Performance Analysis of Integrated Collector System with Immersed Coil Heat Exchanger

Abstract:

The performance of integrated solar collector / thermal energy storage with immersed heat exchanger was investigated experimentally at the Solar Research Site, University Technology PETRONAS, (4.4224^oN, 100.9904^oE), Malaysia. The experimental set up consisted of 150 liters storage tank capacity with immersed coil heat exchanger, single glazing 1.5m² flat plate collector with 15^o tilt to the horizontal. The circulation of the working fluid was by forced in closed loop with a mini solar pump. Aluminum cell foam was attached to the absorber as extended surface. The surface of the collector was coated with black ornament to improve its absorption. The system was tested under clear skys, for two cases; with and without water drawn-off for seven days per case studied. The performance evaluation data obtained for case1 at the mean maximum solar intensity was 503.98 W/m² were: maximum daily water temperature 63°C, average daily water temperature 46°C, collector efficiency 63% and system efficiency 43%. Whilst for case 2, the mean maximum solar intensity was 473.11 W/m², the maximum daily water temperature 54°C, average daily water temperature 39.36°C, collector efficiency 54% and system efficiency 39%. The system efficiency for case 2 showed that the heat exchanger performed slighlty better and the water drawn-off effect is minimal.

• Periodical: Applied Mechanics and Materials (Volume 660)
• Pages: 740-744
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.660.740
• Online since: October 2014
• Authors: Lukmon Owolabi Afolabi*, Hussain Hamoud Al-Kayiem, Tesfamichael Baheta Aklilu
• Keywords: Coil Heat Exchanger, Solar Collector, Solar Energy, Thermal Energy Storage

References

[1] A. Sharma, V.V. Tyagi, C.R. Chen, D. Buddhi. Review on thermal energy storage with phase change materials and applications,. Renew Sustainable. Energy. Rev. 2009; 13: 318–345.

DOI: 10.1016/j.rser.2007.10.005

[2] M. Slaman, R. Griessen. Solar collector overheating protection. Sol. Energy 2009; 83: 982–987.

DOI: 10.1016/j.solener.2009.01.001

[3] K.R. Kumar, K.S. Reddy. Thermal analysis of solar parabolic trough with porous disc receiver,. Appl. Energ. 2009; 86: 1804–1812.

DOI: 10.1016/j.apenergy.2008.11.007

[4] A.A. Lambert, S. Cuevasa, J.A. Del Río. Enhanced heat transfer using oscillatory flows in solar collectors,. Sol. Energy 2006; 80: 1296–1302.

DOI: 10.1016/j.solener.2005.04.029

[5] J.A. Ackermann, L.E. Ong, S.C. Lau. Conjugate heat transfer in solar collector panels with internal longitudinal corrugated fins, – Part I: Overall results. Forschung Im Ingenieurwesen 1995; 61: 84–92.

DOI: 10.1007/bf02607958

[6] Y. Tian, C.Y. Zhao. A numerical investigation of heat transfer in phase change materials (PCMs) embedded in porous metals,. Energy 2011; 36: 5539–5546.

DOI: 10.1016/j.energy.2011.07.019

[7] S.P. Jang, and S.U. Choi, Role of Brownian motion in the enhanced thermal conductivity of nanofluids,. Applied Physics Letters, 84, 4316-4318. (2004).

DOI: 10.1063/1.1756684

[8] E. Boy, R. Boss, and M. Lutz, A Solar Collector Storage Module-With Integrated Phase Change Material, Proc. ISES, Pergamon Press, Hamburg, pp.3672-3680. (1987).