On 11-08-04 04:24 PM, Peter Gluck wrote:
But Cousin, cold water has a greater viscosity! It is excatky the opposite!
Arrgh -- that's totally irrelevant. The (viscous) cold water flows into the water heater instead of the tub, the heater acts as a flow reduction device, and from there the hot water runs up and into the tub. Net effect is that hot water flows more slowly than cold, or at any rate that's what I typically see -- Jed's observation is totally reasonable and consistent with everyday experience.
Why are you picking at this nit? 1 l/s is a perfectly reasonable flow rate for setting the taps wide open.
If there's something that's not reasonable about it, it's the value: 1... Remarkable coincidence, if that's actually an exact 1, as in 1.00. You might expect it to be 0.63, or 1.32, or 2.1, or 0.4, or some such, rather than that most round of all numbers, "1". OTOH if it's not an *exact* "one" but is, rather, a common garden variety value of 1, with 1 significant digit, then the "true" value could be anywhere from 0.5 to 1.5 l/s and it's not so surprising that the flow rate result came out to "1".
But that would throw a substantial uncertainty into the actual power generated.
Jeeze, man,
On Thu, Aug 4, 2011 at 11:17 PM, Jed Rothwell <[email protected] <mailto:[email protected]>> wrote:Peter Gluck <[email protected] <mailto:[email protected]>> wrote: Have you measured the volume of your bathtube and seen in howmay seconds it is filled?.Yes. It is an Americh, Beverly 2020 model ("Japanese inspired"): http://www.americh.com/pd3.php?s_product_model=Beverly&s_product_shape=Square&product_id=40 <http://www.americh.com/pd3.php?s_product_model=Beverly&s_product_shape=Square&product_id=40> The specifications refer to "Whirlpool Operating Gallons = 68 (Liters = 257)" which is to say the level at which the whirlpool sensors are submerged. It takes 5 or 6 minutes to fill to this level. I use a kitchen timer to do this every day. That's ~11 to ~13.6 gpm. That's with hot water. I think it fills faster with cold water. - Jed -- Dr. Peter Gluck Cluj, Romania http://egooutpeters.blogspot.com
