Posted by Jim Wilkins on May 18, 2012, 1:42 am
> On 5/17/2012 9:29 AM, Jim Wilkins wrote:
>> ...>
> I have an antenna for TV and dial-up
>> internet, which save over $00 a month vs cable.
> Yikes. Dial Up? Over the air TV is good enough though. I'm
> completely on board with the "solar" clothes dryer.
Clothes really do dry on the line in the middle of winter, just like
the pavement does.
Dial-up is fine for Usenet.
>> ...to see if
>> nighttime venting is worthwhile when the humidity is high.
> What kind of indoor/outdoor humidity spreads do you get? Humidity
> here can soar early morning in the summer.
Summer in the Boston area sees dewpoints up to ~70F, with daytime
highs pushing 100F, if the weather comes from the southwest. Canadian
breezes are much more pleasant. Winter is the reverse, we get subzero
Hudson's Bay weather sometimes, but not this past one.
jsw
Posted by News on May 18, 2012, 12:15 pm
j wrote:
>> Germany never had more than a small fraction of the US and British
>> ability to project power overseas, they expected and planned for a
>> short, local land war. They had more trouble moving supplies by road
>> and rail across Russia than we did shipping them half way around the
>> world.
>
> Yes. Poor Russian roads killed Barbarosa. The Germans got a late start
> due to having to bail out their Italian allies in Greece and then the
> season without roads struck and ground everything to a halt.
The Germans never had a cat in hell's chance of winning WW2.
Posted by j on May 18, 2012, 5:02 pm
On 5/18/2012 8:15 AM, News wrote:
> j wrote:
>>> Germany never had more than a small fraction of the US and British
>>> ability to project power overseas, they expected and planned for a
>>> short, local land war. They had more trouble moving supplies by road
>>> and rail across Russia than we did shipping them half way around the
>>> world.
>>
>> Yes. Poor Russian roads killed Barbarosa. The Germans got a late start
>> due to having to bail out their Italian allies in Greece and then the
>> season without roads struck and ground everything to a halt.
> The Germans never had a cat in hell's chance of winning WW2.
They could well have won had they not attacked Russia. The British Army
was no match. For that matter, if the Russians hadn't bled the Germans
the Western Front may have held.
http://en.wikipedia.org/wiki/German_casualties_in_World_War_II
The Japanese never had a chance. And if the Japanese hadn't attacked the
US, the US may never have put any troops in.
The German armor, planes and Wehrmacht were first rate.
Jeff
Posted by News on May 17, 2012, 8:49 am
j wrote:
> On 5/16/2012 1:34 PM, danny burstein wrote:
>> writes:
>>
>>>> http://en.wikipedia.org/wiki/Supercapacitors
>>
>>> Look under Disadvantages:
>>> http://en.wikipedia.org/wiki/Electric_double-layer_capacitor
>>
>>> One decent 2500mA-Hr AA NiMH has the same current storage capacity
>>> as 9,000 Farads of supercapacitor.
>>
>>> http://en.wikipedia.org/wiki/Capacitance
>>> A 1 Farad supercapacitor discharges by 1 Volt while supplying 1 Amp
>>> for 1 Second. The battery will nominally deliver 1A at 1.2V for 2.5
>>> <HOURS>.
>>
>>> They are valuable only if they can match the size, weight and volume
>>> efficiency of Lithiums at a much lower price.
>>
>> They are right-at-the-edge of being practical for
>> the "peak shaving", so to speak, uses. For example,
>> when you're decelerating your car via motor-generator,
>> you're producing way too much power for transfer
>> into a battery. But if you could dump that electricity
>> over to a supercap, and then slowly feed it to
>> the battery, it almost works.
>
> That's my take on it too. I think though, that you don't have to feed
> it back, but use it for the next acceleration.
This is being used for urban stop-start trains.
Posted by News on May 17, 2012, 8:44 am
danny burstein wrote:
> writes:
>>> http://en.wikipedia.org/wiki/Supercapacitors
>> Look under Disadvantages:
>> http://en.wikipedia.org/wiki/Electric_double-layer_capacitor
>> One decent 2500mA-Hr AA NiMH has the same current storage capacity as
>> 9,000 Farads of supercapacitor.
>> http://en.wikipedia.org/wiki/Capacitance
>> A 1 Farad supercapacitor discharges by 1 Volt while supplying 1 Amp
>> for 1 Second. The battery will nominally deliver 1A at 1.2V for 2.5
>> <HOURS>.
>> They are valuable only if they can match the size, weight and volume
>> efficiency of Lithiums at a much lower price.
> They are right-at-the-edge of being practical for
> the "peak shaving", so to speak, uses. For example,
> when you're decelerating your car via motor-generator,
> you're producing way too much power for transfer
> into a battery. But if you could dump that electricity
> over to a supercap, and then slowly feed it to
> the battery, it almost works.
R&D is being done right now on battery-supercap setups. Only hydraulic
accumulators can store most kinetic energy (90% plus) and give it back off
immediately. Chrysler with the EPA are developing a test minvan using this
hydraulic technology.
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>> ...>
> I have an antenna for TV and dial-up
>> internet, which save over $00 a month vs cable.
> Yikes. Dial Up? Over the air TV is good enough though. I'm
> completely on board with the "solar" clothes dryer.