بررسی عملکرد حرارتی مایعات آلی و روغن‌های ترمینول بر راندمان انرژی و اگزرژی کلکتور خورشیدی صفحه مسطح

نوع مقاله : مقاله پژوهشی

نویسنده

گروه علوم مهندسی، دانشکدۀ فنی و مهندسی شرق گیلان، دانشگاه گیلان، رودسر

10.22059/ses.2023.360952.1036

چکیده

کلکتور خورشیدی صفحه مسطح به عنوان یک مبدل حرارتی، وظیفۀ جذب انرژی تابشی خورشید و انتقال گرما به سیال عامل را به عهده دارد. آب‌و‌هوا از رایج‌ترین سیالاتی‌اند که به عنوان سیال عامل در میان این کلکتورها جریان دارند. با توجه به اینکه میزان بازدهی از مهم‌ترین معیارها در ارزیابی این کلکتورها است سعی شده تا در مطالعۀ حاضر، چهار سیال از گروه مایعات آلی و روغن‌های ترمینول انتخاب و عملکرد حرارتی آن‌ها بر راندمان یک کلکتور خورشیدی صفحه مسطح مورد بررسی قرار گیرد. نتایج به‌دست‌آمده در مقالۀ حاضر، نشان می‌دهد که مایعات آلی در مقایسه با روغن‌های ترمینول دارای راندمان بیشتر و در جذب گرما از کلکتور و انتقال آن به سیال عامل دارای عملکرد بهتری هستند و علت آن نیز پایین‌تر بودن گرمای ویژۀ مایعات آلی در دمای کاری مطرح شده است. همچنین با افزایش شدت تابش خورشید، راندمان انرژی و اگزرژی کلکتور کاهش و میزان گرمای منتقل شده از سیال عامل به کلکتور افزایش خواهد یافت و با افزایش دمای محیط، راندمان اگزرژی و اگزرژی مفید کلکتور کاهش می‌یابد. مقادیر میانگین راندمان انرژی و اگزرژی بر اثر انتخاب سیال عامل در این طرح نشان می‌دهد ‌مایعات آلی بعد از آب می‌توانند بهترین سیال عامل در این نوع کلکتورها باشند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation Of The Thermal Performance Of Organic Liquids And Therminol Oils On The Energy Efficiency And Exergy Of The Flat Plate Solar Collector

نویسنده [English]

  • Mahtab Ahmadi
Department of Engineering Sciences, Faculty of Technology and Engineering, East of Guilan, University of Guilan, Rudsar, Iran
چکیده [English]

The flat plate solar collector as a heat exchanger is responsible for absorbing the radiant energy of the sun and transferring heat to the working fluid. Water and air are among the most common fluids that flow as the working fluid among these collectors. Considering that efficiency is one of the most important criteria in the evaluation of these collectors, in this study, four fluids from the group of organic liquids and therminol oils were selected and their thermal performance was investigated on the efficiency of a flat plate solar collector. The results obtained in this article show that organic liquids are more efficient compared to therminol oils and have better performance in absorbing heat from the collector and transferring it to the working fluid, and the reason for this is the lower specific heat of organic liquids. It is raised at working temperature. Also, with the increase in the intensity of solar radiation, the energy efficiency and exergy of the collector will decrease and the amount of heat transferred from the working fluid to the collector will increase, and with the increase of the ambient temperature, the exergy efficiency and useful exergy of the collector will decrease. The average values of energy efficiency and exergy due to the choice of working fluid in this design show that organic liquids can be the best working fluid in these type of collectors after water.

کلیدواژه‌ها [English]

