Economic analysis of conventional clean heating methods based on energy efficiency improvement in existing rural houses

Taking a typical rural house in Chengde as an example, the heating energy consumption, retrofit costs and operation costs before and after the energy-saving retrofit of the rural house are analysed based on the on-site operation test data of two different clean heating systems, namely the air-source heat pump heating system and the heat-storage electric boiler heating system. Through the comparative analysis, the energy consumption of the air-source heat pump heating system can be reduced by about 52.5% during heating season compared with that of the heat-storage electric boiler heating system applied to the same typical rural house in Chengde. If the rural house takes the energy-saving retrofit for further energy improvement, the heating energy consumption can be reduced by about 28.7% for both the air-source heat pump heating system and the heat-storage electric boiler heating system, and the operation costs of each heating season can be reduced by 36.9% to 50.8%. The heating operation costs can be reduced significantly by applying the clean heating renovation for heating system and the energy-saving retrofit on envelopes simultaneously.