Volume 18, Issue 7 (11-2018)                   Modares Mechanical Engineering 2018, 18(7): 41-49 | Back to browse issues page

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Bozorgi M, Karami M, Delfani S. Energy and exergy analysis of direct absorption solar collector by using silver nanofluid. Modares Mechanical Engineering 2018; 18 (7) :41-49
URL: http://mme.modares.ac.ir/article-15-15710-en.html
Energy and exergy analysis of direct absorption solar collector by using silver nanofluid
Mehran Bozorgi1 , Maryam Karami * 2, Shahram Delfani3
1- University of Tehran
2- Professor Assisstant, Kharazmi University
3- Road, Housing and Urban Development Research Center
Abstract:   (7740 Views)
In this study, energy and exergy efficiency of residential-type direct absorption solar collector using PVP-coated silver nanofluid has been evaluated experimentally. First, stability and thermophysical and optical properties of nanofluid have been considered using the theoretical and experimental methods. Then, outdoor thermal performance of collector is investigated using the experimental setup based on EN12975-2. Results of energy analysis show that the collector efficiency is increased by increase of flowrate and concentration of nanofluid asymptotically. It is observed that exergy efficiency is firstly increased by nanofluid concentration and then, decreased after reaching the optimum value. The optimum concentration was 500 ppm for all flowrates. The variation of exergy efficiency by reduced temperature difference is similar to volume fraction. The optimum exergy efficiency is obtained at 0.01 m2K/W. The decrease of exergy efficiency by flowrate indicated that exergy losses due to pressure drop have the significant effect on the collector performance.
Keywords: Direct Absorption Solar collector, Silver Nanofluid, Extinction Coefficient, Exergy Efficiency
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Article Type: Research Article | Subject: Aerospace Structures
Received: 2018/03/2 | Accepted: 2018/09/25 | Published: 2018/09/25
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