoacoustic nuclear element is a thermoacoustic engine, and the other three thermoacoustic nuclear elements are thermoacoustic refrigerators. The working fluid gas of the thermoacoustic refrigeration system is helium, and its pressure is 3.7MPa. The diameter of the filler body is 125mm. The heating temperature of the hot end heat exchanger of the thermoacoustic engine is 630K, the ambient temperature is 303K, and the output refrigeration temperature is 275K. The COP ratio of the cooling capacity to the heating capacity of the thermoacoustic refrigeration system can reach 0.80, and the obtained refrigeration power is 5532.2W.

[0058] Comparative Example 1: Same as Example 1, except that there are two thermoacoustic core elements, one of which is a thermoacoustic engine and the other is a thermoacoustic refrigerator. The COP ratio of cooling capacity to heating capacity of the thermoacoustic refrigeration system can reach 0.42, and the obtained cooling power is 1676.2W.

[0059] Comparative Example 2: Same as Example 1, except that there are three thermoacoustic core elements, one of which is a thermoacoustic engine, and the other two are thermoacoustic refrigerators. The COP ratio of cooling capacity to heating capacity of the thermoacoustic refrigeration system can reach 0.76, and the obtained cooling power is 4698.3W.

[0060] Comparative Example 3: Same as Example 1, except that there are five thermoacoustic core elements, one of which is a thermoacoustic engine, and the other four are thermoacoustic refrigerators. The COP ratio of cooling capacity to heating capacity of the thermoacoustic refrigeration system can reach 0.65, and the obtained cooling power is 4186.5W.

[0061] It can be seen that compared with the structure in which one thermoacoustic engine drives one thermoacoustic refrigerator (Comparative Example 1), the efficiency of the structure in which one thermoacoustic engine drives three thermoacoustic refrigerators (Example 1) is increased by 48%, and the efficiency of the structure in which one thermoacoustic engine drives two thermoacoustic refrigerators (Comparative Example 2) is still increasing relative to Comparative Example 1, and the efficiency of Example 1 is still further increasing relative to Comparative Example 2, but when one thermoacoustic engine drives four thermoacoustic refrigerators, the efficiency of Comparative Example 3 (compared to Comparative Example 2 and Example 1) is greatly reduced. Therefore, using one thermoacoustic engine to drive three thermoacoustic refrigerators is the best technical solution.

[0062] The cross-sectional area of ​​the thermoacoustic core element of this embodiment is much larger than the cross-sectional area of ​​the adjacent thermal buffer tube. This design can achieve high acoustic impedance at the thermoacoustic core, reduce the flow rate of the working gas and thus reduce viscosity loss. At the same time, the docking interface connected at the variable cross-section can avoid the flow unevenness in the radial direction, which is conducive to maximizing the thermoacoustic conversion efficiency at the regenerator. In this embodiment, a ceramic thermal insulation coating can be coated on the outer wall of the docking interface to reduce heat loss.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system, characterized in that: The invention comprises four thermoacoustic nuclear elements (1) and four thermal buffer tubes (2), wherein the four thermoacoustic nuclear elements (1) and the four thermal buffer tubes (2) are alternately connected to form a ring loop, wherein the ring loop is filled with a working fluid gas, wherein one of the thermoacoustic nuclear elements (1) serves as a thermoacoustic engine (1a) for absorbing heat energy and converting it into sound wave energy, and the remaining three thermoacoustic nuclear elements (1) serve as thermoacoustic refrigerators (1b) for absorbing sound wave energy for cooling, wherein the thermoacoustic nuclear element (1) has a regenerator (11), and the filler body (111) in the regenerator (11) is a wire mesh filler formed by stacking multiple layers of fine wire mesh, and the four thermoacoustic nuclear elements (1) are respectively located at four pure traveling wave positions in a typical sound field distribution.

2. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 1, characterized in that: The filler body (111) meets at least one of the following conditions: A: The volume porosity of the filler body (111) is 0.2-0.9; B: The wire diameter of the fine wire mesh is 0.05-0.6 mm; C: The density of the filler body (111) is 3-200 layers of fine wire mesh per centimeter along the axial length; D: The diameter of the filler body (111) is 50-500 mm; E: The mesh size of the fine wire mesh is 30-300 meshes.

3. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 1, characterized in that: The thermoacoustic core element (1) further comprises two heat exchangers (12), the heat regenerator (11) being sandwiched between the two heat exchangers (12), and the two heat exchangers (12) are respectively a hot end heat exchanger (12a) and a cold end heat exchanger (12b).

4. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 3, characterized in that: The heat exchanger (12) comprises a pancake-shaped heat exchange body (121), a serpentine heat exchange channel (122) is arranged in the heat exchange body (121), and the heat exchange body (121) is densely covered with air holes (123) that penetrate through both ends of the heat exchange body (121) and are staggered with the heat exchange channel (122), the air holes (123) are flat holes, and the air holes (123) on the heat exchange body (121) are parallel to each other.

5. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 3, characterized in that: The thermoacoustic core element (1) further comprises two trumpet-shaped docking ports (13), the thick ends of the two docking ports (13) being close to each other and respectively docked at ends of the two heat exchangers (12) that are away from each other.

6. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 1, characterized in that: The working gas meets at least one of the following conditions: A: The working gas is at least one of nitrogen, argon, hydrogen, helium, carbon dioxide and air; B: The pressure of the working gas in the annular loop is 1-50 MPa.

7. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 1, characterized in that: The heat source temperature of the thermoacoustic engine (1a) is 300-1000K.

8. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 1, characterized in that: The total length of the annular loop is 4-9 m.

9. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 1, characterized in that: The heat buffer tube (2) comprises a stainless steel tube (21) and a heat insulation sleeve (22) sleeved outside the stainless steel tube (21).

10. The asymmetric wire mesh loop traveling wave thermoacoustic refrigeration system according to claim 1, characterized in that: The regenerator (11) further comprises a shell tube (112), and the filler body (111) is filled in the shell tube (112).

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