A Numerical Procedure for Modelling the Thermal Performance of Ventilated Hollow Core Slabs


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This paper presents a numerical procedure for modelling the thermal performance of ventilated hollow core slabs (VHCS). A turbulence model suitable for this purpose is identified first by considering a smooth horizontal pipe subjected to turbulent mixed convention conditions typical of VHCSs. Comparison of the fully-developed dimensionless velocity (u+) and temperature (T+) profiles as well as the Nusselt numbers (Nu) predicted by five different turbulence models against empirical expressions available in the literature shows that the Standard and Realisable k-ε models provide the best overall predictions of u+, T+ and Nu. Since the Standard k-ε model gives slightly better estimates of the Nu values, it is adopted to model the thermal performance of a VHCS geometry for which experimental thermal responses are reported in the literature. The numerical predictions of local temperatures within the VHCS agree well with the experimental measurements, and hence the Standard k-ε model is recommended here for the modeling of VHCSs.



Edited by:

Yuantong Gu, Hong Guan, Emilie Sauret, Suvash Saha, Haifei Zhan, Rodney Persky




A. Faheem et al., "A Numerical Procedure for Modelling the Thermal Performance of Ventilated Hollow Core Slabs", Applied Mechanics and Materials, Vol. 846, pp. 12-17, 2016

Online since:

July 2016




* - Corresponding Author

[1] Ren, M. J., & Wright, J. A. (1998). A Ventilated Slab Thermal Storage System Model. Building and Environment, 33(1), 43-52.

DOI: 10.1016/s0360-1323(97)00030-9

[2] BS EN ISO 6946. (2007). Building components and building elements - Thermal resistance and thermal transmittance - Calculation method. UK: British Standards Institution Limited.

DOI: 10.3403/00942964u

[3] Barnard, N. (1994). Dynamic Energy Storage in the Building Fabric, Building Services Research and Information Association (BSRIA), Bracknell, UK, p.28.

[4] ANSYS. (2011). Ansys Fluent Theory Guide (Vol. 14). Canonsburg, PA: ANSYS Incorporated.

[5] Faheem, A., Ranzi, G., Fiorito, F., & Lei, C. (2016). A numerical study of turbulent mixed convection in a smooth horizontal pipe. Journal of Heat Transfer, 138(1). doi: 10. 1115/1. 4031112.

DOI: 10.1115/1.4031112

[6] Coles, D. (1956). The law of the wake in the turbulent boundary layer. Journal of Fluid Mechanics, 1(2), 191-226.

[7] Petukhov, B. S., & Polyakov, A. F. (1988). Heat Transfer in Turbulent Mixed Convection: Hemisphere Publishing Corporation.

[8] Kader, B. A. (1981). Temperature and Concentration profiles in fully turbulent Boundary layers. International Journal of Heat and Mass Transfer, 24(9), 1541-1544.

DOI: 10.1016/0017-9310(81)90220-9

[9] Boelter, L. M. K., Cherry, V. H., Johnson, H. A., & Martinelli, R. C. (1965). Heat Transfer Notes. New York: McGraw-Hill Book Company.

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