A Model Experiment on Reduction of Greenhouse Cooling Load in the Daytime Using Shading Material against Infrared Radiation as Covering Material.

Tanaka, Ikuo; Ishii, Yukitsugu; Ogura, Toichi

doi:10.2525/ecb1963.35.15

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…This type of shading is easy to apply and is useful for greenhouses in northern countries with short summer seasons. In 1997, Tanaka [ 55 ] studied the effect of applying NIR-reflecting coating to a PE film-covered greenhouse in Japan. The coated PE film reduced the PAR transmittance by 30% similar to a commercial shading screen that was tested and cut out 60% of the NIR.…”

Section: Greenhouse Cooling Challenges In Arid Regionsmentioning

confidence: 99%

Covering Materials Incorporating Radiation-Preventing Techniques to Meet Greenhouse Cooling Challenges in Arid Regions: A Review

Abdel-Ghany

Al-Helal

Al‐Zahrani

et al. 2012

The Scientific World Journal

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Cooling greenhouses is essential to provide a suitable environment for plant growth in arid regions characterized by brackish water resources. However, using conventional cooling methods are facing many challenges. Filtering out near infra-red radiation (NIR) at the greenhouse cover can significantly reduce the heating load and can solve the overheating problem of the greenhouse air. This paper is to review (i) the problems of using conventional cooling methods and (ii) the advantages of greenhouse covers that incorporate NIR reflectors. This survey focuses on how the cover type affects the transmittance of photosynthetically active radiation (PAR), the reflectance or absorptance of NIR and the greenhouse air temperature. NIR-reflecting plastic films seem to be the most suitable, low cost and simple cover for greenhouses under arid conditions. Therefore, this review discusses how various additives should be incorporated in plastic film to increase its mechanical properties, durability and ability to stand up to extremely harsh weather. Presently, NIR-reflecting covers are able to reduce greenhouse air temperature by no more than 5°C. This reduction is not enough in regions where the ambient temperature may exceed 45°C in summer. There is a need to develop improved NIR-reflecting plastic film covers.

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Section: Greenhouse Cooling Challenges In Arid Regionsmentioning

confidence: 99%

Covering Materials Incorporating Radiation-Preventing Techniques to Meet Greenhouse Cooling Challenges in Arid Regions: A Review

Abdel-Ghany

Al-Helal

Al‐Zahrani

et al. 2012

The Scientific World Journal

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“…A filter was used which cut out 60% of the NIR and 30% of the PAR. That filter could decrease the cooling load of the greenhouse by about 8% compared with a greenhouse with neutral shading, which only reduced PAR by 30% (Tanaka, 1997). Recently the University of Hanover (Germany) carried out investigations with the NIR-interference pigments of Merck (Germany) integrated in shading paint to selectively reduce NIR inside the greenhouse (von Elsner and Xie, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Recently the research focus is indeed more on developing solid materials with NIR-filtering, like plastic films or glass for greenhouses (Verlodt and Verschaeren, 1997;Hemming et al, 2004;Abdel-Ghany et al, 2001) or 98 moveable screens (Runkle et al, 2002;Tanaka, 1997). Also NIR-filtering shading paint has been developed (von Elsner and Xie, 2003).…”

Section: Introductionmentioning

confidence: 99%

Greenhouse Cooling by Nir-Reflection

Hemming¹,

Kempkes²,

Braak³

et al. 2006

Acta Hortic.

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Wageningen UR investigated the potential of several NIR-filtering methods to be applied in horticulture. In this paper the analysis of the optical properties of available NIR-filtering materials is given including a calculation method to quantify the energy reduction under these materials and to estimate the contribution for greenhouse cooling. It can be concluded that the optimum NIR-filtering material is still not found but there is good potential for further developments. NIR-filtering multilayer coatings applied to plastic film or glass filter out NIR most effectively. NIR-filtering is not desirable during winter-time in most climatic regions. Therefore, NIR-filtering coverings should not be used in unheated greenhouses since they cause an undesirable temperature drop. NIR-filtering white washes still reduce PAR too much. NIR-filtering (moveable) screens could be an alternative in the future. Future studies should also investigate whether it is possible to use the reflected NIR energy for other processes or cost-effectively storage.

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“…Recently the research focussed on developing solid materials with NIR-filtering, like plastic films as greenhouse covering (Verlodt and Verschaeren, 1997;Hemming et al, 2004;Abdel-Ghany et al, 2001) or moveable screens (Runkle et al, 2002;Tanaka, 1997). Also NIR-filtering shading paint is developed (von Elsner and Xie, 2003).…”

Section: Introductionmentioning

confidence: 99%

Filtering Natural Light at the Greenhouse Covering - Better Greenhouse Climate and Higher Production by Filtering Out Nir?

Hemming¹,

Kempkes²,

Braak³

et al. 2006

Acta Hortic.

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Wageningen UR investigated the potentials of several NIR-filtering methods to be applied in Dutch horticulture. NIR-filtering can be done by the greenhouse covering or by internal or external moveable screens. The objective of this investigation was to quantify the effect of different NIR-filtering methods on greenhouse climate, energy saving and growth and production of tomato and to estimate the amount of NIR to be blocked to get positive effects under Dutch climate conditions. In the research is shown that there are technical and economical potentials for filtering NIR by the greenhouse covering or to use a moveable screen, which does not limit ventilation. Tomato production can potentially be increased with 8-12% depending on the NIR-filtering materials used.

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A Model Experiment on Reduction of Greenhouse Cooling Load in the Daytime Using Shading Material against Infrared Radiation as Covering Material.

Cited by 6 publications

References 3 publications

Covering Materials Incorporating Radiation-Preventing Techniques to Meet Greenhouse Cooling Challenges in Arid Regions: A Review

Covering Materials Incorporating Radiation-Preventing Techniques to Meet Greenhouse Cooling Challenges in Arid Regions: A Review

Greenhouse Cooling by Nir-Reflection

Filtering Natural Light at the Greenhouse Covering - Better Greenhouse Climate and Higher Production by Filtering Out Nir?

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