Photovoltaic-powered vaccine refrigerator - freezer systems field test results. Revision

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Abstract
In 1979 the NASA Lewis Research Center, in cooperation with the US Centers for Disease Control and the US Department of Energy, began a project to develop and field test photovoltaic-powered refrigerator/freezers suitable for vaccine storage. Development contracts were awarded to Solar Power Corp. and Solavolt International. Three refrigerator/freezers were qualified; one by Solar Power Corp. and two by Solavolt. Follow-on contracts were awarded to Solar Power Corp. for 19 field test systems and to Solavolt for 10 field test systems. The US Agency for International Development joined in the field tests systems effort. A total of 29 systems were installed in 24 countries between October 1981 and October 1984. This report includes an explanation of the project, systems descriptions, installation experiences, performance data for the 22 systems for which field test data was reported, an operational reliability summary, and recommendations relative to system designs and future use of such systems. Performance data indicate that the systems are highly reliable and are capable of maintaining proper vaccine storage temperatures in a wide range of climatological and user environments.

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