The Effect of Condenserfluid Quality on the Performance of a Vapour Compression Refrigeration Cycle 'A Simulation Model Approach'

摘要

The paper investigated the effect of incomplete condensation / condenser fluid quality on the performance of vapour compression refrigeration cycles. Simulation model was developed using ASPEN HYSYS version 7.1 to determine the relationship between condensers fluid quality and some refrigeration system performance parameters such as compressor duty, cooling effect (CE) and the ratio of cooling effect and compressor duty for a simple propane pre cooled loop. The simulation was carried out at condensa tion temperature range of 0 to 60 and fluid quality reduction interval of 5% using three different condensers of capacities 300mj/hr, 500mj/hr and 700mj/hr respectively and plant process data obtained from an LNG facility in Nigeria. The analysis of the results shows that decrease in the condensers fluid quality (increase in the degree of incomplete condensation) leads to decrease in the performance of a vapor compression refrigeration system and an increase in the condenser fluid quality leads to increase in the performance of the system and the fluid quality failure point of the systemis dependent on the condensation temperature but independent on the size or heat capacity of the conden ser.Hence at condensation temperatures of 0 ,40 and 60 , the fluid quality failure points are 7%, 14%, 22% and 31% respectively irrespective of the size or heat capacity of the condenser.