varying head
varying head
(OP)
In a closed water circulation system with 2-way valves at the consumers and the constant head control, when the valves close, the system resistance and head increases, the system curve comes up and the control through an invertor lowers pump's rpm. Pump curve goes down and the head is kept at a set (constant) level - the horizontal line on the flow-head diagram. But what is going on when the varying head control is used - when the line on the diagram is kept inclined and there are two set points - the head and 1/2 head (Grundfos)?





RE: varying head
Independent events are seldomly independent.
RE: varying head
To set varying head control you do the same only the control (Wilo) automatically introduce another SP - 1/2 Head - that is 5 m . Between these two points the pump is supposed to proportionally run. Only I do not understand how the control knows that, for instance, at the demand 100 % (not 50 % or 75 % ) the head should be adjusted to exactly 10 m, and, at which % demand it should be 5 m ?
RE: varying head
Independent events are seldomly independent.
RE: varying head
RE: varying head
Independent events are seldomly independent.
RE: varying head
RE: varying head
Now you have me curious, I'm going to have to look at that again....
RE: varying head