Determination of Effects of Outdoor Relative Humidity on Fan Pad Cooling Effects in Greenhouses

• Autorzy: Hasan Öz , Atılgan Atılgan
• Języki publikacji: EN

Abstrakty

EN

Greenhouses are agricultural buildings where production takes place throughout the year. In greenhouse cultivation, the objective is to ensure economically highest yield by means of adjusting the greenhouse indoor climatic conditions. During summer, cooling is needed in order to prevent overheating in greenhouse. The cooling in greenhouses is carried out via fan pad cooling systems. Hereby study aims at determining the effects of highest and lowest local humidity on indoor temperature changes, through detection of the influence of outdoor relative humidity on the system efficiency and cooling rates. The research is realised in the 24 m long, 10 m wide glasshouse in the city of Isparta. It is found out that temperature reduction values in greenhouse are highly influenced by the local highest and lowest relative humidity. According to the outcomes of the study, in a day when the outdoor relative humidity is low, temperature level rises around 6-7o C compared to a day with higher humidity; therefore, the outdoor relative humidity comes up as a significant parameter for improving system efficiency. It is concluded that the most suitable hours for starting the system is 9.00-10.00 a.m., when the temperature begins to increase, for a more cooling efficiency.(original abstract)

Słowa kluczowe

EN

Crop production; Water management; Research results

PL

Produkcja roślinna; Gospodarka wodna; Wyniki badań

• Czasopismo: Infrastruktura i Ekologia Terenów Wiejskich
• Rocznik: 2015
• Numer: nr III/2
• Strony: 759--767

Twórcy

autor

Hasan Öz

• University of Suleyman Demirel in Isparta

autor

Atılgan Atılgan

• University of Suleyman Demirel in Isparta

Bibliografia

• Arıcı, I, 1999. Greenhouse Production Technique. Uludağ University, Agricultural Faculty Press. Bursa, Turkey, 44pp.
• Bucklin, R.A., R.W. Henley and D.B. McConnell, 1993. Fan and pad greenhouse evaporative cooling systems. University of Florida, Florida Cooperative Extension Service, Circular 1135p.
• Cemek, B., S. Karaman and A. Unlukara, 2006. Indoor climate requirements of greenhouses in Tokat region, JAFAG, 23(1): 25-36.
• Dağtekin, M. and Y. Yıldız, 1996. Alternative cooling problem solving methods towards the Çukurova region. Agricultural Machinery and Energy, Ankara (Turkey). Sept. 15-17. Pp: 142-151
• Davies, P.A., 2005. A solar cooling system for greenhouse food production in hot climates. Solar Energy 79: 661-668.
• Fuchs, M., E. Dayan and A. Presnov, 2006. Evaporative cooling of a ventilated greenhouse rose crop. Agricultural and Forest Meteorology 138: 203-215.
• Jain, D. and G.N. Tiwari, 2002. Modeling and optimal design of evaporative cooling system in controlled environment greenhouse. Energy Conversion and Management 43: 2235-2250.
• Kittas, C, T. Bartzanas and A. Jaffrin, 2003. Temperature gradients in a partially shaded large greenhouse equipped with evaporative cooling pads. Biosystems Engineering, 85(1): 87-94.
• Kocabaş, Z., M.M. Özkan and E. Başpınar, 2013. Basic biometrics, Ankara University, Agricultural Faculty Press. Ankara, Turkey, 381p.
• Kocatürk, Ü., 2007. Evaporative effectivities and amount of evaporated water of evaporative pad cooling sysyems at different air veloties in Çukurova region. Master's thesis. Çukurova University, Agricultural Faculty, Adana, Turkey. 77pp. Koç, N. and Y.
• Koç, 2008. Some performace characteristics cooling efficiencies, temperature depressions and amount of evaporated water of evaporative cooling padmade of cellulose at different water flow in çukurova regions. Cukurova University Journal of Natural and Applied Sciences, 17(3): 97-106.
• Ones, A., 1986. Greenhouse Production Technique. 2. Eds. Ankara University, Agricultural Faculty Press. 1165, Ankara, Turkey, 286pp.
• Ozbugan, C., 1995. Evaporative cooling. Master's thesis. Yıldız Teknik University, Machine Engineering, İstanbul, Turkey. 54pp.
• Öz, H., 2007. Determination of fan pad system efficiency of greenhouses in Isparta region, Master's thesis. Suleyman Demirel University, Agricultural Faculty, Isparta, Turkey. 62pp
• Öztürk, H.H. and A. Başçetinçelik, 2002. Cooilng in greenhouse. Çukurova Univsersity Agricultural Faculty, Agriculture Machinery Dep. Adana, Turkey, 296pp.
• Uğurlu, N. And M. Kara, 2000. The cooling performance of wet pads and their effect on reduction of the ınside temperature a cage house. Turk J Agric For, 24: 79-86.
• Yağcıoğlu, A., 2005. Greenhouse mechanisation, Ege University Agricultural Faculty, Agriculture Machinery Dep. İzmir, Turkey, 363pp.
• Yağcıoğlu, A., T. Günhan and V. Demir, 2006. Evaporative Cooling in Agricultural Buildings, J Agr Mach, 2(4): 381-388.
• Yüksel, A.N., 2000. Greenhouse Production Technique, Hasad Publication, İstanbul, Turkey. 288pp.

Identyfikatory

DOI

http://dx.medra.org/10.14597/infraeco.2015.3.2.060