Share

An experimental investigation of a different type of vapour-compression cascade refrigeration system.

Author(s) : KILICARSLAN A.

Type of article: Article

Summary

This article describes an experimental investigation and theoretical study on a different type of two-stage vapour compression cascade refrigeration system using R134 as the refrigerant. Performance evaluations of two single stage vapour-compression systems and a two-stage vapour-compression refrigeration cascade system are performed with respect to theoretical model developed. In the first section of the experiments, one refrigeration system, namely RU2, is operated. During the experiments, the rate of the water flow connecting both systems is kept constant at various values and the voltage across evaporator heaters is increased from 100 to 200 V with intervals of 20 V. In the second part of the first category, experiments are repeated by using different mass flow rates of water. In the second section, two separate refrigeration systems, namely RU1 and RU2 are connected to each other by using the water loop. This system is also called cascade refrigeration system. It is observed that the change in water mass flow rate has little effect on the coefficient of performance for single stage and cascade stage refrigeration systems. It is also observed that the coefficient of performance is mainly a function of evaporator temperature and pressure. When RU2 operating in the single stage refrigeration system is compared with RU2 operating in the two-stage cascade refrigeration system at the same refrigeration load interval (360-460 W), the average percentage values of the decrease in the condensing pressure, the decrease in the compressor power and the increase in the COP are 21.9, 31.7 and 32.7, respectively.

Details

  • Original title: An experimental investigation of a different type of vapour-compression cascade refrigeration system.
  • Record ID : 2005-0669
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 24 - n. 17-18
  • Publication date: 2004/12

Links


See other articles in this issue (13)
See the source

Indexing