本项目以研究具有优良热物理性质和低腐蚀性的新型吸收式热泵工质对为目的，对博士课题提出的LiNO3/H2O二元工质对进行优化。拟在LiNO3/H2O的基础上添加一定比例的烷基取代类离子液体（IL，ionic liquids），探索新型的LiNO3-IL/H2O三元工质对以提高吸收能力，降低结晶温度。系统地测定LiNO3-IL/H2O工质对的溶解度、饱和蒸气压、密度、运动黏度、比热容、热导率、表面张力、溶解热和比焓等热物性数据。通过对Li2MoO4等钼酸盐系无机缓蚀剂和2-巯基苯并咪唑等有机缓蚀剂进行复配研究，揭示pH值、温度、浓度和复配缓蚀剂对碳钢和紫铜腐蚀性的影响规律，确定最优的缓蚀条件，以降低LiNO3-IL/H2O对碳钢和紫铜的腐蚀性，从而满足高温热泵的应用要求。最后，基于TRNSYS软件对LiNO3-IL/H2O直燃型双效地源吸收式热泵系统进行模拟计算与分析。

This project will focuse on the optimization of LiNO3/H2O working fluid, which has been proposed in autor's phd thesis, for the purpose of developing an alternative working fluid with excellent thermophysical properties and low corrosion. Through adding certain proportion alkyl substituted ionic liquids (IL) to LiNO3/H2O binary system, a new ternary working fluid of LiNO3-IL/H2O will be put forward to enhance the absorption capacity and reudce the crystallization temperature for LiNO3/H2O. The solubility, vapor pressure, density, viscosity, specific heat capacity, thermal conductivity, surface tension, molar dissolution heat, and specific enthalpy of LiNO3-IL/H2O working fluid will be systematically measured. Through the study on the complex of molybdate inhibitors (Li2MoO4 etc.) and organic inhibitors (2-mercapto benzimidazole etc.), the effects mechanism of pH, temperature, concentration, and complex inhibitor on the corrosion rates of carbon steel and copper in LiNO3-IL/H2O working fluid will be obtained, and the optimal inhibition condition will also be determined so as to reduce the corrosion of LiNO3-IL/H2O to meet the appliation requirement of high-temperature absorption heat pump. Finally, the direct- fired double effect ground scource absorption heat pump system based on LiNO3-IL/H2O will be modeled and simulated by TRNSYS.