For the return pipe our minimum pressure constraint is
Php,s - ∑ ∆Ps, j - ρs gz - ∆Phe,i - ∆Pcv,i - ∑ ∆Pr, j ≥ Px,sat + Psaf.
(4-23)
j
j
And at the inlet to the pump located at the heating plant, we have two constraints
Php,r ≥ PNPSH
(4-24)
Php,r ≥ Pa+ Pasa.
(4-25)
Now we have identified all of the constraints on the multiple consumermultiple
pipe solution and derived mathematical expressions for each one. In the next
chapter, we will examine a method of finding an optimal solution that satisfies all
of the constraints.
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