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Abstract

A method of rapidly balancing air flows in a complex paint spray booth having a series of cells supplied by a common air flow that is pushed by an adjustable speed supply fan and then divided into downdrafts for each of the said cells accompanied by cross-flows between said cells. The downdrafts and cross-flows converging into exhaust flows drawn by an adjustable speed exhaust fan, the system having control elements for changing the downdrafts and/or cross-flows, and further having means for passing the exhaust flow through a waste paint water scrubber having an adjustable venturi gap width. The method comprising (a) setting an exhaust an speed and venturi gap width by correlating perturbed exhaust air flow rate data with a desired exhaust air flow rate at a desired exhaust pressure drop to establish a target fan curve as a function of pressure drop and exhaust flow rate, the setting for the exhaust fan sped and venturi gap width being derived from such curve; and (b) setting a supply fan speed and control position for each cross-flow damper by solving an objective optimization function for the sum of the cross-flows by using perturbed supply fan speed values and cross-flow rate values that establish distinct optimum cross-flow velocities at a specific air supply velocity from which the supply fan speed and cross-flow speed damper positions can be derived.

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First Claim