Abstract
In this paper we report experimental results for the performance and rate of heat transfer in copper tubes in solar water heaters with thermosyphonic flow in continuation of experimental data reported in previous publications (Solar Energy, 2003, vol. 74, pp. 441–445, and Energy Sources, 1997, vol. 19, pp. 147–152). We also show a comparison between performances of three kinds of tubes: copper, polypropylene and steel under similar conditions. An analytical relation for calculation of rate of heat transfer in copper tubes is also presented in terms of Nusselt versus Reynolds and Prantdl numbers. A comparison of experimental data showed that performance of copper tubes is slightly better than polypropylene tubes while both of these tubes are significantly better than steel tubes.
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References
A Brief History of the American Solar Water Heating Industry (Solar Energy Systems Inc., 2004); http://www.ecsisolar.com/Solar Articles/briefHistory.pdf.
Solar Water Heating, in Energy Guide, 2003; http://energyguide.com/, http://library.energyguide.com/EnergyLibraryTopic,asp?bid=minnpower&prd=10&TID=13280&SubjectID=7734.
Frequently—Asked Questions about Solar Thermal Water Heating Systems, in Indian Renewable Energy Development Agency Limited (IREDA), 2004; http://www.iredaltd.com/solarthermal.htm.
Chinnappa, J.C.V. and Gnanalingam, K., Performance at Colombo, Cylon, of a Pressurized Solar Water Heater of the Combined Collector and Storage Type, Solar Energy, 1973, vol. 15, pp. 195–204.
Shitzer, A., Kalmanoviz, D., Zviring, Y., and Grossman, G., Experiments with a Flat Plate Solar Water Heating System, Solar Energy, 1979, vol. 22, pp. 27–35.
Close, D.J., The Performance of Solar Water Heaters with Natural Circulation, Solar Energy, 1962, vol. 6, pp. 33–40.
Ong, K.S., An Improved Computer Program for the Thermal Performance of a Solar Water Heater, Solar Energy, 1976, vol. 18, pp. 183–191.
Chang, J.M., Leu, J.S., Shen, M.C., and Huang, B.J., A Proposed Modified Efficiency for Thermosyphonic Solar Heating Systems, Solar Energy, 2004, vol. 76, pp. 693–701.
Riazi, M.R., Solar Water Heating Systems with Thermosiphonic Flow, in Solar Energy: New Research, Hough, T.P., Ed., New York, Hauppauge: Nova Sci. Publishers Inc., 2006, ch. 8, pp. 255–275; Hardcopy, ISBN: 1-59454-630-4/Novascience@earthlink.net Web: www.novapubli-shers.com.
Razavi, J. and Riazi, M.R., Experiments with Polypropylene Finned-Tube Solar Water Heating System in Thermosyphonic Flow, Energy Sources, 1994, vol. 16, no. 1, pp. 129–133.
Riazi, M.R. and Razavi, J., Performance of Polypropylene and Steel Tubes in Solar Water Heaters with Natural Circulation, Energy Sources, 1997, vol. 19, no. 2, pp. 147–152.
Razavi, J., Riazi, M.R., and Mahmoodi, M., Rate of Heat Transfer in Polypropylene Finned Tube Solar Water Heating System, Solar Energy, 2003, vol. 74, no. 6, pp. 441–445.
In Search of an All Plastic Solar Hot Water System for Domestic Hot Water (Solar Cities), 2007; http://solarcities.blogspot.com/2007/12/in-search-of-all-plasticsolar-hot.html.
Holman, J.P., Heat Transfer, 8th ed., New York: McGraw-Hill, 1997.
Rowley, R.L., Wilding, W.V., Oscarson, J.L., et al., DIPPR Data Compilation of Pure Compound Properties, in Design Institute for Physical Properties (DIPPR), New York, NY: Taylor and Francis Publishing Co., 2002; http://dippr.byu.edu/.
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Riazi, M.R., Razavi, J., Sadeghi, A. et al. An experimental evaluation of copper, steel and polypropylene tubes in solar water heaters with thermosyphonic flow. Appl. Sol. Energy 45, 65–69 (2009). https://doi.org/10.3103/S0003701X09010174
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DOI: https://doi.org/10.3103/S0003701X09010174