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초록· 키워드

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A two-stage refrigeration system which cools an environmental test chamber down to -70℃ is numerically simulated to predict its steady state performance.
This refrigeration system employs R-502 on high stage and R-13 on low stage but semihermetic reciprocating compressors of the same type on both stages of it. On high stage it employs a CEV as an expansion valve and a finned coil type heat exchanger as a condenser, on the other hand, a CEV and a TEV connected in parallel as expansion valves, and finned coil type heat exchangers as an evaporator and a desuperheater on low stage. Both stages of refrigeration system are thermally coupled by a double tube type parallel flow intermediate heat exchanger.
In this thesis, the air temperature in the environmental test chamber, ambient air temperature where this chamber is located, and air mass flow rate through heat exchangers are considered as parameters, and then the effect of these parameters on the performance of this simulation model is discussed.
As a result, when chamber temperature in the range of -54℃ to -69℃ is decreased, power input, cooling capacity, refrigerant mass flow rate and COPs(Coefficient of performance) of high and low stages are decreased, and when flow rate of circulating air through the evaporator is increased, COP of the system is increased, but the change of air mass flow rate through the condenser does not affect the performance of the system. Upon using the desuperheater, refrigeration load of the high stage may be reduced.

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ABSTRACT

Ⅰ. 서론

Ⅱ. 2원냉동장치의 모델설정

Ⅲ. 결과 및 고찰

Ⅳ. 결론

Ⅴ. 참고문헌

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UCI(KEPA) : I410-ECN-0101-2009-553-015451219