Modelling and simulation of solar assisted vapour absorption refrigeration system in TRNSYS

Abstract

The need for effective and sustainable refrigeration technologies has intensified as as a consequence of the growing need for thermal comfort across globe and the continuing increase in Earth's ambient temperatures. In this study, TRNSYS software is used to develop and simulate a solar-powered vapour absorption refrigeration (VAR) system that is tailored to the environment of Karachi, Pakistan.  The four-month simulation runs from April to July and replicates seasonal shifts in solar energy availability and system performance. The impact of important operating parameters, such as mass flow rate and chilled water temperature, on the system's coefficient of performance (COP) is evaluated using a thorough parametric investigation. The findings show that, in line with seasonal trends in solar intensity, collector temperature and heat gain peak in April and subsequently begin to decline by July. A chilled water temperature of 16°C and a mass flow rate of 0.4 kg/s yields the highest coefficient of performance (COP), whereas 10°C and 0.25 kg/s yield the lowest COP. Moreover, a decrease in the cooling water mass flow rate leads to a higher outlet temperature, whereas an increase in the cooling water inlet temperature causes the COP to decrease. These results offer important novel knowledge about the optimum parameters for operation to further enhance effectiveness and efficiency of solar-powered absorption refrigeration systems in local climates.