Abstract
The design and optimization of ground source heat pump systems require the ability to accurately reproduce the dynamic thermal behavior of the system on a short-term basis, specially in a system control perspective. In this context, modeling borehole heat exchangers (BHEs) is one of the most relevant and difficult tasks. Developing a model that is able to accurately reproduce the instantaneous response of a BHE while keeping a good agreement on a long-term basis is not straightforward. Thus, decoupling the short-term and long-term behavior will ease the design of a fast short-term focused model. This work presents a short-term BHE dynamic model, called Borehole-to-Ground (B2G), which is based on the thermal network approach, combined with a vertical discretization of the borehole.The proposed model has been validated against experimental data from a real borehole located in Stockholm, Sweden. Validation results prove the ability of the model to reproduce the short-term behavior of the borehole with an accurate prediction of the outlet fluid temperature, as well as the internal temperature profile along the U-tube.
Original language | English |
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Pages (from-to) | 210-223 |
Number of pages | 14 |
Journal | Applied Energy |
Volume | 140 |
Early online date | 18 Dec 2014 |
DOIs | |
Publication status | Published - 15 Feb 2015 |
Externally published | Yes |
Keywords
- Borehole heat exchanger
- Dynamic modeling
- Ground source heat pump
- Heating and cooling systems
ASJC Scopus subject areas
- General Energy
- Civil and Structural Engineering