期刊
ENERGY CONVERSION AND MANAGEMENT
卷 88, 期 -, 页码 129-138出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2014.08.021
关键词
Minichannel solar collector; Entropy generation; Nanofluids; Efficiency
资金
- King Abdulaziz City for Science and Technology (KACST) through Science and Technology Unit at King Fahd University of Petroleum and Minerals (KFUPM) [13-ENE1573-04]
- Thailand Research Fund
- National Science and Technology Development Agency
- National Research University Project
In this paper, an analytical analysis has been performed to evaluate the performance of a minichannel-based solar collector using four different nanofluids including Cu/water, Al2O3/water, TiO2/water, and SiO2/water. The analysis of first and second laws is conducted for turbulent flow by considering the constant mass flow rate of nanofluid. The results are presented for volume fractions up to 4% and nanopartide size of 25 nm where the inner diameter of the risers of flat plate collector is assumed to be 2 mm. Analysis of the first law of thermodynamics reveals that Al2O3/water nanofluids show the highest heat transfer coefficient in the tubes while the lowest value belongs to SiO2/water nanofluids. The highest outlet temperature is provided by Cu/water nanofluids, and after that TiOdwater, Al2O3/water, and SiO2/water nanofluids are in ranks of second to fourth. The results of second law analysis elucidate that Cu/water nanofluid produces the lowest entropy generation among the nanofluids. It is found that although the effective thermal conductivity of TiO2/water nanofluids is less than Al2O3/water nanofluids, but the entropy generation of TiO2/water is lower than Al2O3/water. Finally, some recommendations are given for future studies on the applications of nanofluids in solar collectors. (C) 2014 Elsevier Ltd. All rights reserved.
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