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Air velocities due to natural draught caused by the indoor hot and outdoor cold temperature difference
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The air velocity caused by the forces created by the difference in density of cold and warm air, can be expressed as
v = 4.43 ( h (th - to )/ (273 + to) )1/2 (1)
where
v = theoretical velocity (m/s)
h = height of air column (m)
th = temperature hot air column (oC)
to = outside temperature (oC)
The velocities in columns of different heights and at different hot temperatures are shown in the table below. The calculations are made for an outside temperature to = 0oC.
| Velocity of Air - v - (m/s) | ||||||
| Height
of Column
- h - (m) |
Temperature of Hot Column - th - (oC) | |||||
| .4. | .8. | .16. | .32. | .64. | .128. | |
| .0.2. | .0.24. | .0.34. | .0.48. | .0.68. | .0.96. | .1.36. |
| .0.4. | .0.34. | .0.48. | .0.68. | .0.96. | .1.36. | .1.92. |
| .0.8. | .0.48. | .0.68. | .0.96. | .1.36. | .1.92. | .2.71. |
| .1.6. | .0.68. | .0.96. | .1.36. | .1.92. | .2.71. | .3.84. |
| .3.2. | .0.96. | .1.36. | .1.92. | .2.71. | .3.84. | .5.43. |
| .6.4. | .1.36. | .1.92. | .2.71. | .3.84. | .5.43. | .7.67. |
| .12.8. | .1.92. | .2.71. | .3.84. | .5.43. | .7.67. | .10.85. |
| .25.6. | .2.71. | .3.84. | .5.43. | .7.67. | .10.85. | .15.35. |
| .51.2. | .3.84. | .5.43. | .7.67. | .10.85. | .15.35. | .21.71. |
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