热泵型溶液除湿新风系统性能分析与优化

本文建立了热泵型溶液除湿(HPLD)新风系统数学模型,研究了新风温度、湿度对系统运行性能的影响。结果表明:新风温度升高1℃,系统COP平均下降率为0. 9%;新风含湿量增加1 g/(kg干空气),系统COP平均下降率为3. 6%,新风湿度增加导致HPLD系统COP大幅下降,系统新风湿度变化的适应性差。为扩大HPLD系统适应范围,提出了冷却除湿与HPLD组合式除湿系统,以组合式除湿系统COP为评价指标,得到组合系统级间新风参数最优状态:温度为21℃,含湿量为14. 1 g/(kg干空气)。夏季典型工况下,组合式除湿系统COP为5. 40,比单一HPLD系统COP提高87. 5%。最后,根据HPLD系统设计参数制作了实验样机,并对模拟结果进行了验证。

Performance Analysis and Optimization of Heat Pump Driven Liquid Desiccant Fresh Air System

A mathematical model of heat pump driven liquid desiccant(HPLD)fresh air system was established to investigate the system′s performance under different fresh air parameters.The results indicated that the fresh air temperature increased by 1℃,the average decline rate of the system′s coefficient of performance(COP)was 0.9%,however,when the fresh air moisture content increased by 1 g/(kg·dry air),the average decline rate of COP was 3.6%.The increase in air moisture content caused a significant reduction in COP,whereas the HPLD system had poor adaptability to changes in fresh air humidity.In order to expand the range of the HPLD system′s adaptation,a dehumidification system combined with HPLD and cooling dehumidification was proposed.Taking the combined dehumidification system of COP as the evaluation index,the optimal state of the fresh air parameters between the combined dehumidification systems was obtained:the temperature was 21℃,and the moisture content was 14.1 g/(kg·dry air).Under typical summer conditions,the COP of the combined dehumidification system was 5.40,which was 87.5%higher than that of a single HPLD system.Finally,an experimental prototype was built according to the design parameters,and simulation results were verified.