GROUND HEAT TRANSFER DURING HEAT REMOVAL BY A SINGLE BOREHOLE HEAT EXCHANGER

Autor/autori: Andrei DUMENCU, *Bogdan HORBANIUC, Gheorghe DUMITRA┼×CU p 8-13


Abstract: Ground-source heat pumps represent a solution to use the heat removed from the ground in order to heat residential or social buildings, thus reducing the greenhouse gases resulted from fossil fuel burning. When there are surface area constraints, borehole heat exchangers are used to extract heat from the ground. During the heat removal operation, the ground temperature decreases and the perturbation propagates radially around the borehole. It is important to assess the magnitude of this perturbation and to determine the heat removed. The paper deals with the calculation of the temperature distribution at different moments (1, 3, and 6 months), by using the decomposition finite difference technique. The model, at this stage a one-dimension one, is also used to prepare the next stage, which will consider two-dimension heat propagation due to the heat exchange at the ground surface in contact with air.

Keywords: ground-source heat pumps, borehole heat exchanger, finite difference, decomposition technique, cylindrical geometry

 

DOWNLOAD PDF