KR200309417Y1 - Parallel thermoacoustic refrigerator - Google Patents

Abstract

The present invention relates to a parallel thermoacoustic cooling device. The resonant tubes of thermoacoustic chillers are arranged in parallel to maintain the environmental friendliness of thermoacoustic chillers and economics of low power consumption. Facilitating changes in the cooling scale while improving the disadvantages of the cooling device. Based on the basic structure of a single resonant tube thermoacoustic chiller, a high-power shared speaker, a stack of porous media in a parallel arrangement, a shared low-temperature heat exchanger and a high-temperature heat exchanger that absorbs and releases the heat of the stack, the internal inertness It consists of a set of resonance tubes arranged in parallel to form a resonance wave using gas. The increase in cooling efficiency is achieved through parallel stacks and resonance tubes, where the hot and cold heat exchangers are shared by the parallel resonance tubes. Therefore, the parallel thermoacoustic cooling device can improve the cooling efficiency performance through the parallel arrangement and control the change of cooling scale from small to large.

Description

Parallel thermoacoustic refrigerator

Conventional compressed cooling apparatuses use refrigerants such as CFCs (chlorinated fluorocarbons) and the like, and these refrigerants have been cited as the main culprit of various environmental pollutions including ozone decay and global warming. Therefore, as part of the development of new technology to solve the refrigerant problem of the compressed cooling device, an environmentally friendly thermoacoustic cooling device was introduced. However, despite the many advantages including environmental friendliness, thermoacoustic chillers are currently inferior in technology compared to conventional compressed chillers in terms of cooling efficiency. Accordingly, conventional cooling apparatuses include compression type cooling apparatuses using refrigerants such as CFCs that cause environmental problems, and thermoacoustic cooling apparatuses using inert gas and sound waves without using existing refrigerants. Briefly describe the principles of compressed chillers and thermoacoustic chillers.

A compressor refrigerator includes a compressor (11), a condenser (12), an expander (13), an evaporator (14), an alternating current (15) as shown in the schematic diagram of FIG. ) And its connecting tube. In the compressor (11), the cooling gas such as CFC exits through the discharge pipe and enters the condenser 12. When the cooling gas enters the condenser 12, the temperature and pressure of the cooling gas are controlled by a restrictor at the opposite end of the condenser. It will increase greatly. The condenser 12 cools the hot cooling gas coolly, and there is an exothermic process in which heat is emitted from the surface of the condenser. If the cooling gas fails to receive heat, it liquefies and becomes a liquid, which exits the condenser and enters the capillary expander 13. The liquid coolant exits the expander 13 again and enters the tube of the large evaporator 14, and as the pressure drops due to the rapidly increased tube size, vaporization occurs to change the liquid into a mixture of liquid and gas. The mixture of liquid and gas is gradually reduced to a gaseous state through an endothermic process of absorbing heat while passing through the evaporator 14. The gaseous cooling gas exits the evaporator and returns to the compressor 11 through the suction pipe to complete a cycle of cooling.

The advantage of the compression type chiller is its high cooling efficiency. Disadvantages are that existing refrigerants such as CFCs cause environmental pollution and ozone depletion, so development of environmentally friendly refrigerants is required. In addition, the maintenance cost of the components, including the compressor (11) is high, the noise and vibration is large, the temperature is difficult to control, the consumption of power to use is a disadvantage.

