Numerical modelling and optimisation of natural convection heat loss suppression in a solar cavity receiver with plate fins

This study details the numerical modelling and optimization of natural convection heat suppression in a solar cavity receiver with plate fins. The use of plate fins attached to the inner aperture surface is presented as a possible low cost means of suppressing natural convection heat loss in a cavity receiver. In the first part of the study a three-dimensional numerical model that captures the heat transfer and flow processes in the cavity receiver is analyzed, and the possibilities of optimization were then established. The model is laminar in the range of Rayleigh number, inclination angle, plate height and thickness considered. In the second part of the study, the geometric parameters considered were optimized using optimization programme with search algorithm. The results indicate that significant reduction on the natural convection heat loss can be achieved from cavity receivers by using plate fins, and an optimal plate fins configuration exit for minimal natural convection heat loss for a given range of Rayleigh number. Reduction of up to a maximum of 20% at 0° receiver inclination was observed. The results obtained provide a novel approach for improving design of cavity receiver for optimal performance.

[1]  Ricardo Scozia,et al.  NATURAL CONVECTION IN SLENDER CAVITIES WITH MULTIPLE FINS ATTACHED TO AN ACTIVE WALL , 1991 .

[2]  M. Hasnaoui,et al.  Natural convection in rectangular enclosures with adiabatic fins attached on the heated wall , 1992 .

[3]  Viviana Cocco Mariani,et al.  Natural convection in a partially open square cavity with internal heat source: An analysis of the opening mass flow , 2011 .

[4]  Mahroo Eftekhari,et al.  Natural Convection Heat Transfer in a Partially Open Square Cavity With a Thin Fin Attached to the Hot Wall , 2008 .

[5]  K. S. Reddy,et al.  NUMERICAL STUDY OF NATURAL CONVECTION HEAT LOSS IN MODIFIED CAVITY RECEIVER FOR FUZZY FOCAL SOLAR DISH CONCENTRATOR , 2006 .

[6]  E. Bilgen,et al.  Natural convection in enclosures with partial partitions , 2002 .

[7]  Baldev Raj,et al.  Interaction of natural convection flow in multiple open cavities formed due to horizontal fins , 2011 .

[8]  Josua P. Meyer,et al.  Thermodynamic optimisation of the integrated design of a small‐scale solar thermal Brayton cycle , 2012 .

[9]  S. Shakerin,et al.  NATURAL CONVECTION IN AN ENCLOSURE WITH DISCRETE ROUGHNESS ELEMENTS ON A VERTICAL HEATED WALL , 1986 .

[10]  Xundan Shi,et al.  Laminar Fluid Flow and Heat Transfer in a Lid-Driven Cavity Due to a Thin Fin , 2002 .

[11]  J. Sunderland,et al.  Equations of properties as a function of temperature for seven fluids , 1987 .

[12]  Xundan Shi,et al.  Laminar Natural Convection Heat Transfer in a Differentially Heated Square Cavity Due to a Thin Fin on the Hot Wall , 2003 .

[13]  Tomoaki Kunugi,et al.  Natural convection in a hemispherical enclosure heated from below , 1994 .

[14]  Antonio C. M. Sousa,et al.  Control of laminar natural convection in differentially heated square enclosures using solid inserts at the corners , 2003 .

[15]  A. M. Clausing,et al.  Convective losses from cavity solar receivers--Comparisons between analytical predictions and experimental results , 1983 .

[16]  S. A. Nada,et al.  Natural convection heat transfer in horizontal and vertical closed narrow enclosures with heated rectangular finned base plate , 2007 .

[17]  M. Behnia,et al.  An Experimental and Computational Study of the Heat Loss Characteristics of a Trapezoidal Cavity Absorber , 2004 .

[18]  Abraham Kribus,et al.  A Multistage Solar Receiver , 1999 .

[19]  D. P. Sekulic,et al.  Extended surface heat transfer , 1972 .

[20]  Abraham Kribus,et al.  Experimental evaluation of a non-isothermal high temperature solar particle receiver , 2004 .

[21]  Sendhil Kumar Natarajan,et al.  Combined laminar natural convection and surface radiation heat transfer in a modified cavity receiver of solar parabolic dish , 2008 .

[22]  Asaf Varol,et al.  Effects of thin fin on natural convection in porous triangular enclosures , 2007 .

[23]  Ramón L. Frederick,et al.  Natural convection in an inclined square enclosure with a partition attached to its cold wall , 1989 .

[24]  Lan Xiao,et al.  Effect of aperture position and size on natural convection heat loss of a solar heat-pipe receiver , 2011 .

[25]  Terry G. Lenz,et al.  Thermal performance of solar concentrator/cavity receiver systems , 1985 .

[26]  Timothy Nicholas Anderson,et al.  Suppression of natural convection heat transfer coefficients in an attic shaped enclosure , 2010 .

[27]  Sendhil Kumar Natarajan,et al.  Comparison of receivers for solar dish collector system , 2008 .

[28]  E. K. Lakhal,et al.  Natural convection in inclined rectangular enclosures with perfectly conducting fins attached on the heated wall , 1997 .

[29]  K. S. Reddy,et al.  Convection and surface radiation heat losses from modified cavity receiver of solar parabolic dish collector with two-stage concentration , 2009 .

[30]  Ya-Ling He,et al.  Study on combined heat loss of a dish receiver with quartz glass cover , 2013 .

[31]  DA SILVA , 2013 .

[32]  Shireesh B. Kedare,et al.  Investigations on heat losses from a solar cavity receiver , 2009 .

[33]  Sendhil Kumar Natarajan,et al.  An improved model for natural convection heat loss from modified cavity receiver of solar dish concentrator , 2009 .

[34]  E. Bilgen,et al.  Natural convection in cavities with a thin fin on the hot wall , 2005 .

[35]  Abraham Kribus,et al.  The “Porcupine”: A Novel High-Flux Absorber for Volumetric Solar Receivers , 1998 .

[36]  Ramón L. Frederick,et al.  Heat transfer in a square cavity with a conducting partition on its hot wall , 1989 .

[37]  V.M.K. Sastri,et al.  Natural convection in a differentially heated square cavity with a horizontal partition plate on the hot wall , 1993 .

[38]  P ? ? ? ? ? ? ? % ? ? ? ? , 1991 .

[39]  T. Taumoefolau,et al.  An Experimental Study of Natural Convection Heat Loss from a Solar Concentrator Cavity Receiver at Varying Orientation , 2002 .

[40]  Ali J. Chamkha,et al.  Conjugate natural convection in a square enclosure with inclined thin fin of arbitrary length , 2007 .

[41]  George N. Facas Natural convection in a cavity with fins attached to both vertical walls , 1993 .

[42]  Rami Ben-Zvi,et al.  Simulation of a Volumetric Solar Reformer , 2007 .

[43]  Sendhil Kumar Natarajan,et al.  Numerical investigation of natural convection heat loss in modified cavity receiver for fuzzy focal solar dish concentrator , 2007 .