🚀 go-pugleaf

On May 18, 2:55 pm, Joerg <notthisjoerg...@removethispacbell.net>
wrote:
> Jeff Liebermann wrote:
> > On Sat, 17 May 2008 11:43:25 -0700, Joerg
> > <notthisjoerg...@removethispacbell.net> wrote:
>
> >> True. But Li-Ion charge cycles are pretty well researched out by now. I
> >> doubt one can ever get to 200k miles with one set. But one can on the
> >> first engine, and then some.
>
> > Not really.  The A123 Systems batteries are HD Nanophosphate
> > technology which is allegedly better than conventional Li-Ion and LiPO
> > batteries.  Although commonly used in overpriced battery operated
> > power tools, there's really not enough field experience to predict
> > reliability and lifetime.
> > <http://www.a123systems.com/#/technology/power/pchart1/>
>
> > "Thousands and thousands" of charge cycles lifetime:
> > <http://www.a123systems.com/#/technology/life/>
> > Sounds a bit vague to me.
>
> > Fast Charging:
> > <http://www.a123systems.com/#/technology/power/pchart5/>
>
> >> I am not a fan of those. My sister has instant heaters and often you
> >> either get pelted with an arctic shower or boiling water. Ok, that's an
> >> exaggeration but it ain't comfy.
>
> > That's high luxury compared to taking a shower with a rooftop solar
> > water heater.  I got introduced to those in the 1970's in Israel.
> > Israel has lots of sun, lots of rooftops, and isn't insterested in
> > wasting power heating what water it pulls out of the Jordan River.
> > Haifa was literally covered with apartment buildings.  The ground
> > floor was reserved for businesses.  The rest were apartments which
> > were sold, not rented.  Every apartment had its solar water heater on
> > the roof (along with multiple TV antennas at the time) which made
> > things rather crowded.
>
> > Anyway, when you first turn on the water, you get the somewhat warm
> > water that was sitting in the pipes.  About 15 seconds later, you get
> > scalded by maximumly hot, near boiling, water directly from the solar
> > water heater.  That slowly tapers off in temperature as the rooftop
> > heater slowly empties.  I learned to take a shower with one hand on
> > the valves.
>
> > I've done the same with flash water heaters.  They do a somewhat
> > better job of temperature regulation, but without a ballast tank,
> > constant adjustment is required.  Still, it's more energy efficient
> > than a tank type water heater.  Sacrifices must be made.
>
> Most of the stuff sold for residential use is so incredibly crude. I
> mean, what would it take to design an automatic mixer between hot and
> cold? It ain't rocket science and has been done before.

There is no design needed.  You can buy just such a valve already.

http://www.plumbersurplus.com/Prod/Watts-Series-1170-US-M2-Hot-Water-Temperature-Control-Valve-3-4-(0206013)/26805/Cat/254

There's a used one.

>
> [...]
>
> --
> Regards, Joerg
>
> http://www.analogconsultants.com/
>
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