Research on calculation methods of annual energy saving using heat recovery devices in nearly zero energy

Based on GB/T 51350-2019 Technical standard for nearly zero energy buildings, puts forward a calculation method of annual energy saving of nearly zero energy residential buildings with outdoor air heat recovery devices. Calculates and analyses the annual energy saving of nearly zero energy residential buildings with heat recovery devices in five representative cities in the main climatic regions of China. Lists the annual energy saving range of heat recovery devices used in nearly zero energy residential buildings in representative cities. Gives the improvement degree of annual energy saving of heat recovery devices by setting bypass function when mechanical ventilation and natural ventilation are used in transition season, respectively.