Recent content by adamjbradley

I'm trying to determine load ratings for a deep groove roller bearing for use in a roller skate. I suspect I'll be looking at 100kg x 9.8N / 4 (2 bearings per wheel, likely only every to have a single set of wheels, front or back - 4 bearings - on the ground) * 2 (but this could be a landing!)...

I think the following applies for heating water 11L/minute (0.183 kg/s) at 80C (dt is 55C) q = h / ( cp ρ dt ) where q = volumetric flow rate h = heat flow rate cp = specific heat capacity ρ = density dt = temperature difference h = q ( cp ρ dt ) and h = 0.183 ( 4.2 ) ( 55) h =...

Sorry I dropped off the radar, been caught up in the floods in Brisbane Australia. The latter, I'm pumping water at 11 litres/minute and need to know the energy input required to heat that flow rate to 80C (from 20C). Thanks for your patience. Adam

I'd like to know how to calculate how many J of energy I need to provide in order to satisfy that requirement and some suggestions on how (preferably solar thermal, ideally with storage!) This is a little residential project. Adam

I'll elaborate a little. I trying to work out how to calculate and how to make at least 180 F (80 C) and 3 gallons per minute (11 liters/min)? Thanks in advance! Adam