I had an idea while back. To take a 275 gal oil tank. Cause they
are often free for the taking. Use an AC during the night to chill
the contents (oil, or perhaps water). Using an evaporator within
the tank. Insulate the tank, of course.
Daytime, either circulate the cold water through radiators with
fans, or use another AC with the condensor in the tank.
That way, you'd be moving the BTUs outdoors at night when
it's colder, and the unit wouldn't work as hard.
Seems like it would save money, dumping the heat at night.
The losses of the 2nd exchange process would outweigh your savings
during the day. The better solution is geo thermal which involves
about the same level of complexity in the system as what you are
On Thu, 17 Jun 2010 05:56:27 -0700 (PDT), jamesgangnc
It's called thermal banking.
If you want to go around taking used oil tanks of people's
hands, I'm sure you'll be very popular. Usually they pay thousands to
get rid of them, since they are considred to be hazardous waste. Will
one fit in or on your Pinto ?
Have you bothered to figure out how much cooling capacity you
could store in one ? I'm sure you haven't.
What temperatures do you think you're going to run it at ?
Have you even thought about that ? How warm will you allow it to get
during the day ? How cold will you pull it down at night ? How will
you convince a high-temp refrigeration cycle system to do that ?
How are you going to get your coil in the tank through that
little 2 inch hole ? How are you going to circulate the water past it
Unless you're on a time-of-day metering plan, which I'm sure
Click here every day to feed an animal that needs you today !!!
Moving the heat the second time, that's a concern. I wonder if it's
possible to AC using chilled water or glycol. I've heard that's done
in large buildings. If it were practical, someone would do it already.
You can use Fluorocarbon 75 or Fluorocarbon 77. Both stay liquid and
have enormous capabilities of transferring heat and cold. You may have
to sell your pinto to buy this stuff though. It ain't cheap. You might
be able to siphon some of this out of the odd F16 weapons system though.
Systems already exist commercially. It's an insulated box with
lines going through it to freeze the water at night when the
cost of power is lower. They work well in places where the
price of power is determined by the time of day and demand.
Years ago a university built a giant ice bank under the campus
that basically produced a giant iceberg during the winter months
and during the summer they would dump heat back into it. It was
described in one of the Popular Science/Mechanics magazines.
I'm sure there's a lot of data online about the efficiency of
There use to be a fellow from one of the Canadian Islands that had a
dugout filled with large plastic barrels of water. He left both ends
open year around. In the winter the things froze solid and in the summer
,when it got too hot he opened the downwind side to allow the frozen air
to drift through the house. He posted here about once a week due to
thats the only time he ran a generator. That was back when this group
was full of piss and vinegar. Now the vinegar is gone. ;-)
There are lots of good ideas like this out there.
Few of them work well in residential. At work we just installed a
system with a cooling tower, a water loop through the building, and
individual water-to-air heat pumps in the spaces. We'll see how it
works over time.
One idea that should work in residential with minor modifications is
to use the waste condenser heat to produce domestic hot water. You're
paying to move all that heat outside your house, then you throw it
away, while you pay more to heat water for your showers and laundry.
Hot water should be free for anybody with AC.
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