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8th Thermal and Fluids Engineering Conference (TFEC)
March, 26-29, 2023, College Park, MD, USA

STUDY ON SERIES INTEGRATED POWER-ABSORPTION REFRIGERATION SYSTEM WITH ADJUSTABLE CONCENTRATION AND SOURCE/SINK PRESSURE

Get access (open in a dialog) pages 619-628
DOI: 10.1615/TFEC2023.ens.046508

Abstract

A series integrated ammonia-water based power-absorption refrigeration system is proposed with adjustable concentration and source/sink pressure. The power sub-cycle in the series integration is placed on the downstream side of the absorption refrigeration sub-cycle by using separation/splitting assembly. This makes the power sub-cycle to operate at concentrations higher than its basic solution concentration which enhances the thermal match during heat exchange. The absorption refrigeration sub-cycle is operated by reusing the heat source which boosts the energy absorption tendency of the system. Internal heat recovery is also promoted to reduce the load on external heat source. To evaluate the performance of the series integration, an adjustable facility is proposed to modulate the system concentrations and source/sink pressure. The study broadly involves two important parameters namely the generator pressure fraction and split fraction whose variation regulates the outcome of the separation/splitting assembly and hence the performance of the system. It is found that some compromise have to be made in order to reduce the overall exergy destruction of the system and this compromise is less severe for lower generator pressure fraction and higher split fraction. For the base case with generator pressure fraction as 0.70, there is 3.40 kW reduction in overall exergy destruction with a compromise of 1.67 kW in power output, 0.13 kW in cooling output and 0.45% in resource utilization efficiency. The above result is for the variation of split fraction from 0.20 to 0.32.