At present, air source heat pump water heater units are widely used and have formed relevant national standards. However, the unit energy efficiency ratio is greatly affected by the outdoor meteorological conditions, and the hot water demand usually varies with the season and the user's water use habits. It is difficult to accurately and objectively reflect the actual energy saving effect only by using the unit operating energy efficiency ratio under nominal conditions. In this paper, the finite-time thermodynamic analysis method is introduced for four cities with typical distribution of air s...
