IDEAS home Printed from https://ideas.repec.org/a/eee/renene/v96y2016ipap148-156.html
   My bibliography  Save this article

Surface roughness impact on the heat loss of solar vacuum heat collector elements (HCE)

Author

Listed:
  • Nakar, Doron
  • Feuermann, Daniel

Abstract

Heat losses from line focus solar collectors, such as parabolic troughs and Linear Fresnel Reflectors (LFR), are reduced by using selectively coated vacuum heat collector elements (HCE). The main parameters governing convective and radiative heat losses are the metal tube's outer surface radiative emittance and the vacuum level between tube and glass envelope. We investigate the effect of surface roughness on tube emittance as function of substrate roughness. Through a series of experiments, using several surface polishing techniques, such as grinding processes and electro polishing, a good correlation between tube surface roughness and heat loss was obtained. We show the limitations of representing the surface roughness by only using the roughness average (Ra) or the root mean square (RMS) roughness (Rq), especially when an electro polishing process is involved. A better metric is the roughness slope (1/Er) or RMS slope (RΔq) in addition to the roughness height (Rz) for which a good correlation to heat loss is demonstrated. While the electro polishing process is shown to reduce emittance and therefore heat losses, less costly and simpler changes in the grinding process can lead to a similar result. Recommendations for metal tube roughness yielding minimum heat loss are presented.

Suggested Citation

  • Nakar, Doron & Feuermann, Daniel, 2016. "Surface roughness impact on the heat loss of solar vacuum heat collector elements (HCE)," Renewable Energy, Elsevier, vol. 96(PA), pages 148-156.
    • Handle: RePEc:eee:renene:v:96:y:2016:i:pa:p:148-156
    DOI: 10.1016/j.renene.2016.04.041
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0960148116303433
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.renene.2016.04.041?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Fernández-García, A. & Zarza, E. & Valenzuela, L. & Pérez, M., 2010. "Parabolic-trough solar collectors and their applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(7), pages 1695-1721, September.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Okoroigwe, Edmund & Madhlopa, Amos, 2016. "An integrated combined cycle system driven by a solar tower: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 337-350.
    2. Camelia Stanciu & Dorin Stanciu & Adina-Teodora Gheorghian, 2017. "Thermal Analysis of a Solar Powered Absorption Cooling System with Fully Mixed Thermal Storage at Startup," Energies, MDPI, vol. 10(1), pages 1-19, January.
    3. Vélez, Fredy & Segovia, José J. & Martín, M. Carmen & Antolín, Gregorio & Chejne, Farid & Quijano, Ana, 2012. "A technical, economical and market review of organic Rankine cycles for the conversion of low-grade heat for power generation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(6), pages 4175-4189.
    4. Drosou, Vassiliki & Kosmopoulos, Panos & Papadopoulos, Agis, 2016. "Solar cooling system using concentrating collectors for office buildings: A case study for Greece," Renewable Energy, Elsevier, vol. 97(C), pages 697-708.
    5. Bitam, El Wardi & Demagh, Yassine & Hachicha, Ahmed A. & Benmoussa, Hocine & Kabar, Yassine, 2018. "Numerical investigation of a novel sinusoidal tube receiver for parabolic trough technology," Applied Energy, Elsevier, vol. 218(C), pages 494-510.
    6. Syed M. Hussain & Wasim Jamshed & Rabia Safdar & Faisal Shahzad & Nor Ain Azeany Mohd Nasir & Ikram Ullah, 2023. "Chemical reaction and thermal characteristiecs of Maxwell nanofluid flow-through solar collector as a potential solar energy cooling application: A modified Buongiorno's model," Energy & Environment, , vol. 34(5), pages 1409-1432, August.
    7. Wang, Ruilin & Qu, Wanjun & Hong, Hui & Sun, Jie & Jin, Hongguang, 2018. "Experimental performance of 300 kWth prototype of parabolic trough collector with rotatable axis and irreversibility analysis," Energy, Elsevier, vol. 161(C), pages 595-609.
    8. Hernández-Escobedo, Q. & Rodríguez-García, E. & Saldaña-Flores, R. & Fernández-García, A. & Manzano-Agugliaro, F., 2015. "Solar energy resource assessment in Mexican states along the Gulf of Mexico," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 216-238.
    9. El Kouche, Amal & Ortegón Gallego, Francisco, 2022. "Modeling and numerical simulation of a parabolic trough collector using an HTF with temperature dependent physical properties," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 192(C), pages 430-451.
    10. Kalogirou, Soteris A., 2012. "A detailed thermal model of a parabolic trough collector receiver," Energy, Elsevier, vol. 48(1), pages 298-306.
    11. Bernardos, Eva & López, Ignacio & Rodríguez, Javier & Abánades, Alberto, 2013. "Assessing the potential of hybrid fossil–solar thermal plants for energy policy making: Brayton cycles," Energy Policy, Elsevier, vol. 62(C), pages 99-106.
    12. Yang, Xiaoping & Yang, Xiaoxi & Ding, Jing & Shao, Youyuan & Fan, Hongbo, 2012. "Numerical simulation study on the heat transfer characteristics of the tube receiver of the solar thermal power tower," Applied Energy, Elsevier, vol. 90(1), pages 142-147.
    13. Kumaresan, G. & Sudhakar, P. & Santosh, R. & Velraj, R., 2017. "Experimental and numerical studies of thermal performance enhancement in the receiver part of solar parabolic trough collectors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 1363-1374.
    14. Ajbar, Wassila & Parrales, A. & Huicochea, A. & Hernández, J.A., 2022. "Different ways to improve parabolic trough solar collectors’ performance over the last four decades and their applications: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
    15. Fasquelle, T. & Falcoz, Q. & Neveu, P. & Lecat, F. & Flamant, G., 2017. "A thermal model to predict the dynamic performances of parabolic trough lines," Energy, Elsevier, vol. 141(C), pages 1187-1203.
    16. Sainz-Mañas, Miguel & Bataille, Françoise & Caliot, Cyril & Vossier, Alexis & Flamant, Gilles, 2022. "Direct absorption nanofluid-based solar collectors for low and medium temperatures. A review," Energy, Elsevier, vol. 260(C).
    17. Malagueta, Diego & Szklo, Alexandre & Borba, Bruno Soares Moreira Cesar & Soria, Rafael & Aragão, Raymundo & Schaeffer, Roberto & Dutra, Ricardo, 2013. "Assessing incentive policies for integrating centralized solar power generation in the Brazilian electric power system," Energy Policy, Elsevier, vol. 59(C), pages 198-212.
    18. Soria, Rafael & Portugal-Pereira, Joana & Szklo, Alexandre & Milani, Rodrigo & Schaeffer, Roberto, 2015. "Hybrid concentrated solar power (CSP)–biomass plants in a semiarid region: A strategy for CSP deployment in Brazil," Energy Policy, Elsevier, vol. 86(C), pages 57-72.
    19. Corral, Nicolás & Anrique, Nicolás & Fernandes, Dalila & Parrado, Cristóbal & Cáceres, Gustavo, 2012. "Power, placement and LEC evaluation to install CSP plants in northern Chile," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(9), pages 6678-6685.
    20. Wang, Ruilin & Sun, Jie & Hong, Hui, 2019. "Proposal of solar-aided coal-fired power generation system with direct steam generation and active composite sun-tracking," Renewable Energy, Elsevier, vol. 141(C), pages 596-612.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:renene:v:96:y:2016:i:pa:p:148-156. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/renewable-energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.