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Main heat exchanger in liquid nitrogen frost Engine Technology


To 296.94K. In the 25s, are basically stable. Figure 7 shows the dynamic First Road Tube wall temperature distribution. The figure shows, all the way for a single tube, the wall temperature increases along the direction of the flow of nitrogen; ago all the way to the wall temperature is greater than the magnitude of the wall all the way; wall temperature decreases with time increase, reduce speed with time decreases; down in the 15s or so stable. Integrated shows, three along the time direction, relatively large changes in the beginning, then gradually stabilize, because the beginning of the temperature difference between them is relatively large. Three of the temperature distribution more reasonable. Ol41. (S) Figure 6, the outlet temperature of nitrogen dynamics 3o0296292O4 Conclusion Figure 7 First Road Tube wall temperature of liquid nitrogen dynamic distribution of the circulatory system proposed heat exchanger frost basic standards. Is to design a part, including mixing and heat transfer part of the new model. Part of the heat transfer unit, in accordance with the cross-mix of cross-flow and do not establish a dynamic model, computer simulation of the transient and steady-state temperature distribution, three-dimensional and two-dimensional surface or curve display. (Continued on page 57) 2003 Vol 31, No. 5 Fluid Machinery 572.27. Figure 6 shows the throttle opening increases before and after the exhaust temperature, air outlet refrigerant temperature, high-pressure side heat exchanger exit refrigerant temperature and suction temperature decreased by about 31.2 ~ C, 3. 2 ~ C, 5.8 ~ C, 4.9 ~ C, the exhaust temperature is clearly higher than the other locations the amount of working fluid temperature is much greater, that is most sensitive to the throttle opening degree adjustment. The position of the working fluid temperature of about tens of seconds of time to stabilize. 8 Yap 5a_21100T (s) Figure 5 throttle opening during the working fluid pressure increases t (s) Figure 6, the process of the throttle opening increases the working fluid temperature t (s) Figure 7 by opening the throttle Large changes in air temperature process (figure, curves overlap) from Figure 7, the throttle opening increases, the outlet air temperature cooled down, the evaporator outlet air temperature increased,[link widoczny dla zalogowanych], the change is far less than the emission volume the change in temperature, takes tens of seconds of time to stabilize. It should be noted that when the throttle opening increases, the pressure ratio decreases, while increasing the amount of refrigerant cycle, tends to increase the cooling capacity; on the other hand, evaporation temperature, the evaporator heat transfer temperature dropped, so that tends to reduce the cooling capacity, the actual evaporator outlet air temperature may increase, in theory, may also be reduced by the device to structural parameters, charge amount and complexity of operating parameters. 4 Conclusion monoxide gas carbon dioxide refrigeration system, cross-up and throttle opening in the adjustment process in the dynamic characteristics of experimental research on refrigerant pressure, temperature and air temperature, the dynamic response of typical parameters were measured and brief analysis of the data and analysis results can provide reference for the control system design. References [1] Wang Kan Wang and so on. co2 cross-critical water circulation system of a water heat pump experimental study [J]. HVAC, 2001, (3): 1 ~ 4. [2] Ma too and so on. Small refrigeration unit of carbon dioxide expander [A]. Chinese Engineering Thermophysics of thermodynamics and energy utilization Proceedings Tenth Annual Meeting [C], Qingdao, 2001:389 ~ 394. [3] Jiang-Ping Chen, Mu Jingyang, Jane Xiao-wen and so on. Carbon Dioxide Research Progress of automotive air conditioning system (a) [J]. Fluid Machinery, 20O0, 28 (4): 50 ~ 54. [4] Ding Guoliang, Huang Dongping, Zhang Lu. Cross-state simulation of carbon dioxide Automotive Air Conditioning [J]. Engineering Thermophysics,[link widoczny dla zalogowanych], 200], (3): 272 ~ 274. [5], after Zhang Lei, Xuan YM, Li Yan collar. Tank thermal characteristics and R744 Air Conditioning Systems [J]. Mechanical and Electrical Equipment, 2002, (2): 12 ~ 15. About the Author: After Zhang Lei, male, born in 1971, teachers,[link widoczny dla zalogowanych], mainly in refrigeration and air conditioning the application of basic research. Address: Xiao Lin Wei 200, Nanjing, Jiangsu 210094, Nanjing University of Power Engineering. (Continued from page 64) the simulated temperature distribution clearly reflects the heat exchanger in the fluid and wall temperature with the relationship between location and time. References [1] Ling Hefei, Shu water out. Liquid nitrogen expansion process and parameters of the engine analysis [J]. Fluid Machinery, 2002,30 (5): 21 ~ 24. [2] Tao Wen-Quan. Numerical Heat Transfer [M]. Xi'an: Xi'an Jiaotong University Press,[link widoczny dla zalogowanych], 1988. [3] [United States] Shi days. Computational Heat Transfer [M]. Beijing: Science and Technology Press, l987. About the author: Shu Shui-Ming, male,[link widoczny dla zalogowanych], born in 1954, associate professor in refrigeration and cryogenic engineering teaching and research work. Address: 430074 Wuhan City, Hubei Huazhong University of Science Energy and Power Engineering.

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