KEP ES749 - Heat Flow Computation; Sensible Heat Flow Computation; Liquid Delta Heat Computation; Expansion Factor Computation for Square Law Flowmeters

ES749 Flow Computer
96
∆p
27.7 •p
f
R=1–
κ−1
1−β
4
)•(
κ
•R
2/
κ
•(1-R
(κ−1)/κ
)
[(1 −(β •
4
R))•(1 -R)]
2/
κ
Y=
=1.0Y
Sensible Heat Flow:
Special Case for Water
heat ow = mass ow (Tf) • enthalpy ( Tf )
Liquid Delta Heat:
General Case
heat ow = mass ow • specic heat • ( T2 - Tf )
Water Case
heat ow = mass ow(Tf) • [enthalpy (T2 ) - enthalpy (Tf)]
Expansion Factor Computation for Square Law Flowmeters:
In the following Equations, delta P is assumed in ("H
2
O), Pf is in PSIA, 27.7 is a PSIA to ("H
2
O) units
conversion.
Liquid Case
Y = 1.0
Gas, Steam Case
Orice Case
delta P
Y = 1.0 -(0.41 + 0.35•B
4
) •
isentropic exponent • Pf • 27.7
V-Cone, Venturi, Flow Nozzle, Wedge Case:
NOTE: An equivalent formula is used by V-Cone owmeter types.
Target, Annubar, Pitot Case:
7.3.9
Sensible Heat
Flow
Computation
7.3.10
Liquid Delta Heat
Computation
7.3.11
Expansion Factor
Computation for
Square Law Flow-
meters
Heat Flow Computation:
Steam Heat
heat ow = mass ow • total heat steam(Tf, Pf)
Steam Net Heat
heat ow = mass ow • [total heat steam(Tf, Pf) - heat saturated water(Pf)]
Steam Delta Heat
heat ow = mass ow • [total heat saturated steam (Pf) - heat water (Tf)]
7.3.8
Heat Flow
Computation