Determining the optimum orientation of a greenhouse on the basis of the total solar radiation availability

Dragićević, Snežana

doi:10.2298/tsci100220057d

Cited by 28 publications

(15 citation statements)

References 7 publications

(7 reference statements)

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“…Comparing with N-S orientation for a single-span greenhouse, the E-W oriented greenhouse receives 51.8% more solar radiation in December but 20.1% less in June, thus need less heating in winter and less cooling in summer. A similar trend of solar gain in the single-span greenhouses with orientations also reported in other studies, 6,35 however, that the intensity of solar gain could be significantly different depending on the location of greenhouses. Figure 5 shows the solar radiation availability in an E-W and N-S oriented 6-span gable roof greenhouse.…”

Section: Energy-efficient Orientationsupporting

confidence: 88%

Energy-efficient design of greenhouse for Canadian Prairies using a heating simulation model

2018

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Summary Greenhouses in northern climates require a large amount of supplemental heating for growing crops in winter seasons, so energy‐efficient design of greenhouses based on local climate is important to minimize the heating demand. In this study, greenhouse design parameters including shape, orientation, the angle of the roof, and width of the span have been studied for the conceptual design of conventional greenhouses for Canadian Prairies using a heating simulation model. Five different shapes of greenhouses including even‐span, uneven‐span, modified arch, vinery, and quonset shape have been selected for the study. The simulation results proved that the uneven‐span gable roof shape receives the highest solar radiation, whereas the quonset shape receives the lowest solar radiation. However, the quonset shape greenhouse requires about 7.6% less annual heating as compared to the gable roof greenhouse, but the quonset would not be adopted as multispan greenhouses. Therefore, the gable roof greenhouse is considered as energy efficient for the multispan gutter connected greenhouses whereas quonset shape as a free‐standing single‐span greenhouses. In high northern latitudes, the greenhouse with east‐west orientation is more energy efficient from heating and cooling point of view when the length‐width ratio of the greenhouse is more than 1. The heating energy saving potential of the large span width in single‐span greenhouses is relatively higher as compared to the multispan greenhouses.

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Section: Energy-efficient Orientationsupporting

confidence: 88%

Energy-efficient design of greenhouse for Canadian Prairies using a heating simulation model

2018

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“…The value of I LRS and I LRC can be calculated using Eqs 6 and 7 . In the above equations, I LRS consists of two parts ( Eq 6 ), one is solar direct radiation and the other is solar diffuse radiation [ 26 ]. Where I n is the amount of solar direct radiation on the normal plane (W/m 2 ); I s stands for the amount of solar diffuse radiation on the normal plane (W/m 2 ); h and A 1 respectively refer to the solar altitude angle and solar azimuth angle (°); θ and α represent the lighting roof angle and azimuth angle of CSG, respectively (°).…”

Section: Methodsmentioning

confidence: 99%

Effects of orientation and structure on solar radiation interception in Chinese solar greenhouse

Zhang

et al. 2020

PLoS ONE

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In order to further improve the utilization of solar energy in Chinese Solar Greenhouse (CSG), this paper systematically studied the effects of orientation and structure on solar radiation interception in CSG. A solar radiation model has been developed based on the previous research, which taking solar motion law, meteorological data, and optical properties of materials into consideration. The established model was used to optimize the orientation and structure of CSG. The analysis of structure considered two major structural parameters, which are the ridge height and the horizontal projection of the rear roof. Moreover, the widely used Liao-Shen type Chinese solar greenhouse (CSG-LS) has been taken as the prototype in the present research, and the measured data of the typical clear day was used for the model validation. The results showed that the ridge height has a remarkable influence on the solar energy captured by CSG-LS. Compared with the optimization of a single factor, the comprehensive optimization of orientation and structure can increase the solar radiation interception of the rear wall by 3.95%. Considering the limiting factor of heat storage-release capacity and the shading effect on the greenhouse structure, the optimal lighting construction of the CSG-LS (with a span of 9.0 m) was specified as 7~9° from south to west of azimuth angle, 4.5~4.7 m ridge height, and 1.4~1.6 m horizontal projection of the rear roof at 42°N latitude. The proposed solar radiation model can provide scientific guidance for the CSG-LS construction in different areas.

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“…The inherent interactions among these parameters make rigorous designs quite complex. Fortunately, the solar greenhouse is a forgiving and adjustable technology so that relatively crude designs are adequate (Rahman, 2007;Dragićević, 2011;IEA-SHC, 1998;Roberts, 2005). Various aspects of greenhouse dryer design are discussed below.…”

Section: Greenhouse (Gh) Designsmentioning

confidence: 99%

“…The natural "chimney effect" of the convection of air through the greenhouse is based on the difference in air density (due to temperature difference) between indoor and outdoor air. The volumetric flow of air (V air , m 3 /h) by natural convention through the greenhouse as depicted in Figure 5 is given by (Dragićević, 2011): It follows from Equation 1 that the ventilation rate and the temperature within the greenhouse dryer can be controlled by manipulating the stack height, along with the inlet and outlet vent openings.…”

Section: Ventilationmentioning

confidence: 99%

Mass-Heater Supplemented Greenhouse Dryer for Post-Harvest Preservation in Developing Countries

Akinjiola¹,

Balachandran²

2012

JSD

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A mass-heater supplemented greenhouse dryer is shown to be an adaptable technology to post-harvest preservation problems in developing countries. Inadequate harvest preservation in these countries often leads to a cycle of bumper harvest and production cutbacks, famine, inability of famers to get their harvest to the market, low quality of exports, and low agro-processing. Drying is a preservation technique that is readily adaptable for developing countries, and the earliest form of this method, open air drying, is still predominant. Rigorous designs are not always possible or economical, but the greenhouse dryer will always outperform open air drying irrespective of the quality of its design. Greenhouse dryer design parameters are identified, and guidelines for optimizing performance are provided. Mass-heaters based on rocket or top-lit-up-draft heaters, fueled by agricultural wastes, are proposed as supplementary heat sources when the sun is not available at night or during cloudy periods

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Determining the optimum orientation of a greenhouse on the basis of the total solar radiation availability

Cited by 28 publications

References 7 publications

Energy-efficient design of greenhouse for Canadian Prairies using a heating simulation model

Energy-efficient design of greenhouse for Canadian Prairies using a heating simulation model

Effects of orientation and structure on solar radiation interception in Chinese solar greenhouse

Mass-Heater Supplemented Greenhouse Dryer for Post-Harvest Preservation in Developing Countries

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