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Cathar · 11-26-2003, 03:02 PM

The problem with doing what Joe has done is that different pumps obviosuly have different PQ characteristics. How one pump reacts when artificially restricted to 1GPM with a subsequent resistance added is going to be different to how a different pump reacts artificially restricted to 1GPM with the same resistance added.

JoeC needs to settle on either using a fixed pressure drop across the block (ala BillA), a fixed pump (fairly useful to many people with a similar pump - not so useful for flow rate predictions though), or a fixed flow rate and measure the PD at that fixed flow rate.

He's created a bit of a mish-mash of data here. The flow-rates are all close enough to be roughly comparable, but Joe seems to be reluctant to settle on any of the above three scenarios, and has instead settled on something weird that sits in-between.

11-26-2003, 03:02 PM	#13
Cathar Thermophile Join Date: Sep 2002 Location: Melbourne, Australia Posts: 2,538	The problem with doing what Joe has done is that different pumps obviosuly have different PQ characteristics. How one pump reacts when artificially restricted to 1GPM with a subsequent resistance added is going to be different to how a different pump reacts artificially restricted to 1GPM with the same resistance added. JoeC needs to settle on either using a fixed pressure drop across the block (ala BillA), a fixed pump (fairly useful to many people with a similar pump - not so useful for flow rate predictions though), or a fixed flow rate and measure the PD at that fixed flow rate. He's created a bit of a mish-mash of data here. The flow-rates are all close enough to be roughly comparable, but Joe seems to be reluctant to settle on any of the above three scenarios, and has instead settled on something weird that sits in-between. Last edited by Cathar; 11-26-2003 at 03:16 PM.