KAJIAN SIMULASI PENGARUH SUBCOOLED DAN SUPERHEATED PADA SISTEM REFRIGERASI KOMPRESI UAP DENGAN R22 DAN R32

  • Muhammad Arman
  • Windy Hermawan Mitrakusuma
  • Sri Murniati
  • Cynthia Andini S.Y
Keywords: Subcooled, Superheated, REFPROP, Isentropic Efficiency

Abstract

Subcooled and superheated are one of the more complicated refrigeration cycle processes. Subcooled is a process that occurs because the heat dissipation in the condenser runs smoothly so that the phase change in the refrigerant at the end of the condenser is a mixture of liquid and gas. Superheated occurs when the system is deficient in refrigerant, causing the refrigerant to come out of the evaporator to be completely gaseous. To determine the consequences of the subcooled and superheated processes, various methods can be used, such as conducting experiments using tools directly and performing simulations using a program. In this final project, the simulation method is used because it is easier than using a direct tool. The refrigerants used were refrigerants R22 and R32 by varying the values ​​of subcooled, superheat, and isentropic efficiency under the specified conditions. The values ​​of subcooled temperature and superheated temperature were varied at 0 K, 3 K, 5 K, 7 K, 9 K, and 11K. Isentropic efficiency was varied at 50%, 75%, and 100%. This simulation data processing uses the REFPROP (Reference fluid Properties) program which can calculate the thermodynamic properties of the fluid and can be accessed with the Microsoft Excel add-ins. After performing the simulation, it can be concluded that if a subcooled process occurs in the system, the COP value will increase by 2.5%. Conversely, if there is a superheating process, the COP value will decrease by 0.3% and the compressor work will increase by 1.7%. Furthermore, in the simulation of variation in isentropic efficiency when the efficiency is at 50%, the resulting COP value is 50% lower and the compressor work released is 50% higher so that the required compressor power is 75% greater than the 100% efficiency. It can be said that the system works better if there is an increase in subcooled temperature and 100% isentropic efficiency.

Published
2021-04-19
Section
Articles