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Experimental and numerical investigation of the thermal performance of evaporative cooled greenhouses in hot and arid climates

机译：热干旱气候蒸发冷却温室热性能的实验和数值研究

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摘要

The controlled microclimate of greenhouses is vital for producing quality yield. This paper investigates the thermal performance of an evaporative cooled greenhouse operating in Qatar. Three design factors affecting the greenhouse thermal performance were assessed, namely the greenhouse geometry, operational parameters, and its geographical location. Geometrical parameters include induction fan elevation, roof shape, and aspect ratio. Operational parameters refer to the air flowrate. The greenhouse location dictates the incident solar intensity that was studied. Computational Fluid Dynamics (CFD) was used to model a typical ASHRAE compliant greenhouse. The simulation results were validated using measured data of a greenhouse inner air temperature, relative humidity, and the global incident solar radiation, showing good agreement. Simulation results showed that induction fans located at or below the crop height resulted in lowering the average temperature of the greenhouse. Doubling of the greenhouse ventilation rate from 20 ACH to 40 ACH further decreased the greenhouse air temperature. Temperature rise due to high incident solar radiation is reduced by increasing the ventilation rates. The uneven span greenhouse roof shape resulted in the lowest average inner temperature. For the same greenhouse floor area and volume, the effect of the aspect ratio showed negligible differences.
机译：温室的受控微气候对于生产质量产量至关重要。本文研究了卡塔尔蒸发冷却温室的热性能。评估了影响温室热性能的三种设计因素，即温室几何形状，操作参数及其地理位置。几何参数包括感应式风扇高度，屋顶形状和纵横比。操作参数指的是空气流量。温室位置决定了研究的入射太阳能强度。计算流体动力学（CFD）用于模拟典型的Ashrae符合温室。使用温室内部空气温度，相对湿度和全球事件太阳辐射的测量数据验证了仿真结果，表现出良好的一致性。模拟结果表明，位于或低于作物高度的感应风扇导致温室的平均温度降低。从20 ACH到40 ACh的温室通风率加倍进一步降低温室气温。通过增加通风速率，降低了由于高入射太阳辐射而导致的温度升高。不均匀的温室屋顶形状导致平均内部温度最低。对于相同的温室地板和体积，纵横比的效果显示出可忽略的差异。

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