The basic configuration of the thermoacoustic refrigerator includes a sound wave generator (speaker system) 21, a stack 22, a resonance tube 23, a high temperature heat exchanger 24 and a low temperature heat exchanger as shown in FIG. 25) and other components. The basic principle of the thermoacoustic cooling device is to vibrate the diaphragm of the acoustic generator 21 in the AC power supply 26 to cause pulsation of pressure in the gas or fluid inside the resonance tube 23 to form a standing wave. At this time, the frequency of the sound wave driven in the speaker system 21 and the length and radius of the resonance tube have a close relationship. The pulsation of standing waves inside the resonance tube is accompanied by temperature changes due to adiabatic compression and expansion of the gas inside the tube. The heat retained by the gas during this temperature change process is transferred to the stack 22, which is a porous medium existing inside the resonance tube 23. The stack of the thermoacoustic chiller shown in Fig. 2 is composed of a porous medium of spherical, slit, cylindrical, or square column shape in which the inert gas in the resonance tube is free to move. In addition, the stack is composed of a low thermal conductivity medium to have a temperature gradient in the length direction of the stack. Therefore, the stack serves to transfer heat to both the high temperature heat exchanger 24 and the low temperature heat exchanger 25 through absorption and release of heat from the gas. The heat of the high temperature heat exchanger 24 thus transferred is cooled by using a surrounding coolant or a cooling fan, and in the low temperature heat exchanger 25, cooling water such as water or glycol is circulated and released to the outside of the resonance tube 23 to be cooled. You get the effect.

Thermoacoustic chillers are environmentally friendly because they do not use refrigerants as compared to compressed chillers, and as there is no compressor 11, the maintenance cost of each part is small, no lubricating oil is required, noise and vibration are small, and fine temperature control is achieved. It is easy and the power consumption for operation is small. A disadvantage of thermoacoustic chillers is their relatively low cooling efficiency when compared to compressed chillers. And another feature of the thermoacoustic cooling device is that the size of the cooling system depends on the driving frequency of the speaker system 21, and the cooling scale is more useful for large-scale cooling at low frequency driving.

The single resonant tube thermoacoustic chiller is inferior in current technology to the cooling efficiency in spite of many advantages including environmental friendliness compared to the conventional compressed chiller. Therefore, by improving the conventional single-resonance tube thermoacoustic chiller through the optimal parallel coupling, the present invention is to improve the low cooling efficiency, which is a disadvantage compared to the compressed chiller, while maintaining the advantages including the environmental friendliness of the thermoacoustic chiller. This is a technical problem to be achieved. The parallel thermoacoustic cooling device arranges the thermoacoustic cooling devices in parallel to maintain the advantages of thermoacoustic cooling devices, such as environmental friendliness, low noise and vibration, low cost of maintenance, long life, and low power consumption. In addition, the parallel arrangement of the resonance tube effectively improves the low cooling efficiency, which is a disadvantage compared to the compression cooling system in the thermoacoustic cooling system, and at the same time facilitates the adjustment of the change in the cooling scale from small cooling to large cooling.

1 is a schematic view of a compression cooling machine

2 is a schematic diagram (a) of a thermoacoustic chiller and a cross section (b) of a thermoacoustic stack;

Figure 3 is a schematic diagram of a parallel thermoacoustic chiller

<Description of the symbols for the main parts of the drawings>

11: Compressor 12: Condenser 13: Expander 14: Evaporator 15: AC Power

21 Speaker system 22 Thermoacoustic stack 23 Resonance tube 24 High temperature heat exchanger 25 Low temperature heat exchanger 26 AC power source 27 Cross section of stack

31 speaker system 32 thermoacoustic stack 33 resonance tube 34 high temperature heat exchanger 35 low temperature heat exchanger 36 ac power

