Abstract:In response to the global call of environmental protection, a kind of environment-friendly air circulation refrigeration system is analyzed . Working principle of air cycle refrigeration system is introduced.The advantages of air refrigeration system are summarized, and main research achievements and progress in related fields at home and abroad are briefly narrated. The application in the field of the research of air cycle refrigeration are introduced as a clean and environment-friendly refrigeration way, in addition, the future development direction and the prospect of air cycle refrigeration technology are also predicted. Air cycle refrigeration technology will take up an important position in the future air conditioning field according the analysis.

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Abstract. Traditionally, the pot used in cook-stoves have been constructed without paying much attention to their heat gains, while in the process of heat transfer with high temperature flue gas, it will lose a lot of heat. In sight of that, this paper introduces an improved pot with the incorporation of scientific understanding of their working principle, and design an improved pot with multi-layer flue, which has inner flue and outer flue, the present of it increases the surface area for heat transfer compared to the original pot, further-more, it would pick up some the heat in the gas by convection, and re-radiated it back to the pot, and then enhance the thermal efficiency of the pot. Numerical simulation and relative analysis have been conducted about the improved and original pots, and the result shows that thermal efficiency about the improved pot is higher than original pot about 20%-28%, and it has different effect in various operating conditions.