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Performance of a showcase refrigeration system with multi-evaporator during on–off cycling and hot-gas bypass defrost

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  • Cho, Honghyun
  • Kim, Yongchan
  • Jang, Inkyu

Abstract

During the defrosting process, the temperature in the cabinet of a showcase becomes higher than the set point. This phenomenon is undesirable for foods or products stored. It is essential to develop an efficient defrosting method to prevent large temperature fluctuations. In the present study, the performance of the showcase refrigeration system with three evaporators was measured during on–off cycling and hot-gas bypass defrost. Based on the test results, the effects of off-period in the on–off cycling and EEV opening in the hot-gas bypass defrosting cycle on the performance of showcase system were analyzed. In addition, the operating characteristics of the hot-gas bypass defrosting cycle were compared with those of the on–off cycling. The hot-gas bypass defrosting method showed higher refrigerating capacity and less temperature fluctuations than the on–off cycling under frosting/defrosting conditions even though it required more compressor power.

Suggested Citation

  • Cho, Honghyun & Kim, Yongchan & Jang, Inkyu, 2005. "Performance of a showcase refrigeration system with multi-evaporator during on–off cycling and hot-gas bypass defrost," Energy, Elsevier, vol. 30(10), pages 1915-1930.
    • Handle: RePEc:eee:energy:v:30:y:2005:i:10:p:1915-1930
    DOI: 10.1016/j.energy.2004.11.006
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    References listed on IDEAS

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    1. Yaqub, M & M. Zubair, Syed & Khan, Jameel-ur-Rehman, 2000. "Performance evaluation of hot-gas by-pass capacity control schemes for refrigeration and air-conditioning systems," Energy, Elsevier, vol. 25(6), pages 543-561.
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    Cited by:

    1. Song, Mengjie & Deng, Shiming & Dang, Chaobin & Mao, Ning & Wang, Zhihua, 2018. "Review on improvement for air source heat pump units during frosting and defrosting," Applied Energy, Elsevier, vol. 211(C), pages 1150-1170.
    2. Amer, Mohammed & Wang, Chi-Chuan, 2017. "Review of defrosting methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 53-74.
    3. Yin, Hai-Jiao & Yang, Zhao & Chen, Ai-Qiang & Zhang, Na, 2012. "Experimental research on a novel cold storage defrost method based on air bypass circulation and electric heater," Energy, Elsevier, vol. 37(1), pages 623-631.
    4. Wang, Fenghao & Wang, Zhihua & Zheng, Yuxin & Lin, Zhang & Hao, Pengfei & Huan, Chao & Wang, Tian, 2015. "Performance investigation of a novel frost-free air-source heat pump water heater combined with energy storage and dehumidification," Applied Energy, Elsevier, vol. 139(C), pages 212-219.
    5. Song, Mengjie & Pan, Dongmei & Li, Ning & Deng, Shiming, 2015. "An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting," Applied Energy, Elsevier, vol. 138(C), pages 598-604.
    6. Azmi, W.H. & Sharif, M.Z. & Yusof, T.M. & Mamat, Rizalman & Redhwan, A.A.M., 2017. "Potential of nanorefrigerant and nanolubricant on energy saving in refrigeration system – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 415-428.
    7. Belman-Flores, J.M. & Barroso-Maldonado, J.M. & Rodríguez-Muñoz, A.P. & Camacho-Vázquez, G., 2015. "Enhancements in domestic refrigeration, approaching a sustainable refrigerator – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 955-968.
    8. Huang, Dong & Li, Quanxu & Yuan, Xiuling, 2009. "Comparison between hot-gas bypass defrosting and reverse-cycle defrosting methods on an air-to-water heat pump," Applied Energy, Elsevier, vol. 86(9), pages 1697-1703, September.
    9. Jian Sun & Jianguo Li & Yuanli Liu & Zhijie Huang & Jinghui Cai, 2021. "A Novel Oil-free Dual Piston Compressor Driven by a Moving Coil Linear Motor with Capacity Regulation Using R134a," Sustainability, MDPI, vol. 13(9), pages 1-21, April.
    10. Kim, Jaehong & Choi, Hwan-Jong & Kim, Kyung Chun, 2015. "A combined Dual Hot-Gas Bypass Defrosting method with accumulator heater for an air-to-air heat pump in cold region," Applied Energy, Elsevier, vol. 147(C), pages 344-352.
    11. Christian J. L. Hermes & Joel Boeng & Diogo L. da Silva & Fernando T. Knabben & Andrew D. Sommers, 2021. "Evaporator Frosting in Refrigerating Appliances: Fundamentals and Applications," Energies, MDPI, vol. 14(18), pages 1-23, September.
    12. Liang, Jierong & Sun, Li & Li, Tingxun, 2018. "A novel defrosting method in gasoline vapor recovery application," Energy, Elsevier, vol. 163(C), pages 751-765.
    13. Choi, Hwan-Jong & Kim, Byung-Soon & Kang, Donghoon & Kim, Kyung Chun, 2011. "Defrosting method adopting dual hot gas bypass for an air-to-air heat pump," Applied Energy, Elsevier, vol. 88(12), pages 4544-4555.

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