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Table 13 Heat Emitter Radiant Fraction

 
Heat emitter
Radiant fraction
 
 
Forced warm air heaters
0
 
 
Natural convectors and convector radiators
0.1
 
 
Multicolumn radiators
0.2
 
 
Double and triple panel radiators and double
 
column radiators
0.3
 
 
Single column radiators, floor warming systems,
 
block storage heaters
0.5
 
 
Vertical and ceiling panel heaters
0.67
 
 
High temperature radiant systems
0.9
 
Note that if the heater is obstructed by furniture or a floor warming system is impeded by carpet on the floor, allowance must be made when calculating the heating load. For example, a radiant heater obstructed by furniture will behave more like a natural convector.