Scaling a Hot Water Supply Setpoint with the Linear Programming Block
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The following example shows how the Linear programming block can be used to scale values.
The Linear programming block can be used to scale a hot water supply setpoint. When the Outside Air Temperature (OAT) is 41°F, the hot water supply setpoint is 203°F; and when the OAT is 59°F, the hot water supply setpoint is 158°F. OATs between 41°F and 59°F result in a hot water supply setpoints that are scaled between 203°F and 158°F.
Consider an OAT of 52°F.
If ( x1, y1) = (41, 203)
and, (x2, y2) = (59, 158)
and, if the In slot has a value of 52°F then hot water setpoint in °F :
If the two points given above and the OAT of 52°F are on the inputs to the Linear programming block, the Linear programming block will output a value of 175.5°F.