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Transient model of a vertical freezer with door openings and defrost effects

Author

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  • Mastrullo, R.
  • Mauro, A.W.
  • Menna, L.
  • Palma, A.
  • Vanoli, G.P.

Abstract

Cabinet temperature evolution and energy consumption are two parameters of primary importance for food/medicals preservation and energy savings in cold appliances. In this paper, a transient model of a vertical freezer is developed to study the trend of cabinet temperature and of energy consumption with time, taking also into account door openings, air leakage, frost formation and defrost effect. The model is validated with the experimental data, both with in-house data and with data available in the open literature for frost formation. The results are presented with varying operating conditions, such as air temperature, air humidity, frequency of door opening and defrosting. A qualitative comparison of the trends of air temperature inside the cabinet and of power consumption showed a good agreement between the experimental and simulated profiles; a good agreement was also found in the statistical analysis of errors, with maximum absolute errors on the time averaged temperature of air inside the cabinet of the order of 4K and maximum relative error on the time averaged power consumption of the order of 4%. Sensitivity analyses are reported as examples to exploit the potential of the model as a tool for design of systems, for settings for defrost parameters and for preventing fault events for food/medical preservation.

Suggested Citation

  • Mastrullo, R. & Mauro, A.W. & Menna, L. & Palma, A. & Vanoli, G.P., 2014. "Transient model of a vertical freezer with door openings and defrost effects," Applied Energy, Elsevier, vol. 121(C), pages 38-50.
    • Handle: RePEc:eee:appene:v:121:y:2014:i:c:p:38-50
    DOI: 10.1016/j.apenergy.2014.01.069
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    References listed on IDEAS

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    1. Borges, Bruno N. & Hermes, Christian J.L. & Gonçalves, Joaquim M. & Melo, Cláudio, 2011. "Transient simulation of household refrigerators: A semi-empirical quasi-steady approach," Applied Energy, Elsevier, vol. 88(3), pages 748-754, March.
    2. Hermes, Christian J.L. & Melo, Cláudio & Knabben, Fernando T. & Gonçalves, Joaquim M., 2009. "Prediction of the energy consumption of household refrigerators and freezers via steady-state simulation," Applied Energy, Elsevier, vol. 86(7-8), pages 1311-1319, July.
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    1. Alzuwaid, F.A. & Ge, Y.T. & Tassou, S.A. & Sun, J., 2016. "The novel use of phase change materials in an open type refrigerated display cabinet: A theoretical investigation," Applied Energy, Elsevier, vol. 180(C), pages 76-85.
    2. Harrington, Lloyd & Aye, Lu & Fuller, Bob, 2018. "Impact of room temperature on energy consumption of household refrigerators: Lessons from analysis of field and laboratory data," Applied Energy, Elsevier, vol. 211(C), pages 346-357.
    3. Huang, Tao & Bacher, Peder & Møller, Jan Kloppenborg & D’Ettorre, Francesco & Markussen, Wiebke Brix, 2023. "A step towards digital operations—A novel grey-box approach for modelling the heat dynamics of ultra-low temperature freezing chambers," Applied Energy, Elsevier, vol. 349(C).
    4. Zeyu Wang & Ravi S. Srinivasan, 2015. "Classification of Household Appliance Operation Cycles: A Case-Study Approach," Energies, MDPI, vol. 8(9), pages 1-15, September.
    5. Borges, Bruno N. & Melo, Cláudio & Hermes, Christian J.L., 2015. "Transient simulation of a two-door frost-free refrigerator subjected to periodic door opening and evaporator frosting," Applied Energy, Elsevier, vol. 147(C), pages 386-395.

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