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

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dc.contributor.authorOzgener L.
dc.contributor.authorOzgener O.
dc.date.accessioned2024-07-22T08:21:13Z
dc.date.available2024-07-22T08:21:13Z
dc.date.issued2010
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°C, with an average value of 15.5°C. When the system operates, the greenhouse air is at a minimum day temperature of 13.1°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. © 2010 Elsevier Ltd.
dc.identifier.DOI-ID10.1016/j.energy.2010.06.020
dc.identifier.issn03605442
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/18512
dc.language.isoEnglish
dc.publisherElsevier Ltd
dc.subjectIzmir [Turkey]
dc.subjectTurkey
dc.subjectAtmospheric humidity
dc.subjectGreenhouses
dc.subjectSolar energy
dc.subjectAir temperature
dc.subjectAverage values
dc.subjectEnergy
dc.subjectEnergy Institute
dc.subjectGreenhouse air
dc.subjectGreenhouse heating
dc.subjectGround heat exchangers
dc.subjectHeat extraction rate
dc.subjectHeating capacity
dc.subjectHeating coefficients
dc.subjectHeating mode
dc.subjectHeating season
dc.subjectMaximum COP
dc.subjectMinimum value
dc.subjectPerformance characteristics
dc.subjectPerformance tests
dc.subjectRelative humidities
dc.subjectUnderground air tunnel
dc.subjectair temperature
dc.subjectgeothermal energy
dc.subjectheating
dc.subjectinstallation
dc.subjectperformance assessment
dc.subjectrelative humidity
dc.subjectsolar power
dc.subjecttunnel
dc.subjectunderground construction
dc.subjectHeating
dc.titleEnergetic performance test of an underground air tunnel system for greenhouse heating
dc.typeArticle

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