Thanks, Karl. I was not actually serious when I posted my questions, just responding to what I thought was a humorous thread. I am familiar with the nature of closed cooling systems, just not with differential equations, which apparently are not necessary anyway when discussing the Vanagon cooling system. Guess I should have waited until Friday to post :)... Dan "Karl F. Bloss" wrote: > > based on the original poster's assumption that the water pump has to work > > relatively hard to pump coolant uphill, would it do less real work if the van > > were constantly driven downhill? > > Forget differential equations. If it's a closed non-leaking system, it doesn't > matter how the van is facing, the waterpump is only overcoming the frictional > losses in the system, not pumping up or down. I.e. the more piping, the more > friction, the more the pump has to work. > > Uphill and downhill don't matter because the starting and stopping point for > the fluid is the same. If the van is facing downhill, for every unit mass of > coolant that's going downhill, another unit mass is going uphill and vice versa > if it's pointing uphill. > > -Karl |
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