Browsing by Author "Goswami D.Y."
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Item Experimental prediction of total thermal resistance of a closed loop EAHE for greenhouse cooling system(2011) Ozgener O.; Ozgener L.; Goswami D.Y.The design of an earth to air heat exchanger (EAHE) requires knowledge of its total thermal resistance (RTot) for heating and cooling applications. In this research, a 47m long horizontal, 56cm nominal diameter U-bend buried galvanized was studied experimental EAHE used for the determination and evaluation of thermal properties of heat exchanger. This system was designed and installed in the Solar Energy Institute, Ege University, Izmir, Turkey. Based on the experimental results, generalized relationships were developed for predicting of thermal resistance of the heat exchanger. Average total heat exchanger thermal resistance was estimated to be 0.021K-m/W as a constant value under steady state condition. © 2011 Elsevier Ltd.Item Seven years energetic and exergetic monitoring for vertical and horizontal EAHE assisted agricultural building heating(Elsevier Ltd, 2017) Ozgener O.; Ozgener L.; Goswami D.Y.This study presents an experimental investigation of the thermodynamics performance (efficiency) of a closed-loop vertical and horizontal earth-to-air heat exchanger (underground air tunnel) in the heating mode. The experimental system was commissioned in June 2009 and the data have been collected since then. The data, consisting of hourly measurement records for heating periods between 2009 and 2016, were measured at the Solar Energy Institute of the Bornova Campus at Ege University. At the present time, the database contains more than 80,000 records of measurements. First and second law efficiency values of the system and its components have been analyzed. Monthly and yearly average energetic and exergetic efficiencies of the system and its components at various reference states are also determined. © 2017 Elsevier Ltd