IM-P408-04
EMM Issue 7
48
B850-W and B850-P Boiler House Energy Monitor
Enthalpy
Calculation for Metric (kW)
Click on
Edit each '1' in the above calculation to add the following values:
Flow co-efficient - Kv -
Value must be taken from the technical documentation of
the BBD Valve.
Enthalpy (kJ / kg) -
Derive the value for your boiler from the look up tables in Section
10.31.3
Density (kg / m³) -
Derive the value for your boiler from the look up tables in Section
10.31.3
Other measured units: Pressure (bar) and Relative Density (kg / m³).
It is assumed that there will be a backpressure of 10%, so a factor of 0.9 can be seen
in the calculation. If backpressure is different adjust formula accordingly.
( Y.Vb
*1*1*1*
s qr t((A .p D * 0. 9)*10 0 0/1))
3600
Density
Kv
When you enter this screen a
pop-up will be displayed to
remind you to enter the Flow
co-efficient, Enthalpy and
Density, click enter to clear the
pop -up. Once you have
entered a value the pop-up will
not re-appear.
