采用两种常见除湿剂的新型无霜空气源热泵系统模拟研究

Novel frostless air-source heat pump system simulation using two common desiccants

针对空气源热泵冬季结霜问题,构建了一款用无机盐溶液作为除湿剂的无霜空气源热泵系统,并应用Aspen plus建立了系统模型,对空气进口温度、进口相对湿度、气液比、溶液质量分数、冷凝温度5个因素构建了正交试验,分别采用氯化锂和溴化锂2种除湿剂进行模拟,将试验数据分别拟合成关于进口参数的经验公式。结果表明:在溶液入口水蒸气分压力一致的情况下,采用2种除湿剂的系统COP基本一致,除湿量变化曲线一致,但采用溴化锂溶液的系统除湿量比氯化锂溶液的高43%～66%,其气液吸热比也比后者高33.3%～54.3%。通过正交试验法分析得出最佳参数组合,并确定了性能因素影响程度的顺序。

Focusing on frosting problem of air-source heat pump in winter,sets up a novel frostless air-source heat pump system using mineral salt solution as desiccant and a system model by Aspen plus.Constructs an orthogonal experiment on five factors of inlet air temperature,inlet relative humidity,gas-liquid flow rate ratio,solution concentration and condensation temperature.Simulates the system operation using lithium chloride and lithium bromide as desiccants,respectively.Compares the dehumidification performance of two desiccants based on the formulas in the same conditions.Fits the empirical formulas for the inlet parameters from the experimental data.The results show that using the two desiccants,the COPs are basically the same under the consistent partial pressure of water vapor at the inlet of solution,the curve of moisture removal is consistent.But the dehumidification capacity of the system using lithium bromide solution is 43%to 66%higher than that of lithium chloride solution and its gas-liquid heat transfer ratio is 33.3%to 54.3%higher than that of the latter.Obtains the optimal parameter combination by orthogonal experimental analysis and determines the influence degree order of performance factors.