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Computational Fluid Dynamic Modeling of Horizontal Air-Ground Heat Exchangers (HAGHE) for HVAC Systems

Author

Listed:
  • Paolo Maria Congedo

    (Department of Engineering for Innovation, University of Salento, via Monteroni, Lecce I-73100, Italy
    These authors contributed equally to this work.)

  • Caterina Lorusso

    (Department of Engineering for Innovation, University of Salento, via Monteroni, Lecce I-73100, Italy
    These authors contributed equally to this work.)

  • Maria Grazia De Giorgi

    (Department of Engineering for Innovation, University of Salento, via Monteroni, Lecce I-73100, Italy
    These authors contributed equally to this work.)

  • Domenico Laforgia

    (Department of Engineering for Innovation, University of Salento, via Monteroni, Lecce I-73100, Italy
    These authors contributed equally to this work.)

Abstract

In order to satisfy the requirements of Directive 2010/31/EU for Zero Energy Buildings (ZEB), innovative solutions were investigated for building HVAC systems. Horizontal air-ground heat exchangers (HAGHE) offer a significant contribution in reducing energy consumption for ventilation, using the thermal energy stored underground, in order to pre-heat or pre-cool the ventilation air, in winter and summer, respectively. This is particularly interesting in applications for industrial, commercial and education buildings where keeping the indoor air quality under control is extremely important. Experimental measurements show that, throughout the year, the outside air temperature fluctuations are mitigated at sufficient ground depth (about 3 m) because of the high thermal inertia of the soil, the ground temperature is relatively constant and instead higher than that of the outside air in winter and lower in summer. The study aims to numerically investigate the behavior of HAGHE by varying the air flow rate and soil conductivity in unsteady conditions by using annual weather data of South-East Italy. The analysis shows that, in warm climates, the HAGHE brings a real advantage for only a few hours daily in winter, while it shows significant benefits in the summer for the cooling of ventilation air up to several temperature degrees, already by a short pipe.

Suggested Citation

  • Paolo Maria Congedo & Caterina Lorusso & Maria Grazia De Giorgi & Domenico Laforgia, 2014. "Computational Fluid Dynamic Modeling of Horizontal Air-Ground Heat Exchangers (HAGHE) for HVAC Systems," Energies, MDPI, vol. 7(12), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:12:p:8465-8482:d:43781
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    References listed on IDEAS

    as
    1. Genchi, Yutaka & Kikegawa, Yukihiro & Inaba, Atsushi, 2002. "CO2 payback-time assessment of a regional-scale heating and cooling system using a ground source heat-pump in a high energy-consumption area in Tokyo," Applied Energy, Elsevier, vol. 71(3), pages 147-160, March.
    2. Badescu, Viorel, 2007. "Economic aspects of using ground thermal energy for passive house heating," Renewable Energy, Elsevier, vol. 32(6), pages 895-903.
    Full references (including those not matched with items on IDEAS)

    Citations

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    Cited by:

    1. Cristina Baglivo & Delia D’Agostino & Paolo Maria Congedo, 2018. "Design of a Ventilation System Coupled with a Horizontal Air-Ground Heat Exchanger (HAGHE) for a Residential Building in a Warm Climate," Energies, MDPI, vol. 11(8), pages 1-27, August.
    2. Paolo Maria Congedo & Caterina Lorusso & Maria Grazia De Giorgi & Riccardo Marti & Delia D’Agostino, 2016. "Horizontal Air-Ground Heat Exchanger Performance and Humidity Simulation by Computational Fluid Dynamic Analysis," Energies, MDPI, vol. 9(11), pages 1-14, November.
    3. Congedo, Paolo Maria & Baglivo, Cristina & D'Agostino, Delia & Zacà, Ilaria, 2015. "Cost-optimal design for nearly zero energy office buildings located in warm climates," Energy, Elsevier, vol. 91(C), pages 967-982.
    4. Cristina Baglivo & Sara Bonuso & Paolo Maria Congedo, 2018. "Performance Analysis of Air Cooled Heat Pump Coupled with Horizontal Air Ground Heat Exchanger in the Mediterranean Climate," Energies, MDPI, vol. 11(10), pages 1-21, October.
    5. Xiang Gou & Yang Fu & Imran Ali Shah & Yamei Li & Guoyou Xu & Yue Yang & Enyu Wang & Liansheng Liu & Jinxiang Wu, 2016. "Research on a Household Dual Heat Source Heat Pump Water Heater with Preheater Based on ASPEN PLUS," Energies, MDPI, vol. 9(12), pages 1-16, December.
    6. Taurines, Kevin & Giroux-Julien, Stéphanie & Farid, Mohammed & Ménézo, Christophe, 2021. "Numerical modelling of a building integrated earth-to-air heat exchanger," Applied Energy, Elsevier, vol. 296(C).

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