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Exergy analysis of an isothermal heat pump dryer

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  • Catton, Will
  • Carrington, Gerry
  • Sun, Zhifa

Abstract

A numerical simulation of a plate contact-type isothermal heat pump dryer (HPD) is used to examine the energy efficiency improvement obtainable from this system compared with a conventional HPD. While we consider this system design to be entirely feasible, we are not aware of any existing practical applications of the design. The simulation incorporates a detailed plate, product and air flow model, solving the mass, momentum and energy balances within the drier, into a pre-existing model of the remaining HPD components. The accuracy of an idealised drier-duct model used in a previous analysis is assessed. Although the accuracy of the idealised model is found to be sensitive to local system temperature variations, this is found not to lead to significant error when it is integrated into the whole-system HPD model. The energy efficiency benefit associated with the isothermal contact HPD is confirmed to be a factor of between 2 and 3. An exergy analysis is used to determine the causes of this perfomance gain. Contact heat transfer in isothermal HPD is found to reduce irreversibility within the refrigerant cycle by roughly the same amount as that occurring in heat transfer from the condenser to the product.

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  • Catton, Will & Carrington, Gerry & Sun, Zhifa, 2011. "Exergy analysis of an isothermal heat pump dryer," Energy, Elsevier, vol. 36(8), pages 4616-4624.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:8:p:4616-4624
    DOI: 10.1016/j.energy.2011.03.038
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    References listed on IDEAS

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    1. Ghoshray, Atanu & Johnson, Ben, 2010. "Trends in world energy prices," Energy Economics, Elsevier, vol. 32(5), pages 1147-1156, September.
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    Cited by:

    1. Çakır, Uğur & Çomaklı, Kemal & Çomaklı, Ömer & Karslı, Süleyman, 2013. "An experimental exergetic comparison of four different heat pump systems working at same conditions: As air to air, air to water, water to water and water to air," Energy, Elsevier, vol. 58(C), pages 210-219.
    2. Aziz, Muhammad & Oda, Takuya & Kashiwagi, Takao, 2014. "Integration of energy-efficient drying in microalgae utilization based on enhanced process integration," Energy, Elsevier, vol. 70(C), pages 307-316.
    3. Gluesenkamp, Kyle R. & Boudreaux, Philip & Patel, Viral K. & Goodman, Dakota & Shen, Bo, 2019. "An efficient correlation for heat and mass transfer effectiveness in tumble-type clothes dryer drums," Energy, Elsevier, vol. 172(C), pages 1225-1242.
    4. Motevali, Ali & Minaei, Saeid & Khoshtaghaza, Mohammad Hadi & Amirnejat, Hamed, 2011. "Comparison of energy consumption and specific energy requirements of different methods for drying mushroom slices," Energy, Elsevier, vol. 36(11), pages 6433-6441.
    5. Liu, Ming & Yan, JunJie & Chong, DaoTong & Liu, JiPing & Wang, JinShi, 2013. "Thermodynamic analysis of pre-drying methods for pre-dried lignite-fired power plant," Energy, Elsevier, vol. 49(C), pages 107-118.
    6. Ziya Sogut, M., 2012. "Exergetic and environmental assessment of room air conditioners in Turkish market," Energy, Elsevier, vol. 46(1), pages 32-41.
    7. M. Šeďová & R. Adamovský & P. Neuberger, 2013. "Analysis of ground massif temperatures with horizontal heat exchanger," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 59(3), pages 91-97.
    8. Aghbashlo, Mortaza & Mobli, Hossein & Rafiee, Shahin & Madadlou, Ashkan, 2013. "A review on exergy analysis of drying processes and systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 22(C), pages 1-22.

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