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moonlightcheese · 08-26-2005, 07:41 AM

as far as specs go for pumps, PQ is about as good as it gets but it's difficult to determine the flow rate of a system with only that information since all of the pressure drop is happening at the water blocks. i was hoping to see some way of determining how much pressure drop to expect from a specific block along with the dTvsQ graph in the block reviews. the purpose of this measurement is to help with deciding on a pump to get for a specific system.

the way i'm understanding is, that at extremely low flow rates (eg. 0.5GPH) there is no pressure drop since it's hard to really restrict such a flow rate. however there comes a specific flow rate at which pressure drop begins. this could be labeled as restriction point (i'm not sure what the technical term would be), the amount of flow necesarry to produce significant restriction.

also, in addition, it would be nice to have dPvsQ graph for each block to give an idea of how much restriciton to expect from a setup. this way you can just look at the pressure drop as a static number, which would make it much easier to choose a pump for a system. ie:

Storm G4 = ~3PSI and 1GPH restriction point
DDMazeGPU ~2.3PSI and 0.7GPH restriction point
tubing ~1PSI and negligible restriction point

so you need at least 6.3PSI of head pressure to produce a somewhat effective loop. this is just a suggestion from my incredibly elementary understanding of pressure and flow, where (as i've read... as long as i haven't misread) the total drop in pressure is the sum of all of the restrictions in the loop. it may not be that simple but this gives a rough idea to people who need to know which pump to get for a specific setup given "x" "y" and "z" blocks in the loop.

is something like this possible? or even feesible?

08-26-2005, 07:41 AM	#1
moonlightcheese Cooling Neophyte Join Date: Jul 2005 Location: Atlanta, GA Posts: 13	regarding specs as far as specs go for pumps, PQ is about as good as it gets but it's difficult to determine the flow rate of a system with only that information since all of the pressure drop is happening at the water blocks. i was hoping to see some way of determining how much pressure drop to expect from a specific block along with the dTvsQ graph in the block reviews. the purpose of this measurement is to help with deciding on a pump to get for a specific system. the way i'm understanding is, that at extremely low flow rates (eg. 0.5GPH) there is no pressure drop since it's hard to really restrict such a flow rate. however there comes a specific flow rate at which pressure drop begins. this could be labeled as restriction point (i'm not sure what the technical term would be), the amount of flow necesarry to produce significant restriction. also, in addition, it would be nice to have dPvsQ graph for each block to give an idea of how much restriciton to expect from a setup. this way you can just look at the pressure drop as a static number, which would make it much easier to choose a pump for a system. ie: Storm G4 = ~3PSI and 1GPH restriction point DDMazeGPU ~2.3PSI and 0.7GPH restriction point tubing ~1PSI and negligible restriction point so you need at least 6.3PSI of head pressure to produce a somewhat effective loop. this is just a suggestion from my incredibly elementary understanding of pressure and flow, where (as i've read... as long as i haven't misread) the total drop in pressure is the sum of all of the restrictions in the loop. it may not be that simple but this gives a rough idea to people who need to know which pump to get for a specific setup given "x" "y" and "z" blocks in the loop. is something like this possible? or even feesible?