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Effect of Shape and Orientation on the Thermal Performance of Greenhouses in the Western USA

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2021 ASABE Annual International Virtual Meeting  2100876.(doi:10.13031/aim.202100876)
Authors:   Brenna Gracely, Kathryn Tarver, Hannah Josifek, Md Shamim Ahamed
Keywords:   greenhouse shape, orientation, thermal model, energy efficiency, heating loads, and cooling loads.    

Abstract: Crop production in a controlled environment setting in Mediterranean regions has become popular due to the increased negative impacts of climate change. However, the greenhouse energy costs, especially the heating and cooling costs, depend heavily on the greenhouse's shape and orientation. Previous studies recommended various shapes and different orientations for greenhouse all over the world. A quasi-steady state thermal model known as GREENHEAT was developed to simulate conventional greenhouses' hourly heating requirements over a year. Currently, the GREENHEAT model does not address the transient air turnover rate due to ventilation in the greenhouse, which could significantly affect energy demand, especially under cooling mode. This study integrated a ventilation sub-model to simulate the air-excahnge under ventilation mode to account for the effect of varying air exchange. Finally, this study analyzes the impact of various greenhouse shapes and orientations on heating and cooling loads in three climates representing major agricultural regions in California.

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