Volume No. 12 Issue No.: 02 Page No.: 149-156 Oct.-Dec. 2017

 

EFFECT OF USING DEDICATED SUBCOOLER ON THE PERFORMANCE OF VAPOUR COMPRESSION REFRIGERATION SYSTEM

 

Roy Ranendra* and Mandal Bijan Kumar

Department of Mechanical Engineering, IIEST Shibpur, Howrah, West Bengal (INDIA)

 

Received on : August 25, 2017

 

ABSTRACT

 

Performance of a vapour compression refrigeration system can be improved by subcooling of condensed saturated liquid which permits the low quality refrigerant to absorb more heat from the refrigerated space in the evaporator. A performance enhancement model for a vapour compression refrigeration system by adding a small dedicated mechanical subcooler system to the main system has been developed to operate with comparatively large temperature difference between the evaporator and the condenser. Subcooler cycle provides subcooling to the main cycle refrigerant by absorbing heat from the condensed liquid of the main cycle refrigerant. R134a is chosen as main cycle refrigerant, whereas, R152a and R134a are separately considered as subcooler cycle refrigerants. Engineering Equation Solver (EES) has been used to analyze the performance of the system and compared with two different refrigerants in the subcooler cycle. It is found that the overall performance of the system is improved for using both R152a and R134a as subcooler cycle refrigerants. Results also depict that R152a shows slightly better performance compared to the R134a as the subcooler cycle refrigerant. Predicted results show that an optimal subcooler temperature exists for fixed condenser and evaporator temperature.

 

Keywords : Refrigeration, Dedicated Subcooler cycle, COP, R134a, R152a

 

 

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