Dutt, A J
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Publication Full scale and model investigation of natural ventilation and thermal comfort in a building(1992) Dutt, A.J.; de Dear, R.J.; Krishnan, P.; SCHOOL OF BUILDING & REAL ESTATE; GEOGRAPHYApplication of a new experimental technique for the investigation of natural ventilation and thermal comfort in a building situated in Singapore is described. The investigation comprised full scale experiments in a naturally ventilated dining room of a students' hall of residence and scale model tests of the building in a boundary layer wind tunnel. There was good agreement of results obtained from full scale tests and model tests. Thermal comfort analyses were based on a "tropicalized" PMV index as applied to mean conditions observed in the full scale experiments. © 1992.Publication Effects of wind flow on freshly poured concrete(1992) Dutt, A.J.; Roy, S.K.; Chew, M.Y.L.; SCHOOL OF BUILDING & REAL ESTATEShrinkage is a more important parameter than drying rate to determine whether cracking of a concrete member will occur in a given condition. For a given drying rate concrete of a particular grade may crack but a concrete of a better grade may not. However, if the drying stress (governed by shrinkage) exceeds the strength of the body at a given instant, cracking occurs. Results of shrinkage study for different wind speeds are given. Good experimental backup has been provided in this study to the theoretical prediction of the previous work [1, 2] regarding concrete plastic shrinkage cracking. A general trend was observed in that as the wind speed increases, the shrinkage also increases. The study also observed that shrinkage is also very sensitive to the temperature of concrete. Plastic shrinkage could become a significant problem even at a low wind speed if the concrete temperature exceeds 50°C. © 1992.