9 Heat Flow
Page 132 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
Figure 9.2.1.i Steam Flow Status
The Steam Flow Status screen shows that the feed water temperature is currently at 180.0
O
F, with
steam at a pressure of 51 PSI and 298.7
O
F.
Note: Feed water temperature sensors can be used for greater accuracy.
The amount of heat needed to change the feed water to steam, is found by the amount of heat needed
to raise 1 lb of feed water at 180.0
O
F to steam at 51 PSI and 298.7
O
F. The standard steam tables are
built in within the steam flow metering on the MM, and this is then calculated as 1032 Btu/lb. This
figure is the latent heat of liquid into steam (gas) plus the sensible heat components.
The steam flow rate is shown in lb/hr is determined by:
19,434,000/
1032/
Therefore the current steam flow rate is calculated to be 18,831 Btu/lb.
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