IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v13y2020i17p4306-d401284.html
   My bibliography  Save this article

Numerical Analysis and Preliminary Experiment of a Solar Assisted Heat Pump Drying System for Chinese Wolfberry

Author

Listed:
  • Zhongting Hu

    () (Department of Building Environment and Equipment, Hefei University of Technology, Hefei 230009, China)

  • Sheng Zhang

    () (Department of Building Environment and Equipment, Hefei University of Technology, Hefei 230009, China)

  • Wenfeng Chu

    () (Department of Building Environment and Equipment, Hefei University of Technology, Hefei 230009, China)

  • Wei He

    () (Department of Building Environment and Equipment, Hefei University of Technology, Hefei 230009, China)

  • Cairui Yu

    () (Department of Building Environment and Equipment, Hefei University of Technology, Hefei 230009, China)

  • Hancheng Yu

    () (Department of Scientific Research and Technology, Qinghai College of Architectural Technology, Xining 810002, China)

Abstract

The present work investigated a solar assisted heat pump system for drying Chinese wolfberry. The kinetic characteristic was firstly analyzed through a series of lab experiments. It was concluded that the Page model was the most suitable for predicting the heat and mass transfer of the wolfberry. Based on the wolfberry kinetic model, solar collector model and chamber air model, the coupled drying system model was developed. The accuracy of the mathematic model was determined through comparing with the preliminary experimental results. The influence of operating conditions on the thermal and energy performance of the dryer for the different operating mode was discussed. The drying weight of no more than 75 kg may be preferable in the stand-alone solar drying mode, and less than 15 h was needed to be dried. The electric energy consumption in the solar assisted the heat pump drying mode was lower than that in the stand-alone heat pump mode, and it was recommended that about 50 kg of wolfberry to be dried in the solar assisted heat pump system. Compared to the autumn drying, the reduction in the electric energy consumption was around 9.1 kWh during the 11 h summer drying process. The obtained results demonstrated the feasibility of the combined system for drying wolfberry, and also can provide the basic theoretical and experimental data support for the following research.

Suggested Citation

  • Zhongting Hu & Sheng Zhang & Wenfeng Chu & Wei He & Cairui Yu & Hancheng Yu, 2020. "Numerical Analysis and Preliminary Experiment of a Solar Assisted Heat Pump Drying System for Chinese Wolfberry," Energies, MDPI, Open Access Journal, vol. 13(17), pages 1-16, August.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4306-:d:401284
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/13/17/4306/pdf
    Download Restriction: no

    File URL: https://www.mdpi.com/1996-1073/13/17/4306/
    Download Restriction: no

    References listed on IDEAS

    as
    1. Chauhan, Prashant Singh & Kumar, Anil & Nuntadusit, Chayut, 2018. "Heat transfer analysis of PV integrated modified greenhouse dryer," Renewable Energy, Elsevier, vol. 121(C), pages 53-65.
    2. Yaovi Ouézou Azouma & Lynn Drigalski & Zdeněk Jegla & Marcus Reppich & Vojtěch Turek & Maximilian Weiß, 2019. "Indirect Convective Solar Drying Process of Pineapples as Part of Circular Economy Strategy," Energies, MDPI, Open Access Journal, vol. 12(15), pages 1-18, July.
    3. Guo, Chao & Ji, Jie & Sun, Wei & Ma, Jinwei & He, Wei & Wang, Yanqiu, 2015. "Numerical simulation and experimental validation of tri-functional photovoltaic/thermal solar collector," Energy, Elsevier, vol. 87(C), pages 470-480.
    4. Morad, M.M. & El-Shazly, M.A. & Wasfy, K.I. & El-Maghawry, Hend A.M., 2017. "Thermal analysis and performance evaluation of a solar tunnel greenhouse dryer for drying peppermint plants," Renewable Energy, Elsevier, vol. 101(C), pages 992-1004.
    5. Irene Montero & María Teresa Miranda & Francisco José Sepúlveda & José Ignacio Arranz & Carmen Victoria Rojas & Sergio Nogales, 2015. "Solar Dryer Application for Olive Oil Mill Wastes," Energies, MDPI, Open Access Journal, vol. 8(12), pages 1-15, December.
    6. Atalay, Halil, 2019. "Performance analysis of a solar dryer integrated with the packed bed thermal energy storage (TES) system," Energy, Elsevier, vol. 172(C), pages 1037-1052.
    7. Bi, Yuehong & Guo, Tingwei & Zhang, Liang & Chen, Lingen, 2004. "Solar and ground source heat-pump system," Applied Energy, Elsevier, vol. 78(2), pages 231-245, June.
    8. Hawlader, M. N. A. & Chou, S. K. & Jahangeer, K. A. & Rahman, S. M. A. & Lau K. W., Eugene, 2003. "Solar-assisted heat-pump dryer and water heater," Applied Energy, Elsevier, vol. 74(1-2), pages 185-193, January.
    9. Lingayat, Abhay Bhanudas & Chandramohan, V.P. & Raju, V.R.K. & Meda, Venkatesh, 2020. "A review on indirect type solar dryers for agricultural crops – Dryer setup, its performance, energy storage and important highlights," Applied Energy, Elsevier, vol. 258(C).
    10. repec:gam:jeners:v:8:y:2015:i:12:p:14049-14063:d:60524 is not listed on IDEAS
    11. Tiwari, Sumit & Agrawal, Sanjay & Tiwari, G.N., 2018. "PVT air collector integrated greenhouse dryers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 142-159.
    12. Varun Kumar B. & G. Manikandan & P. Rajesh Kanna & Dawid Taler & Jan Taler & Marzena Nowak-Ocłoń & Karol Mzyk & Hoong Thiam Toh, 2018. "A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review," Energies, MDPI, Open Access Journal, vol. 11(11), pages 1-20, November.
    Full references (including those not matched with items on IDEAS)

    More about this item

    Keywords

    solar drying; heat pump; Chinese wolfberry; kinetic characteristic; electric energy;

    JEL classification:

    • Q - Agricultural and Natural Resource Economics; Environmental and Ecological Economics
    • Q0 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General
    • Q4 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy
    • Q40 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - General
    • Q41 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Demand and Supply; Prices
    • Q42 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Alternative Energy Sources
    • Q43 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy and the Macroeconomy
    • Q47 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy Forecasting
    • Q48 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Government Policy
    • Q49 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Other

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4306-:d:401284. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (XML Conversion Team). General contact details of provider: https://www.mdpi.com/ .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.