Abstract
Abstract R134a–DMAC vapour absorption refrigeration system (VARS) needs rectifier. Because of incomplete rectification, a small amount of DMAC is carried to evaporator. It results in a temperature gradient and also formation of residual liquid in the evaporator. This liquid causes cooling loss which can be recovered significantly by using liquid vapour heat exchanger (LVHX). The same cooling temperature can be attained at a range of evaporator pressures due to the temperature gradient. For fixed cooling temperature, the system COP enhances with evaporator pressure. The enhancement rate is more when efficiencies of rectifier and LVHX are high. Efficient solution heat exchanger (SHX) is vital owing to its large heat duty. Rectifier loses its importance if high efficiency LVHX is used. Roles of these three components increase at low cooling and high sink temperatures.
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