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CLC number: TU83

On-line Access: 2011-06-07

Received: 2010-08-01

Revision Accepted: 2010-12-19

Crosschecked: 2011-03-29

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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.6 P.428-437

http://doi.org/10.1631/jzus.A1000358


Improved thermal performance of a hydronic radiant panel heating system by the optimization of tube shapes


Author(s):  Young T. Chae, Kwang Ho Lee, Jae Sung Park

Affiliation(s):  School of Architecture, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA, Department of Architectural Engineering, Hanbat National University, Daejeon 305-719, South Korea, Department of Mechanical Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

Corresponding email(s):   kwhlee@hanbat.ac.kr

Key Words:  Radiant panel system, Analytical modeling, Computational fluid dynamics (CFD), Tube shape, Energy saving


Young T. Chae, Kwang Ho Lee, Jae Sung Park. Improved thermal performance of a hydronic radiant panel heating system by the optimization of tube shapes[J]. Journal of Zhejiang University Science A, 2011, 12(6): 428-437.

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DOI - 10.1631/jzus.A1000358


Abstract: 
The thermal performance enhancement of the hydronic radiant floor heating system by tube shape refinements is investigated in this paper. Both analytical and detailed numerical modelings are carried out to predict the performance of the radiant system. While the simple analytical model briefly investigates the possibility of the effect of the tube shape improvement with the parametric analysis, the commercial computational fluid dynamics (CFD) code (Ansys/CFX) is used to perform the detailed 3D analysis under different tube shape conditions. The fin thickness, the number of fins, and the tube thermal conductivity turn out to have significant effects on the radiant system performance. The potential energy saving impacts of the tube shape refinements are also discussed. The tube shape improvement turns out to increase the floor surface temperature and to decrease the hot water temperature drop across the system, resulting in heating energy savings.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]Ahn, B.C., Sone, J.Y., Lee, T.W., Kim, Y.K., 2006. Simulation and Experimental Study for Energy Flow Dynamics for Floor Radiant Heating System. Proceedings of the Society of Air-Conditioning and Refrigerating Engineers of Korea (SAREK) Summer Annual Conference, Korea.

[2]ASHRAE, 2000. Handbook of Systems and Equipment. American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc. (ASHRAE), Atlanta, USA.

[3]Bozkir, O., Canbazoglu, S., 2004. Unsteady thermal performance analysis of a room with serial and parallel duct radiant floor heating system using hot airflow. Energy and Buildings, 36(6):579-586.

[4]Chen, T.Y., 2002. Application of adaptive predictive control to a floor heating system with a large thermal lag. Energy and Buildings, 34(1):45-51.

[5]Cho, S.H., Zaheer-Uddin, M., 1999. An experimental study of multiple parameter switching control for radiant floor heating systems. Energy, 24(5):433-444.

[6]Incropera, F.P., Dewitt, D.P., Bergman, T.L., Lavine, A.S., 2006. Fundamental of Heat and Mass Transfer (6th Ed.). John Wiley & Sons Inc., Hoboken, USA.

[7]Kilkis, B., Eltez, M., Sager, S., 1995. A simplified model for the design of radiant in-slab heating panels. ASHRAE Transactions, 99(2):210-216.

[8]Laouadi, A., 2004. Development of a radiant heating and cooling model for building energy simulation software. Building and Environment, 39(4):421-431.

[9]Sattari, S., Farhanieh, B., 2006. A parametric study on radiant floor heating system performance. Renewable Energy, 31(10):1617-1626.

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