Experimental Study of Novel Linear Compressor in Refrigeration System

Abstract

This study investigates the performance of linear compressor used in vapour compressor refrigeration systems (VCRS). Conventionally, crank-drive reciprocating compressors or rotary compressors are used in VCRS, but the study deals with the innovative Linear compressor, which has been found to pose many merits in comparison to conventional ones. The objective of this research is to provide a comprehensive understanding of the system's performance characteristics from various perspectives, ultimately contributing to the enhancement of future VCRS designs. The experimental test rig has been meticulously designed and developed, utilizing a simple VCRS that incorporates both a crank drive reciprocating compressor and a spring-based linear compressor. A solenoid valve facilitates the operation of one compressor at a time. The performance of this experimental setup was assessed by varying the air flow speed of the fan mounted on the evaporator, ranging from 1 m/s to 2.5 m/s in increments of 0.5 m/s. Also, the observations were made at different ambient conditions. Performance evaluation was conducted based on key parameters, including power consumption, cooling capacity and the Coefficient of Performance (COP). The refrigerant considered for analysis in this study is R600a, which is used in both crank drive and linear compressors. The experimental results indicate the relative advantages and disadvantages of the spring-based linear compressor over the crank-drive compressor. With a redesigned configuration, it is expected that the linear compressor's overall performance could be further improved.