New Working Medium-Absorbent System for Absorption Heat Pump

吸收式热泵新型工质吸收系统

基本信息

批准号：
62550167
负责人：
UEMURA Tadashi
金额：
$ 0.96万
依托单位：
Faculty of Engineering, Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

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

本研究旨在检验甲醇-溴化锌氯化锂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。通过测量样品溶液的结晶温度确定硼化锂和氯化锌的最佳混合比例。溴化锂和氯化锌的最合适的混合比例分别是1.0重量和1.0重量。测量了甲醇-溴化锂-氯化锌体系的物理性质（密度、粘度、表面张力、溶解度和蒸气压）。密度、粘度、表面张力、蒸气压和热容的测量是在不同条件下进行的。温度和吸收剂浓度是在 265.85K 至 343.35K 的温度范围内获得的。混合热为 298.15K。溶解度、蒸气压、热容和混合热的经验公式是根据这些观测数据得出的。绘制了该三组分体系的焓-浓度图。性能系数的理论分析是为了考察该三组分体系的性能特征。吸收式制冷机的性能系数。使用该焓浓度图计算了热泵和吸收式热转换器。将该三组分系统的性能特性与水-溴化锂系统以及使用水、甲醇、R22 和 R22 的其他系统的性能特性进行了比较。该三组分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变压器。