Experimental Investigation on Heat Loss from Solar Scheffler Receiver

  • Milind S Patil university of pune
  • Ajay G Chandak

Abstract

Convection heat loss occurs in receivers of high concentrating solar concentrators, Solar Scheffler, downward focusing systems and solar towers. In most applications, it can contribute a significant fraction of total energy loss, and hence it is an important determining factor in system performance. Solar concentrators are especially located in an open environment with wind flow on the receiver surface. This wind flow has the major effect on heat loss when the flow direction is parallel to the receiver plane or at an angle. All the concentrators are needed to be track during the operation and hence the position of the receiver is changing continually. In case of the Scheffler applications Scheffler’s are provided with tracking mechanism while receivers are fixed. The angle between the wind flow and the receiver axis will then play an important role in the heat loss. In this study lab experimental setup was developed to predict the heat loss from receiver with experimental simulation. To investigate convection lose from receiver, an electrically heated model receiver, was tested for different combinations of angle between the receiver and wind. Wind angle was varied from 0 deg (wind parallel to receiver surface) to 90 deg (wind perpendicular to receiver surface) with average receiver surface temperatures 100 and 110°C. It is observed that at 90 deg. Angle heat loss was maximum. Heat loss measurement was carried for three combinations of wind skirt that has an angle of 15, 30 and 45 deg. It is observed that the heat loss was minimum for 30 deg wind skirt angle. For wind angle of 67.5 and 90 deg sharp rise in heat loss was noted at higher velocities.

Keywords: Solar Energy, Solar Concentrators, Receives, Heat Loss

References

[1] Sukhatme S. P., Solar Energy, Third Edition, TATA McGraw Hill Publication, ISBN (13): 978-0-07-026064-1, 71-107, (2000) [2] Geyer, Michael, and Stine, William B., Power from the Sun www.powerfromthesun.net accessed on 7th March 2011. (2011) [3] Chandak A. G., Somani S. K., Sardeshpande V., Apparatus for heat loss characterization of solar ovens, Indian Patent application no. 1607/MUM/2010 (2010) [4] Leibfried U., Ortjohann J. Convective heat loss from upward and downward-facing cavity solar receivers: measurements and calculations. ASME Journal of Solar Energy Engineering, 117, 75-84 (1995) [5] Clausing A. M. An Analysis of Convective Heat Looses from Cavity Solar Central Receivers. Solar Energy, 27, 295-300 (1981) [6] Chan Y. L., Tien C. L., A numerical study of two dimensional, laminar natural convection in a shallow open cavity. International Journal of Heat and Mass Transfer, 28, 603-612 (1985)
[7] Harrist J. A, Lenz T G., Thermal Performance of Solar Concentrator/Cavity Receiver System. Solar Energy, 34 135-142 (1985) [8] Skok H., Ramadhyani S., Schoenhals R. J. International Journal of Heat and Fluid Flow, 12, 36-45 (1991) [9] Prakash M., Kedare S. B., Nayak J. K. Investigations on heat losses from a solar cavity receiver. Solar Energy, 83, 157-170 (2009) [10] Paitoonsurikarn S, T. Taumoefolau, K. Lovegrove. Estimation of convection loss from paraboloidal dish cavity receivers. In: Proceedings of 42nd Conference of the Australia and New Zealand Solar Energy Society (ANZSES), Perth, Australia. (2004) [11] Stine W. B., McDonald C. G. Cavity Receiver convective heat loss. Proceedings of the International Solar Energy Society (ISES) Solar World Conference, Kobe, Japan (1989) [12] Siangsukone. P. and Lovegrove K. Modeling of a steam based Paraboloidal Dish concentrator using the computer source code TRNSYS. Proceedings of Solar 2002 - Australian and New Zealand Solar Energy Society Paper 1 (2002) [13] Taumoefolau T. and Lovegrove K. An Experimental Study of Natural Convection Heat Loss from a Solar Concentrator Cavity Receiver at Varying Orientation. Proceedings of Solar 2002 - Australian and New Zealand, Solar Energy Society Paper 1 (2002) [14] Paitoonsurikarn S. , Lovegrove K., 2003. On the study of convection loss from open cavity receivers in solar paraboloidal dish applications. In: Proceedings of 41st Conference of the Australia and New Zealand Solar Energy Society (ANZSES), Melbourne, Australia (2003) [15] Paitoonsurikarn S. and Lovegrove K. A New Correlation for Predicting the Free Convection Loss from Solar Dish Concentrating Receivers. Clean Energy? – Can Do! - Proceedings of Conference of the Australia and New Zealand Solar Energy Society ANZSES (2006) [16] Kumar N. S., Reddy K.S. Numerical investigation of natural convection heat loss in modified cavity receiver for fuzzy focal solar dish concentrator, Solar Energy, 81 846-855 (2007) [17] Moghaddam S., Lawler John, McCaffery Collin, Kim Jungho. Heat Flux Based Emissivity Measurement, American Institute of Physics, Downloaded 15 April 2011 from ip address 128.8.34.39. http://proceedings.aip.org/proceedings/cpcr.jsp (2005) [18] Minitab Inc. MINITAB Statistical Software, Release 14 for Windows, State College, Pennsylvania. MINITAB is a registered trademark of Minitab Inc. (2003) [19] Chapra S. C., Canale R. P, Numerical Methods for Engineers. Tata Mc Graw Hill Publication, Third Edition, ISBN 0-07-042139-0, pp 533 - 537, (2000) [20] Holman J. P. Experimental Methods for Engineers. McGraw hill - international edition, Fifth Edition, pp 40 - 49, ISBN 0 - 07 - 100501 - 3, (1989)
Statistics
22 Views | 11 Downloads
How to Cite
Patil, M., & Chandak, A. (2018). Experimental Investigation on Heat Loss from Solar Scheffler Receiver. Asian Journal For Convergence In Technology (AJCT), 3(3). https://doi.org/10.33130/asian journals.v3i3.231
Section
Article