DEVELOPMENT OF SOFTWARE AND THERMODYNAMIC ANALYSIS FOR EJECTOR REFRIGERATION CYCLES

• Main Author: AKHMAD FAUZI (NIM : 13104110); Pembimbing : Dr. Ir. I Made Astina, M.Eng.
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/14768
• Institution: Institut Teknologi Bandung

Ejector-refrigeration cycle can utilize low grade waste heat and solar radiation so that it plays important role on reducing CO2 emission in the environment. Simple installation and maintenance makes it to be interesting to be developed in Indonesia. Any research of ejector-refrigeration cycle shows that the coefficient of performance is still lower compared to vapour compression refrigeration cycle. <br /> <br /> <br /> One dimensional ideal-gas analysis needs to be corrected by using accurate method. In this research, real-fluid approach method is applied supported by accurate thermodynamic equation of state. Real-fluid analysis formulation was proposed by involving the theoretical mass, momentum, and energy balances. Verification is conducted by comparing the theoretical analysis result respect to experimental result from other researcher. In order to increase the coefficient of performance, regenerative heat exchanger is used to modify conventional ejector refrigeration cycle. The coefficient of performance can also be increased by choosing suitable refrigerants. Refrigerants which was simulated in this research are R-141b, R-600, R-600a, R-134a, R-152a, and R-290. A software was developed to support this research. <br /> <br /> <br /> Based on verification of real-fluid approach analysis respect to experimental result, it points out that the deviation is -10% to 10% for entrainment ratio. Deviation of condenser temperature calculation respect to experimental result is in range -5% to 15%. Simulation of ejector refrigeration cycle with one heat exchanger results in increasing coefficient of performance 2%-12% depend on operating condition and refrigerants used. Ejector refrigeration cycle with two heat exchangers can increase the coefficient of performance 8%-25%. Isobutane is a suitable refrigerant for the ejector refrigeration cycle especially at high generator temperature, because the efficiency is higher than other refrigerants.