Heat Coefficients
Coefficients of Heat Transmission
Heat transmitted, in British thermal units, per second,
through metal 1 inch thick, per square inch of surface, for a temperature
difference of 1°F.
|
Metal
|
Btu
per second
|
Metal
|
Btu
per second
|
Metal
|
Btu
per second
|
|
Aluminum
|
0.00203
|
German Silver
|
0.00050
|
Steel, soft
|
0.00062
|
|
Antimony
|
0.00022
|
Iron
|
0.00089
|
Silver
|
0.00610
|
|
Brass, yellow
|
0.00142
|
Lead
|
0.00045
|
Tin
|
0.00084
|
|
Brass, red
|
0.00157
|
Mercury
|
0.00011
|
Zinc
|
0.00170
|
|
Copper
|
0.00404
|
Steel, hard
|
0.00034
|
|
|
Coefficients of Heat Radiation
Heat radiated, in British thermal units, per square foot of
surface per hour, for a temperature difference of 1°F.
|
Surface
|
Btu
per Hour
|
Surface
|
Btu
per hour
|
|
Cast-iron, new
|
0.6480
|
Sawdust
|
0.7215
|
|
Cast-iron, rusted
|
0.6868
|
Sand, fine
|
0.7400
|
|
Copper, polished
|
0.0327
|
Silver, polished
|
0.0266
|
|
Glass
|
0.5948
|
Tin, polished
|
0.0439
|
|
Iron, ordinary
|
0.5662
|
Tinned iron, polished
|
0.0858
|
|
Iron, sheet, polished
|
0.0920
|
Water
|
1.0853
|
|
Oil
|
1.4800
|
|
|
Freezing Mixtures
|
Mixture
|
Temperature
Change, Degrees F.
|
| From
|
To
|
|
Common salt (NaCl), 1 part;
snow, 3 parts
|
32
|
±0
|
|
Common salt (NaCl), 1 part;
snow, 1 part
|
32
|
-0.4
|
|
Calcium chloride (CaCl2),
3 parts; snow, 2 parts
|
32
|
-27
|
|
Calcium chloride (CaCl2),
2 parts; snow, 1 part
|
32
|
-44
|
|
Sal ammoniac (NH4Cl),
5 parts; saltpeter (KNO3), 5 parts; water 16 parts
|
50
|
+10
|
|
Sal ammoniac (NH4Cl),
1 part; saltpeter (KNO3), 1 part; water 1 part
|
46
|
-11
|
|
Ammonium nitrate (NH4NO3),
1 part; water, 1 part
|
50
|
+3
|
|
Potassium hydrate (KOH), 4
parts, snow, 3 parts
|
32
|
-35
|
Download:
- Heat Coefficients
