Research Publications

Energy modelling of a new co-current coaxial earth – water to air- heat exchanger. Case study: Heating of house in Biskra – Algeria

Efficient and economical renewable energy system adapted to the Algerian geothermal context

Earth to air heat exchangers are preconditioning systems designed to preheat the new air of buildings in winter.
This paper suggests a study of a new horizontal coaxial earth /water/air heat exchanger (EWAHE) where hot
water flows in the centre of the exchanger. After an analytical study of the exchanger in steady state regime, its
coupling with the surrounding earth modeled in transient regime by spatio-temporal discretization; we obtain a
very good correlation of our model under MATLAB with an equivalent three-dimensional CFD model. A parametric
study, shows the influence of the ratio of inner diameter/ outer diameter, thermal conductivity of the
inner tube and air flow rate/ water flow rate ratio on the energy efficiency of the system. Lastly, a case study of
heating a building under Trnsys in south-eastern Algerian climate proves the energy benefits of this coaxial
exchanger for cooling drinking water, naturally hot, in the region and to contribute effectively to preheating the
air. We ultimately show the possibility of its use in cooling mode.

Karim Dehina

Karim Dehina

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