压缩机排气显热驱动的溶液除湿系统节能特性研究  

Study on Energy Saving Features of Solution Dehumidification System Driven by Compressor Discharge Sensible Heat

作　　者：张骞 张光玉[1] Zhang Qian;Zhang Guangyu(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou Zhejiang 310018)

机构地区：[1]浙江理工大学建筑工程学院,浙江杭州310018

出　　处：《中外能源》2024年第11期95-104,共10页Sino-Global Energy

摘　　要：利用空调压缩机高温排气显热驱动液体除湿系统,不仅可以降低排气过热程度,改善制冷机组运行工况,还可以有效利用排气余热制冷、除湿,降低空调冷负荷,具有双重节能效应。基于常用的LiCl除湿溶液,设计了一种利用压缩机排气显热驱动的溶液除湿系统,明确压缩机排气热量的计算方法,建立LiCl溶液除湿与再生循环的物质和能量平衡计算模型,并对影响该系统节能率的各种参数进行分析。影响节能率的主要因素有室外环境温湿度、制冷机组运行工况、LiCl溶液流量、除湿器入口溶液温度、再生器和除湿器的热质交换系数与气液比、回热器的热交换系数等。分析结果表明,适当降低室外温湿度(处理回风)或提高室外温湿度(处理新风)、降低蒸发温度和等熵效率、提高冷凝温度、优化LiCl溶液与制冷剂流量之比和除湿器入口溶液温度、提高热质交换系数和气液比、提高回热器效率,都有利于提高节能率。在不同城市采用该方案,处理回风的节能率在10%~15%之间,处理新风的节能率在10%~20%之间,其中,夏热冬冷与夏热冬暖地区处理新风时的节能率可达20%左右。Using the compressor discharge sensible heat to drive solution dehumidification system can not only reduce the degree of discharge superheat and improve the operating conditions of refrigeration unit,but also effectively utilize the discharge waste heat for cooling and dehumidification and reduce the air conditioning cooling load,achieving a dual energy-saving effect.Based on the commonly used LiCl dehumidification solution,a solution dehumidification system driven by compressor discharge sensible heat is designed,the method for calculating compressor discharge heat is defined,the material and energy balance calculation model for LiCl solution dehumidification and regeneration cycle is established,and various parameters affecting the energy saving rate of the system are analyzed.The main parameters affecting the energy saving rate include outdoor ambient temperature and humidity,operating conditions of refrigeration unit,LiCl solution flow rate,inlet solution temperature of dehumidifier,heat and mass transfer coefficients and air-liquid ratios of regenerator and dehumidifier,and the efficiency of heat recovery unit.The results show that appropriately lowering the outdoor temperature and humidity(for return air treatment)or increasing the outdoor temperature and humidity(for fresh air treatment),lowering the evaporation temperature and isentropic efficiency,increasing the condensing temperature,optimizing the ratio of LiCl solution flow rate to refrigerant flow rate and the inlet solution temperature of dehumidifier,increasing the heat and mass transfer coefficients and air-liquid ratios,and improving the efficiency of heat recovery unit are all beneficial for enhancing energy savings.When applying this scheme in different cities,the energy saving rate for return air treatment is between 10%and 15%,while for fresh air treatment,it is between 10%and 20%.In hot summer and cold winter region and hot summer and warm winter region,the energy saving rate for fresh air treatment can reach around 20%.

关 键 词：排气显热 溶液除湿 室外温湿度 热质交换系数 溶液流量 节能率 

分 类 号：TU834.9[建筑科学—供热、供燃气、通风及空调工程]