This study deals with the launch time of main characteristic of NH3-H 2O absorption chiller under different working condition. The aim of this work was about to scrutinize a lumped-parameter dynamic simulation of aqua-ammonia absorption chiller in addition to investigating the effect of subcooled liquid at condenser/absorber outlet on absorption chiller’s key parameters launch time. Also, the effect of ambient temperature on absorption chiller’s key parameters’ launch time is studied. In order to determine the thermodynamic properties of the working fluid, the Engineering Equation Solver software is applied. By making a link between Engineering Equation Solver and MATLAB software, the differential equations are solved in the MATLAB software environment by fourth-order Rung–Kutta method. According to the result, increase of the sub-cool liquid temperature at condenser outlet has no effect on absorption chiller’s key parameters’ launch time. Besides, 10 ℃-increase in subcooled liquid temperature at the absorber outlet leads to decreasing the launch time of the coefficient of performance to 19.35%. The result shows that if cooling tower temperature goes from 22 ℃ to 30 ℃, launch time of the coefficient of performance rises by 10.43%, while evaporator heat transfer rate falls by 30%. To validate the dynamic model, the results deduced from numerical simulation are compared with peer steady–state results.

中文翻译：

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NH3-H2O吸收式制冷机不同工况下启动时间研究

本研究涉及NH3-H 2O吸收式制冷机在不同工况下主要特性的启动时间。除了研究冷凝器/吸收器出口处过冷液体对吸收式冷却器关键参数启动时间的影响之外，这项工作的目的还在于仔细检查氨水吸收式冷却器的集总参数动态模拟。此外，还研究了环境温度对吸收式制冷机关键参数启动时间的影响。为了确定工作流体的热力学性质，应用了工程方程求解软件。通过在工程方程求解器和 MATLAB 软件之间建立链接，在 MATLAB 软件环境中通过四阶 Rung-Kutta 方法求解微分方程。根据结果​​，冷凝器出口过冷液温度升高对吸收式冷水机组关键参数的启动时间没有影响。此外，吸收塔出口过冷液温度每升高10℃，性能系数的启动时间降低至19.35%。结果表明，冷却塔温度由22℃提高到30℃，性能系数启动时间提高10.43%，而蒸发器传热率下降30%。为了验证动态模型，将从数值模拟推导出的结果与同等稳态结果进行比较。结果表明，冷却塔温度由22℃提高到30℃，性能系数启动时间提高10.43%，而蒸发器传热率下降30%。为了验证动态模型，将从数值模拟推导出的结果与同等稳态结果进行比较。结果表明，冷却塔温度由22℃升高到30℃，性能系数启动时间提高10.43%，而蒸发器传热率下降30%。为了验证动态模型，将从数值模拟推导出的结果与同等稳态结果进行比较。