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1. Creating the Calculation Skeleton using the Eigen Calculation Builder then Dragging the relevant tags from the basket into the Calculation.
Step 1 - write out the calculation
We know the calculation we want to do is:
LMTD = ((Temp Hot Inlet - Temp Outlet Cold) - (Temp Outlet Hot - Temp Inlet Cold)) / LN ((Temp Hot Inlet - Temp Outlet Cold) - (Temp Outlet Hot - Temp Inlet Cold))
So we can start writing a few things in a calculation builder
- A division is written like - DIV(0,0)
- A subtraction is written like - SUB(0,0)
- A subtraction with in a subtraction is SUB(SUB(0,0),SUB(0,0))
- A LN statment is LN(0)
Now lets build the calculation
- Numerator = SUB(SUB(0,0),SUB(0,0))
- Denominator = LN(SUB(SUB(0,0),SUB(0,0)))
- Wrap it in a Divide we get
- DIV(SUB(SUB(0,0),SUB(0,0)),LN(SUB(SUB(0,0),SUB(0,0)))
Step 2 - Populate are calculation builder with the tags from the basket
- Drag a tag from the basket into a spot.
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NOTE - The trends at the end of each tag indicate it. If a tag is input wrongly this will not display. It will also indicate if your calculation is invalid. |
2. Build the calculation in layers adding each layer into the basket.
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