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Performance of one and a half-effect absorption cooling cycle of H_2O/LiBr system

机译：H_2O / LiBr系统的一个半效应吸收冷却循环性能

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摘要

The performances of half-effect, single-effect and double-effect H_2O/LiBr absorption cooling cycles were analyzed, and it was found that there is an obvious blank for generation temperature between the maximum generation temperature of the single-effect cycle and the minimum generation temperature of the double-effect cycle. It was proposed that the one and a half-effect (1.5-effect) cycle can fill up the blank perfectly. The state of the art in the 1.5-effect cycles was reviewed and analyzed, and two new configurations of 1.5-effect cycles were proposed. Three configurations of 1.5-effect cycles, which are suitable for H_2O/LiBr as working fluids, were selected to be analyzed in detail. The 1.5-effect cycle shows the optimum performance at the foregoing blank of generation temperature. For example, under the conditions of evaporation temperature t_E is 5℃, and condensation temperature t_C is 42℃, and absorption temperature t_A is 37℃, the optimum range of generation temperature t_G for the 1.5-effect cycle is from 110℃ to 140℃. The coefficient of performance of the 1.5-effect cycle is about 1.0, which is more than 30% higher than that of the single-effect cycle at the same condition. The effects of the efficiency of solution heat exchanger, the generation temperature, the absorption temperature (or the condensation temperature) and the evaporation temperature on the performances of the three configurations of 1.5-effect cycle were analyzed. It was shown that the configuration Ⅱ, which is composed with a high-temperature single-effect subcycle and a low-temperature half-effect subcycle, has the highest coefficient of performance and the best operational flexibility. Among the four parameters analyzed, the performances of 1.5-effect cycles are most sensitive to the change of absorption temperature (or condensation temperature), and then to the change of generation temperature.
机译：分析了半效，单效和双效H_2O / LiBr吸收冷却循环的性能，发现在单效循环的最高产生温度和最低产生温度之间存在明显的空白。双效循环的产生温度。有人提出，一个半效应（1.5效应）循环可以完美地填补空白。审查并分析了1.5效应循环的最新技术，并提出了两种新的1.5效应循环的配置。选择了三种适用于H_2O / LiBr作为工作流体的1.5效应循环构型进行详细分析。在上述发电温度的空白处，1.5效应循环显示了最佳性能。例如，在蒸发温度t_E为5℃，冷凝温度t_C为42℃，吸收温度t_A为37℃的条件下，1.5效循环的最佳产生温度t_G范围为110℃至140℃。 。 1.5效果循环的性能系数约为1.0，比相同条件下的单效果循环的性能系数高30％以上。分析了溶液热交换器的效率，生成温度，吸收温度（或冷凝温度）和蒸发温度对三种1.5效循环构型的性能的影响。结果表明，由高温单效子循环和低温半效子循环组成的构型Ⅱ具有最高的性能系数和最佳的操作灵活性。在所分析的四个参数中，1.5效循环的性能对吸收温度（或冷凝温度）的变化最敏感，然后对发电温度的变化最敏感。

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