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Abstract

Improved data correlations have been derived for buoyancy-driven convective heat transfer from the internal surfaces of naturally-ventilated buildings. They cover the full range of laminar, transitional and turbulent airflows, and are based on the mathematical model of Churchill & Usagi (1972). The new correlating equations are presented in a convenient form for incorporating into modern computer programs which simulate the dynamic thermal performance of buildings. They compare favourably with the available exerimental data for isolated surfaces, and are shown to be an improvement on the ‘standard’ correlations recommended in the CIBS Guide. The factors which affect the accuracy of such data correlations, when used for the energy-conscious design of ‘real’ buildings, are briefly discussed.

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References

1. Clarke, J. A. , Computer applications in the design of energy-conscious buildings, Computer-aided Design, 14, 3–9 (1982).

2. Day, B. , Computation of the dynamic thermal performance of buildings, Computer-aided Design, 14, 49–54 (1982).

3. Irving, S. J. , Energy program validation: conclusions of IEA Annex 1, Computer-aided Design, 14, 33–38 (1982).

4. CIBS Guide, C3: Heat Transfer (CIBS, London, 1976).

5. Alamdari, F. & Hammond, G. P. , Time-dependent convective heat transfer in warm-air heated rooms, Proc. 3rd Int. Symp. Energy Conservation in the Built Environment, 4, 209–220 (CIB/An Foras Forbartha, Dublin, 1982).

6. Churchill, S. W. & Usagi, R. , A general expression for the correlation of rates of transfer and other phenomena, AIChE Journal, 18, 1121–1128 (1972).

7. Mayhew, Y. R. & Rogers, G. F. C. , Thermodynamic and Transport Properties of Fluids: SI Units (Blackwell, Oxford, Second Edition, 1969).

8. Griffiths, E. & Davis, A. H., The transmission of heat by radiation and convection, DSIR Food Investigation Board Special Report No. 9 (HMSO, London, 1922).

9. Saunders, O. A. , The effect of pressure upon natural convection in air, Proc. Roy. Soc, A157, 278–291 (1936).

10.

10. Warner, C. Y. & Arpaci, V. S. , An experimental investigation of turbulent natural convection in air at low pressure along a vertical heated flat plate, Int. J. Heat Mass Transfer, 11, 397–406 (1968).

11.

11. Churchill, S. W. & Chu, H. H. S. , Correlating equations for laminar and turbulent free convection from a vertical plate, Int. J. Heat Mass Transfer, 18, 1323–1329 (1975).

12.

12. ESDU Data Item No. 77031, Heat transfer by free convection and radiation–-simply shaped bodies in air and other fluids (ESDU, London, 1979).

13.

13. Al-Arabi, M. & El-Riedy, M. K. , Natural convection heat transfer from isothermal horizontal plates of different shapes, Int. J. Heat Mass Transfer, 19, 1399–1404 (1976).

14.

14. Saunders, O. A. , Fishenden, M. & Mansion, H. D. , Some measurements of convection by an optical method, Engineering, 483–485 (May 1935).

15.

15. Yousef, W. W. , Tarasuk, J. D. & McKeen, W. J. , Free convection heat transfer from upward-facing isothermal horizontal surfaces, ASME J. Heat Transfer, 104, 493–500 (1982).

16.

16. Fujii, T. & Imura, H. , Natural-convection heat transfer from a plate with arbitrary inclination, Int. J. Heat Mass Transfer, 15, 755–767 (1972).

17.

17. Singh, S. N. , Birkebak, R. C. & Drake, R. M. , Laminar free convection heat transfer from downward-facing horizontal surfaces of finite dimensions, Prog. Heat Mass Transfer, 2, 87–98 (1969).

18.

18. Aihara, T. , Yamada, T. & Endo, S. , Free convection along the downward-facing surface of a heated horizontal plate, Int. J. Heat Mass Transfer, 15, 2535–2549 (1972).

19.

19. Restrepo F. & Glicksman, L. R. , The effect of edge conditions on natural convection from a horizontal plate, Int. J. Heat Mass Transfer, 17, 135–142 (1974).

20.

20. Yaneske, P. P. & Forrest, I. D. , The thermal response of rooms with intermittent, forced convective heating, Build. Serv. Eng., 46, 13–17 (1978).

21.

21. Waters, J. R. , The experimental verification of a computerised thermal model for buildings, BSER&T, 1, 76–82 (1980).

Improved data correlations for buoyancy-driven convection in rooms

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