Performance study of laboratory exhaust system based on diversity coefficient and usage coefficient of fume hoods

Presents the definitions of the two coefficients. Taking the laboratories of an organic chemistry institute as example, by means of field investigation and statistics, obtains the diversity coefficients and usage coefficients of the fume hoods. Compares the fan energy consumption of the constant air volume (CAV) exhaust system with that of the variable air volume (VAV) exhaust system, and finds that the energy saving rate of the VAV system considering diversity and usage coefficients is notably greater compared with that of the CAV system. Suggests improving the work habit of the hood users and adopting the VAV system.