6.1.2 Calculations for Steam Flow Metering with Deaerator
1: First the percentage “Make up“ in the “Feed water” must be calculated.
Where %Mu = % Cold make up water
V1 = Volume of condensate return water
V2 = Volume of cold make up water
%Mu=
100 x V2
(V2+V1)
Example: 1
Steam boiler with a volume of condensate return at 40 GPM and make up water at 8 GPM
Make up %=
100 x 8
(8+40)
=16.7%
To calculate the second part to establish the “Weighted Average Temperature” the following equation
is used.
Where Tave = Weighted Average temperature
T1A = Temperature of condensate
T1 = Temperature of make up water
%Mu = Percentage of make up water
Tave=T1A-
(%Mu x (T1A-T1))
100
Steam boiler with condensate return temperature of 176°F and a make up water temperature of
41°F. From the above example (1) the make up percentage is 16.7%
Weighted Average = 176 -
(16.7 x (176 – 41))
100
= 153.4°F
To implement the above control form the following calculations have been imbedded in the revised
software to obtain the “Weighted Average Temperature” (T ave).
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