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Thermal optimization of combined heat and power (CHP) systems using nanofluids

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  • Kazemi-Beydokhti, Amin
  • Zeinali Heris, Saeed

Abstract

In the present work, we focus on an incomplete combined heat and power (CHP) system. The supplementary thermal performance has been designed to increase the efficiency of the heating system by designing a shell and tube heat exchanger to recover the heat from the exhaust gases. A plate heat exchanger has also been designed for cooling the biogas-diesel generator and the exhaust gases. Two types of nanofluids with the same concentration (4% v/v) were then prepared for use as the circulating fluid to recover heating power from the CHP system. The results show that using nanofluids enhances the thermal performance of the CHP system, and the use of aqueous CuO is more advantageous than the use of aqueous Al2O3 as a cooling nanofluid. This change also causes a dramatic increase in the outlet flow of the hot water from the unit.

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  • Kazemi-Beydokhti, Amin & Zeinali Heris, Saeed, 2012. "Thermal optimization of combined heat and power (CHP) systems using nanofluids," Energy, Elsevier, vol. 44(1), pages 241-247.
    • Handle: RePEc:eee:energy:v:44:y:2012:i:1:p:241-247
    DOI: 10.1016/j.energy.2012.06.033
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    Cited by:

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    3. Aprea, C. & Greco, A. & Maiorino, A. & Masselli, C., 2020. "The use of barocaloric effect for energy saving in a domestic refrigerator with ethylene-glycol based nanofluids: A numerical analysis and a comparison with a vapor compression cooler," Energy, Elsevier, vol. 190(C).
    4. Firoozzadeh, Mohammad & Shiravi, Amir Hossein & Lotfi, Marzieh & Aidarova, Saule & Sharipova, Altynay, 2021. "Optimum concentration of carbon black aqueous nanofluid as coolant of photovoltaic modules: A case study," Energy, Elsevier, vol. 225(C).
    5. Hans-Joachim Naegele & Bernd Thomas & Christine Schrade & Andreas Lemmer & Hans Oechsner & Thomas Jungbluth, 2013. "Influence of Maintenance Intervals on Performance and Emissions of a 192 kW el Biogas Gas Otto CHP Unit and Results of Lubricating Oil Quality Tests—Outcome from a Continuous Two-Year Measuring Campai," Energies, MDPI, vol. 6(6), pages 1-21, June.
    6. Bahiraei, Mehdi & Hangi, Morteza, 2014. "Numerical simulation of nanofluid application in a C-shaped chaotic channel: A potential approach for energy efficiency improvement," Energy, Elsevier, vol. 74(C), pages 863-870.
    7. Zare, A. Darabadi & Saray, R. Khoshbakhti & Mirmasoumi, S. & Bahlouli, K., 2019. "Optimization strategies for mixing ratio of biogas and natural gas co-firing in a cogeneration of heat and power cycle," Energy, Elsevier, vol. 181(C), pages 635-644.

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