Weighted Average

Definition

A blending calculation where the combined property of two streams is weighted by their flow rates.

When two streams combine, the resulting temperature, conductivity, or dissolved oxygen is the flow-weighted average of the two inputs, given by Result = (Q1C1 + Q2C2) / (Q1 + Q2). Q is the flow rate and C is the property being calculated. This is the calculation behind the boiler feedwater mixing example, where condensate return and makeup combine into feedwater.

Related concepts

Boiler Feedwater · Makeup Water · Condensate Return

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Part of The Blueprint of Water · 📏 measurement