SOLAR ENERGY UTILISATION FOR PROVIDING AND MAINTAINING OPTIMAL MICROCLIMATIC CONDITIONS OF GREENHOUSE CUCUMBER. PART I: THERMAL PERFORMANCE ANALYSIS OF SOLAR WATER HEATER | ||
| Misr Journal of Agricultural Engineering | ||
| Article 20, Volume 26, Issue 3, July 2009, Pages 1377-1396 PDF (419.62 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/mjae.2009.108708 | ||
| Authors | ||
| S. M. ABDELLATIF1; M. A. EL-ADL2; A. H. Silim3 | ||
| 1Prof. and Head of Agric. Eng. Dept., Fac. of Agric., Mansoura Univ., Egypt. | ||
| 2Associate Prof., Agric. Eng. Dept., Fac. of Agric., Mansoura Univ., Egypt. | ||
| 3Demonstrator, Agric. Eng. Dept., Fac. of Agric., Mansoura Univ., Egypt. | ||
| Abstract | ||
| The main goal of the present study was to predict water temperature in the storage tank at the end of each day during winter season of 2007-2008. A complete solar heating system (solar collector and storage tank) was utilised for heating 400 litres of water. A mathematical computer model was developed to determine the thermal performance analysis of the solar heating system. Temperatures of outside air, water in the storage tank, and inlet and outlet water of the solar collector were measured and recorded on a data-logger to analysis their correlation with the water temperature prediction model in order to control solar energy heating in agricultural applications. The obtained data showed that, the daily average solar energy available was 13.372 kWh/day of which 7.138 kWh/day was stored in the storage tank of the solar energy system. The daily average overall thermal efficiencies of the solar collector and the storage system during the experimental period were 72.07% and 74.18%, respectively. They varied from day to another and during each month according to the solar energy available, the water temperature in the storage tank at the beginning of each day, and the ambient air temperature. The obtained results also revealed that, the predicted water temperatures were validated well with that measured during the experimental period by 94.68%, which gave an excellent agreement. | ||
| References | ||
|
ASHRAE (1995) Handbook of HVAC Applications, chapter 30, Atlanta, GA, USA.
ASHRAE (2005) Handbook of Fundamentals “American Society of Heating, Refrigerating and Air Conditioning Engineers” New York.
Bargach, M. N., Tadili, R.; Dahmam, A. S.; and Boukallouch, M. (2000)”Survey of thermal performances of a solar system used for heating agricultural structures in Morocco” Renewable energy, 20:133-415.
Duffie, J. A. ; and Beckman, W. A. (1991) “Solar engineering of thermal process”. John Wiley and Sons, New York.
Ismail, K.; and Goncalves, M.M. (1999) “Thermal performance of PCM storage unit” Energy conservation management, 40 (1999):115-138.
Kalogirou, S. A. (2003) “The potential of solar industrial process heat application” Appl. Energy, 76 (2003):337-361.
Kalogirou, S. A. (2004) “Solar thermal collectors and applications” Progress in Energy and Combustion Science, 30 (2004):231-295.
Konttinen, P. ; Lund, P. D. ; and Kilpi, R. J. (2003) “Mechanically manufactured selective solar absorber surfaces” Solar Energy Mater Solar Cells, 79(3):273-283.
Sayigh, A. A. W. (2001) “Renewable energy: global progress and examples’’ Renewable energy, WERN (2001):15-17.
Tripanagnostopoulos, Y. ; Souliotis, M. ; and Nousia, T. H. (2000) “Solar collectors with colored absorbers” Solar Energy, 68:343-356
Wazwaz, J. ; Salmi, H. ; and Hallak, R. (2002) “Solar thermal performance of a nickel-pigmented aluminium oxide selective absorber” Renewable Energy, 27:277-292. | ||
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