And I hope any discussions that take place, take place here. I'm pretty good with basic understanding of mechanical things, but not so much electrical. I am sure I could learn much from the discussions.
The solar powered fridge idea is intriguing. A recipe including parts suppliers might result in a few people building them, and reporting back.
I gave up on refrigeration as too expensive on power and space aboard my small boat. Instead I have three pressure cookers. Having been brought to pressure the contents will keep a couple of days within the still closed cooker. Things brought to pressure daily will keep indefinitely. I can also use the pressure cookers to can fresh food, if I am supplied with more than I can eat right away. However, a solar thermal refer might very well be worth trying. If not super insulated it would take up much less space and a place might be found for it.
Eric
--- In electricboats@yahoogroups.com, donald bland <dlblandjr@...> wrote:
>
> very interesting and excellent replies Mr. Pemberton , I have read your
> solutions and ideas with increasing interest and I would personally enjoy to be
> able to chat you up and discuss various silly ideas in engineering with you at
> some point , as if you are not a P.E. you certainly have a fine understanding of
> the relationship of physics to our sailing world , or world in general, I value
> and appreciate that and thus would endeavor to come into contact and exchange
> ideas with you sir at reasonable and regular periods.
> Donald L. bland jr ( dlblandjr@...)
>
>
>
>
>
> ________________________________
> From: Kevin Pemberton <pembertonkevin@...>
> To: electricboats@yahoogroups.com
> Sent: Thu, October 18, 2012 3:03:20 PM
> Subject: Re: [Electric Boats] Re: O/B Gear Ratios? + 12V Accessories
>
>
> 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@...>
> > 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
> >l
> >
> > 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.
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> > http://docs.yahoo.com/info/terms/
>
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