Damien Picard
KU Leuven, Department of Mechanical Engineering, Division of Applied Mechanics and Energy Conversion, Heverlee, Belgium
Lieve Helsen
KU Leuven, Department of Mechanical Engineering, Division of Applied Mechanics and Energy Conversion, Heverlee, Belgium
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http://dx.doi.org/10.3384/ecp14096857Published in: Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden
Linköping Electronic Conference Proceedings 96:89, p. 857-866
Published: 2014-03-10
ISBN: 978-91-7519-380-9
ISSN: 1650-3686 (print), 1650-3740 (online)
Accurate and computationally efficient borefield models are important components in building energy simulation programs. They have not been implemented in Modelica so far. This paper describes the implementation of an innovative approach to model borefields with arbitrary configuration having both shortterm (minutes) and long-term accuracy (decades) into Modelica. A step response is calculated using a combination of a short-term response model which takes into account the transient heat transfer in the heat carrier fluid; the grout and the immediately surrounding ground; and a long-term response model which calculates the boreholes interactions. Moreover; an aggregation method is implemented to speed up the calculations. Validation shows good results and very high computational efficiency.
[1] EnergyPlus, Getting started with EnergyPlus.
[2] TRNSYS 17, a transient system simulation program.
[3] D. Bauer, W. Heidemann, H. Müller-Steinhagen, and H.-J. G. Diersch. Thermal resistance and capacity models for borehole heat exchangers. internal journal of energy research, 35:312–320, 2010.
[4] R. A. Beier. Transient heat transfer in a u-tube borehole heat exchanger. paper accepted for publication in Applied Thermal Engineering, 19-09-2013.
[5] R. A. Beier, M. D. Smith, and J. D. Spilter. Reference data sets for vertical borehole ground heat exchanger models and thermal response test analysis. Geothermics, 40:79–85, 2011.
[6] S. Bertagnolio, M. Bernier, and M. Kummert. Comparing vertical ground heat exchanger models. Building Performance Simulation, 1:1–15, 2012.
[7] H. S. Carslaw and J. C. Jaeger. Conduction of Heat in Solids. Oxford University Press, UK, 1959.
[8] J. Claesson and S. Javed. A load-aggregation method to calculate extraction temperatures of borehole heat exchangers. ASHRAE Transactions, 118, Part 1, 2012.
[9] P. Eskilson. Thermal analysis of heat extraction boreholes. PhD thesis, Dep. of Mathematical Physics, University of Lund, Sweden, 1987.
[10] G. Hellström. Ground heat storage: thermal analyses of duct storage systems (Theory). Dep. of Mathematical Physics, University of Lund, Sweden, 1991.
[11] K Huchtemann and D. Müller. Advanced simulation methods for heat pump systems. Proceedings 7th Modelica Conference, Como, Italy, 2009.
[12] S. Javed. Thermal modelling and evaluation of borehole heat transfer. PhD thesis, Dep. Energy and Environment, Chalmers University of Technology, Göteborg, Sweden, 2012.
[13] L. Lamarche, S. Kajl, and B. Beauchamp. A review of methods to evaluate borehole thermal rresistance in geothermal heat-pump systems. Geothermics, 39:187–200, 2010.
[14] V. Malayappan and J.D. Spitler. Limitations of using uniform heat flux assumptions in sizing vertical borehole heat exchanger fields. In Proceedings of Clima, June 16-19. Prague, 2013.
[15] Haruhiko Okumura. New Algorithm handbook in C language. Gijyutsu hyouron sha, Tokyo, p227, 1991.
[16] T. Schmidt and G. Hellström. Superposition borehole model, working paper on usable tools and methods. Technical report, Nordon, nordic energy research, February 2005.
[17] M. Wetter and A. Huber. Trnsys type451, vertical borehole heat exchanger, ews model, version 3.1, model description and implementating into trnsys. Technical report, TranssolarGmbH, Stuttgart , Germany., 1997.
[18] M. Wetter, W. Zuo, T. Nouidui, and X. Pang. Modelica buildings library. Journal of Building Performance Simulation, 0:1–18, 2013.
