Application of fuzzy control technique to secondary return air systems in large spaces;

Further the influence in jet s ventilation of secondary return air on the zones comfort is studied.

Based on the characteristics of heat and moisture loads in cleaning operation room, the non-reheated and fixed secondary air return system was analyzed in the situation that loading changes.

Based on the optimization design for the air distribution,makes a proper arrangement of the units,compares the energy consumption between the primary air return system and the secondary air return system,and analyses if reheat is necessary or not to the secondary air return system and the determination of the reheat quantity.

The clean operating department applies eight unattached clean air conditioning systems, and applies the secondary return air systems with the constant return air rate.

Primary return air system and secondary return air system are the two kinds of deal with the air in the mixture air system,they both have their advantages and disadvantages.

The way and method to decrease the energy consumption of air conditioning system for clean operating rooms in terms of energy saving analysis and positive-pressure control of air conditioning system with secondary return air, reutilization of waste heat and waste water of hospital buildings and operational management are discussed.