Evaluation of optical properties and thermal performances of different greenhouse covering materials

Al-Mahdouri, Adil; Baneshi, Mehdi; Gonome, Hiroki; Okajima, Junnosuke; Maruyama, Shigenao

doi:10.1016/j.solener.2013.06.029

Cited by 52 publications

(26 citation statements)

References 33 publications

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“…Two CM11 radiometers covered by the plastic film and one CM21 radiometer not covered were placed horizontally side by side from 23 June to 5 July 2007. is then calculated as the ratio of CM11 to CM21 measurements, and values derived from the two CM11 radiometers were very close to each other. The averaged was 0.88 ± 0.02 during the measurement period, which is close to the shortwave transmittance of the plastic film (∼0.90) given by Al-Mahdouri et al (2013). Thus, the film reflectance was set to vary from 0.04 to 0.12.…”

Section: Incident Radiationmentioning

confidence: 86%

Increase in surface albedo caused by agricultural plastic film

Fan

Chen

Xia

et al. 2014

Atmospheric Science Letters

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The area of agricultural greenhouses and cropland covered by plastic film has increased in China over the past three decades. Construction of large-area plastic greenhouse potentially changes the physical and radiative properties of the surface and its albedo, thereby potentially affecting the surface energy budget and climate change. This study aims to investigate the effect of the plastic-film cover on surface albedo based on computations with a simplified model and several field observation experiments. The results showed that surface albedo increased by ∼23.5 and ∼33.9% on clear and overcast days, respectively, if grassland was covered by plastic film. Surface albedo of bare soil covered by plastic film increased by ∼16.6% under clear sky conditions. A larger increase in surface albedo was derived for surface types with smaller surface albedo. Model calculations were in good agreement with field observations.

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Section: Incident Radiationmentioning

confidence: 86%

Increase in surface albedo caused by agricultural plastic film

Fan

Chen

Xia

et al. 2014

Atmospheric Science Letters

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“…Experiments were conducted during the growing period of December 2016-June 2017 in three identical arched roof greenhouses, north-south oriented, located at the University of Thessaly experimental farm (latitude 39 ∘ 22 ′ N, longitude 22 ∘ 44 ′ E, altitude 85 m). Each greenhouse had the following constructional characteristics: eaves height: 2.9 m; ridge height: 4.1 m; total width: 8 m; total length: 20 m; ground area: 160 m 2 ; volume: 524 m 3 . Moreover, ventilation was implemented through automatically controlled vents (Argos Electronics, Athens, Greece): two continuous side roll-up windows (total opening area of 27 m 2 ) and a flap roof window (total opening area of 18 m 2 ).…”

Section: Greenhouse Facilities and Growing Conditionsmentioning

confidence: 99%

“…Greenhouse production of horticultural crops is associated with high production costs, especially in the case of out‐of‐season production and heating systems where conventional fuels are used. To overcome this problem, various new technologies have been introduced during the last few decades for the production of new greenhouse covering materials that could allow for more efficient climate control within the greenhouse environment, with special interest in optical properties and thermal performance of these materials . Most of these technologies focus on producing greenhouse claddings with light‐manipulating properties, such as photo‐selective films, shading nets, UV‐blocking films and double‐layer films among others, that could minimize energy losses and increase yield without disproportional increase in energy inputs .…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this problem, various new technologies have been introduced during the last few decades for the production of new greenhouse covering materials that could allow for more efficient climate control within the greenhouse environment, 1,2 with special interest in optical properties and thermal performance of these materials. 3 Most of these technologies focus on producing greenhouse claddings with light-manipulating properties, such as photo-selective films, shading nets, UV-blocking films and double-layer films among others, that could minimize energy losses and increase yield without disproportional increase in energy inputs. [4][5][6] However, reduction in energy consumption from covering materials is usually associated with reduced light availability to plants, with reduced yields and effects on the end product quality being expected.…”

Section: Introductionmentioning

confidence: 99%

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The effect of covering material on the yield, quality and chemical composition of greenhouse‐grown tomato fruit

et al. 2019

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BACKGROUND During the last few decades, greenhouse technology for horticultural crops has focused on retaining optimum conditions within the greenhouse environment that could allow for a compromise between maximum yields and minimum production costs. The aim of this study was to evaluate the effect of three greenhouse covering materials and five harvesting dates on the yield and quality parameters of hydroponically produced tomato fruit, as well as on energy consumption. RESULTS Plants had a higher growth rate at early stages for S‐PE cover material, while differences were minimized at later stages. Tocopherol content was the highest for ID‐PE material and harvesting later than 170 days after transplanting (DAT), while sugar content (fructose and glucose) was the highest for S‐PE material and 157 DAT. Organic acid content was the highest at early harvestings, especially for 7‐PE and S‐PE cover materials, while it exhibited decreasing trends at later harvesting dates. Antioxidant properties showed a varied response to cover materials and harvesting dates, while β‐carotene, carotenoids and chlorophylls were the highest for 7‐PE material. CONCLUSIONS The results showed that both cover materials and harvesting date may affect significantly tomato fruit quality, especially sugar and organic acid contents which are associated with fruit taste, as well as tocopherols which contribute to antioxidant properties and pigments that are associated with fruit ripening and earliness of marketable maturity. © 2018 Society of Chemical Industry

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“…A greenhousecovering material should possess good heat insulation properties by allowing shortwave radiation into the greenhouse, yet being opaque to infrared radiation. To manage greenhouse energy effectively, it is important to understand the thermal behavior of the glazing materials (Al-Mahdouri et al, 2013). The amount of energy required for heating depends on the thermal efficiency of the building and it is likely to be higher under severe climate conditions.…”

Section: Introductionmentioning

confidence: 99%

Development of a model to calculate the overall heat transfer coefficient of greenhouse covers

Rasheed

Lee

2018

Span. j. agric. res.

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A Building Energy Simulation (BES) model based on TRNSYS, was developed to investigate the overall heat transfer coefficient (U-value) of greenhouse covers including polyethylene (PE), polycarbonate (PC), polyvinyl chloride (PVC), and horticultural glass (HG). This was used to determine the influences of inside-to-outside temperature difference, wind speed, and night sky radiation on the U-values of these materials. The model was calibrated using published values of the inside and outside convective heat transfer coefficients. Validation of the model was demonstrated by the agreement between the computed and experimental results for a singlelayer PE film. The results from the BES model showed significant changes in U-value in response to variations in weather parameters and the use of single or double layer greenhouse covers. It was found that the U-value of PC, PVC, and HG was 9%, 4%, and 15% lower, respectively, than that for PE. In addition, by using double glazing a 34% reduction in heat loss was noted. For the given temperature U-value increases as wind speed increases. The slopes at the temperature differences of 20, 30, 40, and 50 °C, were approximately 0.3, 0.5, 0.7, and 0.9, respectively. The results agree with those put forward by other researchers. Hence, the presented model is reliable and can play a valuable role in future work on greenhouse energy modelling.

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Evaluation of optical properties and thermal performances of different greenhouse covering materials

Cited by 52 publications

References 33 publications

Increase in surface albedo caused by agricultural plastic film

Increase in surface albedo caused by agricultural plastic film

The effect of covering material on the yield, quality and chemical composition of greenhouse‐grown tomato fruit

Development of a model to calculate the overall heat transfer coefficient of greenhouse covers

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