Abstract
Ground-source heat pump (GSHP) systems represent one of the most promising
techniques for heating and cooling in buildings. These systems use the ground
as a heat source/sink, allowing a better efficiency thanks to the low variations
of the ground temperature along the seasons. The ground-source heat exchanger
(GSHE) then becomes a key component for optimizing the overall performance of
the system. Moreover, the short-term response related to the dynamic behaviour
of the GSHE is a crucial aspect, especially from a regulation criteria
perspective in on/off controlled GSHP systems. In this context, a novel
numerical GSHE model has been developed at the Instituto de Ingeniería
Energética, Universitat Politècnica de València. Based on the decoupling of the
short-term and the long-term response of the GSHE, the novel model allows the
use of faster and more precise models on both sides. In particular, the shortterm
model considered is the B2G model, developed and validated in previous
research works conducted at the Instituto de Ingeniería Energética. For the longterm,
the g-function model was selected, since it is a previously validated and
widely used model, and presents some interesting features that are useful for
its combination with the B2G model. The aim of the present paper is to
describe the procedure of combining these two models in order to obtain a
unique complete GSHE model for both short- and long-term simulation. The
resulting model is then validated against experimental data from a real GSHP
installation.
