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Experimental study on characteristics of a dual temperature control valve in the chilled water system of an air-conditioning unit

机译：空调机组冷水系统双温控阀特性的实验研究

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The excess flow of water increases the energy consumption of water pumps in the chilled water systems of air-conditioning units. This paper proposes a strategy to control the chilled water flow rate of a fan coil unit (FCU) using a control valve. A physical simulation test bench was built to verify valve control and energy-saving effects. Results showed that the control valve could effectively regulate the flow rate of chilled water, improve the temperature difference (delta-T) between supply and return water, and reduce the energy consumption of the chilled water pump. With a supply water temperature of 7 C and low (325 m(3).h(-1)), medium (500 m(3).h(-1)), and high (600 m(3).h(-1)) FCU air velocity levels, the average delta-T values were 4.79 degrees C, 4.39 degrees C, and 4.97 degrees C, respectively, and the energy consumption of the chilled water pump decreased by 12.20%, 11.31%, and 10.66%, respectively. With medium air velocity and supply water temperatures of 7 degrees C, 8 degrees C, and 9 degrees C, the average delta-T between supply and return water was 4.39 degrees C, 3.56 degrees C, and 3.33 degrees C, respectively, and the energy consumption of the chilled water pump decreased by 11.31%, 5.10%, and 7.80%, respectively. These research results provide useful insights in relation to the problem of excess chilled water flow identified above. (C) 2019 Elsevier B.V. All rights reserved.
机译：水的过量流动会增加空调机组的冷水系统中水泵的能耗。本文提出了一种使用控制阀控制风机盘管装置（FCU）的冷水流量的策略。建立了物理模拟测试台，以验证阀门控制和节能效果。结果表明，该控制阀可有效调节冷冻水的流量，改善给水与回水之间的温差（ΔT），并降低冷冻水泵的能耗。供水温度为7 C且低（325 m（3）.h（-1）），中（500 m（3）.h（-1））和高（600 m（3）.h（ -1））FCU风速，平均ΔT值分别为4.79摄氏度，4.39摄氏度和4.97摄氏度，冷冻水泵的能耗降低了12.20％，11.31％和10.66 ％， 分别。在7摄氏度，8摄氏度和9摄氏度的中等空气速度和供水温度下，供水和回水之间的平均差值T分别为4.39摄氏度，3.56摄氏度和3.33摄氏度，而冷冻水泵的能耗分别降低了11.31％，5.10％和7.80％。这些研究结果提供了有关上述冷水过剩问题的有用见解。 （C）2019 Elsevier B.V.保留所有权利。

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