Comparison of heat recovery outdoor air system solutions in severe cold zone in winter

The outdoor air load accounted for a larger proportion of the air conditioning load, especially in the severe cold zone of the North, which has a long winter and large temperature difference between indoor and outdoor, the proportion will be even higher. With the heat recovery equipment recycling the part heat of the exhaust air, the outdoor air load can be reduced thus to achieve the energy saving objective of the air conditioning system. Taking an actual project example, under different heat recovery modes and air preheating conditions, analyses the air handing process, and gives the static energy saving effect under the design conditions. Compares the energy efficiency with the system without heat recovery unit, and gives the outdoor air heat recovery calculation method in severe cold area.