Abstract
AbstractThis research presents an improved design of a solar adsorption refrigeration system with certain specifications and requirements. In the traditional simulation of the performance of the solar adsorption refrigeration, the constant permeability and thermal conductivity were always selected for the establishment for the mathematic model. Latest research revealed that the permeability and thermal conductivity vary appreciably in the processes of adsorption and desorption, which indicates the consequential adsorption refrigeration performance will likewise be affected. The varying permeability and thermal conductivity in the CaCl2 and BaCl2 adsorption processes were tested, and the two-stage adsorption refrigeration system using CaCl2–BaCl2–NH3 as working pair was simulated to evaluate the effect of varying adsorbents’ permeability and thermal conductivity on the refrigeration system adsorption performance. The variable thermal conductivity and permeability simulation findings are compared to the constant thermal conductivity and permeability simulation results, as well as the experimental data. According to the results obtained, the greatest relative error between the simulation result with variable characteristics and the actual result is 8.3% for cooling capacity, 9.1% for SCP and 12% for COP, while the maximum relative error between the simulation result with constant properties and the experimental result is as high as 41.4% for cooling capacity, 42.8% for SCP and 36% for COP. This finding shows that variable characteristics have a major impact on simulation results and should be explored first before developing mathematical models for chemical and solar adsorption refrigeration systems.KeywordsTwo-stage adsorption refrigerationSimulationThermal conductivityPermeabilityCalcium chlorideBarium chloride
Published Version
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