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TECHNICAL PAPERS

Experimental Study of a Earth-to-Air Heat Exchanger Coupled to a Photovoltaic System

[+] Author and Article Information
Athanassios A. Argiriou

Physics Deparment, University of Patras, GR-26500 Patras, Greece e-mail: argiriou@physics.upatras.gr

Spyridon P. Lykoudis

Institute for Environmental Research & Sustainable Development, National Observatory of Athens, I. Metaxa & V. Pavlou, GR-152 36, Palaia Pendeli, Greecee-mail: slykoud@astro.noa.gr

Constantinos A. Balaras

Institute for Environmental Research & Sustainable Development, National Observatory of Athens, I. Metaxa & V. Pavlou, GR-152 36, Palaia Pendeli, Greecee-mail: costas@env.meteo.noa.gr

Demosthenes N. Asimakopoulos

Physics Department, National & Kapodistrian University of Athens, Physics Building V, Panepistimioupolis, GR-157 84 Zografos, Greecee-mail: dasimak@cc.uoa.gr

J. Sol. Energy Eng 126(1), 620-625 (Feb 12, 2004) (6 pages) doi:10.1115/1.1634584 History: Received July 01, 2001; Revised March 01, 2003; Online February 12, 2004
Copyright © 2004 by ASME
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References

Chen, B., Wang, T., Maloney J., and Newman, M., 1983, “Measured and Predicted Cooling Performance of Earth Contact Cooling Tubes,” Proceedings, ASES Annual Meeting, Minneapolis, MN, pp. 123–132.
Schiller, G., 1992, “Earth Tubes for Passive Cooling, the Development of a Transient Numerical Model for Predicting the Performance of Earth/air Heat Exchangers,” M.Sc. thesis, Massachusetts Institute of Technology, Boston, MA.
Tzaferis,  A., Liparakis,  D., Santamouris,  M., and Argiriou,  A., 1992, “Analysis of the Accuracy and Sensitivity of Eight Models to Predict the Performance of Earth to Air Heat Exchangers,” Energy Build., 18, pp. 35–43.
Levit,  H. J., Gaspar,  R., and Piacentini,  R. D., 1989, “Simulation of Greenhouse Microclimate by Earth-tube Heat Exchangers,” Agric. Forest Meteorol., 47, pp. 31–47.
Agas,  G., Matsaggos,  T., Santamouris,  M., and Argiriou,  A., 1991, “On the Use of Atmospheric Heat Sinks for Heat Dissipation,” Agric. Forest Meteorol. Energy Build., 17, pp. 321–329.
Santamouris,  M., Mihalakakou,  G., Argiriou,  A., and Asimakopoulos,  D. N., 1995, “On the Performance of Buildings Coupled with Earth-to-air Heat Exchangers,” Sol. Energy, 54, pp. 375–380.
Santamouris,  M., Mihalakakou,  G., Balaras,  C. A., Argiriou,  A., Asimakopoulos,  D. N., and Vallindras,  M., 1995, “Use of Buried Pipes for Energy Conservation in Cooling of Agricultural Greenhouses,” Sol. Energy, 55, pp. 111–124.
Argiriou, A., 1996, “Ground Cooling,” Passive Cooling in Buildings, M. Santamouris and D. N. Asimakopoulos, eds., James & James, London, pp. 360–393.
Pitts, D. R., and Sissom, L. E., 1977, Theory and Problems of Heat Transfer, McGraw-Hill, New York.
ASHRAE, 2001, Fundamentals Handbook.
Michel, E., (Editor), 1999, Design, Realization, Test, Comparative Analysis of Low Electric Consumption PV Cooling Systems, Final report Project JOU3CT 960100, European Commission, Brussels.
Duffie, J. A., and Beckman, W. A., 1991, Solar Engineering of Thermal Processes, Wiley Interscience, New York.

Figures

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Cross section and top view of the earth-to-air heat exchanger.
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Locations of temperature measurement points (drawing not in scale).
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Photovoltaic panel efficiency versus panel temperature.
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Average diurnal variation of photovoltaic efficiency (bullets) and panel temperature (crosses). Final data set.
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Cumulative frequency distribution of the airflow velocity.
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Average diurnal variation of airflow velocity (bullets) and global solar irradiance (crosses). Final data set.
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Cumulative frequency distribution for the monthly COP.
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Monthly variation of the COP (bullets) and the temperature difference (Tin–Tgavg) (crosses).
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Variation of the COP calculated from the 10-minute average data with the measured temperature difference Tin–Tgavg.
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Cumulative distribution of the air temperature difference at the inlet and the outlet of the exchanger.
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Air temperature gradient along the heat exchanger at different airflow velocities.
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Monthly system performance.
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Variation of the 10-minute average data of the ground temperature at the exchanger depth and the 24h moving average of the air temperature drop across the exchanger.
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Variation of the 10-minute average data of the inlet temperature at the exchanger and the respective air temperature drop across the exchanger. Data plotted for 3 consecutive characteristic days.

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