Ventilation of Buildings by Hazim Awbi,Ebooks Corporation.

By Hazim Awbi,Ebooks Corporation.

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By Hazim Awbi,Ebooks Corporation.

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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 [37].

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