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nottwo | 13 years ago
This paper presents some of the experimental evaluations of a prototype solar refrigerator, based on an intermittent thermodynamic cycle of adsorption, using water as refrigerant and the mineral zeolite as adsorber. This system uses a mobile adsorber, which is regenerated out of the refrigeration cycle and no condenser is applied, because the solar regeneration is made in the ambient air For the regeneration, a SK14 solar cooker is considered. The cold chamber, with a capacity of 44 liters, is aimed for food and vaccine conservation. The objective is to analyze the advantages and disadvantages of the eventual use of this refrigerator in rural regions of Peru, where no electricity is available. On the bases of the results obtained, a new prototype of refrigerator for rural regions is designed, based on the same thermodynamic cycle, but including changes in design and operation.
http://fc.uni.edu.pe/mhorn/ISES2003%20(solar%20refrigeration...
During the day, solar energy is used to drive water out of the zeolite. The dry zeolite is exposed to water under low-pressure causing the water to evaporate and be adsorbed into the zeolite. The evaporative cooling can be used to refrigerate food without electricity.
A German company with various zeolite refrigeration applications:
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