水箱进口结构对热泵热水器释能性能的影响

Effect of water tank inlet structure on energy discharge performance of heat pump water heater

为提高空气源热泵热水器系统性能,针对蓄热水箱进口,设计弧形挡板型水箱进口结构,建立热泵系统与水箱系统耦合模型,并搭建空气源热泵热水器实验台。选取热水输出率、系统性能系数η两项评价指标,对采用弧形挡板型、上冲型和侧进型进口结构的热泵热水器的释能性能进行比较,研究结果表明:模拟与实验出口水温误差在±0.5℃以内,释能20 min内系统性能系数η误差小于5.3%。热泵热水器采用弧形挡板型进口结构时,在进口流量10 L/min、进口水温15℃的工况下,热水输出率和系统性能系数η较上冲型分别提升了47.6%和19.5%,较侧进型分别提升了14.8%和6.9%;在进口流量为5~15 L/min、进口水温为5~25℃的变工况下,热水输出率和系统性能系数η也均有提升,最大分别可达62.1%和22.0%。

To improve the performance of the air source heat pump water heater system,a curved baffle type inlet structure was designed for the water storage tank.The model of the heat pump system and the water tank system was coupled,and an air source heat pump water heater test bench was built.Extraction efficiency and η were introduced to evaluate the performance of heat pump water heater with different inlet structures.The results show that the error of the outlet water temperature between the results of simulation and the experiment is within ±0.5 ℃,and the error of η(system performance coefficient) is less than 5.3% during 20 min of energy release.The extraction efficiency and η of the heat pump water heater adopting the curved baffle type inlet structure are both increased by 47.6% and 19.5% compared with the direct type,and increased by 14.8% and 6.9% compared with the side entry type,under the nominal working condition of with inlet flow rate of 10 L/min and inlet water temperature of 15 ℃.The extraction efficiency and η are also improved with the inlet flow rate of 5-15 L/min and the inlet water temperature of 5-25 ℃,reaching the maximum of 62.1% and 22.0%,respectively.