4417 -- Temperature Efficiency of Rooms with Displacement Ventilation PDF

Temperature efficiency is a generally recognized index for estimating ventilation effectiveness, but so far we still have no way of determining its value except by test. In this paper, based on analysis of typical temperature patterns of an upwardly ventilated room with different heat source conditions, the temperature efficiency is proven to closely correlate with the thermal stratification height Z, the room radiation transfer factor R, the room volume V, as well as the ratio of the source to floor area f/F. The mathematical representation of temperature efficiency for a ventilated room with a plate heat source is obtained. In comparison with tests, the mean relative error of prediction for sample size n = 60, with a standard deviation ä = 0.089, is equal to 0.108.

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