Study on prediction and control of air-distribution within bi-production facilities.

气流组织特性，如气流速度、温度、湿度和湿度等，对大型温室和畜舍的高效生产至关重要。另一方面，CFD（计算流体动力学）技术被引入到预测和控制生物生产设施内的空气分布环境。本研究的目的是建立新的环境设计方法的生物生产设施使用CFD技术。本文首先在中国和日本的大型温室中进行了垫扇降温系统的实验，收集了温室气流组织的基本数据。然后利用CFD技术对温室内的三维气流和温度分布进行了数值计算和模拟.利用CFD技术对温室内气流速度和温度分布进行了数值模拟，结果表明，采用垫式冷却系统和风机冷却系统的温室内气流速度和温度分布具有很好的一致性 关于我们 与实验数据进行了比较，证明了CFD技术计算结果的正确性。另外，利用CFD技术模拟结果表明，温室内部空间存在主气流区和回风区，温室空间温度分布存在垂直和水平方向的不均匀性。另一方面，来自冷却垫的低温空气受回风的影响，侵入到高屋面空间，降低了冷却效果.为了获得垫扇降温温室气流组织的基本数据，在北京、上海和日本爱知县进行了不同气候条件下的室内气流组织实验。从实验来看，垫和风扇冷却系统被认为在炎热季节相当潮湿的气候条件下是有效的。然而，垫扇式降温温室普遍存在的问题是太阳辐射下气流方向上的温升.采用CFD技术对番茄等高大作物的垫扇式降温温室内的气流和温度分布进行了数值模拟。当气流方向与作物生长方向一致，作物层具有有效的体积孔隙度和表面渗透率时，作物层内部的降温效果被认可。少

Air distribution characteristics, such as air-velocity, temperature, humidity and do on, are very important for effective production in large-scale greenhouses and livestock housings. On the other hand, the CFD (computational fluid dynamics) technique is introducing to predict and control the air-distribution environment within the bio-production facilities. The objective of this study is to establish the new environmental design method for bio-production facilities using with the CFD technique. At first, the basic data collections of air-distribution were done through the experiments in large greenhouses equipped with the pad and fan cooling system in China and Japan. And then numerical calculation and simulation on the three dimensional airflow and temperature distribution inside the greenhouses were performed by using the CFD technique.1. Using the CFD technique, calculated air-velocity and temperature distribution in the greenhouse with the pad and fan cooling system were very clos … More e to the experimental data, so it was proved that there was a clear validity of the calculation by CFD technique. In addition, simulation results by the CFD technique showed the main and return air-flow areas existed in the space inside the greenhouse, and the vertical and horizontal non-uniformity of the temperature distribution existed in the greenhouse space. On other hand, the low temperature air from the cooling pad intruded into high roof space by the influence of return air-flow, and therefore the effect of cooling was decreased.2. In order to collect the basic data of air-distribution in the greenhouses with the pad and fan cooling system, experimental measurements were performed under different climatic conditions in Beijing and Shanghai in China and Aichi Prefecture in Japan. From the experiments, the pad and fan cooling system was considered to be effective in rather humid climatic conditions during hot season. However, the common problem in the pad and fan cooling greenhouse was the temperature rise across the airflow direction from the pad to fan under solar radiation.3. The interior air-flow and temperature distribution were simulated by using the CFD techniques in the pad and fan cooling greenhouse in which high crop such as tomatoes are grown. The cooling effect inside the crop layer was recognized if the directions of air-flow was coincide with the crop raw and the crop layer had effective volume porosity and surface permeability. Less