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

被动式低成本无窗猪舍的开发。

• 批准号: 05452330
• 负责人: ITO Minoru
• 金额: $ 3.14万
• 依托单位: IWATE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452330/
• 关键词: Passive; Windowless Piggery; Convective Heat Transfer Coefficient; Wind Pressure Coefficient; Multi Position Control; 模型実験; 相似則; 熱伝達

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.

畜牧业建筑必须是被动式结构，利用自然能源，成为经济、低成本的建筑。本研究的目的是养猪场的发展。本研究中的猪舍由覆盖有薄膜的管架组成，没有窗户。壁面对流换热系数和空气回流对热损失的影响很大。通过风洞模型试验，研究了风速和风向对对流换热系数的影响。对流换热系数与风速呈直线回归关系，两者之间有较强的相关性。对流换热系数随风对壁面入射角的变化而变化。室外空气的回流现象对结构内的工况控制会产生很大的干扰。结果表明，墙体上的风压系数为负，空气在该结构中没有反向流动。为了保持结构的良好状态，本文提出了以被动方式利用自然能源的方法。由于测量的准确性和复杂性，本研究可能不适合使用真实的建筑物。因此，本研究采用比例模型进行。利用相似理论将模型试验结果转换为真实的建筑物。通过计算模型与真实的建筑物之间的折减比，可以估算出模型中的通风量和发热量。结果表明，被动式热环境应能调节家畜的最佳热环境，并可通过风机系统的多位置控制来实现。