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ANSI/ASHRAE Standard 55: ... The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0.20 m/s (39 ft/min).
ASHRAE Standard 55 sets limits on the allowable temperature differences between various surfaces. Because people are more sensitive to some asymmetries than others, for example that of a warm ceiling versus that of hot and cold vertical surfaces, the limits depend on which surfaces are involved.
The norm ISO 7730 and the ASHRAE 55 standard give the predicted percentage of dissatisfied occupants (PPD) as a function of the radiant temperature asymmetry and specify the acceptable limits. In general, people are more sensitive to asymmetric radiation caused by a warm ceiling than that caused by hot and cold vertical surfaces.
In the United States, ASHRAE Standard 55 prescribes 3°C as the limit for the vertical air temperature difference between head and ankle levels, but has no standard recommending an ideal ΔT between floor and ceiling. [4]
The first of the cooling load factors used in this method is the CLTD, or the Cooling Load Temperature Difference. This factor is used to represent the temperature difference between indoor and outdoor air with the inclusion of the heating effects of solar radiation. [1] [5] The second factor is the CLF, or the cooling load factor.
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Drought conditions have gripped nearly the entire country, with only one state spared as a bone-dry autumn left most states parched. In November, Kentucky became the 49th state to cross into ...
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