On The Development For The Windowless Piggery Of Passive Type And Low Cost.

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It is necessary for the livestock structures to be passive structures that make use of natural energies to be the economical and low cost buildings. The aim in this study was the develpment of the piggery. The piggery in this study consisted of pipe frames covered with films and had no window. The heat loss occurred was affected by both the convective heat transfer coefficients on the wall and the air reflux into the structures. The effects of wind velocity and wind direction on the convective heat transfer coefficient were considered through the model test with the wind tunnel. The relations of the convective heat transfer coefficient with the wind velocity showed regression lines and had the strong correlation between them. The convective heat transfer coefficient changed with the incidence angle of wind to the wall. The reflux phenomenon of open air would become the great disturbance for the control of the conditions in the structure. It concluded that the wind pressure coefficients on the wall were negative, and that the air did not flow reversely in this structure. To keep the good condition in the structure, the use of natural energies in passive way was proposed here. It might be improper for the study to use the real building for the accuracy of measurement and the complication. Therefore, the study was done by using the scale model. The results obtained from the model test were converted to the real building using the theory of the similarity. The rate of ventilation and heat generation in the model could be estimated from the reduction ratio between the real building and the model. According to the results, it concluded that the passive thermal environment should adjust the optimum thermal environment for livestock and could be obtained by multi position control of fan system.