Experimental study of natural convection heat transfer from a nonuniformly heated flat plate simulating PV panel

다국어 초록 (Multilingual Abstract)

In view of the characteristic of Photovoltaic (PV) conversion, an experimental study has been conducted to investigate the natural convection heat transfer from a flat plate. In order to simulate the real PV cells, three electrical heating circuits were employed to achieve a linear nonuniform heat flux boundary condition. The major parameters, such as the gradient parameter of heat flux k, tilt angle θ and heat flux q w were introduced to analyze their influence on heat transfer ability. Both the local temperature distribution and the overall trend of Nusselt number have been presented. Comparing with the uniform thermal boundary condition, the results show that the local convection heat transfer coefficient is fluctuated at the positions where heat flux has changed. When gradient parameter of heat flux increases, the difference of local convection heat transfer coefficient at the top of the plate between tilt angle θ = 0° and 90° becomes smaller. Moreover, it is observed that the gradient parameter of heat flux has a promotion effect on average convection Nusselt number at larger tilt angle, but the effect becomes complex as tilt angle is smaller. Finally, a correlation combining all significant factors has been put forward to estimate the natural convection heat transfer.

참고문헌 (Reference)

1 J. K. Tonui, "ir-cooled PV/T solar collectors with low cost performance improvements" 81 (81): 498-511, 2007

2 ASME, "Test uncertainty, ASNI/ASME PTC 19.1-2005"

3 A. Pantokratoras, "Steady laminar assisted mixed convection normally to a heated horizontal plate with finite length" 65 : 158-169, 2013

4 S. C. Saha, "Scaling for the Prandtl number of the natural convection boundary layer of an inclined flat plate under uniform surface heat flux" 55 (55): 2394-2401, 2012

5 X. X. Zhang, "Review of R&D progress and practical application of the solar Photovoltaic/Thermal (PV/T) technologies" 16 (16): 599-617, 2012

6 M. A. Hasan, "Photovoltaic thermal module concepts and their performance analysis: A review" 14 (14): 1845-1859, 2010

7 J. J. Wei, "Numerical study of simultaneous natural convection heated thin plate with arbitrary inclination" 38 (38): 309-317, 2002

8 A. Kalendar, "Numerical and experimental studies of natural convective heat transfer from vertical and inclined narrow isothermal flat plates" 47 (47): 1181-1195, 2011

9 O. A. Tkachenko, "Numerical and experimental investigation of unsteady natural convection in a non-uniformly heated vertical open-ended channel" 99 : 9-25, 2016

10 T. S. Chen, "Natural convection on horizontal, inclined and vertical plates with variable surface temperature or heat flux" 29 (29): 1465-1478, 1986

11 T. Fujii, "Natural convection heat transfer from a plate with arbitrary inclination" 15 (15): 755-767, 1972

12 K. E. Hassan, "Natural convection from isothermal flat surfaces" 13 (13): 1873-1886, 1970

13 M. Corcione, "Natural convection from inclined plates to gases and liquids when both sides are uniformly heated at the same temperature" 50 (50): 1405-1416, 2011

14 Mehdi Moslehi, "MHD mixed convection slip flow in a vertical parallel plate microchannel heated at asymmetric and uniform heat flux" 대한기계학회 29 (29): 5317-5324, 2015

15 A. Alzwayi, "Large eddy simulation of transition of free convection flow over an inclined upward facing heated plate" 57 : 330-340, 2014

16 J. A. King, "Laminar natural convection heat transfer from inclined surfaces" 34 (34): 1901-1904, 1991

17 J. Peng, "Investigation on the annual thermal performance of a photovoltaic wall mounted on a multi-layer facade" 122 : 646-656, 2013

18 S. A. E. S. Ahmed, "Heat transfer characteristics of staggered wing-shaped tubes bundle at different angles of attack" 50 (50): 1091-1102, 2014

19 V. S. Burak, "Free-convective heat transfer on a vertical surface with heat-flux discontinuity" 38 (38): 155-161, 1995

20 W. W. Yousef, "Free convection heat transfer from upward facing isothermal horizontal surfaces" 104 (104): 493-500, 1982

21 H. W. Coleman, "Experimentation, validation and uncertainty analysis for engineers, Third ed." John Wiley & Sons 1-130, 2009

22 S. Y. Wu, "Experimental investigation on heat loss of a fully open cylindrical cavity with different boundary conditions" 45 : 92-101, 2013

23 M. Y. A. Jamalabadi, "Experimental investigation of thermal loading of a horizontal thin plate using infrared camera" 26 (26): 159-167, 2014

24 S. E. S. Ahmed, "Effect of attack and cone angels on air flow characteristics for staggered wing shaped tubes bundle" 51 (51): 1001-1016, 2015

25 P. Midya, "Dynamic maximum power point tracker for photovoltaic applications" 1996

26 M. Z. Abedin, "Direct numerical simulation for a time-developing natural-convection boundary layer along a vertical flat plate" 52 (52): 4525-4534, 2009

27 C. Menezo, "An experimental investigation of free cooling by natural convection of vertical surfaces for Building integrated photovoltaic (BIVP) applications" 2007

28 W. T. Kierkus, "An analysis of laminar free convection flow and heat transfer about an inclined isothermal plate" 11 (11): 241-253, 1968

29 S. Armstrong, "A thermal model for photovoltaic panels under varying atmospheric conditions" 30 (30): 1488-1495, 2010

30 S. Samanta, "A similarity theory for natural convection from a horizontal plate for prescribed heat flux or wall temperature" 55 (55): 3857-3868, 2012