摘要： 【中文摘要】 空气源热泵热水器运行在高温工作区时,压缩机功率及压缩机排气温度往往偏高,这不仅给机组的安全稳定性带来了隐患,同时系统的效率也会明显下降。针对这一问题,文中提出了一种两级冷凝热泵热水系统以及相应的控制方式,并进行了实验。实验结果表明,与传统的热泵热水器相比,这一系统不仅能提高供水温度,而且能让热泵热水机组在高温工作区的冷凝温度相对较低,从而在提高供水温度的同时,有效的降低了机组最高压缩机功率以及最高压缩机排气温度,系统运行安全、可靠、高效。 【英文摘要】 When an air source heat pump water heater runs at higher water temperature,the power input and the discharge temperature of its compressor are high,leading to problems of security and stability,and the significant decrease of the system efficiency.In our study,a hot water system with a two-stage condensation heat pump and its corresponding control method were proposed.The experimental results show that compared with the conventional heat pump water heaters,the present system can raise the temperature of supply water and lower the condensation temperature of the unit running at higher water temperature,leading to the decrease in the maximum compressor power input and the highest compressor discharge temperature. 【中文关键词】 热工学; 两级冷凝热泵热水系统; 冷凝温度; 压缩机功率; 压缩机排气温度; 能效比【英文关键词】 Pyrology; Two-stage condensing heat pump hot water system; Condensing temperature; Compressor power; Compressor discharge temperature; COP
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