Abstract：

Points out that the relevant provisions of national standards must be complied with in analysis of HVAC product performance. Supply air temperature difference will increase with an increase in coil rows, but air pressure drop will increase rapidly, which obviously offsets energy saving effects. Therefore, when using air conditioning large temperature difference technology, a specific analysis  is essential to reach the optimized scheme. A series layout is unreasonable for ten or more rows of air cooling coils and will lead to a remarkable deterioration of the cooling performance. It is unreasonable for an air conditioning system in underground spaces to use the air changes method to determine the total air supply volume. The occupant density in an underground store should be determined based on the Design standard for energy efficiency of public buildings.