Energetic performance test of an underground air tunnel system for greenhouse heating

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dc.contributor.authorOzgener, Leyla
dc.contributor.authorOzgener, Onder
dc.date.accessioned2019-10-27T21:14:33Z
dc.date.available2019-10-27T21:14:33Z
dc.date.issued2010
dc.departmentEge Üniversitesien_US
dc.description.abstractThe main objective of the present study is to investigate the performance characteristics of an underground air tunnel (UAT) for greenhouse heating with a 47 m horizontal, 56 cm nominal diameter U-bend buried galvanized ground heat exchanger. This system was installed in the Solar Energy Institute, Ege University, Izmir, Turkey. Based upon the measurements made in the heating mode, the average heat extraction rate to the soil is found to be 3.77 kW, or 80.21 W/m of tunnel length, while the required tunnel length in meters per kW of heating capacity is obtained as 12.46. The entering air temperature to the tunnel ranges from 14.3 to 21.5 degrees C, with an average value of 15.5 degrees C. When the system operates, the greenhouse air is at a minimum day temperature of 13.1 degrees C with a relative humidity of 32%. The maximum heating coefficient of performance of the UAT system is about 6.42, while its minimum value is about 0.98 at the end of a cloudy and cold day and fluctuates between these values at other times. The daily average maximum COP values for the system are also obtained to be 6.42. The total average COP in the heating season is found to be 5.16. (C) 2010 Elsevier Ltd. All rights reserved.en_US
dc.description.sponsorshipEge UniversityEge University [09GEE003]en_US
dc.description.sponsorshipThe authors are grateful for the financial support provided for the project under project grant no. of 09GEE003 by Ege University Research Fund.en_US
dc.identifier.doi10.1016/j.energy.2010.06.020
dc.identifier.endpage4085en_US
dc.identifier.issn0360-5442
dc.identifier.issn0360-5442en_US
dc.identifier.issue10en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage4079en_US
dc.identifier.urihttps://doi.org/10.1016/j.energy.2010.06.020
dc.identifier.urihttps://hdl.handle.net/11454/43401
dc.identifier.volume35en_US
dc.identifier.wosWOS:000282503500012en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherPergamon-Elsevier Science Ltden_US
dc.relation.ispartofEnergyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectEnergyen_US
dc.subjectGeothermal energyen_US
dc.subjectUnderground air tunnelen_US
dc.titleEnergetic performance test of an underground air tunnel system for greenhouse heatingen_US
dc.typeArticleen_US

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