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Thermodynamic analysis of a milk pasteurization process assisted by geothermal energy

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  • Yildirim, Nurdan
  • Genc, Seda

Abstract

Renewable energy system is an important concern for sustainable development of the World. Thermodynamic analysis, especially exergy analysis is an intense tool to assess sustainability of the systems. Food processing industry is one of the energy intensive sectors where dairy industry consumes substantial amount of energy among other food industry segments. Therefore, in this study, thermodynamic analysis of a milk pasteurization process assisted by geothermal energy was studied. In the system, a water–ammonia VAC (vapor absorption cycle), a cooling section, a pasteurizer and a regenerator were used for milk pasteurization. Exergetic efficiencies of each component and the whole system were separately calculated. A parametric study was undertaken. In this regard, firstly the effect of the geothermal resource temperature on (i) the total exergy destruction of the absorption cycle and the whole system, (ii) the efficiency of the VAC, the whole system and COP (coefficient of performance) of the VAC, (iii) the flow rate of the pasteurized milk were investigated. Then, the effect of the geothermal resource flow rate on the pasteurization load was analyzed. The exergetic efficiency of the whole system was calculated as 56.81% with total exergy destruction rate of 13.66 kW. The exergetic results were also illustrated through the Grassmann diagram.

Suggested Citation

  • Yildirim, Nurdan & Genc, Seda, 2015. "Thermodynamic analysis of a milk pasteurization process assisted by geothermal energy," Energy, Elsevier, vol. 90(P1), pages 987-996.
    • Handle: RePEc:eee:energy:v:90:y:2015:i:p1:p:987-996
    DOI: 10.1016/j.energy.2015.08.003
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    References listed on IDEAS

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    5. Meraj, Md & Mahmood, S.M. & Khan, M.E. & Azhar, Md & Tiwari, G.N., 2021. "Effect of N-Photovoltaic thermal integrated parabolic concentrator on milk temperature for pasteurization: A simulation study," Renewable Energy, Elsevier, vol. 163(C), pages 2153-2164.
    6. Dowlati, Majid & Aghbashlo, Mortaza & Mojarab Soufiyan, Mohamad, 2017. "Exergetic performance analysis of an ice-cream manufacturing plant: A comprehensive survey," Energy, Elsevier, vol. 123(C), pages 445-459.
    7. Bühler, Fabian & Zühlsdorf, Benjamin & Nguyen, Tuong-Van & Elmegaard, Brian, 2019. "A comparative assessment of electrification strategies for industrial sites: Case of milk powder production," Applied Energy, Elsevier, vol. 250(C), pages 1383-1401.
    8. Mojarab Soufiyan, Mohamad & Dadak, Ali & Hosseini, Seyed Sina & Nasiri, Farshid & Dowlati, Majid & Tahmasebi, Maryam & Aghbashlo, Mortaza, 2016. "Comprehensive exergy analysis of a commercial tomato paste plant with a double-effect evaporator," Energy, Elsevier, vol. 111(C), pages 910-922.
    9. Aghbashlo, Mortaza & Mandegari, Mohsen & Tabatabaei, Meisam & Farzad, Somayeh & Mojarab Soufiyan, Mohamad & Görgens, Johann F., 2018. "Exergy analysis of a lignocellulosic-based biorefinery annexed to a sugarcane mill for simultaneous lactic acid and electricity production," Energy, Elsevier, vol. 149(C), pages 623-638.

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