A parallel thermoacoustic refrigerator is a design in which a single resonance tube thermoacoustic refrigerator is arranged in parallel. As shown in FIG. 3, the basic configuration of the parallel type thermoacoustic cooling machine is maintained as the basic configuration of the single resonance tube thermoacoustic cooling device of FIG. 2 as it is. 33, the high temperature heat exchanger 34, the low temperature heat exchanger 35, and the like. However, the external configuration of the parallel thermoacoustic cooling device of FIG. 3 is attached to a speaker system 31 shared at one end of a plurality of resonance tubes 33 arranged in parallel unlike the thermoacoustic cooling device of FIG. 2. Each speaker system may be attached to each resonance tube. The parallel arrangement of the resonance tubes can take many forms, including arranging three resonance tubes in a triangular prism form. In the case of Fig. 3, an example of a parallel resonance tube in which three resonance tubes are arranged side by side is shown. The size of the cooling system is determined according to the relationship between the drive frequency of the speaker system 31 and the length and quantity of the resonance tube 33. The length of the resonance tube is effective to have a length corresponding to half wavelength or one quarter wavelength of the speaker driving frequency. If one end of the resonance tube is blocked and the gas pressure is zero, the driving frequency corresponding to half wavelength is used. If one end of the resonance tube is a Helmholtz tube, etc., if the gas pressure is not zero, it corresponds to one quarter wavelength. Use drive frequency. Inside each resonance tube is a parallel thermoacoustic stack 32, which is a porous medium. One side of each stack is connected to a high temperature heat exchanger 34 and the other side is connected to a low temperature heat exchanger 35. The high temperature heat exchanger 34 and the low temperature heat exchanger 35 are designed to be shared in all parallel resonance tubes. Therefore, the parallel thermoacoustic cooling device can be configured to increase the relatively low cooling efficiency which is a disadvantage in each cooling device, and at the same time, it is easy to control the change of the cooling scale from small cooling to large cooling.

The parallel thermoacoustic cooling device arranges the thermoacoustic stack 32 and the resonance tube 33 in parallel in the basic configuration of the thermoacoustic cooling device. The parallel arrangement of the resonance tubes can be configured in various forms. In the case of FIG. 3, three resonance tubes are arranged side by side. A key component of a parallel thermoacoustic chiller starts with the parallel thermoacoustic stack 32 of FIG. 2, and fabricates a porous stack using a parallel arrangement. The shape of the pore is spherical, cylindrical, rectangular, etc. can be produced in various ways depending on the cooling performance and the ease of manufacture of the material. Therefore, in the parallel resonance tube 33 having an inert gas such as helium gas, gas movement inside is made possible through the parallel thermoacoustic stack 32. The thickness in the resonator tube length direction is appropriately adjusted so that cooling using sound waves is optimal. A key technique in the fabrication of thermoacoustic stacks is to control the size of the pores in the stack so that both ends of the stack are thermally insulated while the inert gas movements at both ends are free and sound waves are transmitted. As a result, the parallel thermoacoustic stack 32 has a severe temperature gradient due to the absorption and release of heat by each stack. Increasing the pressure of the inert gas present inside the resonance tube increases the temperature difference across the stack, resulting in a more severe temperature gradient. The parallel thermoacoustic stack having the structure as described above enables low temperature and high temperature generation by a thermoacoustic cooling method. Therefore, the cooling efficiency can be increased, and the change in the cooling scale can be appropriately adjusted from small scale to large scale according to the proper combination of the two cooling apparatuses.

As shown in FIG. 3, the high temperature heat exchanger 34 and the low temperature heat exchanger 35 are configured to be shared by all parallel resonant tubes. The high temperature heat exchanger 34 is in contact with a liquid such as water in the case of water-cooled, and serves to cool the high-temperature heat exchanger by operating the fan in the case of air-cooled. The low temperature heat exchanger (35) circulates the liquid therein to maintain a low temperature state and is used for cooling purposes. Speakers are also designed to be shared by multiple resonators, and the length and diameter of the resonators are determined by the frequency of the sound waves used.

Parallel thermoacoustic chillers maintain the advantages of thermoacoustic chillers. The advantages of the parallel thermoacoustic chiller are environmentally friendly because they do not use refrigerant, and as compared to the compressed chiller, there is no compressor (11), so the maintenance cost of each part is small, no lubricant is required, noise and vibration are small, It is easy to control fine temperature and the power consumption for operation is small. And the parallel thermoacoustic chiller turns the disadvantage of the thermoacoustic chiller into an advantage. Therefore, the parallel thermoacoustic cooling device can improve the low cooling efficiency, which is a disadvantage of the thermoacoustic cooling device, compared to the compression type cooling device. In the parallel thermoacoustic cooling system, the size of the cooling system can be adjusted from small to large by appropriately combining the size of the frequency of the acoustic wave and the number and shape of the array resonance tubes.

