Technical Writing


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If you own a cabin or a recreational vehicle you may already be familiar with the gas-operated refrigerator. Science has enabled the public to achieve refrigeration without the use of electricity. This can be invaluable in more rustic situations. Gas refrigerators are not feasibly repairable on site, but are usually built for longevity. Since one of the main reactions in the cycle of cooling involves ammonia absorption, the refrigerator is sometimes referred to as an absorption refrigerator. The purpose of this piece is to inform the reader about the molecular reactions that create cold in a gas refrigerator, and the parts creating these reactions. Gas fuel is the source of energy used to trigger the process.  Heat initiates a chemical reaction that ultimately results in the absorption of liquid ammonia into a newly formed gas. This refrigerator discussed here, unlike an electric unit, has no parts that move at all. Refrigeration is achieved through means of heating and condensing of ammonia with water and ammonia with hydrogen. A gas flame is used to heat a mixture that creates a chemical reaction resulting in liquid ammonia’s evaporation, which creates cold. The refrigerator is built in a way that a continuous cycle results. As long as gas fuel is present to fire the burner, the process is self-contained. This aspect is the reason they are still used today in situations where electricity is not readily available. The following will explain in detail both the molecular and mechanical processes that result in the cooling of a gas refrigerator.


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