Civil Engineering Reference
In-Depth Information
Table 20.1
Basic formulas
SI system
English system
Heating
c
m
Δ
T
[kW]
c
m
Δ
T
[Btu/h]
[Btu/lb
F]
[
F]
[kJ/kg
K]
[kg/s]
[K]
[lb/h]
Δ
h
m
[kW]
Δ
h
m
[Btu/h]
[kJ/kg]
[kg/s]
[Btu/lb]
[lb/h]
Heat transfer
A
U
Δ
T
[W]
A
U
Δ
T
[Btu/h]
[m
2
]
[W/m
2
[ft
2
]
ft
2
K]
[K]
[Btu/h
F]
[
F]
A
(1/
R
th
)
Δ
T
[W]
A
(1/
R
th
)
Δ
T
[Btu/h]
[m
2
]
[W/m
2
[ft
2
]
ft
2
F]
[
F]
K]
[K]
[Btu/h
Ideal gas
p
v
¼
constant
T
p
v
¼
constant
T
[m
3
]
[ft
3
]
[Pa]
[K]
[psi]
[R]
Water pump
Q
H
(9.81)/
η
[kW]
Q
H
(0.188)/
η
/1,000
[kW]
[m
3
/s]
[m]
[gpm]
[ft]
Hydraulic turbine
Q
H
(9.81)
η
[kW]
Q
H
(0.188)
η
/1,000
[kW]
[m
3
/s]
[m]
[gpm]
[ft]
Gas compressor (isentropic)
(from isentropic to real compression multiplied by 1.5)
q
inlet
p
inlet
ln(
p
outlet
/
p
inlet
)/1,000
[kW]
q
inlet
p
inlet
(3.254)
ln(
p
outlet
/
p
inlet
)/1,000
[kW]
[m
3
/s]
[ft
3
/min]
[Pa]
[psi]
Fan
Q
Δ
P
/
/1,000
[kW]
Q
Δ
P
(0.1175)/
/1,000
[kW]
η
η
[m
3
/s]
[ft
3
/min]
[Pa]
[in H
20
]
