Determination of Effective Efficiency of Artificially Roughened Solar Air Heater Duct Using Ribs
DOI:
https://doi.org/10.13052/dgaej2156-3306.3224Keywords:
Effective efficiency, Heat Transfer, Roughness, Friction factor, Solar air heatersAbstract
Artificial surface roughness is used to increase the thermal performance of a solar air heater. The intent is to improve heat transfer between the absorber plate and air flowing through the duct. However,
roughness also increases the force required to flow air through the duct,
which leads to an increase in the pumping power required in the duct,
thus resulting in a decrease in the effective or overall efficiency of the
solar air heater duct. In this article effective efficiency of various geometries used in solar air heater are computed by the use of heat transfer and
friction factor experimental correlations. A comparison is also presented
for the selection of optimum roughness geometry.
Downloads
References
Duffie J.A. and Beckman W.A. (1991). Solar engineering thermal processes. New York: John Wiley.
Bhagoria J.L., Saini J.S. and Solanki S.C. (2002). Heat transfer coefficient and friction factor correlations for rectangular solar air heater
duct having transverse wedge shaped rib roughness on the absorber
plate. Renewable Energy 25(3): 341-69.
Hans V. S., Saini R.P. and Saini J.S. (2009). Performance of artificially
roughened solar air heaters-A review. Renewable and sustainable Energy
Reviews 13(8): 1854-69.
Varun, Saini R.P. and Singal S.K. (2007). A review on roughness geometry used in solar air heaters. Solar Energy 81: 1340–50.
Nikuradse J. (1958). Laws of flow in rough pipes. NACA: Technical
Memorandum, 1292.
Kumar A., Saini R.P. and Saini J.S. (2012). Heat and fluid flow characteristics of roughened solar air heater ducts - A review. Renewable
Energy 1-18.
Jaurker A.R., Saini J.S. and Gandhi B.K. (2006). Heat transfer coefficient and friction characteristics of rectangular solar air heater duct
using rib grooved artificial roughness. Solar energy 80(8): 895-907.
Kumar A., Bhagoria J.L. and Sarviya R.M. (2009). Heat transfer and
friction correlations for artificially roughened solar air heater duct
with discrete W-shaped ribs. Energy Conversion and management 50(8):
-17.
Saini S.K. and Saini R.P. (2008). Development of correlations for Nusselt number and friction factor for solar air heater with roughened
duct having arc-shaped wire as artificial roughness. Solar Energy 2008,
: 1118-30.
Singh S., Chander S. and Saini J.S. (2011). Heat transfer and friction
factor correlations of solar air heater ducts artificially roughened with
discrete V-down ribs. Energy 36: 5053-64.
Saha S.K. (2010). Thermal and friction characteristics of turbulent
flow through rectangular and square ducts with transverse ribs and
wire-coil inserts. Experimental Thermal and Fluid Science 34: 575–89.
Hans V.S., Saini R.P. and Saini J.S. (2010). Heat transfer and friction
factor correlations for a solar air heater duct roughened artificially
with multiple v-ribs. Solar Energy 84: 898–11.
Lanjewar A., Bhagoria J.L. and Sarviya R.M. (2011). Heat transfer and
friction in solar air heater duct with W-shaped rib Roughness on absorber plate. Energy 36: 4531-41.
Gupta D., Solanki S.C. and Saini J.S. (1997). Thermo-hydraulic performance of solar air heater with roughened absorber plates. Solar Energy
(1): 33-42
Karmare S.V. and Tikekar A.N. (2007). Heat transfer and friction factor correlation for artificially roughened duct with metal grit ribs.
International Journal of Heat and Mass Transfer 50(21-22): 4342-51.
Cortes A. and Piacentini R. (1990). Improvement of the efficiency of
the bare solar collector by means of turbulence promoters. Applied Energy 36(4): 253-56.
Wright L.M., Fu W.L. and Han J.C. (2004). Thermal performance of
angled, V-shaped and W-shaped rib turbulators in rotating rectangular cooling channels (AR = 4:1). Trans ASME 126: 604-14
