Experimental estimation of radiation heat losses from a fully open cylindrical cascaded cavity receiver by radiosity network method

Year 2024, Volume: 10 Issue: 6, 1440 - 1452, 19.11.2024

Kushal S. Wasankar Nitin P. Gulhane

Abstract

The performance of solar thermal power systems using cavity receivers and parabolic dishes highly depends on the effective absorption of concentrated solar radiation by cavity receivers. Correct measurement of convection losses is challenging due to non-isothermal surface temperatures and unpredictable flow conditions inside the cavity. Correct prediction of radiation losses can help to predict convection losses. Effect of increasing the area ratio of normal cavity using cylinder in cylinder arrangement to increase the surface area for heat transfer, is studied experimentally. The specially designed heaters for model cavity size using nichrome wires sheathed between ceramic sheets were used to apply the thermal load, and the heat transfer rate was observed. Experimental temperatures were used for calculating the radiation heat losses using radiosity network method. Modified cavity surface is divided in parts and radiosity values for each part is calculated by solving simultaneous equation obtained by network method, using Gauss-Seidel method. Finally, the radiation heat loss from each surface is added to get total radiation heat loss. More heat transfer area for cylinder in cylinder arrangement and with the same heat input modified cavity shows higher surface temperatures. Network representation provides a better understanding of radiative interaction between different parts of the cavity. Radiosity network method predicts more accurate results than mean radiation heat loss calculations by calculating actual radiosity values for different parts of cavity. The difference in prediction is high at lower temperatures, emissivity and reduces with increasing temperature and emissivity. Effect of inner cylinder surface temperature was studied with three different cases and found that the radiation heat losses are less affected by inner cylinder surface temperatures. Effect of aspect ratio on radiation heat losses is presented in this work. Experimental results show that proposed cavity receiver design provide double surface area for heat transfer with increased surface temperatures for same heat input and total heat loss.

Keywords

Cavity Inclination, Cavity Receiver, Heat Losses, Parabolic Dish, Radiosity Network, Solar Concentrators

