Renewable Energy Resources and Technologies
Mehran Gheyrati; Asadollah Akram; Hassan Ghasemi-Mobtaker
Abstract
The orientation of greenhouses is one of the effective factors in terms of radiation they receive. In the present study, a multi-span greenhouse (40 m × 93.5 m with a coverage area of 5457.44 m2) located in the central region of Iran was investigated in three orientations including: North-South ...
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The orientation of greenhouses is one of the effective factors in terms of radiation they receive. In the present study, a multi-span greenhouse (40 m × 93.5 m with a coverage area of 5457.44 m2) located in the central region of Iran was investigated in three orientations including: North-South (N-S), East-West (E-W), and Northeast-Southwest (NE-SW: the most frequent orientation of the existing greenhouses in the study area). The solar irradiation received on the outside surface of the greenhouse cover and the amount of irradiation captured inside the greenhouse for each orientation during the cold season were calculated using mathematical modeling and the results were compared. According to the results, in the E-W orientation, the main sections of receiving solar irradiation, such as the south and north roofs, have a better angle toward the sun; therefore, the quantity of solar irradiation captured inside the greenhouse with the E-W orientation was on average 361.48 MJ day-1 more than that with the N-S orientation. The north wall of the greenhouse could not receive the beam radiation for all the orientations investigated, and the total irradiation captured by this section was composed of the diffused radiation and the ground-reflected radiation, which is an important result for insulation of some surfaces of greenhouses.
Akram Abdulameer Abbood Al-Khazzar; Aseel Jamal Khaled
Abstract
In Iraq, solar radiation field measurements are available only for very ...
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In Iraq, solar radiation field measurements are available only for very limited locations such as some universities and research centers. This article reviews and compares the measured monthly averaged global solar radiation data for Iraqi provinces and cities available in the literature and studies over the internet especially Google Scholar, Research Gate and IASJ. The selected locations are Baghdad, Mosul, Tikrit, Rutba, Nasiriya, Kirkuk, Haditha, and Najaf. The measured data is compared with the corresponding available satellite data from NASA and Meteonorm software and Root mean square error is calculated to test NASA and Meteonorm performance. The review results show that the maximum GSR in July in Haditha (8.3 kWhr/m2) while the minimum is in Mosul city in December (1.68 kWhr/m2). Baghdad measured monthly mean is about 5.20 kWhr/m2.