Gas Powered Liquid Recirculation Compared to Mechanical Pump
Gas Powered Liquid Recirculation Compared to Mechanical Pumps (1990)-The intent of this paper is to present a simplified mathematical model used to analyze the energy required to operate a Constant Pressure Liquid recirculation system. The basis for the analysis presented here grew out of an actual system design, in which there was both a 120 ton two-stage, -40F load, and a 75 ton, single stage, 0.F load. The design criteria for each type of recirculation system will be explained separately, and the calculation procedures clearly defined. The analysis has been expanded to include two other common suction temperatures, -20F two stage and +20F single stage. All the energy calculations have been normalized to a "per-100-ton" basis for convenient reference. Besides comparing operating energy with that of a pump, the analysis reveals some critical observations that result in a list of recommendations for design and operation of an efficient Constant Pressure Liquid recirculation system.
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