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首页> 外文期刊>Energy Conversion & Management >Optimal space utilization of a greenhouse using multi-rack tray system: Thermal modeling and experimental validation
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Optimal space utilization of a greenhouse using multi-rack tray system: Thermal modeling and experimental validation

机译：使用多机架托盘系统的温室的最佳空间利用：热模型和实验验证

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In this study, upper space inside an east-west oriented greenhouse (where the micro-climate is also under control) is optimised for producing maximum number of nursery plants by developing a multi-rack tray system (MRTS). The MRTS is designed in such a way that the vertical distance between the two consecutive trays (H) and width of the tray (W) is optimised for different months of the year at different latitudes so that the shadow of the upper tray does not fall on the lower one. The number of stacks in a greenhouse of fixed height (say 4 m) is a direct function of the maximum altitude angle of the sun at noon (α_s) at particular latitude. It is observed that at 10°N and 20°N latitudes α_s remains greater than 45° (H/ W > 1) even during the winter months. It means not more than two stacks are possible inside a 4 m high greenhouse during December and January. The computations show that at 30°N, 40°N and 50°N latitude, the number of stacks inside a greenhouse can be five, seven and twelve, respectively during the winter months of December and January. A transient thermal model coupled with MRTS is also developed to predict the soil, plant and air temperature inside the greenhouse. It is observed that the predicted and measured values are in close agreement. It is also observed that due to the increased mass of soil (in the trays) inside the greenhouse and due to reduced conduction losses to the ground beneath, MRTS also acted as a soil heat storage system before germination of the plants which stored heat during the sun-shine hours and released the same during the off-shine hours and resulted in 5-2℃ higher inside air temperature till the early night hours as compared to ambient air temperature. Nursery of marigold (ornamental plant) is successfully raised using the MRTS inside a 3 m high greenhouse having three stacks at 30°N latitude. Experiments showed that there was almost uniform growth of plants in all the three trays.
机译：在这项研究中，通过开发多机架托盘系统（MRTS），优化了东西向温室（也控制着小气候）内的上部空间，以生产最大数量的苗圃。 MRTS的设计方式是针对一年中不同月份在不同纬度上优化两个连续纸盘（H）之间的垂直距离和纸盘宽度（W），以使上纸盘的阴影不会掉落在下一个。固定高度的温室（例如4 m）中烟囱的数量是特定纬度下正午太阳的最大高度角（α_s）的直接函数。可以看出，即使在冬季，在10°N和20°N的纬度下，α_s仍大于45°（H / W> 1）。这意味着在12月和1月期间，一个4 m高的温室内最多只能有两叠烟囱。计算表明，在纬度为30°N，40°N和50°N的情况下，在12月和1月的冬季，温室内的烟囱数量分别为5、7和12。还开发了与MRTS耦合的瞬态热模型，以预测温室内的土壤，植物和空气温度。可以观察到预测值和测量值非常接近。还可以观察到，由于温室内土壤（托盘中）的质量增加以及对下方地面的传导损失减少，MRTS在植物发芽之前还充当了土壤蓄热系统，在发芽期间将热量储存日照时数和非日照时数相同，与深夜气温相比，直到深夜之前，室内空气温度升高5-2℃。使用MRTS在3 m高的温室中成功培育了万寿菊（观赏植物）的苗圃，该温室在北纬30°时有三层。实验表明，所有三个托盘中的植物几乎均一地生长。

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