Heatiator ECO-WINS18 Indoor Fireplace User Manual


  Open as PDF
of 48
 
33Heatilator • ECO-WINS18 • 7065-132B • August 29 2011
C. Alternate Floor Protection Calculation
Material
Thermal Conductivity: k value
Thekvalueindicatestheamountofheat(inBTU’s)that
willowin1hourthrough1squarefootofauniformmate-
rial1inchthickforeachdegree(F)oftemperaturediffer-
encefromonesideofthematerialtotheother.
TheLOWERthekfactormeanslessheatisbeingcon-
ductedthroughthenon-combustiblematerialtothecom-
bustiblematerialbeneathit.
Thekvalueofamaterialmustbeequalorsmallerthenthe
requiredkvaluetobeacceptable.
(BTU)(inch)
(foot
2
(hour)(
o
F)
Thermal Resistance: R value
TheRvalueisameasureofamaterial’sresistanceto
heattransfer.
Rvalueisconvenientwhenmorethanonematerialis
usedsinceyoucanaddtheRvaluestogether,where-
asyoucannotdothisforkvalue.
TheHIGHERtheRfactormeanslessheatisbeing
conducted through the non-combustible material to
thecombustiblematerialbeneathit.
TheRvalueofamaterialmustbeequalorlargerthen
therequiredRvaluetobeacceptable.
Conversion Procedure
1.ConvertspecicationtoR-value
a.R-valuegiven-noconversionneeded
b.k-factorisgivenwitharequiredthickness(T)in
inches.[R=1/kXT]
c.K-factorisgivenwitharequiredthickness(T)
ininches.[R=(1/KX12)XT]
d.r-factorisgivenwitharequiredthickness(T)in
inches.[R=rXT]
2.DeterminetheR-valueoftheproposedalternateoor
protector
a.Usetheformulainstep1toconvertvaluesnot
expressedas“R”.
b.Formultiplelayers,addR-valuesofeachlayer
todetermineoverallR-value.
3.IftheoverallR-valueofthesystemisgreaterthanthe
R-valueofthespeciedoorprotector,thealternateisac-
ceptable.
 previous next