A novel method for full-scale measurement of the external convective heat transfer coefficient for building horizontal roof
Shao, J., Liu, J., Zhao, J., Zhang, W., Sun, D. and Fu, Z.
2009 Energy and Buildings, 41(8): 840-847
External convective heat transfer coefficient; Field measurement; Naphthalene sublimation method; Heat balance method
Shao, J., Liu, J., Zhao, J., Zhang, W., Sun, D. and Fu, Z., (2009), "A novel method for full-scale measurement of the external convective heat transfer coefficient for building horizontal roof", Energy and Buildings, 41(8): 840-847.
Abstract:
The external convective heat transfer coefficient (CHTC) of building horizontal roof is an indispensable parameter for accurately calculating heat transfer through the roof and simulating airflow around the building. A novel method, namely naphthalene sublimation method, was developed for measuring external CHTC and was compared with heat balance method in this study. The comparative field measurements were carried out on the roof of a nine-story building using both methods simultaneously. The measured CHTCs on the roof of building show an approximate linear relation with representative wind velocities. The magnitude of results using the two methods was very close to each other, though the slope of the linear function using the naphthalene sublimation method was a little larger than that using the heat balance method. The difference can be considered as the slow response of heat flux meter used in heat balance method. In addition, the variance of temperature on test specimen's surfaces was not found to have significant effect on measurement results.
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Liu, J. School of Municipal and Environmental Engineering, Harbin Institute of Technology, P.O. Box 2651, 202 Haihe Street, Nangang District, Harbin 150090, China
