🚀 go-pugleaf

MooseFET wrote:
> 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.
> 

I know those, they also come within single-lever shower/bathtub control 
valves where you just set a temperture instead of a percentage. I think 
Grohe makes them. But most aren't fast and when you have the situation 
that Jeff saw in Israel the water coming through the pipes can turn from 
barely warm to scalding in milliseconds. Unless you have a point-of-use 
recirc but most houses are not that modern.

-- 
Regards, Joerg

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