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Mean radiant temperature and the angle factor In a more advanced review of MRT, we can not only look at the individual surface temperatures and their area but also the distance of those surfaces from the occupant and whether that person is seated or standing. Well let's say you live in a cold climate and have a home office where your back will be facing a large northern facing window.

Virtually an entire industry of manufacturers, suppliers, builders and trades people incorrectly equate thermal comfort with air temperatures. Your body already produces heat so it's only necessary to add or remove enough heat from a space to maintain a reasonable balance between the operative temperature and the occupant, and this can be accomplished very effectively first with a combination of architecture, interior design and then if needed high temperature radiant cooling and low temperature radiant heating systems. Thermal Comfort Instrumentation (Courtesy of Innova) - measures mean radiant temperature, dry bulb temperature, humidity, air velocity, radiant asymmetry and other metrics of the ANSI/ASHRAE Standard 55 - Thermal Environmental Conditions for Human Occupancy."Since the mean radiant temperature has a considerable influence on man’s heat loss and thus on his state of comfort, its calculation is important in the detailed thermal analysis of a room..." Fanger, P.O., Thermal Comfort: Analysis and Applications in Environmental Engineering, Mc Graw-Hill Book Company, 1970 "For rooms in which all surfaces have a uniform temperature, the emittance has therefore no influence on the mean radiant temperature.O., Thermal Comfort: Analysis and Applications in Environmental Engineering, Mc Graw-Hill Book Company, 1970"I say, if building codes dropped the reference to controlling air temperatures and switched the requirements to controlling mean radiant temperature, building performance specifications would have to change overnight.Bad buildings have low MRT’s in winter and high MRT’s in summer; this contributes to large differences in the vertical air temperature; creates excessive drafts and increased radiant asymmetry.

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