Compression / Ejection Refrigeration Cycle System. New Steam

With the improvement of standard of living, air-conditioner has been more and more popularized, building energy consumption will continue to increase, which makes energy issues more prominent. At the eleven five-year period, Energy saving has already become a significant task. It's a core objective to decrease energy consume of gross domestic product per unit to percent twenty. At the same time, mechanical compression refrigerators consume a big quantity of electric power and indirectly make the pollution problem sever, which bring forward a great challenge to the human's sustainable development. With regard to implementation of objective of energy saving, energy saving of refrigerating equipment has enormous realistic and historical significance.In the paper, the ejector partly substitutes a throttle device. High-press refrigerants inject refrigerant of evaporator via ejector, which recovers partly expansion energy of refrigerants and increase pressure of compressor entry. At the same time, ejector decreases pressure of throttle valve entry to decrease throttle loss, which ultimately increase energy efficiency and exergy efficiency of refrigeration system. The following are the main researched contents:Firstly, this paper introduces exergy analysis conventional vapour compression of conventional vapour compression refrigeration system. It analyzes necessity of system's exergy and approach decreasing exergy loss. This paper also introduce mathematical module of exergy loss of unit'component.Secondly, in the paper, the study of the performance of new compression-eject refrigeration system is carried out. Physical model and mathematical model for this system are established, which uses various refrigerants including R12,R22,R134a,R407C,R404A and R404A etc. The effect of different refrigerant,operating condition and ejecting coefficient is discussed. The results show that the COP rises with the increasing evaporator temperature and decreasing of condensate temperature, but the COP increases at first, and then reduces with the increase of ejecting coefficient. For R410A, the better operating condition is a condenser temperature 30℃, a evaporator temperature, a ejecting coefficient temperature or so 0.3. Ultimately, the performance of the new compression-eject refrigeration system and the conventional vapour compression refrigeration system is compared in two aspects of energy efficiency and exergy efficiency. It was found that for the working condition in the paper, the maximum increase of COP of new compression-eject refrigeration system is up to or so 20% comparing with conventional vapour compression refrigeration system and exergy efficiency is up to or so 23% comparing with conventional vapour compression refrigeration system. It is found that ejector can bring into play a great effect in the higher condensing temperature occasion and cryogenics water chiller occasion or ice thermal storage.