Prediction Technique for Pressure Change in Rooms by Using an Equivalent Circuit Network

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Room pressurization is an important ventilation design technique for preventing airborne contaminants in biological clean rooms. To design an air-conditioning system that controls room pressure, an analytic method is needed, that predicts and estimates the change in room pressure and duct pressure, since they influence each other. In this paper, we present a new technique for predicting room pressure and duct pressure. In our technique, this pressure propagation mechanism is replaced with an equivalent circuit network by considering the air volume as electrical current, the lifted pressure by the fan as a battery electromotive force, and the friction loss as an electrical resistance. The change in room pressure is represented as the equation of resistance to air leakage. By using this technique, Kirchhoffs Voltage Law is applied to the duct network and the pressure calculation can be solved without many variables at the junctions. In addition, combining the resistance coefficients for elements carrying the same degree of air volume simplifies the duct network. Therefore, convergence performance is improved and the computing time can be shortened. By comparing it with experimental results, we verify the validity of the method. Using this technique, the air-conditioning equipment can be evaluated under dynamic usage and the specification of the control devices can be optimized. The effectiveness of any new ideas for maintaining a stable system response can be examined.

Prediction Technique for Pressure Change in Rooms by Using an Equivalent Circuit Network

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