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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Experimental analysis of reverse cycle defrosting and control strategy optimization for transcritical carbon dioxide heat pump water heater
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Experimental analysis of reverse cycle defrosting and control strategy optimization for transcritical carbon dioxide heat pump water heater

机译：跨临界二氧化碳热泵热水器反向周期除霜和控制策略优化的实验分析

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摘要

The heating performance of air source transcritical carbon dioxide heat pump will be dramatically reduced with frost formation when operating in cold regions. Although reverse cycle defrosting is widely used, no information is available in the transcritical carbon dioxide system. In this paper, the reverse cycle defrosting was experimentally investigated in a transcritical carbon dioxide heat pump with a microchannel evaporator. The effect of water flow rate, initial water tank temperature, compressor frequency and electronic expansion valve opening are respectively studied, and an optimized control strategy is proposed considering the defrosting time and stability. Results show that thermal energy is considerably affected by water side parameters, and stability is more sensitive to the water temperature and electronic expansion valve opening. With the optimized reverse cycle defrosting, defrosting time and total energy consumption are reduced by 95 s and 21.8% compared with the pre-set basic control strategy, and the total energy consumption is also saved by 38.6% compared with the other defrosting method. The optimized reverse cycle defrosting is verified to be preferable for the transcritical carbon dioxide system, and the presented discussion is beneficial for the application of reverse cycle defrosting in the air-to-water heat pump.
机译：空气源跨临界二氧化碳热泵在寒冷地区运行时，会因结霜而显著降低其供暖性能。尽管反向循环除霜被广泛使用，但跨临界二氧化碳系统中没有可用的信息。本文对带微通道蒸发器的跨临界二氧化碳热泵进行了反循环除霜实验研究。分别研究了水流量、水箱初始温度、压缩机频率和电子膨胀阀开度对除霜效果的影响，提出了考虑除霜时间和稳定性的优化控制策略。结果表明，水侧参数对热能有很大影响，稳定性对水温和电子膨胀阀开度更为敏感。优化后的逆循环除霜，除霜时间和总能耗比预先设定的基本控制策略分别减少95秒和21.8%，总能耗比其他除霜方法节省38.6%。结果表明，优化后的逆循环除霜系统适用于跨临界二氧化碳系统，有利于逆循环除霜在空气-水热泵中的应用。

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