Craig
I would be interested in more detail to your Peltier unit,
Aaron
From: Craig Carmichael <craig@saers.com>
To: electricboats@yahoogroups.com
Sent: Wednesday, October 17, 2012 10:49 PM
Subject: [Electric Boats] Re: 12V Accessories (Refrigeration)
To: electricboats@yahoogroups.com
Sent: Wednesday, October 17, 2012 10:49 PM
Subject: [Electric Boats] Re: 12V Accessories (Refrigeration)
That's quite interesting. The internet is sure great for finding out
about new things you've never heard of before!
I guess it's my electronics background (and dislike of
compressor/fridge noise) that lead me instead to the Peltier idea. I
did realize I was going for simplicity at the cost of operating
efficiency. It would be a considerable learning curve for me to do a
compressor based system unless they're made as ready to install
units. Basically, I wouldn't have taken the project on. (For
efficiency I'd like to try the magnetic refrigeration idea, because
it's pretty much unexplored and potentially pretty quiet.)
Let's see, to make my Peltier cooling unit "from scratch" (without
all the detours I took doing a first prototype) would have cost...
15 - Peltier device
5 - fan
10 - Al to make heatsink
10 - Al for inner chest
--
Well, allowing for whatever, call it 50-75$ or so?
So... any idea what a small 12v compressor based cooling (or heating)
unit might cost to put together? I looked for compressor based
ductless heat pumps recently, and under "ordering" they all (large or
small) link to "find an installer near you", which seems discouraging
for a DIYer.
Craig
=====
>In regards to refrigeration, lots of people have made their own.
>There are some very efficient DC compressors out there to employ in
>this. 12 to 24 volt BLDC compressors are available that can be used
>in just about any size refrigerator/ freezer. Commercially available
>ones are usually around 14 cubic feet. These refrigerators will run
>24/7/365 off of any 150 watt solar panel and matching battery.
>Current consumption at 12 volts is only around 2.4 amps at full load.
>In a well insulated enclosure these would be much more efficient
>than a junction device. And they are available for alternative/HC
>refrigerants as well.
>More info below,
>
><http://www.danfoss.com/Products/Categories/Group/RA/Compressors/Direct-Current-Compressors/b44e7573-473b-4dba-90c2-431ffccf0b9c.html>http://www.danfoss.com/Products/Categories/Group/RA/Compressors/Direct-Current-Compressors/b44e7573-473b-4dba-90c2-431ffccf0b9c.html
>
><http://www.masterflux.com/products/cascade/>http://www.masterflux.com/products/cascade/
>
>--- In
><mailto:electricboats%40yahoogroups.com>electricboats@yahoogroups.com,
>Craig Carmichael <craig@...> wrote:
>>
>> Thanks for the responses!
>>
>SNIP
>I'm really in this to create renewable energy things myself*,
>
>SNIP
>>
>> Cheers,
>> Craig
>>
>> * As an example of how one thing can lead to others... people told me
>> that Peltier elements were too inefficient for anything more than a
>> small camping cooler -- not worth thinking about for a fridge. If I'd
>> taken that advise, nothing would have been achieved. But here's three
>> things that have arisen from the experiment:
>>
>> -- I'm the only person I know who has ever made a home made fridge.
>> It does use 1/2 as much electricity for only 1/3 the cubic space of
>> my regular fridge in spite of 3" of foam insulation - but it works
>> and it's 12 volts. And with a freezing/melting ice chest to store and
>> release coldness, plus when I've done the "smart control", it'll run
>> mainly in the day when the solar panels are making the electricity.
>> If I hadn't explored it, the ideas for making it practical and for
>> reducing battery energy storage requirements to run a fridge wouldn't
>> have come to light.
>
>
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