Abstract
In this study, the first and second laws of thermodynamics are used to analyze the performance of a single-stage absorption refrigeration system powered by solar energy. The working pair used in this study is LiBr-H2O where water (H2O) is the refrigerant and the lithium bromide (LiBr) is the absorbent. A mathematical model based on exergy analysis is applied to analyse the system performance. Temperature, enthalpy, entropy, mass flow rate and exergy loss of each component including evacuated tube solar collector are evaluated. Furthermore, the overall coefficient of performance (COPcooling) and the overall exergetic coefficient of performance (ECOPcooling) of the solar absorption system (absorption system coupled to an evacuated tube solar collector) for cooling purpose are calculated from the thermodynamic properties of the working fluids under weather conditions of Ngaoundere city, Cameroon. The calculations were done on the basis of a half hourly analysis from 6:30 AM to 6:30 PM. The results were compared and they show that the exergy destruction highly occurs in the generator and the solar collector. The simulation results can be used for the thermodynamics optimization of solar absorption refrigeration systems.
Highlights
The need of refresh air or refrigeration is becoming more and more important in the daily activities nowadays
The overall coefficient of performance (COPcooling) and the overall exergetic coefficient of performance (ECOPcooling) of the solar absorption system for cooling purpose are calculated from the thermodynamic properties of the working fluids under weather conditions of Ngaoundere city, Cameroon
In order to improve the performance of a solar absorption refrigeration system, many optimization studies based on the energy analysis have been done
Summary
The need of refresh air or refrigeration is becoming more and more important in the daily activities nowadays. In Africa, people have the opportunity to contribute to the protection of the environment by fighting against global warming This can be done through the use of renewable energy sources such as solar, wind, geothermal, wasted heat and so on. In order to improve the performance of a solar absorption refrigeration system, many optimization studies based on the energy analysis have been done. In Ravikumar et al [4] study, exergy analysis of a double-effect solar assisted absorption system is carried out and influence of generator I, generator II temperatures on exergy values is shown. Their work focused on the aim at the Solar Assisted Absorption Refrigeration Systems (SAARS) and various environment conditions, exergy loss of each component was calculated separately. The coefficient of performance (COP) and the exergetic coefficient of performance (ECOP) of the system are investigated
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