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Analysis of Energy Exchange with the Ground in a Two-Chamber Vegetable Cold Store, Assuming Different Lengths of Technological Break, with the Use of a Numerical Calculation Method—A Case Study

Author

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  • Paweł Sokołowski

    (Department of Rural Building, Faculty of Environmental Engineering, University of Agriculture in Krakow, al. Mickiewicza 24/28, 30-059 Krakow, Poland)

  • Grzegorz Nawalany

    (Department of Rural Building, Faculty of Environmental Engineering, University of Agriculture in Krakow, al. Mickiewicza 24/28, 30-059 Krakow, Poland)

Abstract

The paper deals with the impact of the technological break duration during the cold storage cycle on the energy demand of the cold store for vegetables and fruit and the temperature distribution in the ground under the cold store. The studied facility was a two-chamber vegetable cold store located in southern Poland used to store carrots ( Daucus carota ) for nine months a year. The experiments were conducted for 12 months (01.05.2017–30.04.2018). The technological break during this period lasted three months (from 1 July 2018 to 30 September 2018). Continuous measurements (with 1-h frequency) were made in order to determine the boundary conditions for numerical analysis. The measured parameters included indoor air temperature, outdoor air temperature, ground temperature under the building and in its vicinity. There were 22 measuring points andPT100 sensors were used. The numerical analysis was based on the elementary balances method. WUFIplus ® software was used as a calculation supporting tool. The numerical analysis was conducted for 14 calculation variants, with different duration of technological break. The calculation model validation was performed and the results showed a good correlation with the experimental data. The results of experimental studies and of calculations showed a significant impact of the technological break duration on the soil distribution in the ground and the building energy demand. A technological break of less than 4 weeks is the most optimal in the summer. The technological break longer than 4 weeks significantly affects the cooling energy demand in the first days of the cooling cycle and significantly extends the time necessary for the ground and the floor to reach the optimum temperature. The analysis of the floor temperature results (points A1–C1) showed that the technological break longer than four weeks causes the average floor temperature to exceed 4.0 °C. Therefore, the optimum solution is technological break lasting 7–35 days. Absence of technological break results in a decrease of energy gains from the ground by 20% relative to a three-month technological break. The impact of technological break duration was clearly seen in terms of energy losses from the cold store to the ground. In case of a 91-day technological break, the energy losses to the ground were 1289.5 kWh/a, while in case of absence of technological break this value was ninefold lower (147.5 kWh/a).

Suggested Citation

  • Paweł Sokołowski & Grzegorz Nawalany, 2020. "Analysis of Energy Exchange with the Ground in a Two-Chamber Vegetable Cold Store, Assuming Different Lengths of Technological Break, with the Use of a Numerical Calculation Method—A Case Study," Energies, MDPI, vol. 13(18), pages 1-15, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4970-:d:417337
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    References listed on IDEAS

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    1. Akkurt, G.G. & Aste, N. & Borderon, J. & Buda, A. & Calzolari, M. & Chung, D. & Costanzo, V. & Del Pero, C. & Evola, G. & Huerto-Cardenas, H.E. & Leonforte, F. & Lo Faro, A. & Lucchi, E. & Marletta, L, 2020. "Dynamic thermal and hygrometric simulation of historical buildings: Critical factors and possible solutions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 118(C).
    2. Grzegorz Nawalany & Paweł Sokołowski, 2020. "Improved Energy Management in an Intermittently Heated Building Using a Large Broiler House in Central Europe as an Example," Energies, MDPI, vol. 13(6), pages 1-12, March.
    3. James Bambara & Andreas K. Athienitis, 2018. "Energy and Economic Analysis for Greenhouse Ground Insulation Design," Energies, MDPI, vol. 11(11), pages 1-15, November.
    4. Tomasz Jakubowski & Jolanta B. Królczyk, 2020. "Method for the Reduction of Natural Losses of Potato Tubers During their Long-Term Storage," Sustainability, MDPI, vol. 12(3), pages 1-12, February.
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    Cited by:

    1. Paweł Sokołowski & Grzegorz Nawalany & Tomasz Jakubowski & Ernest Popardowski & Vasyl Lopushniak & Atilgan Atilgan, 2022. "Numerical Analysis of Thermal Impact between the Cooling Facility and the Ground," Energies, MDPI, vol. 15(24), pages 1-16, December.
    2. Grzegorz Nawalany & Paweł Sokołowski, 2021. "Numerical Analysis of the Effect of Ground Dampness on Heat Transfer between Greenhouse and Ground," Sustainability, MDPI, vol. 13(6), pages 1-10, March.
    3. Eduardo Roque & Romeu Vicente & Ricardo M. S. F. Almeida & Victor M. Ferreira, 2022. "The Impact of Thermal Inertia on the Indoor Thermal Environment of Light Steel Framing Constructions," Energies, MDPI, vol. 15(9), pages 1-17, April.
    4. Paweł Sokołowski & Grzegorz Nawalany & Małgorzata Michalik, 2022. "Analysis of the Impact of Flooring Material and Construction Solutions on Heat Exchange with the Ground in a Historic Wooden Building," Energies, MDPI, vol. 15(16), pages 1-17, August.

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