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Effect of air recirculation and heat pump on mass transfer and energy parameters in drying of kiwifruit slices

Author

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  • Mohammadi, Iman
  • Tabatabaekoloor, Reza
  • Motevali, Ali

Abstract

The simultaneous transfer of mass and heat in the drying process has turned it into a complicated process with respect to mass transfer and moisture removal. A hot-air dryer equipped with an auxiliary heat pump and air recirculation system was used to dry kiwifruit slices at three different temperatures (45, 55 and 65 °C) to determine mass transfer and activation energy using two different models, namely Dincer-Dost and Crank's models. When the heat pump was on, compared with 45 °C and air recirculation rate (0%) at higher temperature (65 °C) and higher air recirculation rate (100%) the drying rate constant increased from 1.113 × 10−4 s−1 to 2.357 × 10−4 s−1and the effective moisture diffusion coefficient increased from 1.94 × 10−9 m2/s to 7.12 × 10−9 m2/s. When the heat pump was off, both parameters decreased with increasing recirculation (from 0 to 100%) and increased with rising the temperature (from 45 to 65 °C). When the heat pump was turn off and on, at 65 °C and 100% recirculation the change in the range of activation energy, convective mass transfer coefficient, specific energy consumption, drying efficiency and specific moisture extraction rate (SMER) were 14.04–20.39 kJ/mol, 4.12–8.55 × 10−7 m/s, 1.08–1.49 kWh/kg, 9.84–12.15% and 0.11–0.15 kg/kWh, respectively.

Suggested Citation

  • Mohammadi, Iman & Tabatabaekoloor, Reza & Motevali, Ali, 2019. "Effect of air recirculation and heat pump on mass transfer and energy parameters in drying of kiwifruit slices," Energy, Elsevier, vol. 170(C), pages 149-158.
    • Handle: RePEc:eee:energy:v:170:y:2019:i:c:p:149-158
    DOI: 10.1016/j.energy.2018.12.099
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    Cited by:

    1. Li, K. & Zhang, Y. & Wang, Y.F. & El-Kolaly, W. & Gao, M. & Sun, W. & Li, M., 2021. "Effects of drying variables on the characteristic of the hot air drying for gastrodia elata: Experiments and multi-variable model," Energy, Elsevier, vol. 222(C).
    2. Li, Chengjie & Chen, Yifu & Zhang, Xuefeng & Mozafari, Ghazaleh & Fang, Zhuangdong & Cao, Yankai & Li, Changyou, 2022. "Exergy analysis and optimisation of an industrial-scale circulation counter-flow paddy drying process," Energy, Elsevier, vol. 251(C).
    3. Yahya, M. & Rachman, Arfidian & Hasibuan, R., 2022. "Performance analysis of solar-biomass hybrid heat pump batch-type horizontal fluidized bed dryer using multi-stage heat exchanger for paddy drying," Energy, Elsevier, vol. 254(PB).
    4. Cheng, Jia-Hao & Cao, Xiang & Shao, Liang-Liang & Zhang, Chun-Lu, 2023. "Performance evaluation of a novel heat pump system for drying with EVI-compressor driven precooling and reheating," Energy, Elsevier, vol. 278(PB).
    5. Xing, Tianyu & Luo, Xi & Li, Ming & Wang, Yunfeng & Deng, Zhihan & Yao, Muchi & Zhang, Wenxiang & Zhang, Zude & Gao, Meng, 2023. "Study on drying characteristics of Gentiana macrophylla under the interaction of temperature and relative humidity," Energy, Elsevier, vol. 273(C).
    6. Arley Salazar-Hincapié & Alvaro Delgado-Mejía & Andrés Felipe Romero-Maya & Eduardo Duque-Grisales, 2020. "Experimental Assessment of the Thermal Performance of a Heat Pump Dryer System Based on the Variations in Compressor Discharge Pressure on Oregano Drying," Energies, MDPI, vol. 13(23), pages 1-14, December.
    7. Choi, JunYoung & Lee, DongChan & Park, Myeong Hyeon & Lee, Yongju & Kim, Yongchan, 2021. "Effects of compressor frequency and heat exchanger geometry on dynamic performance characteristics of heat pump dryers," Energy, Elsevier, vol. 235(C).

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