Civil Engineering Reference
In-Depth Information
Table 20.2
Basic data
SI unit
English unit
F
Specific heat-water
4.186
kJ/kg
K 1
Btu/lb
F
Specific heat-air
1
kJ/kg
K 0.239 Btu/lb
kJ/kg
K 0.499 Btu/lb
F
Specific heat-superheated industrial steam (0.5-1 MPa) 2.09
Specific heat-steam in the atmospheric air (
<
0.1 MPa) 1.8
kJ/kg
K 0.430 Btu/lb
F
Average enthalpy of industrial steam
2,600
kJ/kg
1,160 Btu/lb
air
a
kg/Sm
3
lb/Sft
3
Density
1.29
0.081
natural gas
b
kg/Sm
3
lb/Sft
3
Density
0.75
0.047
kg/m
3
62.430 lb/ft
3
8.35
Density
water
1,000
lb/gallon
Lower Heating Value (LHV)
oil
41,860 kJ/kg
17,997 Btu/lb
natural gas
b
34,325 kJ/Sm
3
Btu/Sft
3
Lower Heating Value (LHV)
922
a
Referred to 0
C, 32
F and 0.1 MPa, 14.69 psi
b
Referred to 15.6
C, 60
F and 0.1 MPa, 14.69 psi
