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A Venn diagram of Comfort zone outside of which the optimal performance zone is present. Danger zone is marked in red. A comfort zone is a familiar psychological state where people are at ease and (perceive they are) in control of their environment, experiencing low levels of anxiety and stress.
The representation is made on a temperature-relative humidity, instead of a standard psychrometric chart. The comfort zone in blue represents the 90% of acceptability, which means the conditions between -0.5 and +0.5 PMV, or PPD < 10%.
The graphic comfort zone model is limited in applicability to conditions when the metabolic rate of occupants is 1.0-1.3 met and the humidity ratio is below 0.012 kg H 2 O/kg dry air (0.012 lb H 2 O/lb dry air). If these requirements are met and the environmental conditions inside the building fall within the indicated ranges, then compliance ...
The CBE Thermal Comfort Tool for ASHRAE 55 [9] allows users to input the six comfort parameters to determine whether a certain combination complies with ASHRAE 55. The results are displayed on a psychrometric or a temperature-relative humidity chart and indicate the ranges of temperature and relative humidity that will be comfortable with the ...
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In a paper entitled From Comfort Zone to Performance Management, White examines the hypothesis from a theoretical perspective starting with the Comfort Zone Theory and the work of Robert Yerkes and John Dodson, David McClelland et al., the Tuckman Model and Colin Carnall. This theoretical examination leads White to conclude that the White ...
Displacement ventilation systems supply air directly to the occupied zone.The air is supplied at low velocities to cause minimal induction and mixing. This system is used for ventilation and cooling of large high spaces, such as auditorium and atria, where energy may be saved if only the occupied zone is treated rather than trying to control the conditions in the entire space.