engleski

Compressor Speed, Expansion Valve Opening and Refrigerant Charge Influences on the Propane Unit Design

This research involves the development of a computational tool for the design of a vapor- compression liquid-cooled chiller unit. It is suitable for the analysis of the unit design. The calculation tool was developed as a steady-state model with the following boundary conditions: compressor design and displacement, expansion valve nominal capacity, inlet temperatures and flow rates of the two secondary heat transfer fluids in the evaporator and condenser. The tool is designed to provide a better analysis of the thermodynamic process of compression refrigeration systems than using estimated condensing and evaporating temperatures for process analysis. The mathematical model is able to compare the application of different refrigerants and components of the refrigeration system. The model was developed as a numerical tool using the Engineering Equation Solver (EES), which includes a detailed model of the compression process and energy balance of the compressor, a model of the expansion valve to predict valve opening, and full correlations of heat transfer and pressure losses in all heat exchangers of the refrigeration cycle. The simulation model is validated with specific steady state experimental tests performed on a propane refrigeration machine. The case study is conducted to analyze the effects of refrigerant charge, subcooling level, and expansion valve openings on the performance of the propane unit.

computational tool ; Propane R290 ; chiller ; refrigerant charge ; propane cooling unit design

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