Experimental Study on Performance of Liquid Desiccant Air Conditioning System with Precooling Dehumidification/Preheating Regeneration
In this paper,a novel precooled and preheated dehumidification air conditioning system is proposed.This system utilizes the low-grade thermal energy from a heat pump for solution preprocessing and employs a solution characterized by a temperature of 18℃and a concentration of 27%for dehumidification.Experimental investigations are conducted to assess the effects of precooling/preheating the dehumidification/regeneration liquid on the dehumidification/regeneration performance of the system.Additionally,the system's comprehensive performance alterations post the implementation of a low-temperature and low-concentration solution are evaluated.Key findings include:(1)An decrease in temperature of the liquid desiccant after precooling results in a 16.3%rise in difference in air moisture content and a 6.4%enhancement in dehumidification efficiency.Concurrently,an escalation in the solution flow rate leads to a 22%and 20%increase in the difference in air moisture content and dehumidification efficiency,respectively.(2)An elevation in temperature of the regeneration solution increases after preheating causes the regeneration amount to surge from 0.132 g/s to 0.414 g/s,and the regeneration thermal efficiency to augment from 0.196 to 0.397.An increase in the inlet solution flow rate of the regenerator results in nearly a 13%rise in the regeneration amount of the solution and approximately 6%enhancement in regeneration thermal efficiency.(3)Relative to high-concentration solutions at ambient conditions,the dehumidification capability of the system remains largely consistent post the adoption of low-temperature and low-concentration solutions.There is a noticeable increase in the temperature differential of the air pre and post-dehumidification,which couples with a marked reduction in the operating cost.These findings provide a feasible solution for improving the overall performance of solution dehumidification systems in high-temperature and high humidity areas.
solution dehumidification air conditioning systemprecooling dehumidificationpreheating regenerationheat pumplow-concentration solution
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维普
