Heat Transfer Coefficients and Dynamical Thermal Models for Variable Flow Rates in Pipes and Ducts

Bjørn R Sørensen

doi:10.4028/www.scientific.net/AMM.291-294.1760

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The Research of Indoor Thermal Comfort under Dynamic Conditions
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Computational Simulation and Experimental Research of Heating System for a Field Shower Equipment
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Heat Transfer Coefficients and Dynamical Thermal Models for Variable Flow Rates in Pipes and Ducts
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Study of Economic Specific Frictional Resistance in Hot Water Heat Supply Net Work in Xi’an
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Integration of Multiple In-House Heat Stations into One Energy Flexible Heat System
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LCCP Evaluation on Environmental Impact of Air-Conditioning Cold and Heat Source
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The Air Conditioning System of a Large Public Building Energy Consumption Simulation Research
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 291-294Heat Transfer Coefficients and Dynamical Thermal...

Heat Transfer Coefficients and Dynamical Thermal Models for Variable Flow Rates in Pipes and Ducts

Abstract:

This study presents thermal models of pipes or ventilation ducts with variable flow rates. The models are based on dynamic thermodynamic heat balances, and much attention has been put into developing accurate heat transfer coefficients. MATLAB/Simulink environment has been used for modeling, but the model is however universal and can be implemented into any software. The model has been validated against measurement data, and found to be quite accurate for use in typical HVAC applications. Accuracy is particularly good if taking thermal damping into account. Thermal damping of pipe or duct mass has shown to be significant for dynamic performance. The model is suited for control simulations or accurate heat loss simulations, where dynamic conditions are important.

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Periodical:

Applied Mechanics and Materials (Volumes 291-294)

Pages:

1760-1771

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.291-294.1760

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Online since:

February 2013

Authors:

Bjørn R Sørensen

Keywords:

Ducts, Heat Transfer Coefficient (HTC), HVAC, Modeling, Pipes

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References

[1] Y. A. Cengel: Introduction to Thermodynamics and Heat Transfer. McGraw-Hill, ISBN 0-07-011498-6 (1997).

Google Scholar

[2] F. P. Incropera, D. P. De Witt: Fundamentals of Heat and Mass Transfer. Wiley (1990).

Google Scholar

[3] P. E. Blomberg: Experimental validation of dynamic component models for simulation of air handling units. Bulletin 50, KTH (the Royal Institute of Technology), Sweden (1999).

Google Scholar

[4] B. R. Sørensen: Applications and Energy Consumption of Demand controlled Ventilation Systems. Modelling, Simulation and Implementation of Modular Built Dynamical VAV Systems and Control Strategies. Doktor ingeniøravhandling 2002: 54, ISBN 82-471-5428-5, NTNU, Tapir Norway (2002).

Google Scholar