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Activated Carbon/Refrigerant Combinations for Solar Refrigeration Application
Abstract
Experimental study of three adsorbent/adsorbate combinations for use in adsorption refrigerators is presented. Activated carbon is the adsorbent while ammonia, ethanol and methanol are the adsorbate. The pressure-temperature-concentration (P-T-X) diagrams of the different combinations are also presented. From the results, the coefficient of performance (COP) of the ideal refrigeration cycle within the ranges applicable to solar adsorption refrigeration machines are estimated. It was found that it is possible to use all the combinations in adsorption refrigerator. However, while activated carbon/methanol is preferred at low grade heat, activated carbon/ammonia requires the use of advanced flat-plate collectors such as those with multiple glazing and/or selectively coated collector plates to be powered by solar energy.
