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溶液调湿空调中常用除湿剂的物性分析

发表时间:2009-01-31  浏览量:2577  下载量:1181
全部作者: 易晓勤,刘晓华,江亿
作者单位: 清华大学建筑技术科学系
摘 要: 溴化锂、氯化锂和氯化钙溶液是目前在溶液调湿空调中应用较广泛的除湿剂。除湿剂的表面蒸气压、结晶线、比热容、密度和粘度是影响溶液调湿空调系统性能的重要物理参数。本文整理了这3种常用除湿溶液的物性数据及拟合公式,并进一步分析了它们的性质对溶液调湿空调系统性能的影响,其结果表明:氯化钙溶液容易结晶,处理的空气范围有限,比热容较小,过程中温升明显,且密度和粘度也较大,性能劣于氯化锂溶液和溴化锂溶液;对于溴化锂溶液和氯化锂溶液,当除湿负荷相同时,要求的氯化锂溶液浓度低于溴化锂溶液;在吸湿过程中,氯化锂溶液吸收相等潜热时的温升较小,吸湿能力更稳定;密度和粘度方面,两者各具优势。综合来看,溴化锂溶液和氯化锂溶液都是适用于溶液调湿空调的优秀吸湿剂。
关 键 词: 供热、供燃气、通风与空调工程;除湿溶液;表面蒸气压;结晶线;比热容
Title: Analysis on thermodynamic properties of liquid desiccant in liquid desiccant air conditioning system
Author: YI Xiaoqin, LIU Xiaohua, JIANG Yi
Organization: Department of Building Science, Tsinghua University
Abstract: LiBr, LiCl and CaCl2 are three kinds of liquid desiccant which are widely used in liquid desiccant air conditioning system at present. For those desiccants, surface vapor pressure, solubility boundary, specific thermal capacity, density and viscosity are the most important properties which affect the performance of liquid desiccant air conditioning system. This paper summarizes experimental data and calculation formulations of the three kinds of desiccants based on the review of a lot of literature. Furthermore, the paper also analyzes the impact of thermal properties of the three salt solutions on performance of liquid desiccant air conditioning system. In a comprehensive view, compared with the other two solutions, CaCl2 solution is easier to crystallize, which results in a limited handled air state range, smaller specific thermal capacity which brings on evident temperature rise in dehumidification process, and larger density and viscosity, so the performance of CaCl2 solution is worse than that of LiCl and LiBr solution in liquid desiccant air conditioning system. For LiCl and LiBr solution, when dehumidification load is the same, desired concentration of LiCl is less than that of LiBr, and when solutions absorb equal moisture, temperature rise in LiCl solution is less than that in LiBr solution, so dehumidification ability of LiCl solution is more stable. In density and viscosity, each of the two solutions has its strong points. In a word, LiCl and LiBr solution are two kinds of suitable liquid desiccant for liquid desiccant air conditioning system.
Key words: heating, gas supply, ventilation and air conditioning engineering; liquid desiccant; surface vapor pressure; solubility boundary; specific thermal capacity
发表期数: 2009年1月第2期
引用格式: 易晓勤,刘晓华,江亿. 溶液调湿空调中常用除湿剂的物性分析[J]. 中国科技论文在线精品论文,2009,2(2):114-119.
 
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