Abstract
The widespread use of compression refrigeration in modern society is an example of a societal need that was unheard of two centuries ago. Ancient civilizations developed and flourished in hot climates without any widespread use of methods to provide more comfortable conditions. Modern society now considers it virtually a constitution right to have air conditioning in all homes, schools, office buildings and transportation vehicles. Modern food industries are dependent on refrigeration for preservation and distribution of many food products.This paper descripts an experimental laboratory compression refrigeration unit and presents quantitative dynamic simulations to show the effectiveness of a proposed control structure. Two conventional PI controllers control the amount of superheat and the refrigeration load by manipulating refrigerant flowrate and compressor power. The novel contribution of this paper is a quantitative exploration of the important engineering trade-off between safety and operating cost in compression refrigeration systems with superheat.
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