Pro/Forums - View Single Post - How much pump is enough? How much is too much?

Roscal · 05-21-2007, 12:48 PM

Hydraulic power[W] = Flowrate[m³/s] * Pressure[mH2O] * Fluid density[kg/m³] * g[9.81 m/s²]

You know the input power (electrical), then global efficiency is the ratio between hydraulic power and input power. For instance, a Laing DDC 10 W has a peak efficiency of ~17 % where a Laing D5 is ~14 %. Quite bad, but normal for such little pumps. The bigger the pump is, the better the efficiency will be generally.

Heat induced by an element uses the same formula, but pressure become its pressure drop instead. At final : hydraulic power provided by pump = sum of all heat induced by each element due to flow (to fight against friction), all water movement is converted to heat.

05-21-2007, 12:48 PM	#252
Roscal Cooling Savant Join Date: Apr 2002 Location: North of France Posts: 198	Re: How much pump is enough? How much is too much? Hydraulic power[W] = Flowrate[m³/s] * Pressure[mH2O] * Fluid density[kg/m³] * g[9.81 m/s²] You know the input power (electrical), then global efficiency is the ratio between hydraulic power and input power. For instance, a Laing DDC 10 W has a peak efficiency of ~17 % where a Laing D5 is ~14 %. Quite bad, but normal for such little pumps. The bigger the pump is, the better the efficiency will be generally. Heat induced by an element uses the same formula, but pressure become its pressure drop instead. At final : hydraulic power provided by pump = sum of all heat induced by each element due to flow (to fight against friction), all water movement is converted to heat. Last edited by Roscal; 05-21-2007 at 12:54 PM.