Liquid Controls SP4000 - Manual (Page 22)

19
SP4000 Flow Computer
3.7 Liquid Sensible Heat
Measurements:
Actual volume flow is measured by the 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 flow and sensible heat are calculated using the fluid characteristics
stored in the flow computer. (see "FLUID DATA" submenu)
Output Results:
• Display Results
Sensible 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
Sensible Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density,
Peak Demand, Demand Last Hour
• Pulse Output
Sensible Heat, Mass or Volume Total
• Relay Outputs
Sensible Heat, Mass or Volume Flow Rate, Total, Temperature, Pressure Alarms,
Peak Demand, Demand Last Hour
Applications:
Calculate the energy stored in a condensate with respect to water at 32
°
F (0
°
C).
LIQUID SENSIBLE
HEAT
Liquid Sensible Heat
Illustration
Volume Flow
As calculated in section 3.4
Heat Flow
Heat Flow = C • volume flow • (1-
α
• (T
1
-T
ref
)) 2 • ref. density • (T
1
- 32)
α
= Thermal expansion coefficient • 10 -6
C = Specific heat
Calculations
Flowmeter Temperature
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