Energy-Efficient Heating and Domestic Hot Water Systems Suitable for Different Regions

摘要

Heating and domestic hot water consume a large amount of energy. The heat supply systems based on fossil fuel burning are of low energy efficiency as well as high air pollution. Air source electricity heat pump (ASAHP) was analyzed to be energy-saving for heating in cold regions. In order to select suitable system for different areas, the primary energy efficiency of electricity heating, coal boiler, gas boiler, electrical heat pump, and ASAHP-driven by various heat sources are compared. Combing the weather characteristics in different areas, the applicability of different systems in China are investigated in the energy efficiency point of view. Results show that the primary energy efficiency of ASAHP is generally higher than that of ASEHP except when the air temperature is very high. Both ASEHP and ASAHP are efficient in the hot summer and warm winter area for domestic hot water. And direct gas-fired ASAHP is the best choice in hot summer and cold winter area, temperate area, cold area as well as severe cold area. Additionally, hot water-driven ASAHP using gas boiler is the second choice for heating in hot summer/cold winter area and temperate area, and for both heating and domestic hot water in cold and severe cold areas. This work is to explore the most suitable heat supply systems for different regions, and is expected to make contributions to building energy saving and emission reduction.