Study on Conceptual Design of a Solar Ejector Refrigeration System

Abstract

The refrigeration system based on the conventional compression cycle consumes an enormous amount of high-grade energy. Using fossil fuels as the energy sources results in the addition of CO2 into the atmosphere and consequently stimulating higher greenhouse effect. The ejector refrigeration systems powered by renewable energy sources would be an effective alternative without increasing global CO2 footprint. In this study, the performance characteristics of a solar ejector refrigeration system working with R718 are analytically calculated by using a one-dimensional flow model. At the critical mode, the solar ejector-refrigeration system is analyzed at various working conditions such as condenser temperature, evaporator temperature, generator temperature, and ejector area ratio. The critical system performance is analyzed to meet any designated working conditions with a wide range of condenser temperatures. It is found that during the critical mode of operation, higher area ratio, higher evaporator temperature and lower generator temperature enhance the performance of the system. The minimum evaporator temperature, and the maximum generator temperature designed to acquire the required coefficient of performance value are also calculated.

Effects of Nozzle Exit Position on Condenser Outlet Split Ejector-Based R600a Household Refrigeration Cycle

“…Ejectors have attracted significant attention as a method for reducing these expansion losses. A two-phase ejector cycle is considered one of the most effective expansion methods for improving the energy efficiency of the refrigeration cycle through a reduction in the expansion loss [11]; it has been widely applied in high-pressure and high-capacity refrigeration cycles that suffer from significant expansion losses, such as the transcritical cycle [12][13][14][15]. He et al [16] analyzed the exergetic efficiency in a transcritical CO 2 cycle using computational fluid dynamics (CFD).…”