The parallel thermoacoustic cooling device can be applied to various refrigeration and refrigerating devices. For example, various home appliances such as cold / hot water purifiers, Kim Chang-dok, automotive cold / hot clothes, towel makers, air conditioners, coolers of computer CPU chips, laser diode modulators for optical communication, and ink jet printer heads. The parallel thermoacoustic cooling device can be applied to the field of electronic components such as constant temperature control, mobile communication unmanned base stations, and electronic component cabinets for communication. In addition, it can be used in various applications such as semiconductor manufacturing coolers, scientific measuring equipment, medical devices, vacuum devices, etc., and can be used for cooling facilities such as large refrigerators, freezers, and large residential buildings.

The heat transmitted from the parallel thermoacoustic cooling machine to the high temperature heat exchanger is cooled by water or air cooling, but the heat may be directly used without cooling. Therefore, the parallel thermoacoustic cold and hot machine that uses the heat of the high temperature heat exchanger or the heat and cold of the high and low temperature heat exchanger is a simple application of the parallel thermoacoustic cooler. Similarly, a parallel thermoacoustic chiller, which uses low temperature as a core, can be immediately applied to a parallel thermoacoustic engine because the heat can be converted into work and used in a heat engine.

The parallel thermoacoustic cooling device is an environmentally friendly cooling device because it uses a gas or a fluid that is safe without using a refrigerant that causes ozone layer decay and global warming. And it has a lot of advantages over the conventional compressed cooling machine. Since there is no compressor necessary for conventional compressed cooling equipment, mechanical failure is relatively small and no lubricant is required to maintain mechanical operation. Therefore, the maintenance cost of the parallel thermoacoustic chiller is greatly reduced compared to the compressed chiller. In addition, the power consumption required to operate the cooler can be significantly reduced compared to the conventional method, so it is economical. On the one hand, there may be a question that the noise from the parallel thermoacoustic cooler is concerned, but the sound required to operate the cooler is designed to be limited to the resonance tube inside the cooler, so the actual noise exposed to the outside is rather small compared to the compressed cooler. Therefore, the magnitude of noise and vibration is smaller than that of a conventional compressed cooling machine. In parallel thermoacoustic cooling system, the size of the cooling system can be controlled from small to large size by appropriately combining the size of the frequency of the acoustic wave and the quantity and shape of the array resonance tube.

Expected effects can greatly contribute to the development of the field of thermoacoustics as a new technical field combining acoustics and thermodynamics. Domestic and foreign thermoacoustic research is an interdisciplinary multidisciplinary research area with potential for future professional technology. Industrially, it is an environmentally friendly parallel thermoacoustic chiller that can replace existing compressed chiller with unlimited potential regardless of cooling scale. Parallel thermoacoustic chillers have many applications, ranging from small-scale cooling, such as semiconductor cooling, to large-scale cooling, such as building cooling. Therefore, the commercialization of the cooling apparatus using parallel thermoacoustic can expect a breakthrough in the refrigeration refrigeration industry. In addition, since the development of the parallel thermoacoustic cooler can be directly applied to the development of the parallel thermoacoustic engine, a rough ripple effect occurs in the entire industry.

Claims (2)

It features parallel resonance tube, porous stack, speaker shared by parallel resonance tube, low temperature and high temperature heat exchanger shared by parallel resonance tube, and maintains the advantages including environmental friendliness of single resonance tube thermoacoustic chiller. Parallel thermoacoustic chiller that facilitates the diversification of the system and improves the cooling efficiency compared to a single resonance tube thermoacoustic chiller. Parallel thermoacoustic chiller that uses both heat and cold at the same time as an application of parallel thermoacoustic chiller.