Numerical simulation of performance of direct absorption solar collector using carbon nanotube nanofluid
Document Type : Original Article
Authors
1 Mechanical and electrical Installations department- BHRC- Tehran-Iran
2 Member of scientific board
Abstract
Many recent studies have focused on enhanced performance of direct absorption solar collectors in which solar energy directly is absorbed within the fluid. In this study, the performance of direct absorption solar collector using carbon nanotube in the mixture of water and ethylene glycol as working fluid was numerically investigated. A 3-D numerical model is developed by FLUENT 15.0 software and the effect of various parameters such as internal surface emissivity, collector depth, working fluid volume fraction and flowrate on the collector efficiency and outlet temperature is evaluated by this model. The governing equations for mass, momentum and energy are solved by SIMPLE method and the radiative transfer equation is solved by Discrete Ordinate (DO) method. The radiative and thermal properties of nanofluid are determined using experimental methods. The results show that the operating parameters of the collector including efficiency and outlet temperature is increased by increasing the internal surface emissivity using the base fluid as working fluid. The increase of nanofluid volume fraction and collector depth is also results in the efficiency and outlet temperature enhancement.
Keywords
Main Subjects
[1] Arai,N., Itaya, Y., Hasatani, M., 1984, Development of a Volume heat-trap' typesolar collector using a fine-particle semitransparent liquid suspension (FPSS)as a heat vehicle and heat storage medium, Solar Energy, Vol. 32, pp. 49-56.
[2]Otanicar, T.P., Phelan, P.E., Golden, J.S., 2009, Optical Properties of Liquids for Direct Absorption Solar Thermal Energy Systems, SolarEnergy, Vol. 83, pp. 969-977.
[3] Minardi, J.E., Chuang, H.N., 1975, Performance of a "black" liquid flat-plate solar collector, Solar Energy, Vol.17, pp. 179-183.
[4] Miller, F.J., Koenigsdorff, R.W., 2000, Thermal modeling of a small-particle solarcentral receiver, Journal of Solar Energy Engineering, Vol.122, pp. 23-29.
[5] Tyagi, H., Phelan, P., Prasher, R.S., 2009, Predicted Efficiency of Nanofluid-Based Direct Absorption Solar Receiver, Journal of Solar Energy Engineering, Vol. 131.
[6] Otanicar, T.P., Phelan, P.E., Prasher, R.S., Rosengarten, G., Taylor, R.A., 2010, Nanofluid-based direct absorption solar collector, Journal ofRenewable and Sustainable Energy, Vol. 2.
[7] Ladjevardi, S.M., Asnaghi, A., Izadkhast, P.S., Kashani, A.H., 2013, Applicability of graphite nanofluids in direct solar energy absorption, Solar Energy, Vol. 94, pp. 327–334,.
[8] Parvin, S., Nasrin, R., Alim, M.A., 2014, Heat transfer and entropy generation through nanofluid
filled direct absorption solar collector, International Journal of Heat and Mass Transfer, Vol. 71, pp. 386–395.
[9] Lenert, A., Wang, E.N., 2012, Optimization of nanofluid volumetric receivers for solar thermal energy conversion, Solar Energy, Vol. 86, pp. 253–265.
[10] Siegel, R., Howell, J., 1992, Thermal radiation heat transfer, 3rd Edition, Hemisphere Publishing Corporation, USA.
[11] Brewster, M. Q., Tien, C. L., 1982, Radiative transfer in packed fluidized beds: dependent versus independent scattering, Journal of Heat Transfer, Vol. 104.
[12] Nasiri, A., Shariaty-Niasar, M., Rashidi, Amrollahi, A., Khodafarin, A. R., 2011, Effect of dispersion method on thermal conductivity and stability of nanofluid, Experimental Thermal and Fluid Science, Vol. 35, pp. 717–723.
[13] Taylor, R. A., Phelan, P. E., Otanicar, T. P., Adrian, R., Prasher, R., 2011, Nanofluid optical property characterization: towards efficient direct absorption solar collectors, Nanoscale Research Letters, Vol. 6.
[14] Karami, M., Delfani, S., Akhavan Bahabadi, M. A., 2016 Performance Characteristics of a Residential-type Direct Absorption Solar Collector using MWCNT Nanofluid, Renewable EnergyVol. 87 , pp. 754–764.
[15] Kumar, S., Tien, C.L., 1989, Analysis of combined radiation and convection in aparticulate laden falling film. Heat transfer Phenomena in Radiation, Combustion and Fires, National Heat Transfer Conference.
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Volume 11, Issue 3 - Serial Number 20
September 2017Pages 19-30
- Receive Date: 13 January 2018
- Accept Date: 22 January 2018