Exergetic Investigation of the Effects of Superheating and Subcooling on Performance of a Vapor Compression Refrigeration Cycle

Karaçaylı İ., Şimşek E.

European Mechanical Science, cilt.4, sa.4, ss.152-157, 2020 (Diğer Kurumların Hakemli Dergileri)

  • Cilt numarası: 4 Konu: 4
  • Basım Tarihi: 2020
  • Doi Numarası: 10.26701/ems.742973
  • Dergi Adı: European Mechanical Science
  • Sayfa Sayıları: ss.152-157

Özet

Abstract

The aim of this study is to investigate the effects of superheating and subcooling values on the cooling performance of a vapor compression refrigeration cycle. For this purpose, a refrigeration cycle with cooling capacity of 8 kW using R404A was examined by changing superheating and subcooling values. Energy, exergy and entropy balances were applied for evaporation and condensation temperatures of 0℃ and 45℃, respectively. The coefficient of cooling performance (COP), the amount of energy transfer, rate of exergy destruction and rational exergy efficiency of each components (evaporator, compressor, condenser and expansion valve) and the whole system were determined. The compressor work, coefficient of performance and second law efficiency increased by 0.7%, 1.61% and 1.56%, respectively, per one-degree increment of superheating in the evaporator.