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Performance analysis of short helical borehole heat exchangers via integrated modelling of a borefield and a heat pump: A case study

pubblicazioni - Articolo

Performance analysis of short helical borehole heat exchangers via integrated modelling of a borefield and a heat pump: A case study

Questo paper studia sonde geotermiche elicoidali associate a pompe di calore geotermiche. Viene svolto un confronto tra questa configurazione e quella a doppia U, più comunemente adottata.

In this paper the short vertical ground heat exchanger with a helical shaped pipe is investigated. By virtue of lower installation costs, this type of configuration could be a suitable alternative to conventional U-shaped tubes, especially when the heating and cooling loads of the building are very low as for net-zero-energy homes. This work is aimed to compare the two configurations (helical and U-shaped tubes) for a residential application by means of a numerical simulation tool that uses a network of interconnected thermal resistances and capacitances to consider the heat transfer. The model is able to take into account the interaction between the ground and the ambient environment which affects the fluid heat carrier temperature into the heat exchanger and, as a consequence, the energy efficiency of the heat pump; furthermore, in a previous study it was also verified by measurements from a test.

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