Find out how to build one here!!!!!
The idea of using an open flame or concentrated solar heat to make ice or to cool an insulated box is not new, but little information is available on how to actually accomplish this feat. Prior to the availability of cheap electricity, many of these small ammonia based "Icy Ball" refrigeration units could be found in homes in the United States. Over the last 30 years several experimental units have been constructed for the purpose of laboratory testing. These units were custom made by the experimenters and could not be easily replicated.
Now for the first time simple plans are available which will allow a moderately skilled handyman to construct a practical, low cost, portable absorption refrigeration unit.
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