単室モデルの通風量に関する数値シミュレーションによる基礎的検討

概要

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Cross-ventilation rate which means the flow rate of natural ventilation passing through a house is not easily calculated by the ordinary equation for ventilation rate based on pressure drop coefficients of openings, because the air flow through an opening conserves a part of its dynamic energy. Numerical simulation of cross-ventilation can give the detailed information of air flow in and around a house, and the cross-ventilation rate, pressure differences and other data can be easily calculated from them. Cross-ventilation rate is examined mainly based on the numerical simulation results, which is compared with wind tunnel tests and the ordinary equation. There are six models which have the same outside shape and differ in partitions one another. The differences between the cross-ventilation rates by the numerical simulation and those by the wind tunnel tests are small, and the order of the cross-ventilation rate in the models by the numerical simulation is the same as that by the wind tunnel tests. The ventilation rates calculated by the ordinary equation are smaller than those of the numerical simulation by 10-30%, and the ordinary equation can not express the changes of the opening in the partition. The equation based on the total pressure drop coefficient is useful for the cross-ventilation rate.
1995-08-30