The Research Of Solar Adsorption Refrigerator Designing And Performance Optimization

The energy and environment issues are of significance for our human being tofurtherly develop. The traditional compression-type refrigerating system driven byelectric power, as the large energy-using product, will severely test the power supply.What’s more, it uses CFC, HCFC as the refrigerating fluids that are harmful to theozonosphere and give rise to the greenhouse effect. So it will be unallowed step bystep.The solar-energy-adsorbed refrigerating well combines solar power andadsorption refrigeration, which is “green” and “low carbon”, saves energy, protectsenvironment.The adsorbent-refrigerating fluid pair, refrigerating cycle device and intensifiedheat transmission(adsorption bed) are the three major fields for domestic and overseasresearches on adsorption refrigerating system. It is necessary to make mixed andcompound adsorbent added fixed proportion porous media and high-thermalconductive materials because of the poor heat conduction property and inflationagglomerate of pure adsorbent.This paper thermodynamically calculates and mathematically models the mainfunctions of solar energy refrigerating system based on the law of thermodynamics,then chooses the models of main system parts according to the environment andgeographic situation. The numerical simulation is taken in use of CFD, and theoutcoming analysis is optimized. So as to provide the theoretical basis for selectingmodels of critical component on test-bed.It is discovered, after the heat conduction test of mixed adsorbent made byimmersing expanded graphite into different ratio calcium chloride solution, that theheat conduction index of mixed adsorbent is3W/(m·K),60times improved than purecalcium chloride, after added graphite. By the way of mathematic simulation calculation, the time for the mixed adsorbent reaching steadystate after improvementreduces by2000s and the temperature increases by almost17℃. The plate-type heatexchanger is selected to design and figure out the condenser, and the improvedparameter: when it’s0.022m/s at the entrance, the rate at exit after heat exchange onsingle side would get95%, goes as initial value in the simulation analysis. Theimproved trench-type solar energy collector gives the experimrnt stable heat, in whichthe temperature could be100℃when the sunshine is abundant at noon in summer,Qing dao.Finally, the conclusion about optimization of solar energy adsorptionrefrigeration is drawn. The thesis gives the direction of future research.