初始水温对空气源热泵热水器系统性能的影响

发布时间：2018-05-21 17:32

  本文选题：热泵热水器 + 初始水温　； 参考：《制冷学报》2017年06期

【摘要】：本文针对空气源热泵热水器加热至较高水温时系统效率明显下降的问题,研究初始水温对系统性能的影响,通过实验改变初始水温,分析系统各参数随加热水温的变化规律,得到实际运行特性及制热性能恶化的原因。结果表明:相同初始水温,随着加热的进行,COP不断下降,加热前期下降趋势较为平缓,后期变大;不同初始水温,因系统开机时存在"预热"阶段,加热后期又受压缩机大量吸气带液的影响,故平均COP随初始水温的升高呈先减小后增大的趋势;少量吸气带液能有效降低排气温度,改善系统性能,大量吸气带液却增大系统功耗,加剧COP的下降趋势。此外,提出以排气温度下降后再次上升时的拐点作为压缩机开始大量吸气带液的参照点,从而提升系统性能。
[Abstract]:Aiming at the problem that the system efficiency of air-source heat pump water heater decreases obviously when heated to a higher water temperature, the effect of initial water temperature on the system performance is studied in this paper. The variation of system parameters with heating water temperature is analyzed by changing the initial water temperature through experiments. The actual operation characteristics and the causes of deterioration of heating performance are obtained. The results show that the cop of the same initial water temperature decreases continuously with the heating, the decreasing trend of the earlier heating period is more gentle, and the later stage becomes larger, and the different initial water temperature is due to the "preheating" stage when the system starts up. At the later stage of heating, the compressor is affected by a large amount of suction fluid, so the average COP decreases first and then increases with the increase of initial water temperature, and a small amount of suction strip liquid can effectively reduce the exhaust temperature and improve the performance of the system. A large amount of inspiratory fluid increases the power consumption of the system, and exacerbates the downward trend of COP. In addition, the inflection point when the exhaust temperature drops and rises again is proposed as the reference point for the compressor to start a large amount of suction fluid, thus improving the performance of the system.
【作者单位】： 上海理工大学能源与动力工程学院;
【基金】：上海市动力工程多相流动与传热重点实验室(1N-15-301-101)项目资助~~
【分类号】：TQ051.5
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本文编号：1920122