Performance Calculation and Analysis of Air Source Heat Pump Water Heater

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 source heat pump water heater units, combined with regional meteorological conditions and actual application of users. A continuous energy efficiency evaluation integral model is proposed. Then the actual energy efficiency of the air source heat pump water heater unit is evaluated based on the annual comprehensive operating conditions to determine a more reasonable evaluation standard. The analysis results show that the comprehensive energy efficiency evaluation of the air source heat pump water heater unit is more accurate and more in line with the actual operation of the system by using the annual comprehensive operation hourly working condition as the reference working point. This case can be used as a reference for the evaluation of this type of thermal system.