NOTE: In this psychrometric chart the abscissa is the dry-bulb temperature, and the mean radiant temperature (MRT) is fixed, controlled by the inputbox. Each point on the chart has the same MRT, which defines the comfort zone boundary. In this way you can see how changes in MRT affect thermal comfort. You can also still use the operative temperature button, yet each point will have the same MRT.

The CBE comfort tools automatically calculates the relative air speed but does not calculates the dynamic insulation characteristics of clothing as specified in the ISO 7730 Section C.2., hence this value should be calculated by the user and entered as input in the CBE comfort tool.

NOTE: In this psychrometric chart the abscissa is the operative temperature and for each point dry-bulb temperature equals mean radiant temperature (DBT = MRT). The comfort zone represents the combination of conditions with the same DBT and MRT for which the PMV is between -0.5 and +0.5, according to the standard.

The CBE comfort tools automatically calculates the relative air speed but does not calculates the dynamic insulation characteristics of clothing as specified in the ISO 7730 Section C.2., hence this value should be calculated by the user and entered as input in the CBE comfort tool.

NOTE: This chart represents only two variables, dry-bulb temperature and relative humidity. The PMV calculations are still based on all the psychrometric variables, but the visualization becomes easier to understand.

The CBE comfort tools automatically calculates the relative air speed but does not calculates the dynamic insulation characteristics of clothing as specified in the ISO 7730 Section C.2., hence this value should be calculated by the user and entered as input in the CBE comfort tool.