The Influence of Wind Direction on Greenhouse Ventilation

Bailey, B.J.; Robertson, A.P.; Lockwood, Alex

doi:10.17660/actahortic.2004.633.23

Cited by 10 publications

(4 citation statements)

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“…Experiments on GH ventilation are performed either using a scale model in a wind tunnel or in situ [42]. Sase et al [27], Okushima et al [43], Boulard et al [26,44], Lee et al [45], Bailey et al [46], Kacira et al [47], and Teitel et al [48] all analysed scale models of GHs using wind tunnels. In another scale model developed by Montero et al [49], GH was submerged in a flume tank filled with water.…”

Section: Ventilationmentioning

confidence: 99%

Towards a Sustainable Greenhouse: Review of Trends and Emerging Practices in Analysing Greenhouse Ventilation Requirements to Sustain Maximum Agricultural Yield

et al. 2020

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Cultivation in open fields mainly depends on the location and time of farming, which itself highly depends on the quality and quantity of water for irrigation, weather conditions and soil characteristics. Water resources are highly dependent on the limited freshwater resources from the groundwater system, or rainwater. Countries in MENA (the Middle East and North Africa) rely mostly on desalination technologies for agriculture, due to water scarcity. Therefore, greenhouse (GH) agriculture can be developed to succeed in dealing with the water scarcity and provide sufficient sources of agricultural products as a sustainable solution. These indoor agriculture facilities, which are enclosed by transparent covers, can produce different sources of fruits and vegetables, using a controlled amount of water. By reducing the exchange rate of air with the outside environment, which is known as the confinement effects, greenhouses generate a suitable environment for the plants to grow under transparent covers to trap the sunlight. This raises the inside temperature above the maximum threshold levels, especially within the warm season, due to the high solar radiation intensity, having an adverse influence on the microclimate conditions and consequently the crop growth. In order to sustain maximum agricultural yield, greenhouse ventilation is an important parameter in which its trends and emerging practices were reviewed in this study.

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Section: Ventilationmentioning

confidence: 99%

Towards a Sustainable Greenhouse: Review of Trends and Emerging Practices in Analysing Greenhouse Ventilation Requirements to Sustain Maximum Agricultural Yield

et al. 2020

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“…For this wind direction, the ventilation rate is increased when the windward side and/or roof vents are open. Bailey et al (2004) conducted a wind tunnel test for a 5-span Venlo greenhouse and investigated the effect of windward and leeward vent openings on the ventilation rate. It was found that windward ventilation gave higher ventilation rates than leeward ventilation, and the combined windward and leeward ventilation gave higher ventilation rates than the sums of the windward and leeward ventilation rates.…”

Section: Effect Of Wind Directionmentioning

confidence: 99%

Air Movement and Climate Uniformity in Ventilated Greenhouses

Sase¹

2006

Acta Hortic.

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Air movement caused by ventilation in greenhouses is an important factor that affects the uniformity of greenhouse environment and consequently the uniformity of plant growth and quality. Natural ventilation systems have been widely adopted. The studies of the air movement in naturally-ventilated greenhouses have been performed by means of field experiments, laboratory tests such as wind tunnel tests using scale models, and numerical simulations using computational fluid dynamics (CFD) approach. The primary characteristics of the air movement caused by wind and stack effects in a single-span greenhouse are described. Recent studies on the air movement and the uniformity of environment under natural ventilation are reviewed and discussed with respect to the multi-span greenhouses, the effect of plants, the vent configuration, and the effect of wind direction.

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“…The values of this air exchange rate for observations during the measurement period are shown as dependence on wind speed (7). A graphic illustration of this dependence is shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

“…Field research in this area was conducted among others by Bailey [7], Boulard [8], Papadakis [9] and Teitel [10][11]. The models of air exchange due to the new possibilities of using CFD techniques have been partially verified, hence it is possible to use specific relationships to determine the effectiveness of ventilation in other greenhouses.…”

Section: Theoretical Basismentioning

confidence: 99%

Analysis of the influence of selected factors on natural greenhouse ventilation

Grabarczyk

2018

E3S Web Conf.

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Abstract. In greenhouses, in order to maintain proper indoor air temperature, during the period of high values of solar radiation intensity, shading treatments using thermal screens and ventilation are applied. The research was carried out in a mono-span greenhouse in order to determine the effectiveness of natural ventilation. The object of analysis is a greenhouse with a thermal screen installed inside. The tests were carried out during the summer days. The effect of the research was to determine the ventilation air flow through the vents of the greenhouse on the basis of measurements and calculation analyzes. The dependence of the air flow on the windward and leeward side was determined from the wind speed and the temperature difference between the indoor and outdoor air. On the basis of calculations made from observation during shading of the cultivated area and with open ventilators, the coefficients of air exchange per unit floor area of the greenhouse were determined. It was established that at a wind speed exceeding 0.8 m/s, the air exchange rate in the tested greenhouse exceeds the value recommended by the American Society of Agricultural Engineers of 0.04 m 3 /(s . m 2 ).

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The Influence of Wind Direction on Greenhouse Ventilation

Cited by 10 publications

References 0 publications

Towards a Sustainable Greenhouse: Review of Trends and Emerging Practices in Analysing Greenhouse Ventilation Requirements to Sustain Maximum Agricultural Yield

Towards a Sustainable Greenhouse: Review of Trends and Emerging Practices in Analysing Greenhouse Ventilation Requirements to Sustain Maximum Agricultural Yield

Air Movement and Climate Uniformity in Ventilated Greenhouses

Analysis of the influence of selected factors on natural greenhouse ventilation

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