Operative temperature


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Operative temperature

In determining thermal comfort, operative temperature is roughly the average of the air and mean radiant temperature (MRT) a person is experiencing.
References in periodicals archive ?
To determine the similarities between PMV and TSV indices, the relationships between TSV & PMV and indoor operative temperature are shown in Figure 3.
The 2017 edition of the standard also includes a simplification of Appendix A to a single procedure for calculating operative temperature, clearly stated requirements and calculation procedures that appear sequentially, an update to the scope to ensure the standard is not used to override health safety, and critical process requirements.
The effect on the wallfilm mass formation and on the wall heat flux is evaluated for the two operative temperature considered, and reported in Figures 14.
In addition, several indices, including operative temperature ([T.sub.o]), equivalent temperature ([T.sub.eq]), Oxford index (wet-dry index--WD), discomfort index (DI), fighter index of thermal stress (FITS), modified discomfort index (MDI), environmental stress index (ESI), wet-bulb dry temperature (WBDT), and relative humidity dry temperature (RHDT), were also estimated based on the published literature [13,23-29,37].
* ASHRAE 55, 2004: Thermal comfort conditions for human occupancy, Section 5.2 o Operative Temperature 67.3 to 82.2 F o Humidity ratio limit 0.012 o Max Air speed 40 fpm at occupant level o Local thermal discomfort - radiant temperature symmetry, draft, vertical air temperature difference, floor surface temperature o Allowable Cyclic Operative Temperature variation = 2 F
In the building with radiant terminals, the long wave radiation between interior surfaces cannot be neglected and the control variable of indoor environment is usually the operative temperature. What is more, in the building with all-air system, the incident solar radiation on the interior surfaces firstly warms up the construction.
Since the CPVs is usually exposed in outdoor environments for a long time, the operative temperature of Fresnel lens is assumed to be consistent with the ambient temperature.
Operative temperature ([T.sub.o]) is an approximation of the convective and radiant heat transfer on the surface of an animal, making it a useful measure to interpret the thermal environment experienced by animals versus [T.sub.a] alone (Dzialowski 2005).
Air temperature, related humidity as well as operative temperature and air velocity were measured in the centre of the room using the thermal comfort measurement system with data logger.
A modified operative temperature range of 22.9[degrees]C to 26.3[degrees]C (73.3[degrees]F to 79.3[degrees]F), obtained using questionnaire votes and field measurement data, revealed that the occupants of a tropical hospital favor an operative temperature range approximately 1[degrees]C(1.8[degrees]F) lower than that of the ASHRAE comfortable zone.
To evaluate the efficiency of thermoregulation, we used body temperature of 242 individuals taken in the wild, preferred body temperature of these individuals measured on a thermal gradient (16-45[degrees]C) in the laboratory, and operative temperature obtained by using hollow copper tubes that were sealed at each end, painted the same color as X.
"The operative temperature is the average of the air temperature and the mean radiant temperature of ail of the surfaces surrounding you," explains Peter Alspach, a voting committee member of ASHRAE SSPC 55 on Thermal Comfort and associate principal at Arup, an engineering consulting firm.