References

• [1] Ameri M, Farhangian Marandi O, Adelshahian B. The effect of aperture size on the cavity performance of solar thermoelectric generator. J Renew Energy Environ 2017;4:39–46.
• [2] Abbasi-Shavazi E, Hughes GO, Pye JD. Investigation of heat loss from solar cavity receiver. Energy Proc 2015;69:269–278. [CrossRef]
• [3] Paitoonsurikarn S, Lovegrove K. Numerical investigation of natural convection loss in cavity-type solar receivers. Solar - Proceedings of 40th Australian and New Zealand Solar Energy Society ANZSES Conference, 2002, Australia. pp.1–6.
• [4] Paitoonsurikarn S, Lovegrove K. On the study of convection loss from open cavity receivers in solar paraboloidal dish applications. Renewables – Proceedings of 41st Australia and New Zealand Solar Energy Society ANZSES Conference, 26-29 Nov 2003, Melbourne, Australia. pp.154–161.
• [5] Alvarado-Juárez R, Montiel-González M, Villafán-Vidales HI, Estrada CA, Flores-Navarrete J. Experimental and numerical study of conjugate heat transfer in an open square-cavity solar receiver. Int J Therm Sci 2020;156:106458. [CrossRef]
• [6] Maurya A, Kumar A, Sharma D. A comprehensive review on performance assessment of solar cavity receiver with parabolic dish collector. Energ Source Part A 2022;44:4808–4845. [CrossRef]
• [7] Wu SY, Guan JY, Xiao L, Shen ZG, Xu LH. Experimental investigation on the heat loss of a fully open cylindrical cavity with different boundary conditions. Exp Therm Fluid Sci 2013;45:92–101. [CrossRef]
• [8] Loni R, Asli-Areh EA, Ghobadian B, Kasaeian AB, Gorjian S, Najafi G, et al. Research and review study of solar dish concentrators with different nanofluids and different shapes of cavity receiver: Experimental tests. Renew Energy 2020;145:783–804. [CrossRef]
• [9] Eterafi S, Gorjian S, Amidpour M. Effect of covering aperture of conical cavity receiver on thermal performance of parabolic dish collector: experimental and numerical investigations. J Renew Energy Environ 2021;8:29–41.
• [10] Gonzalez MM, Hinojosa JP, Estrada CA. Numerical study of heat transfer by natural convection and surface thermal radiation in an open cavity receiver. Sol Energy 2012;86:1118–1128. [CrossRef]
• [11] Juarezb JO, Hinojosa JF, Xaman JP, Tello MP. Numerical study of natural convection in an open cavity considering temperature-dependent fluid properties. Int J Therm Sci 2011;50;2184–2197. [CrossRef]
• [12] Venkatachalam T, Cheralathan M. Effect of aspect ratio on the thermal performance of cavity receiver for solar parabolic dish concentrator: An experimental study. Renew Energy, 2019;139:573–581. [CrossRef]
• [13] Yuan Y, Xiaojie L, Ziming C, Fuqiang W, Yong S, Heping T. Experimental investigation of thermal performance enhancement of cavity receiver with bottom surface interior convex. Appl Therm Engineer 2020;168:114847. [CrossRef]
• [14] Bellos E, Bousi E, Tzivanidis C, Pavlovic S. Optical and thermal analysis of different cavity receiver designs for solar dish concentrators. Energy Conver Manage 2019;100013:1–19. [CrossRef]
• [15] Reddy KS, Kumar NS. Convection and surface radiation heat losses from modified cavity receiver of solar parabolic dish collector with two-stage concentration. Heat Mass Transf 2009;45:363–373. [CrossRef]
• [16] Reddy KS, Kumar NS. Combined laminar natural convection and surface radiation heat transfer in a modified cavity receiver of the solar parabolic dish. Int J Therm Sci 2008;47:1647–1657. [CrossRef]
• [17] Ibrahim UK, Salleh RM. Application of network representation model for radiation analysis. Int J Chem Engineer Appl 2012;3:195–200. [CrossRef]
• [18] Holman JP. Heat Transfer. 8th ed. New York: McGraw-Hill; 1997.
• [19] Taumoefolau T, Paitoonsurikarn S, Hughes G, Lovegrove K. Experimental investigation of natural convection heat loss from a model solar concentrator cavity receiver. J Sol Energy Engineer 2004;126:801–807. [CrossRef]
• [20] Maag G, Falter C, Steinfeld A. The temperature of a quartz/sapphire window in a solar cavity receiver. J Sol Energy Engineer 2011;133:014501. [CrossRef]
• [21] Neber M, Lee H. Design of a high-temperature cavity receiver for residential-scale concentrated solar power. Energy 2012;47:481–487. [CrossRef]
• [22] Zou C, Zhang Y, Falcoz Q, Neveu P, Zhang C, Shu W, et al. Design and optimization of a high-temperature cavity receiver for a solar energy cascade utilization system. Renew Energy 2017;103:478–489. [CrossRef]
• [23] Bader R, Barbato M, Pedretti A, Steinfeld A. An air-based corrugated cavity-receiver for solar parabolic trough concentrators. Appl Energy 2010;138:337–345. [CrossRef]
• [24] Hathaway BJ, Lipiński W, Davidson JH. Heat transfer in a solar cavity receiver: Design considerations. Numer Heat Tr A-Appl 2012;62:445–461. [CrossRef]
• [25] Pye J, Hughes G, Abbasi E, Asselineau CA, Burgess G, Coventry J, et al. Development of a higher-efficiency tubular cavity receiver for direct steam generation on a dish concentrator. AIP Conf Proc 2016;1734:030029. [CrossRef]
• [26] Gil R, Monné C, Bernal N, Muñoz M, Moreno F. Thermal model of a dish Stirling cavity-receiver. Energies 2015;8:1042–1057. [CrossRef]
• [27] Abbasi-Shavazi E, Torres JF, Hughes G, Pye J. Experimental correlation of natural convection losses from a scale-model solar cavity receiver with non-isothermal surface temperature distribution. Sol Energy 2020;198:355–375. [CrossRef]
• [28] Wang Y, Lipiński W, Pye J. A method for in situ measurement of directional and spatial radiosity distributions from complex-shaped solar thermal receivers. Sol Energy 2020;201:732–745. [CrossRef]
• [29] Sinha R, Gulhane NP. Numerical study of radiation heat loss from solar cavity receiver of parabolic dish collector. Numer Heat Tr A-Appl 2020;77:743–759. [CrossRef]
• [30] Wasankar KS, Yadav SC, Sinha R, Gulhane NP. Numerical investigation of heat losses through cascaded fully open cavity receiver at high temperatures (up to 5000C). E3S Web Conf 2019;128:01018. [CrossRef]