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Energies 2014, 7(12), 8465-8482; doi:10.3390/en7128465

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

Department of Engineering for Innovation, University of Salento, via Monteroni, Lecce I-73100, Italy
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Received: 17 September 2014 / Revised: 4 November 2014 / Accepted: 8 December 2014 / Published: 22 December 2014
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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. View Full-Text
Keywords: geothermal; ground source heat pump; ventilation; Computational Fluid Dynamic (CFD); Zero Energy Buildings (ZEB); ground heat exchanger; high efficiency; heating and cooling of buildings; horizontal heat exchanger; typical climates geothermal; ground source heat pump; ventilation; Computational Fluid Dynamic (CFD); Zero Energy Buildings (ZEB); ground heat exchanger; high efficiency; heating and cooling of buildings; horizontal heat exchanger; typical climates
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Congedo, P.M.; Lorusso, C.; De Giorgi, M.G.; Laforgia, D. Computational Fluid Dynamic Modeling of Horizontal Air-Ground Heat Exchangers (HAGHE) for HVAC Systems. Energies 2014, 7, 8465-8482.

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