New Working Medium-Absorbent System for Absorption Heat Pump

本文研究了甲醇-溴化锂-氯化锌体系是否适用于吸收式制冷机、吸收式热泵和吸收式热变换器。通过测定样品溶液的结晶温度，确定了硼化锂和氯化锌的最佳配比。溴化锂和氯化锌的最佳混合比分别为1.0重量比和1.0重量比。测定了甲醇-溴化锂-氯化锌体系的热性质（热容和混合热）和物理性质（密度、粘度、表面张力、溶解度和蒸气压）。密度，粘度，表面张力，蒸汽压和热容的测量进行了在不同的温度和吸收剂浓度。在265.85 ~ 343.35K温度范围内测定了它们的溶解度。在298.15K下，得到了溶液的混合热， ...更多信息 NT浓度范围为0重量%至65.8重量%。从实验数据中获得了溶解度、蒸汽压、热容和混合热的经验公式。在此基础上，建立了该三元体系的浓度-浓度关系图，并对该三元体系的性能系数进行了理论分析，以考察该三元体系的性能特征。利用该表计算了吸收式制冷机、吸收式热泵和吸收式热变换器的性能系数。将该三元体系的性能特性与水-溴化锂体系以及以水、甲醇、R22和氨为工质的其它体系的性能特性进行了比较。该三元系统适用于风冷单级吸收式制冷机、单级吸收式热泵和单级吸收式热Transformer。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