New Working Medium-Absorbent System for Absorption Heat Pump

本研究旨在检验甲醇-溴化锂氯化锌系统是否适用于吸收式制冷机、吸收式热泵和吸收式热变压器。通过测定样品溶液的结晶温度，确定了硼化锂与氯化锌的最佳混合比例。溴化锂和氯化锌的最适宜掺量分别为1.0和1.0。测定了甲基溴化锂-氯化锌体系的热性能（热容量和混合热）和物理性能（密度、粘度、表面张力、溶解度和蒸气压）。在不同温度和吸收剂浓度下进行了密度、粘度、表面张力、蒸汽压和热容量的测量。溶解度在265.85 ~ 343.35K范围内得到。在298.15K时的混合热为吸收浓度在0 ~ 65.8%之间的溶液。根据实验数据得到了溶解度、蒸汽压、热容和混合热的经验公式。在这些观测数据的基础上，构建了该三组分体系的焓浓度图。通过性能系数的理论分析，考察了该三组分系统的性能特点。利用焓浓度图计算了吸收式制冷机、吸收式热泵和吸收式热变压器的性能系数。将该三组分体系的性能特征与水-溴化锂体系以及以水、甲醇、R22和氨为工质的其他体系进行了比较。该三组分系统适用于风冷式单级吸收式制冷机、单级吸收式热泵和单级吸收式热变压器。少

This investigation was undertaken to examine whether the methanol-lithium bromidezinc chloride system is suited for absorption refrigerating machines, absorption heat pumps, and absorption heat transformers. The optimum mixing ratio of lithium bormide and zinc chloride was determined by measuring the crystallization temperatures of sample solutions. The most suitable mixing ratio of lithium bromide and zinc chloride was 1.0 weight and 1.0 weight, respectively. The thermal properties (heat capacity and heat of mixing ) and physical properties (density, viscosity, surface tension,solubility, and vapor pressure ) of the methnol-lithium bromide-zinc chloride system were measured. The measurements of density, viscosity, surface tension, vapor pressure, and heat capacity were carried out at various temperatures and absorbent concentrations. Solubilities were obtained in the range of temperatures from 265.85K to 343.35K. The heats of mixing at 298.15K were obtained for solutions whose absorbe … More nt concentrations range from 0 wt% to 65.8 wt%. The empirical formulas for solubility, vapor pressure, heat capacity, and heat of mixing were obtained from experimental data. On the basis of these observed data, the enthalpy-concentration chart of this three-component system was constructed.The theoretical analysis of the coefficient of performance was undertaken to examine the performance characteristics of this three-component system. The coefficient of performance for absorption refrigerating machines, absorption heat pumps, and absorption heat transformers were calculated using this enthalpy-concentration chart. The performance characteristics of this three-component system were compared with that of the water-lithium bromide system and that of the other systems using water , methanol, R22, and ammonia as the working medium. This three-component system was found to be suitable for an air-cooled single-stage absorption refrigerating machine, single-stage absorption heat pump, and single-stage absorption heat transformer. Less