  • Solar collector
  • Organic liquids
  • Therminol oils
  • Efficiency
[1].          A. Mwesigye, T. Bello-Ochende, and J. P. Meyer, “Numerical Investigation of Entropy Generation in a Parabolic Trough Receiver at Different Concentration Ratios”,2021. 
[2].          E. Bellos, C. T.-J. of T. A. and Calorimetry, and  undefined 2019, “Thermal efficiency enhancement of nanofluid-based parabolic trough collectors,” Springer, vol. 135, no. 1, pp. 597–608, Jan. 2018, doi: 10.1007/s10973-018-7056-7.
[3].          S. K.-P. in energy and combustion science and  undefined 2004, “Solar thermal collectors and applications,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0360128504000103
[4].          S. Mekhilef, R. Saidur, A. S.-R. and sustainable energy reviews, and  undefined 2011, “A review on solar energy use in industries,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S1364032110004533
[5].          A. Noghrehabadi, … E. H.-C. in N. and, and  undefined 2016, “An experimental investigation on the performance of a symmetric conical solar collector using SiO2/water nanofluid,” chal.usb.ac.ir, vol. 5, no. 1, pp. 23–29, 2017, doi: 10.7508/tpnms.2017.01.003.
[6].          Y. Tian and C. Y. Zhao, “A review of solar collectors and thermal energy storage in solar thermal applications,” Appl. Energy, vol. 104, pp. 538–553, Apr. 2013, doi: 10.1016/J.APENERGY.2012.11.051.
[7].          E. Zambolin, D. D. C.-S. Energy, and  undefined 2010, “Experimental analysis of thermal performance of flat plate and evacuated tube solar collectors in stationary standard and daily conditions,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0038092X10001799
[8].          S. Chamoli, “Exergy analysis of a flat plate solar collector,” J. Energy South. Africa, vol. 24, no. 3, pp. 8–13, 2013, doi: 10.17159/2413-3051/2013/v24i3a3137.
[9].          R. M. Mostafizur, M. G. Rasul, and M. N. Nabi, “Energy and exergy analyses of a flat plate solar collector using various nanofluids: An analytical approach,” Energies, vol. 14, no. 14, 2021, doi: 10.3390/en14144305.
[10].        J. Duffie, W. Beckman, and N. Blair, Solar engineering of thermal processes, photovoltaics and wind. 2020. Accessed: Jul. 05, 2023. [Online]. Available: https://books.google.com/books?hl=en&lr=&id=4vXPDwAAQBAJ&oi=fnd&pg=PR11&dq=Duffie,+J.A.,+W.A.+Beckman,+and+N.+Blair,+Solar+engineering+of+thermal+processes,+photovoltaics+and+wind.+2020:+John+Wiley+%26+Sons.&ots=kwvDXPmGMN&sig=zRrxDI2b4RLMfNhMp0YfT5HPgIc
[11].        M. Izquierdo, A. González-Gil, E. P.-A. Energy, and  undefined 2014, “Solar-powered single-and double-effect directly air-cooled LiBr–H2O absorption prototype built as a single unit,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0306261914005236
 
[12].        C. Dorfling, C. Hornung, … B. H.-S. E. M., and  undefined 2010, “The experimental response and modelling of a solar heat collector fabricated from plastic microcapillary films,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0927024810001261
[13].        F. Incropera, D. DeWitt, T. Bergman, and A. Lavine, Fundamentals of heat and mass transfer. 1996. Accessed: Jul. 05, 2023. [Online]. Available: http://www.mid-contracting.com/sites/default/files/webform/careers_webform/_sid_/pdf-fundamentals-of-heat-and-mass-transfer-frank-p-incropera-david-p-dewitt-pdf-download-free-book-7841c05.pdf
[14].        H. Taherian, A. Rezania, S. Sadeghi, D. G.-E. C. and, and  undefined 2011, “Experimental validation of dynamic simulation of the flat plate collector in a closed thermosyphon solar water heater,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0196890410002840
[15].        A. Suzuki, “A fundamental equation for exergy balance on solar collectors,” 1988, Accessed: Jul. 05, 2023. [Online]. Available: https://asmedigitalcollection.asme.org/solarenergyengineering/article-abstract/110/2/102/418335
[16].        A. S.- Energy and  undefined 1988, “General theory of exergy-balance analysis and application to solar collectors,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/0360544288900400
[17].        “Kotas, T., The Exergy Analysis Method of Thermal... - Google Scholar.” https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=Kotas%2C+T.%2C+The+Exergy+Analysis+Method+of+Thermal+Plant+Analysis%2C+Krieger.+Melbourne%2C+Australia%2C+1995.&btnG= (accessed Jul. 05, 2023).
[18].        U. L.-P. A. S. M. and its Applications and  undefined 2016, “Econophysics and bio-chemical engineering thermodynamics: The exergetic analysis of a municipality,” Elsevier, Accessed: Jul. 05, 2023. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0378437116303946
[19].        Z. Ge, H. Wang, H. Wang, S. Zhang, X. G.- Entropy, and  undefined 2014, “Exergy analysis of flat plate solar collectors,” mdpi.com, vol. 16, pp. 2549–2567, 2014, doi: 10.3390/e16052549.