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The Use Of Helical Heat Exchanger For Heat Recovery Domestic Water-cooled Air-conditioners

机译：螺旋式换热器在家用水冷式空调热回收中的应用

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摘要

An experimental study on the performance of a domestic water-cooled air-conditioner (WAC) using tube-in-tube helical heat exchanger for preheating of domestic hot water was carried out. The main aims are to identify the comprehensive energy performance (space cooling and hot water preheating) of the WAC and the optimum design of the helical heat exchanger taking into account the variation in tap water flow rate. A split-type WAC was set up for experimental study at different indoor and outdoor conditions. The cooling output, the amount of recovered heat, and the power consumption for different hot water flow rates were measured. The experimental results showed that the cooling coefficient of performance (COP) of the WAC improves with the inclusion of the heat recovery option by a minimum of 12.3%. This can be further improved to 20.6% by an increase in tap water flow rate. Same result was observed for the comprehensive COP of the WAC. The maximum achievable comprehensive COP was 4.92 when the tap water flow rate was set at 7.7 L/min. The overall heat transfer coefficient of the helical heat exchanger under various operating conditions were determined by Wilson plot. A mathematical model relating the over all heat transfer coefficient to the outer pipe diameter was established which provides a convenient way of optimising the design of the helical heat exchanger.
机译：对采用管内螺旋换热器对生活热水进行预热的家用水冷空调（WAC）的性能进行了实验研究。主要目的是考虑自来水流量的变化，确定WAC的综合能源性能（空间冷却和热水预热），以及螺旋热交换器的最佳设计。设置了分体式WAC，以在不同的室内和室外条件下进行实验研究。测量了不同热水流量下的冷却输出，热量回收量和功耗。实验结果表明，加入热回收选项后，WAC的冷却性能系数（COP）至少提高了12.3％。通过增加自来水流量，可以将其进一步提高到20.6％。 WAC的全面COP观察到相同的结果。当自来水流量设为7.7 L / min时，可达到的最大综合COP为4.92。螺旋换热器在各种工况下的总传热系数由Wilson曲线确定。建立了将总传热系数与外管直径联系起来的数学模型，这为优化螺旋换热器的设计提供了方便的方法。

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