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Computational sensitivity analysis of horizontal heat exchangers for GSHPs


Autore: G. Starace, P.M. Congedo, G. Colangelo

Collana: BT - 34 - Mag 06 - Energy: production, distribution and conservation

The investigation was performed for two possible utilizations: a single flat and a commercial building. As the South of Italy requires both heating and cooling, the systems were studied for both winter and summer operation.
The analysis on the horizontal heat exchangers for GSHPs has led to different considerations about some important parameters of the systems: heat conductivity of the ground around the pipe; installation depth; type of application. The results of the CFD simulations and of the economic calculations have produced the following considerations: it is recommended to increase the performance of the system with a filler with a higher heat conductivity in case the soil has only1.0 W /(m K) of heat conductivity, but it is worthless to do the same when the heat conductivity is higher than 2.0 W/(m K); the difference is transferred heat is higher from 1.5 m to 2.0 m than from 2.0 m to 2.5 m of installation depth.
The installation depth has some economic advantages even if the installation costs increase with the depth. On the other hand the obtainable energy savings justify a deeper installation of the pipes for an intensive use of the system during the year.

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