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Additional resources for Ventilation of Buildings
E. the people were only dissatisﬁed with the radiant asymmetry. The effect of radiant temperature asymmetry, tpr , on the percentage of dissatisﬁed due to a general warm or cold sensation is shown in these two ﬁgures for the heated ceiling and cold window respectively. It may be concluded from this study that people are more sensitive to asymmetric radiation caused by a warm ceiling than by a cold vertical surface. The inﬂuence of a cold ceiling and a warm wall was also studied but people were found to be less sensitive to these forms of radiant asymmetry.
5. McIntyre, D. A. (1980) Indoor Climate, Applied Science Publishers, Barking. 6. ISO 7730 (1994) Moderate thermal environments – determination of the PMV and PPD indices and speciﬁcation of the conditions for thermal comfort, 2nd edn, International Standards Organisation, Geneva. 7. CIBSE Guide C – Reference Data(2001) Section C1: Properties of humid air, Chartered Institution of Building Services Engineers, London. 8. , Gonzalez, R. R. and Gagge, A. P. (1975) Direct measurement of clothing heat transfer properties during sensible and insensible heat exchange with thermal environment.
The small velocity ﬂuctuations close to the ﬂoor in the case of the ﬂoor heating system are due to the downdraught over the ﬂoor from a window. The higher ﬂuctuations in the radiator-heated room are caused by the interaction of convective currents produced by the radiator with downdraught from a window, since the signal was measured close to the window. Except for the difference in the turbulence intensity (TI) between the two signals the mean velocity is almost the same. Measurements of air velocities in 12 mechanically ventilated buildings with air change rates of 4 and 8 per h are reported in .