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Adopting the comprehensive correction coefficient and the three-phase statistical approach of electricity charge, energy saving and its benefit were identified. When electric boilers were replaced by air-source heat pumps to produce hot water in a hotel, the annual-saving electricity and energy-saving benefits were 443700 kWh and 363400 Yuan, and the ratio of energy-saving and energy-saving benefits were 63.45% and 71.24%, respectively. The COP of this project was increased from 0.8 to 3.52, and the annual CO 2  emission reduction was 552.85 tCO 2 . The power consumption and cost per ton of hot water were 12.44 kWh and 7.13 Yuan, respectively. The comprehensive correction coefficient was proposed, considering a three-phase statistical approach of electricity charge, namely peak, flat and valley periods. The innovative method can be applied to energy-efficient effect evaluation when some problems cannot be solved according to the standards.

Energy-efficient effect evaluation of air-source heat pump engineering in a hotel