分体式太阳能热水系统辅热模式的性能比较研究

摘要

针对阳台壁挂分体式太阳能热水系统,以太阳能保证率、经济性、用水舒适度和用水卫生状况为指标,比较分析了蓄热水箱电加热和用水终端燃气加热两种辅助加热模式对系统性能的影响,并在此基础上,提出了一种更为适宜的辅助加热运行模式.结果表明:相比较于蓄热水箱电加热模式,用水终端燃气加热模式的太阳能保证率提高了45.4％且年运行费用降低了40.73％;此外,用水终端燃气加热模式的出水温度稳定性更高,但其蓄热水箱存在滋生军团菌而影响用水卫生的隐患,建议定期在用水时段利用蓄水箱内置的电加热装置将水加热到60℃以确保水质卫生.%In this paper,the effects of two different auxiliary heating modes,in-tank electric heating mode and end-water gas water heater heating mode,on the performance of balcony wall type separated solar water heating system were compared in aspects of solar fraction,operation cost,water using comfort and water sanitation condition.And based on this,a more proper auxiliary heating mode was proposed.The results indicated that compared with the in-tank electric heating mode,the end-water gas water heater heating mode could increase the solar fraction by 45.4％ and cut the yearly operational cost by 40.73％.In addition,it has better end-water temperature stability.But it has the risk of breeding legionella in the storage tank.It is recommended to heat the water to 60 ℃ with the electric heating device built in the water tank periodically.