Performance analysis of a CO2 heat pump water heating system under a daily change in a standardized demand
Performance analysis of a CO2 heat pump water heating system under a daily change in a standardized demand
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DOI：
10.1016/j.energy.2009.11.008
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发表时间：
2010-02
期刊：
影响因子：
9
通讯作者：
R. Yokoyama;T. Wakui;Junya Kamakari;K. Takemura
中科院分区：
文献类型：
--
作者：
R. Yokoyama;T. Wakui;Junya Kamakari;K. Takemura
使用二氧化碳作为天然制冷剂的空气-水热泵已经开发并商业化。预计它们将为住宅热水供应的节能做出贡献。本研究的目的是通过数值模拟分析由二氧化碳热泵和热水储罐组成的热水系统的性能。本文分析了标准化热水需求每日变化情况下的系统性能，并研究了储罐温度分布的一些特征以及系统性能标准，例如性能系数、存储和系统效率以及存储和未使用的热水量。结果表明，热水需求的日变化不会显着影响COP、存储和系统效率的日平均值，而它不仅显着影响自取水模式后未使用热水量的日变化，而且显着影响收费模式后存储的热水量的日变化。定量地阐明了热水需求的每日变化对储存和未使用的热水量的影响。
Air-to-water heat pumps using CO2as a natural refrigerant have been developed and commercialized. They are expected to contribute to energy saving in residential hot water supply. The objective of the research is to analyze the performance of a water heating system composed of a CO2heat pump and a hot water storage tank by numerical simulation. In this paper, the system performance is analyzed under a daily change in a standardized hot water demand, and some features of the temperature distribution in the storage tank and the system performance criteria such as coefficient of performance, storage and system efficiencies, and volumes of stored and unused hot water are investigated. It turns out that the daily change in the hot water demand does not significantly affect the daily averages of the COP, and storage and system efficiencies, while it significantly affects not only the daily change in the volume of hot water unused after the tapping mode, but also that in the volume of hot water stored after the charging mode. The influence of the daily change in the hot water demand on the volumes of stored and unused hot water is clarified quantitatively.