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PARAMETERIZATION STUDY ON THE OPERATING EFFICIENCY OF AIR-COOLED CHILLERS

机译：风冷式制冷机运行效率的参数化研究

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摘要

The chiller plants for providing cooling in buildings in a dense urban environment, as is Hong Kong, often require heat rejection by air-cooled condensers. Improved efficiency of air-cooled reciprocating chillers requires knowledge of the behaviours of the operating parameters. A parameterization study aiming at exploring such behaviours was carried out with the hybrid use of the operating data from an installed chiller in an existing building and the predicted data by a validated chiller model. The chiller efficiency generally increases with the chiller part load ratio. A close relationship between the evaporator performance and the chiller part load ratio was observed, but varying the chilled water flowrate and the evaporating temperature shows a diverse effect on the evaporator performance. Multiple steps of capacity control would result in fluctuating compressor power input. Evaluation of the condenser performance indicates that the performance cannot be simply represented by any one of the control parameters: part load ratio, refrigerant mass flow, heat rejection airflow and condensing temperature. The opportunity of reducing the condensing temperature at below-design outdoor conditions for better efficiency and energy saving was exploited through the evaluation of the boundary and the means to achieve the lowest possible working condensing temperature.
机译：像香港一样，用于在密集城市环境中为建筑物提供制冷的冷水机组通常需要通过风冷冷凝器进行散热。空气冷却往复式冷却器的效率提高需要了解操作参数的行为。旨在探索这种行为的参数化研究是通过混合使用现有建筑物中已安装的冷水机组的运行数据和经过验证的冷水机组模型预测的数据来进行的。冷水机效率通常随着冷水机部分负荷比而增加。观察到蒸发器性能与冷却器部分负荷比之间存在密切关系，但是改变冷冻水流量和蒸发温度对蒸发器性能产生不同的影响。容量控制的多个步骤将导致压缩机功率输入波动。对冷凝器性能的评估表明，不能用以下任何一个控制参数简单地表示性能：部分负载比，制冷剂质量流量，排热气流和冷凝温度。通过评估边界和实现最低可能工作冷凝温度的方法，可以利用在低于设计的室外条件下降低冷凝温度以提高效率和节能的机会。

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