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 WJET  Vol.3 No.3 B , August 2015
Technology and Studies for Greenhouse Cooling
Abstract: Greenhouse technology is an efficient and viable option, especially for the sustainable crop production in the regions of adverse climatic conditions. High summer temperature is one of the worst effects on greenhouse crop production throughout the year. The main purpose of this paper is to present some technologies and studies for greenhouse cooling in summer. In the paper, some applicable and practical cooling technologies have been discussed. The choice of efficient cooling method depends on many aspects, such as local climate, agronomic condition, design and covering materials. To achieve desirable benefits, the combination of different cooling methods is necessarily used. Analysis of earlier studies revealed that a naturally ventilated greenhouse with larger ventilation areas (15% - 30%), provided at the ridge and side covered with insect-proof nets of 20 - 40 mesh size with covering material properties of NIR (near infrared radiation) reflection during the day and FIR (far infrared radiation) reflection during night was suitable for greenhouse production throughout year in some special regions. Evaporation cooling is the most effective cooling method for controlling the temperature and humidity inside a greenhouse. However, its suitability is restricted to the respective region and climate when the humidity level is high. The entry of unwanted radiation or light can be controlled by the use of shading. Researches show that shade net application with different perforated mesh size and their evaluation with respect to local climate and region are necessary to get cooling benefits in summer.
Cite this paper: Li, H. and Wang, S. (2015) Technology and Studies for Greenhouse Cooling. World Journal of Engineering and Technology, 3, 73-77. doi: 10.4236/wjet.2015.33B012.
References

[1]   Sethi, V.P. and Sharma, S.K. (2007) Experimental and Economic Study of a Greenhouse Thermal Control System Using Aquifer Water. Energy Conversion and Management, 48, 306-319. http://dx.doi.org/10.1016/j.enconman.2006.04.003

[2]   Wang S.X. and Wang, X. (2009) Ventilation Rate of Various Vents in Plastic Covered Multi-Span Greenhouse. Transaction of the CSAE, 25, 248-251.

[3]   Teitel, M. and Tanny, J. (1999) Natural Ventilation of Greenhouses: Experiments and Model. Agricultural and Forest Meteorology, 96, 59-71. http://dx.doi.org/10.1016/S0168-1923(99)00041-6

[4]   Teitel, M., Liran, O., Tanny, J. and Barak, M. (2008) Wind Driven Ventilation of a Mono-Span Greenhouse with a Rose Crop and Continuous Screened Side Vents and Its Effect on Flow Patterns and Micro Climate. Biosystems Engineering, 101, 111-122. http://dx.doi.org/10.1016/j.biosystemseng.2008.05.012

[5]   Teitel, M., Tanny, J. and Barak, M. (2007) Wind Driven Ventilation of a Mono-Span Greenhouse with a Rose Crop and Continuous Screened Side Vents and Its Effect on Flow Patterns and Micro Climate. Biosystems Engineering, 101, 111-122.

[6]   Impron, I., Hemming, S. and Bot, G.P.A. (2007) Simple Greenhouse Climate Model as a Design Tool for Greenhouses in Tropical Low Land. Biosystems Engineering, 98, 79-89.

[7]   Kozai, T. and Sase, S. (1978) A Simulation of Natural Ventilation for a Multi-Span Green-house. Acta Horticulturae, 87, 39-49. http://dx.doi.org/10.17660/actahortic.1978.87.3

[8]   Landsberg, J.J., White, B. and Thorpe, M.R. (1979) Computer Analysis of the Efficacy of Evaporative Cooling for Glasshouse in High Energy Environments. Journal of Agricultural Engineering Research, 24, 29-39. http://dx.doi.org/10.1016/0021-8634(79)90058-1

[9]   Chandra, P., Singh, J.K. and Majumdar, G. (1989) Some Re-sults of Evaporative Cooling of a Plastic Greenhouse. Journal of Agricultural Engineering, 26, 274-280.

[10]   Jain, D. and Tiwari, G.N. (2002) Modeling and Optimal Design of Evaporative Cooling System in Controlled Environment Greenhouse. Energy Conversion and Management, 43, 2235-2250. http://dx.doi.org/10.1016/S0196-8904(01)00151-0

[11]   Ahmed, E.M., Abaas, O., Ahmed, M. and Ismail, M.R. (2011) Performance Evaluation of Three Different Types of Local Evaporative Cooling Pads in Greenhouses in Sudan. Saudi Journal of Biological Sciences, 18, 45-51. http://dx.doi.org/10.1016/j.sjbs.2010.09.005

[12]   Montero, J.I., Anton, A., Beil, A. and Franquet, C. (1994) Cooling of Greenhouse with Compressed air Fogging Nozzles. Acta Horticulturae, 281,199-209.

[13]   Arbel, A., Yekutieli, O. and Barak, M. (1999) Performance of a Fog System for Cooling Greenhouses. Journal of Agricultural Engineering Research, 72,129-136. http://dx.doi.org/10.1006/jaer.1998.0351

[14]   Arbel, A., Barak, M. and Shklyar, A. (2003) Combination of Forced Ventilation and Fogging Systems for Cooling Greenhouses. Biosystems Engineering, 84, 45-55. http://dx.doi.org/10.1016/S1537-5110(02)00216-7

[15]   Cohen, Y., Stanhill, G. and Fuchs, M. (1983) An Experi-mental Comparison of Evaporative Cooling in a Naturally Ventilated Glasshouse Due to Wetting the Outer Roof and Inner Crop Soil Surfaces. Agricultural and Forest Meteorology, 28, 239-251. http://dx.doi.org/10.1016/0002-1571(83)90029-8

[16]   Sutar. and Tiwari (1995) Analytical and Numerical Study of a Controlled Environment Agricultural System for Hot and Dry Climatic Conditions. Energy and Building, 23, 9-18. http://dx.doi.org/10.1016/0378-7788(95)00919-O

[17]   Willits, D.H. and Preet, M.M. (2000) Intermittent Application of Water to an Externally Mounted Greenhouse Shade Cloth to an Modify Cooling Performance. Transactions of ASAE, 43, 1247-1252. http://dx.doi.org/10.13031/2013.3018

[18]   Ali, H.M., Moustafa, S. and El-Mansy, H. (1990) An Efficient Greenhouse Design for Hot Climates. Energy Conversion Management, 30, 433-437. http://dx.doi.org/10.1016/0196-8904(90)90044-Y

[19]   Hu, J. (2013) Experimental Research on Monomial Cooling Measure of Greenhouse in Summer. Smart Grid and Renewable Energy, 4, 48-52. http://dx.doi.org/10.4236/sgre.2013.41007

 
 
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