Theoretical Design Model for Vapour Compression Refrigeration Systems

摘要

In this study, a design model for vapour compression refrigeration systems was developed. The simulation model includes the four major components of the cycle- compressor, condenser, evaporator, and expansion device. In an attempt to predict the size of capillary tubes used in refrigeration systems and to provide a simple correlating equations for practicing engineers pressure drop through a capillary tube was modeled. Stoecker's and Jung et al's basic model were modified with the consideration of various effects due to subcooling, area contraction, different equations for viscosity and friction factors were considered. The developed model yielded performance data that are comparable to those in the ASHRAE handbook and other literature. The yielded performance data, compares favourable with the performance of an ideal refrigeration system under the following conditions: Condensing temperatures of 35, 40, 50, 55℃: Subcooling temperatures of 0, 2, 2.5, 3, 5℃, mass flow rates of: between 4 and 45 g/s, evaporating temperatures of: -10, -5, 0, 5, 10℃.