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Analysis of ventilation characteristics for prevention of high temperature inside a commercial greenhouse

商业温室防高温通风特性分析

基本信息

批准号：
16580209
负责人：
HAYASHI Makio
金额：
$ 2.05万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

In order to investigate the cause that the ventilation rate of large-scale Venlo greenhouse with roof ventilators and without side wall ventilators is smaller than that of conventional greenhouse with roof and side wall ventilators, the following measurements were done.1.In the case of total open area of ventilators (roof ventilators + side wall ventilators) was the same, the influence of open area of side wall ventilators on ventilation rate of the greenhouse was tested with single span greenhouse. As a result, in the spite of open area of ventilators was the same, the ventilation rate with side wall and roof ventilators opened was 1.5-5 times that with roof ventilators opened. These results suggested that the chimney effect is promoted by side wall ventilators.2.In order to investigate the influence of side wall ventilators on the inside temperature distribution and ventilation rate of the large-scale Venlo greenhouse, environmental measurement was done with medium-scale Venlo greenhouse which was equipped with side wall ventilators. It assumed that the medium-scale Venlo greenhouse was the part of the large-scale Venlo greenhouse, so the one side wall ventilators were opened in the measurement. Temperatures near the side wall decreased when side wall ventilators were opened, and the ventilation rate of greenhouse calculated by the heat balance method increased near the ventilators. However the range of the influence of side wall ventilators on environments inside the Venlo greenhouse was about 20m from the side ventilators.From these results, side wall ventilators promote the ventilation rate of the greenhouse, however the influence is decreased as departing from the side wall to central part in the large-scale Venlo greenhouse.

为了探讨无侧墙通风和有屋顶通风的大型文洛温室通风量小于有屋顶和侧墙通风的温室通风量的原因，进行了以下测量：1.在通风总开口面积为1000 m2/m2的情况下（屋顶通风器+侧墙通风器）相同，以单栋温室为试验对象，研究了侧墙通风器开口面积对温室通风量的影响。结果表明，在相同通风面积的情况下，侧墙和屋顶通风机开启时的通风量是屋顶通风机开启时的1.5 ~ 5倍。为研究侧墙通风器对大型文洛温室室内温度分布和通风量的影响，对安装侧墙通风器的中型文洛温室进行了环境测试。假定中型文洛温室是大型文洛温室的一部分，因此在测量中打开一侧墙的通风器。侧墙通风器打开后，侧墙附近的温度降低，热平衡法计算的温室通风量增加。而侧墙通风器对文洛温室内环境的影响范围在距侧墙20 m左右，说明侧墙通风器对温室通风量有促进作用，但在大型文洛温室中，随着侧墙向温室中心方向的远离，侧墙通风器对温室内环境的影响逐渐减小。