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Entropy generation analysis of an adsorption cooling cycle

机译：吸附冷却循环的熵产生分析

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摘要

This paper discusses the analysis of an adsorption (AD) chiller using system entropy generation as a ther-modynamic framework for evaluating total dissipative losses that occurred in a batch-operated AD cycle. The study focuses on an adsorption cycle operating at heat source temperatures ranging from 60 to 85 ℃, whilst the chilled water inlet temperature is fixed at 12.5 ℃, - a temperature of chilled water deemed useful for dehumidification and cooling. The total entropy generation model examines the processes of key components of the AD chiller such as the heat and mass transfer, flushing and de-superheating of liquid refrigerant. The following key findings are observed: (i) The cycle entropy generation increases with the increase in the heat source temperature (10.8 to 46.2 W/K) and the largest share of entropy generation or rate of energy dissipation occurs at the adsorption process, (ii) the second highest energy rate dissipation is the desorption process, (iii) the remaining energy dissipation rates are the evaporation and condensation processes, respectively. Some of the noteworthy highlights from the study are the inevitable but significant dissipative losses found in switching processes of adsorption-desorption and vice versa, as well as the de-superheating of warm condensate that is refluxed at non-thermal equilibrium conditions from the condenser to the evaporator for the completion of the refrigeration cycle.
机译：本文讨论使用系统熵生成作为热力学框架的吸附式（AD）冷却器的分析，以评估在批量操作的AD循环中发生的总耗散损耗。该研究的重点是在热源温度为60到85℃的情况下进行的吸附循环，而冷冻水的入口温度固定为12.5℃，该温度被认为可用于除湿和冷却。总熵生成模型检查了AD制冷机的关键组件的过程，例如液体制冷剂的传热和传质，冲洗和去过热。观察到以下主要发现：（i）循环熵产生随热源温度的升高（10.8至46.2 W / K）而增加，并且最大的熵产生或能量耗散率发生在吸附过程中，（ ii）第二高的能量耗散率是解吸过程，（iii）其余的能量耗散率分别是蒸发和冷凝过程。该研究的一些值得注意的亮点是在吸附-解吸的转换过程中不可避免地会发生耗散性损失，反之亦然，以及在非热平衡条件下从冷凝器回流到冷凝器的热冷凝水的过热度降低。蒸发器以完成制冷循环。

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  • 作者

    Kyaw Thu; Young-Deuk Kim; Aung Myat; Won Gee Chun; Kim Choon NG;

  • 作者单位

    Water Desalination and Reuse Center, King Abdullah University of Science and Technology. Thuwal 23955-6900, Saudi Arabia;

    Water Desalination and Reuse Center, King Abdullah University of Science and Technology. Thuwal 23955-6900, Saudi Arabia;

    Department ofmechanical engineering, National University of Singapore, 9 engineering drive 1, Singapore 117576, Singapore;

    Department of Nuclear and Energy Engineering, Cheju National University, 66 Jejudaehakno, Jejusi, South Korea;

    Department ofmechanical engineering, National University of Singapore, 9 engineering drive 1, Singapore 117576, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    adsorption chiller; second law analysis; entropy generation; silica gel; adsorption;

    机译：吸附式冷却器第二定律分析;熵产生硅胶;吸附;

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