BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

76 Bogdan Horbaniuc et al
Fig. 8 – The amounts of extracted and of remaining heat in the SSM
versus time during discharging.
For this reason, we have chosen to represent in a bar plot the amounts of
heat that has been extracted from the SSM until the considered moment,
respectively the amount of heat that remains stored in the system at that
moment. At the end of the process, 22,575.07 kJ of heat still remained stored in
the ground, whereas an amount of 11,173.76 kJ of heat had been extracted.
4. Conclusions
1. The single tube borehole configuration of a thermal energy storage
system may represent a serious candidate for a daily-basis solar energy thermal
storage.
2. A mathematical model and the numerical treatment based on the finite
differences approach have been applied to an example and the temperature field
as well as the stored/extracted heat have been determined in order to analyze the
process dynamics.
3. The example studied in this paper shows that the mathematical model
and the finite difference approach that have been developed work well for a
single tube borehole thermal energy storage and thus a more refined model and
numerical treatment can be further developed.
REFERENCES
Arya P., Introduction to Micrometeorology. Academic Press, London, 2001.
Croft D. R., Lilley D. L., Heat Transfer Calculations Using Finite Difference
Equations. Applied Science Publishers Ltd., London, 1977.