Abstract
This study was carried out to optimize a computational model of a new underground passive solar greenhouse to improve thermal performance, storage, and saving of heat solar energy. Optimized and conventional passive solar greenhouse were compared in regards of indoor air temperature, irradiation, and energy demand. Six different materials were used in the conventional model. In addition, TRNSYS software was employed to determine heat demand and irradiation in the greenhouse. The results showed that the annual total heating requirement in the optimized model was 30% lower than a conventional passive solar system. In addition, the resulting average air temperature in the optimized model ranged from −4 to 33.1 °C in the four days of cloud, snow, and sun. The average air temperature in the conventional passive solar greenhouse ranged from −8.4 to 24.7 °C. The maximum monthly heating requirement was 796 MJ/m2 for the Wtype87 model (100-mm lightweight concrete block) and the minimum value was 190 MJ/m2 for the Wtype45 model (50-mm insulation with 200-mm clay tile) in a conventional passive solar greenhouse while the monthly heating requirement estimated 126 MJ/m2 for the optimized greenhouse model. The predictability of the TRNSYS model was calculated with a coefficient of determination (R2) of 95.95%.
Highlights
The energy consumption improvement in a greenhouse is the main problem for greenhouse sustainable agriculture
To better better understand in in thethe present greenhouse model, the comparTo understandthe theoptimization optimization present greenhouse model, the comison was made between thethe data obtained from parison was made between data obtained fromthe thegreenhouse greenhouseinterior interiortemperature, temperature, amount of radiation walls andand floor, andand the amount of demand energyenamount radiationemitted emittedfrom fromthe the walls floor, the amount of demand in the compared between optimized models and conventional passive solar ergy in the TRNSYS compared between optimized models and conventional passive solar greenhouses with different north walls
This paper focused on comparison of greenhouse shape and position design parameter in two models
Summary
The energy consumption improvement in a greenhouse is the main problem for greenhouse sustainable agriculture. Studies focused on the possibilities of greenhouse temperature integration [2] and, thereafter, energy leakage in greenhouse construction was taken into consideration [3,4]. Since the beginning of 20th century, researchers have focused on harvesting energy during the summer to consume during winter in semi-closed greenhouses [5]. This type of greenhouses necessitates heavy investments and are not economical unless enough additional production is anticipated. This problem caused another approach be considered to reduce investment costs
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