[Greenbuilding] hotter water

[Clarke Olsen]

Gently is meaningless for a closed loop, but I just meant diffused horizontally, trying not to stir the storage. 
I was slow on the up-take on stratification: couldn't see any point in running through warm water when 
there is cool below, but of course one of the uses of stratification is to have the coldest fluid available for
extracting the last, after the upper level has picked the low-hanging btu.

Clarke Olsen
clarkeolsendesign
373 route 203
Spencertown, NY 12165 
USA
518-392-4640
colsen at taconic.net




On Jul 5, 2012, at 11:26 PM, Nick Pyner wrote:

> I've got strong doubts about this too. The word "gently" is quite fraught.
> The only way I can see to "dump gently " is to do it slowly, and that looks
> like a fatal mistake. This might not be so obvious at the storage tank, but
> becomes rather glaring at the collector. There, the circulating medium looks
> like a loop, irrespective of how it is treated at the tank. The efficiency
> of the collector is maximised by running it as cold as possible. The only
> way to achieve this is to circulate the medium as fast as practical, hence a
> pumped sytem is preferabe over the simplicity and reliability of a
> thermosiphon system. This does not sit well with gentle dumping at the tank.
> I'm sure there are sensible limits, but I submit the ideal collector would
> have the medium circulating so fast that the exit temperature is barely
> above that at the inlet, no significant heat rise, yet, but all the
> available energy has been totally extracted.
> 
> My own experience with grey water heat exchangers shows that flow rate is as
> much a player as temperature difference. Clearly what is needed is as much
> as possible of both but I am struggling to find out which is the most
> important. In practical terms, I submit that, if you are short of
> temperature difference, flow rate is a serious consideration. That is where
> the kWh lie hidden.
> 
> Nick Pyner
> 
> Dee Why   NSW
> 
> -----Original Message-----
> From: greenbuilding-bounces at lists.bioenergylists.org
> [mailto:greenbuilding-bounces at lists.bioenergylists.org]On Behalf Of
> Clarke Olsen
> 
> pulling
> from the bottom and dumping gently into the top, making a case for
> stratification.
> 
> 
> _______________________________________________
> Greenbuilding mailing list
> to Send a Message to the list, use the email address
> Greenbuilding at bioenergylists.org
> 
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org