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《Journal of Refrigeration》 2017-05
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Experimental Study on Multilayer Rectangular Micro-channel Joule-Thomson Cryocooler with Nitrogen

Geng Hui;Cui Xiaoyu;Wang Wenqing;Weng Jianhua;School of Energy and Power Engineering,University of Shanghai for Science and Technology;School of Energy & Mechanical Engineering,Shanghai University of Electric Power;  
A multilayer micro-channel Joule-Thomson( J-T) cryocooler was designed by combining several layers of rectangular microchannels with a coke soup cooler. The heat recovery section was constructed using three layers of high-and low-voltage rectangular channels. Experiments were conducted using nitrogen as a refrigerant with inlet pressures ranging from 4 to 8 MPa,and the temperatures of each measuring point of the multi-layer microchannels in the J-T cryocooler were collected. The cooling characteristics of nitrogen in the various stages of the refrigeration system were analyzed,and the experimental results obtained when nitrogen and argon were used in the JT cryocooler were compared. The results show that,when the inlet pressure is 4-8 MPa,a lower temperature for the nitrogen cold end with increasing pressure corresponds to a shorter time period to reach a stable cold-end temperature. When the inlet pressure is 8 MPa,the cold-end temperature reaches 1. 7 ℃ at approximately 200 s. The argon cold-end temperature is lower than that of the nitrogen at the same inlet pressure; however,the time required for the nitrogen to reach the cold-end temperature is shorter than that for the argon. When the inlet pressure is 7 MPa,the temperature of the cold-end argon gas occurs approximately 450 s ahead of time. Further,the temperature drops for nitrogen at an 8 MPa inlet pressure and argon at a 4-5 MPa inlet pressure are similar. In addition,the nitrogen cooling time is shorter. Thus,the use of nitrogen instead of argon can reduce the cooling costs.
【Fund】: 上海市自然科学基金(14ZR1429100)资助~~
【CateGory Index】: TB657
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