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首页> 外文期刊>International Journal of Refrigeration >Long-term performance of air-side heat transfer and pressure drop for finned tube evaporators of air conditioners under intermittent operation conditions
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Long-term performance of air-side heat transfer and pressure drop for finned tube evaporators of air conditioners under intermittent operation conditions

机译：间歇运行条件下空调翅片管蒸发器的空气侧传热和压降的长期性能

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摘要

In this study, the effects of long-term intermittent operations on the air-side heat transfer and pressure drop performance of finned tube evaporators of air conditioners were investigated by experiments on an aluminum-fin evaporator and a copper-fin evaporator. In order to simulate intermittent operations of on-off controlled air conditioners, the temperatures of the two evaporators changed to 5 ± 0.5 ℃ at first and then to 27 ± 0.5 ℃ repeatedly. The repetition number was up to 4800, and the air-side heat transfer and pressure drop of the two evaporators were tested after every 300 repetitions. The test results indicate that after long-term intermittent operations, the air-side heat transfer coefficient decreases and the pressure drop increases. The variations of the heat transfer coefficient and the pressure drop are more obvious at lower inlet air velocity, and the influence of long-term intermittent operations on the aluminum-fin evaporator is greater than that on the copper-fin evaporator.
机译：在这项研究中，通过铝翅片蒸发器和铜翅片蒸发器的实验，研究了长期间歇运行对空调翅片管蒸发器空气侧传热和压降性能的影响。为了模拟开关空调的间歇性运行，两个蒸发器的温度首先改变为5±0.5℃，然后反复改变为27±0.5℃。重复次数最多为4800次，每300次重复后测试两个蒸发器的空气侧传热和压降。试验结果表明，经过长期间歇运行，空气侧传热系数减小，压降增大。在较低的进气速度下，传热系数和压降的变化更加明显，长期间歇操作对铝翅片蒸发器的影响大于对铜翅片蒸发器的影响。

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