For the experimenter a look at adsorption refrigeration using activated
carbon fibre and methanol may be an option on an electric boat. The main
reason this is so is a solar panel (not PV) a meter square would be all
that is needed to keep your food cold. At this time I think that it is
a DIY project though.
Kevin Pemberton
On 10/16/2012 02:32 PM, Carter Quillen wrote:
> A vapor compression refrigeration cycle has a coefficient of performance in the 3-5.0 range. That means for every Watt you put in, you will move between 3-5.0 Watts of energy out of the control volume, (refrigerated space).
>
> A Peltier device has a COP between .5-.9. Clearly the vapor compression system is the better choice for efficiency.
>
>
> ________________________________
> From: mattelderca <mattelderca@yahoo.ca>
> To: electricboats@yahoogroups.com
> Sent: Tuesday, October 16, 2012 8:49 AM
> Subject: [Electric Boats] Re: O/B Gear Ratios? + 12V Accessories
>
> 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.masterflux.com/products/cascade/
>
> --- In 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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