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ndoor Environmental Quality: particulate matter

 

Radiant Heating and Cooling Performance Characteristics - see also the radiant design guide.
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The heat transfer coefficients are used to describe the combined emission/absorption and convective transfer for radiant surfaces. Heat transfer coefficients can be used to determine surface temperatures (ts);

(flux/htc) + tr = ts (heating)
tr - (flux/htc) = ts (cooling)

where,

flux = load,
Btu/Hr ft
2
htc
= coefficient, Btu/hr ft2 F
tr = room temp, F
ts = required surface temp., F

 


Surface temperature limitations are based on comfort and safety.

Floor temperatures shown are for wearing normal footwear. For socks, stocking or bare feet, the surface temperature is a function of the floor conductivity and can vary from 72F to 82F for carpets to tile respectively.

Wall and ceiling temperatures are based on radiant asymmetry.

In no case should temperatures exceed material property recommendation such as drywall at 125F

 


The flux capacities are used to describe the maximum radiant heating emission and radiant cooling absorption with convective transfer which can be obtained from a surface based on occupant comfort in offices and homes. These heat flux's can be used to establish maximum surface temperatures (ts);

(flux/htc) + tr = ts (heating)
tr - (flux/htc) = ts (cooling)

where,

flux = load,
Btu/Hr ft
2
htc
= coefficient, Btu/hr ft2 F
tr = room temp, F
ts = required surface temp., F

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