Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Simple Modeling of Floor Heating Systems based on Optimal Parameter Settings

최적 파라미터를 이용한 단순 모델 기반 바닥 난방 시스템 모델링

  • Park, Seung Hoon (Department of Architectural Engineering, INHA University Graduation School) ;
  • Jang, Yong Sung (GS E&C Building Science Research Team) ;
  • Kim, Eui-Jong (Department of Architectural Engineering, INHA University)
  • Received : 2017.07.25
  • Accepted : 2017.08.29
  • Published : 2017.09.10
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Abstract

Radiant floor heating systems have been used as common heating supply systems in most residential buildings in Korea. Since the system uses a floor as thermal storage, proper control strategy should be adopted to avoid over-or under-heating problems. So far, studies related to control of the floor heating system have been conducted based on computer simulations. The active layer in TRNSYS is known for its usability as a floor heating system model and is integrated with the TRNSYS building model (Type 56). However, floor heating system simulations with the active layer are operated only if pre-defined minimum mass flow rate is ensured. This study proposes a simple RC (Resistance-Capacitance) model for radiant floor heating systems. Model parameters such as Rs and Cs are defined by optimization. The active layer, in this study, is used as the target system to search for optimal values. A TRNOPT optimization tool was used to conduct optimization under given simulation conditions. The RC model with optimal parameters are tested in other mass flow rates that were not used during optimization. Results reveal the RC model describes the active layer with successfully optimized model parameters. The RC model has fewer model limitations, and is expected to be used for various target systems, e.g. experimental data of a real radiant heating system.

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References

  1. Braun, J. E., Montgomery, K. W., and Chaturvedi, N., 2001, Evaluating the performance of building thermal mass control strategies, HVAC&R Research, Vol. 7, No. 4, pp. 403-428. https://doi.org/10.1080/10789669.2001.10391283
  2. Hong, H. K., 2014, Korean traditional heating ondol and modernization, Magazine of the SAREK, Vol. 43, No. 1, pp. 62-70.
  3. Lim, J. H., Jo, J. H., Kim, Y. Y., Yeo, M. S., and Kim, K. W., 2006, Application of the control methods for radiant floor cooling system in residential buildings, Building and Environment, Vol. 41, No. 1, pp. 60-73. https://doi.org/10.1016/j.buildenv.2005.01.019
  4. Chen, T. Y., 2002, Application of adaptive predictive control to a floor heating system with a large thermal lag, Energy and Buildings, Vol. 34, No. 1, pp. 45-51. https://doi.org/10.1016/S0378-7788(01)00076-7
  5. Rhee, K. N., Ryu, S. R., Yeo, M. S., and Kim, K. W., 2010, Simulation study on hydronic balancing to improve individual room control for radiant floor heating system, Building Services Engineering Research and Technology, Vol. 31, No. 1, pp. 57-73. https://doi.org/10.1177/0143624409354140
  6. Jin, W. F., Rhie, M. K., Yeo, M. S., and Kim, K. W., 2004, A study on the individual room control of radiant floor heating system in apartment buildings, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 16, No. 5, pp. 421-429.
  7. University of Wisconsin-Madison. Solar Energy Laboratory, and Klein, S. A., 1979, TRNSYS, a transient system simulation program, Solar Energy Laborataory, University of Wisconsin-Madison.
  8. Cho, S. H. and Zaheer-Uddin, M., 2003, Predictive control of intermittently operated radiant floor heating systems, Energy Conversion and Management, Vol. 44, No. 8, pp. 1333-1342. https://doi.org/10.1016/S0196-8904(02)00116-4
  9. Weitzmann, P., Kragh, J., Roots, P., and Svendsen, S., 2005, Modelling floor heating systems using a validated two-dimensional ground-coupled numerical model, Building and Environment, Vol. 40, No. 2, pp. 153-163. https://doi.org/10.1016/j.buildenv.2004.07.010
  10. Ibanez, M., Lázaro, A., Zalba, B., and Cabeza, L. F., 2005, An approach to the simulation of PCMs in building applications using TRNSYS, Applied Thermal Engineering, Vol. 25, No. 11, pp. 1796-1807. https://doi.org/10.1016/j.applthermaleng.2004.11.001
  11. Song, D., Kim, T., Song, S., Hwang, S., and Leigh, S. B., 2008, Performance evaluation of a radiant floor cooling system integrated with dehumidified ventilation, Applied Thermal Engineering, Vol. 28, No. 11, pp. 1299-1311. https://doi.org/10.1016/j.applthermaleng.2007.10.020
  12. Memon, R. A., Chirarattananon, S., and Vangtook, P., 2008, Thermal comfort assessment and application of radiant cooling : a case study, Building and environment, Vol. 43, No. 7, pp. 1185-1196. https://doi.org/10.1016/j.buildenv.2006.04.025
  13. Mazo, J., Delgado, M., Marin, J. M., and Zalba, B., 2012, Modeling a radiant floor system with Phase Change Material (PCM) integrated into a building simulation tool : Analysis of a case study of a floor heating system coupled to a heat pump, Energy and Buildings, Vol. 47, pp. 458-466. https://doi.org/10.1016/j.enbuild.2011.12.022
  14. Laouadi, A., 2004, Development of a radiant heating and cooling model for building energy simulation software, Building and Environment, Vol. 39, No. 4, pp. 421-431. https://doi.org/10.1016/j.buildenv.2003.09.016
  15. Hong, H. K. and Kim, S. H., 2010, Method and analysis of dynamic simulation for Ondol heating, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 22, No. 6, pp. 375-382.
  16. Yeo, M. S., Seok, H. T., and Kim, K. W., 1998, A study on the Water Temperature Control Method of Hydronic Radiant Floor Heating System in Apartment Buildings, JOURNAL-ARCHITECTURAL INSTITUTE OF KOREA PLANNING AND DESIGN, Vol. 14, pp. 203-210.
  17. Choi, J. M., Lee, K. N., Ryu, S. R., Kim, Y. Y., Yeo, M. S., and Kim, K. W., 2007, A study on the required supply water temperature calculating method for the control of multizone radiant floor heating system, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 19, No. 1, pp. 77-85.
  18. SEL, T. and CSTB, T., 2004, Multizone Building modeling with Type56 and TRNBuild.
  19. Shin, U. C., Jang, M. S., Yoo, H. H., and Min, J. H., 2002, Characteristics of heat transfer in the apartment with ondol heating system, In Proceeding of Annual Conference in AIK, Vol. 18, No. 1, pp. 179-185.
  20. EN ISO, 13790 : 2008, Energy performance of buildings-Calculation of energy use for space heating and cooling, pp. 24-26.
  21. Nise, Norman S., 2010, Control Systems Engineering (6th ed.). John Wiley & Sons, Inc.
  22. Verhaegen, M., and Dewilde, P., 1992, Subspace model identification part 2. Analysis of the elementary output-error state-space model identification algorithm. International journal of control, Vol. 56, No. 5, pp. 1211-1241. https://doi.org/10.1080/00207179208934364
  23. Wetter, M., 2009, Generic Optimization Program User Manual Version 3.1.1., Lawrence Berkeley National Laboratory.
  24. Park, S. H., Lee, H. S., Jang, Y. S., and Kim, E. J., 2016, Sizing of Vertical Borehole Heat Exchangers using TRNOPT, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 28, No. 10, pp. 402-407. https://doi.org/10.6110/KJACR.2016.28.10.402