Comfort envelope

Comfort envelope

The range of conditions in mechanically ventilated buildings in which the majority of occupants are likely to feel comfortable. ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) Standard 55 defines a comfort zone based on the six variables of air temperature, air velocity, relative humidity, radiant temperature, and occupant’s clothing insulation and activity level.
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While it's hard to find a major change in any one area, there are numerous changes spread across the performance, handling, aero, braking and comfort envelope that make the 650S a more focused, sharper, and a more comfortable drive than the 12C.
Using the SET program, I found that when calculating the comfort zones with an air speed of 70 fpm (0.35 m/s), the comfort envelope moves to the right less than the thickness of the line defining the comfort zone!
A simple control strategy that will work year-round (and will change with the weather) is to open windows when outdoor conditions fall within the ASHRAE Standard 55-2010 adaptive comfort envelope and to close windows when indoor conditions are approaching the boundaries of the comfort envelope.
Comfort envelope. Starting with these still-air zones, 0.5 and 1.0 clo comfort envelopes for air speeds above 0.15 m/s (30 fpm) are generated using the SET model.
"Ceiling fans as extenders of the summer comfort envelope." ASHRAE Transactions 89(1):245 -263.
Starting with this range, comfort envelopes are defined using the work of Nicol (2004) on air movement: when the air velocity is above 0.1m/s, the comfort temperature can be raised according to Eq.