Abstract
In the previous papers, it was already confirmed by simulation and field measurement that VAV system was the most suitable air conditioning system for energy saving. The purpose of this paper is to study economical problems in VAV duct design, namely, location of static pressure transmitter, optimum duct friciton rate and fan control. As to static pressure transmitter, the author analyzes pressure distribution in VAV duct system and states a method of deciding the optimum location. If friction rate is smaller in ductwork, the power consumption of fan decreases. But it needs larger size of the duct, and so the first cost becomes more. Although speed control is the most effective for energy saving in VAV fan control systems, it needs the highest first cost. Therefore, in this report, the author, proposing a formula of optimum friction rate on the basis of generalization of the first cost and the operating one, and applying it to an actual air duct design, obtained the value of optimum friction rate. Besides, the author analyzed VAV fan controls as to its optimum economic system.
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