• CN:11-2187/TH
  • ISSN:0577-6686

›› 2010, Vol. 46 ›› Issue (2): 119-125.

• 论文 • 上一篇    下一篇

吸收式制冷机特性规律研究

张晓晖;伍金泉   

  1. 苏州大学物理科学与技术学院;国立新加坡大学机械工程系
  • 发布日期:2010-01-20

Research on Behavior and Modeling of Absorption Chiller

ZHANG Xiaohui;WU Jinquan   

  1. School of Physical Science and Technology, Soochow University Department of Mechanical Engineering, National University of Singapore
  • Published:2010-01-20

摘要: 根据换热器基本理论及热力学基本定律,通过机理描述加以试验数据修正的方法,建立描述吸收式制冷机性能的准理论模型,由于模型以少量易测参数(如蒸发器出口温度、发生器入口温度及冷凝器入口温度等)表示,避免对具体设备详细数据的依赖需求,更具有实用性,同时,模型具有通用性的特点,根据具体吸收式制冷机的性能试验数据可以确定模型中的系数,在吸收式制冷机部分负荷工况下,模型预测的性能系数与实际的性能系数进行对比,结果表明两者吻合较好,相对标准偏差的最大值小于10%,验证了模型的有效性。研究吸收式制冷机稳态变工况性能,分析发现,当制冷量和性能系数以与其设计值的比值表达时,同一系列不同规格吸收式制冷机性能曲线可以归结为单一曲线,性能方程可以用一个统一的方程表示,表明了同一系列不同规格吸收式制冷机性能的相似性。

关键词: 模型, 吸收式制冷机, 相似, 性能

Abstract: An off-design quasi-theoretical model of absorption chiller performance is derived by combining theoretic and experimental methods. Due to the description of measurable parameters (evaporator outlet temperature, generator inlet temperature and condenser inlet temperature) in the mathematic model, the requirement of a large number of detailed parameters could be avoided, which makes this method more practical for system analysis and comparison. An advantage of the model lies in its generality. Based on experimental data, the coefficients can be determined, so it is suitable for use. It can also be used to study and analyze the off-design general characteristics of absorption chiller. The prediction values of coefficient of performance(COP) under partial load are compared with detailed experimental data from a set of commercial chillers. The maxzimum relative standard deviation is less than 10%, The agreement between theory and actual performance data confirms that the model is valid. Typical partial load performances are summarized and it is found that for absorption chiller, when COP and cooling capacity are expressed as the ratio to their design values, the set of performance curves of 1/COP against 1/(cooling rate) for a series of absorption chillers can be integrated into a single curve in partial load, also the model can be expressed in a non-dimensionless form, which indicates that similarity exists for a set of absorption chillers.

Key words: Absorption chiller, Modeling, Similarity, Thermodynamics

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