Appendix G: Units And Conversions - C-THERM TCi Operator's Manual

TCi Operator Manual

Appendix G: Units and Conversions

Basic symbols and dimensions:
Thermal Conductivity
Thermal Diffusivity
Heat Capacity
Density
Energy
Energy Rate (Watts)
Change in absolute
Temperature
Time
Effusivity
Thickness
Depth of Penetration
Conversions
Thermal conductivity: 1 W/mK
Thermal Diffusivity:
Heat Capacity:
Density:
Energy:
Energy Rate (Power): 1 J/s(W)
Change in Temperature: 1 K
Temperature:
122
MKS (SI)
k
(W/mK)

2
(m /s)
Cp
(J/kg/K)

3
(kg/m )
J
(Joules)
W = J/s
(Watts)
K (Kelvin)
s (seconds)
e
(W  s
1/2 2
/m /K)
l(m)
d(m)
= 0.002389 cal/s  C
= 0.5785 Btu/hr/ft/  F
= 6.942 Btu  in/hr/ft
2
1 m /s =1000000 mm
=10000 cm
1 J·K/kg =2.388x10
=2.391x10
3
1 kg/m =0.01 g/cm
=0.06243 lb/ft
1 J =0.23885 cal
=9.4782x10
=0.056869 Btu/min
=1  C
=1.8  F
 C to  F  F = 1.8  C + 32
CGS
k
(cal/s  C)

2
(cm /s)
Cp (cal/g/  C)

3
(g/cm )
J
(Joules)
W
 C
s(seconds)
e
(cal  s
1/2 2
/cm /K)
l(cm)
d(cm)
/  F
2
2
/s
2
/s
cal/g/  C
-4
Btu/lb/  F
-4
3
3
-4
Btu
Imperial
k
(Btu/hr/ft/  F)
 F)
2
or (Btu*in/hr/ft

(-)
Cp
(Btu/lb/  F)

3
(lb/ft )
Btu
(British Thermal Units)
Btu/min
 F
hr, min
e
/  F)
1/2 2
(Btu/hr /ft
l(ft)
d(ft)