Research On The Solar Energy Air-Cooled Ejection Refrigeration System

Current situation of solar power ejection refrigeration system was introduced. The solar energy air-cooled ejection refrigeration system which is a new refrigeration system drove by solar energy is established. Air-cooled was used in this ejection refrigeration system. Physical and mathematical model were set up to analyze the working process of the system. The performance of ejectors, as well as COP of system, was studied when refrigerant and operating condition change. Four kinds of refrigerants which including R141b,R134a,R123 and R22 were researched in the system. And the operating condition which is called "i" is the degree of allotting the full compress ratio. "i" was defined as: the first-level compress ratio divided by the second-level compress ratio. The relationship between "i" and COP was found on the four kinds of refrigerants. A new method of apportioning the full compress ratio to get the biggest COP has been proposed. And the best numerical value of "i" is different when the full compress ratio is bigger or smaller than 5.5: it is at the range of 1.1～1.2 when the full compress ratio is smaller than 5.5 and is at 1.4 when the full compress ratio is bigger than 5.5. The entrainment ratio of ejectors is reduced when the compress ratio is increased. The degree of influence between entrainment ratio and compress ratio is different when the refrigerant is changed. And the strength of effect is compared on the four sorts of refrigerants. Summarization and prospect of researching solar energy air-cooled ejection refrigeration system have been showed at the end of the thesis.