An experimental evaluation of copper, steel and polypropylene tubes in solar water heaters with thermosyphonic flow
- 124 Downloads
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.
Unable to display preview. Download preview PDF.
- 1.A Brief History of the American Solar Water Heating Industry (Solar Energy Systems Inc., 2004); http://www.ecsisolar.com/Solar Articles/briefHistory.pdf.
- 2.Solar Water Heating, in Energy Guide, 2003; http://energyguide.com/, http://library.energyguide.com/EnergyLibraryTopic,asp?bid=minnpower&prd=10&TID=13280&SubjectID=7734.
- 3.Frequently—Asked Questions about Solar Thermal Water Heating Systems, in Indian Renewable Energy Development Agency Limited (IREDA), 2004; http://www.iredaltd.com/solarthermal.htm.
- 11.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.Google Scholar
- 13.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.
- 14.Holman, J.P., Heat Transfer, 8th ed., New York: McGraw-Hill, 1997.Google Scholar