KEP ES749 - 3.10 Liquid Combustion Heat; 4. WIRING

ES749 Flow Computer
20
3.10 Liquid Combustion Heat
Measurements:
Actual volume ow is measured by the ow element (DP transmitter, Flowmeter).
Temperature is measured by the temperature transmitter. A pressure transmitter can be
used to monitor pressure. Pressure measurement does not affect the calculation.
Calculations:
• The density, mass ow and combustion heat are calculated using the uid characteristics
stored in the ow computer. (see "FLUID DATA" submenu)
Output Results:
• Display Results
Combustion Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable
Total, Temperature, Pressure, Density (optional: peak demand, demand last hour,
time/date stamp)
• Analog Output
Combustion Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density,
Peak Demand, Demand Last Hour
• Pulse Output
Combustion Heat, Mass or Volume Total
• Relay Outputs
Combustion Heat, Mass or Volume Flow Rate, Total, Temperature, Pressure
Alarms, Peak Demand, Demand Last Hour
Applications:
Calculate the energy released by combustion of liquid fuels
LIQUID COMBUSTION
HEAT
Liquid Combustion
Heat Illustration
Volume Flow
As calculated in section 3.8
Heat Flow
Heat Flow = C • volume ow • (1-α • (T
1
-T
ref
))
2
• ref. density
α = Thermal expansion coefcient • 10
-6
C = Specic combustion heat
Calculations
FlowmeterTemperature
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
Optional
Pressure
Transmitter
T
1