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Keywords: natural convection
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Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. April 2020, 142(2): 021008.
Paper No: SOL-19-1240
Published Online: October 31, 2019
... and spacing between the fins, while the heat transfer and fluid flow are directed by natural convection. An inclined rectangular channel similar to the dimensions of a typical solar air heater has been considered. Three different fin configurations, namely, continuous long fins for the whole length...
Journal Articles
Article Type: Research-Article
J. Sol. Energy Eng. August 2014, 136(3): 031011.
Paper No: SOL-12-1283
Published Online: March 6, 2014
... ]. solar thermal energy supercritical fluid natural convection experiment carbon dioxide DME The current study proposed an experimental investigation into the basic characteristics of solar thermal conversion using supercritical CO 2 –dimethyl ether (DME) natural convection. The main goals...
Journal Articles
Article Type: Research-Article
J. Sol. Energy Eng. August 2014, 136(3): 031001.
Paper No: SOL-12-1254
Published Online: January 10, 2014
... with the increase in the fin number and fin height. Also, results show that increasing exit diameter is a favorable factor from the first-law efficiency viewpoint, while it has an unfavorable effect on the second-law efficiency. photovoltaic/thermal (PV/T) collector natural convection first law efficiency...
Journal Articles
Article Type: Research-Article
J. Sol. Energy Eng. February 2014, 136(1): 011017.
Paper No: SOL-12-1182
Published Online: November 26, 2013
... discharge rates are obtained for a range of Rayleigh numbers, 10 5  ≤ Ra D  ≤ 10 7 in order to determine optimal shroud and baffle configurations. It was found that a baffle width of 75% of the width of the heat exchanger provided the best heat transfer performance. natural convection thermal...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2012, 134(1): 011014.
Published Online: November 29, 2011
... efficiencies are 37.5% and 9.39%, respectively. Shahsavar and Ameri [( 23 )] developed a simulation model for a direct-coupled PV/T air collector. Their studied system was tested in natural convection and forced convection (with two, four, and eight fans operating) and its unsteady results were presented...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2012, 134(1): 011010.
Published Online: November 29, 2011
... . 24 01 2011 26 08 2011 29 11 2011 29 11 2011 heat exchangers natural convection numerical analysis solar power tanks (containers) thermal energy storage transient analysis water storage thermal stores immersed heat exchanger negatively buoyant flow baffle...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. May 2011, 133(2): 021004.
Published Online: March 22, 2011
...S. Paitoonsurikarn; K. Lovegrove; G. Hughes; J. Pye In open cavity receivers employed in solar paraboloidal dish applications, natural convection occurs and contributes a significant fraction of energy loss. Its characteristics hence need to be clarified so that it can be effectively minimized...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2010, 132(1): 011010.
Published Online: January 4, 2010
..., especially in the state close to the critical point. Thus, natural convective flow of the supercritical carbon dioxide can be easily induced by solar heating or water cooling. Such convective flow absorbs and transports heat to water in solar collector tubes. Motivated by the above idea, an experimental...
Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. May 2009, 131(2): 024502.
Published Online: March 25, 2009
...Cynthia A. Cruickshank; Stephen J. Harrison This paper presents a simplified test method that was developed to allow preconfigured solar domestic hot water systems that use natural convection/thermosyphon heat exchangers to be characterized. The results of this test method produce performance...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2007, 129(4): 449–457.
Published Online: May 2, 2007
...Yan Su; Jane H. Davidson The transient natural convective thermal/fluid processes during discharge of an inclined rectangular solar storage tank via an immersed heat exchanger are modeled and compared to prior experimental data. The model treats the heat exchanger as a porous medium within...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. May 2007, 129(2): 210–214.
Published Online: December 8, 2005
...Yan Su; Jane H. Davidson A scale analysis of the transient discharge of a fully mixed thermal storage vessel with an immersed single-tube heat exchanger is extended to provide a generalized expression for the transient natural convection Nusselt number for heat exchangers comprising many tubes...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. May 2006, 128(2): 178–188.
Published Online: September 6, 2005
... process takes place and the units accumulate heat. Accordingly, the air is cooled by natural convection and flows downward the units and the internal surface of the adjacent wall. Between 8:00 p.m. and 10:00 a.m. the heat storage units reject the accumulated heat and solidification occurs. Accordingly...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2006, 128(1): 83–89.
Published Online: April 2, 2005
... interface height. 21 07 2004 02 04 2005 ventilation natural convection heat radiation aerodynamics stratified flow Based on the thermal stratification in the EFB model, this paper establishes a new model, the so-called TFNV model. This model considers the impacts of heat...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2005, 127(3): 324–332.
Published Online: March 4, 2005
... 04 03 2005 heat exchangers thermal energy storage solar absorber-convertors natural convection polymers Integral Collector Storage Solar Natural Convection Heat Exchanger Recent efforts in the US to replace glass and metal with polymeric materials in solar water heating...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. February 2005, 127(1): 21–28.
Published Online: February 7, 2005
...W. Liu; J. H. Davidson, Fellow of ASME; F. A. Kulacki, Fellow of ASME Natural convection is measured in an enclosure that represents an integral collector storage system (ICS) with an immersed tube-bundle heat exchanger. Heat transfer coefficients for bundles of 240 tubes contained in a thin...
Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. August 2005, 127(3): 421–424.
Published Online: November 1, 2004
... cooling natural convection The present analysis indicates that natural convection venting can lower the dry stagnation temperature of a nonselective polymer absorber plate in flat-plate, single-glazed collectors operated in a hot, sunny environment ( 1100 W ∕ m 2 , 43 ° C...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. May 2004, 126(2): 801–807.
Published Online: May 4, 2004
...T. Taumoefolau; S. Paitoonsurikarn; G. Hughes; K. Lovegrove Natural convection heat loss inevitably occurs in cavity-type receivers in high concentrating solar dishes, downward focusing systems and solar towers. In most applications, it can contribute a significant fraction of total energy loss...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. May 2004, 126(2): 702–709.
Published Online: May 4, 2004
...W. Liu; J. H. Davidson, Fellow of ASME,; F. A. Kulacki, Fellow of ASME, Natural convection heat transfer coefficients for a rectangular array of eight tubes contained in a thin enclosure of aspect ratio 9.3:1 and inclined at 30 deg to the horizontal are measured for a range of transient operating...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. May 2003, 125(2): 190–194.
Published Online: May 8, 2003
...Pai-Chuan Liu The knowledge of steady-state temperature distribution is known a priori for natural convection stability analysis. The present study determines the temperature profiles in an infinite horizontal layer of fluid filled with saturated porous medium confined between two convective...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. February 2003, 125(1): 67–75.
Published Online: January 27, 2003
... collector storage. Experiments are conducted for isothermal and stratified enclosures with both adiabatic and uniform heat flux boundary conditions. Natural convection flow in the enclosure is interpreted from measured water temperature distributions. Formation of an appropriate temperature difference...