KEP ES749 - 3.13 Steam - Condensate Heat; 4.3 Wiring In Hazardous Areas

ES749 Flow Computer
23
3.13 Steam – Condensate Heat
Measurements:
Actual condensate volume ow is measured by the ow element (DP transmitter,
Flowmeter). Condensate temperature is measured by the temperature transmitter. A
pressure transmitter is used to monitor steam pressure.
Calculations:
• The condensate density, volume ow, mass ow and saturated steam energy -
condensate energy are calculated using the uid characteristics stored in the ow
computer. (see "FLUID DATA" submenu)
Output Results:
• Display Results
Steam – Condensate Heat, Condensate Mass and Volume Flow Rate, Resettable
Total, Non-Resettable Total, Temperature, Pressure, Condensate Density
(optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Net Heat Flow, Mass and Volume Flow Rate, Condensate Temperature, Steam
Pressure, Condensate Density, Peak Demand, Demand Last Hour
• Pulse Output
Net Heat, Mass or Volume Total
• Relay Outputs
Net Heat, Mass or Volume Flow Rate, Total, Condensate Temperature, Steam
Pressure Alarms, Peak Demand, Demand Last Hour
Applications:
Calculate the energy stored in steam – the energy in returned condensate water.
STEAM –
CONDENSATE
ENERGY METER
Steam – Condensate
Heat Illustration
Volume Flow
As calculated in section 3.8
Net Heat Flow
Calculations
Flowmeter
Pressure
Transmitter
PRINT
5
0
–
TIME
CLEAR
•
MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND
6
SCROLL
7
PRE 2
8
DENS
9
Saturated
Steam
Water
Temperature
Transmitter
T
1
Condensate
Steam
Net Heat Flow = condensate volume ow • condensate density • [enthalpy steam (P
f
) – enthalpy water (T
f
)]