The energy consumption of solar hot water system is mainly the energy consumption of auxiliary heating system,and its energy saving rate is positively correlated with design solar fraction of the system.Via analyzing the relationship between solar radiation and heat consumption of domestic hot water,it can be concluded that selecting the solar fraction at the deviation point of the energy sav-ing rate change curve can avoid heat waste and excessive investment,ensuring high economic benefits.Three typical buildings with central hot water supply system in Changsha were selected for analysis.Based on the meteorological parameters in Changsha and the changes in heat consumption of domestic hot water in these three types of buildings,the values of solar fraction at the deviation points of their respective energy saving rate curves were obtained.Meanwhile,the annual average heat collection effi-ciency of flat plate solar collectors in Changsha was calculated based on formulas;Derived the calcula-tion method for value and recommended values in Changsha.
Solar hot water systemEnergy saving rateSolar irradiationHeat consumption of domestic hot waterHeat collection efficiencySolar fraction
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