Research Papers

Three Cooling Seasons Monitoring of Exergetic Performance Analysis of an EAHE Assisted Solar Greenhouse Building

[+] Author and Article Information
Onder Ozgener

Solar Energy Institute, Ege University,
35100 Bornova-Izmir, Turkey
e-mail addresses: oo36@cornell.edu and

Leyla Ozgener

Department of Mechanical Engineering Faculty of Engineering,
Celal Bayar University Muradiye,
45140 Manisa, Turkey
e-mail addresses: lo64@cornell.edu and

1Present address: Visiting Professor in Cornell Energy Institute, Cornell University, 2102 A Snee Hall, 14853, Ithaca, NY.

2Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received February 28, 2012; final manuscript received August 21, 2012; published online November 28, 2012. Assoc. Editor: Gregor P. Henze.

J. Sol. Energy Eng 135(2), 021007 (Nov 28, 2012) (7 pages) Paper No: SOL-12-1060; doi: 10.1115/1.4007938 History: Received February 28, 2012; Revised August 21, 2012

The present manuscript experimentally investigated the exergetic performance (efficiency) of a closed loop earth to air heat exchanger (underground air tunnel) in the cooling mode. The experimental system was commissioned in June 2009 and experimental data collecting have been conducted since then. The data, consisting of hourly thermodynamics records a year cooling period, 2009–2011, were measured in the Solar Energy Institute of the Bornova Campus at Ege University. At the present time, the database contains more than 40,000 records of measurements. Exergetic efficiencies value of the system and system components have been analyzed. Furthermore, a long term exergetic modeling of a closed loop earth-to-air heat exchanger solar greenhouse cooling system for system analysis and performance assessment is presented. Exergetic efficiency of the system and its compenents at various reference states are also determined.

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Fig. 1

Basic simplified PV assisted EAHE system schema adopted from Refs. [7-10,12]

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Fig. 2

Average monthly monitored values of ɛs for between 2009 and 2011 cooling seasons

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Fig. 3

Average monthly monitored values of ɛEAHE for between 2009 and 2011 cooling seasons

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Fig. 4

Average monthly monitored values of ɛb for between 2009 and 2011 cooling seasons

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Fig. 5

Average monthly monitored values of ɛPV for between 2010 and 2011 cooling seasons

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Fig. 6

Inlet exergy rate of the EAHE system for hourly variations

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Fig. 7

Mean inlet exergy rate of the EAHE system for monthly variations for 2009–2011 cooling seasons

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Fig. 8

Illustration of the tendency of actual ɛs curve for EAHE coupled greenhouse cooling system

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Fig. 9

Exergy flow diagram (given as the percentages of air exergy input)




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