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本文对立式升温型溴化锂吸收式热泵循环和各部件建立了数学模型,并设计了85℃热水驱动产110℃热水的立式降膜升温型溴化锂吸收式热泵,吸收器输出功率为50 kW。然后对其在热源热水温度和流量变化、冷却水入口温度和流量改变等非设计工况下的工作特性进行了计算与分析研究,得到变工况对于机组性能系数,效率和机组负荷的影响关系图。发现在我们的研究范围内,热源水参数的变化对机组性能的影响要大于冷却水。并且在热源水参数变化过程中,机组性能存在性能急剧变化的拐点,实际运行中应当避免。
In this paper, a mathematical model was set up for vertical temperature rising type lithium bromide absorption heat pump cycle and each component, and a vertical falling film temperature rising type lithium bromide absorption heat pump driven by 85 ℃ hot water was designed. The output power of the absorber was 50 kW. Then the calculation and analysis of the operating characteristics under non-designed conditions, such as the change of temperature and flow of hot water, the inlet temperature of cooling water and the change of flow rate, and the influence of variable working conditions on the coefficient of performance, efficiency and unit load are obtained relation chart. It is found that within the scope of our study, the variation of heat source water parameters has a greater impact on the unit performance than the cooling water. In the process of changing the parameters of heat source water, the performance of the unit has the inflexible point of rapid change, which should be avoided in the actual operation.