a working small (1.4 cu. ft.) dorm style refrig, preferably with grills on the back. $20 to $40 on Craigslist.
Here is an idea i seen awhile back of using a chest freezer with thermostat to regulate temp that is about the easiest ive seen http://mtbest.net/chest_fridge.html
they have directions and such there also
For those of you fortunate enough to own an old Servel refrigerator, you have just such an ammonia absorbtion cycle unit. The first units used a kerosene stove to heat and evaporate the ammonia, later units use electricity to do the same thing.
Jack Shawburn wrote:If you have any elegant solutions I'd like to hear about it.
I'm sure others would too.
My take is that I will just need to have enough PV panels and Battery bank and an Inverter to run a Fridge and Freezer.
Robert Isted wrote:You could use bottles of salt water for thermal mass but from a Thermodynamic point of view beer will work just as well. And beer comes conveniently packaged and can be useful to have on hand in case of unexpected emergencies like a sudden barbecue.
Robert Isted wrote:Why not just keep the fridge inside the freezer? Just be careful that you don’t overpower the system and nothing ought to freeze.
Robert Isted wrote:Refrigeration is the exception where batteries need not be the heart of a solar system. Instead of storing energy chemically in batteries you can use thermal mass to store cooling potential. Minimal battery power might be needed to provide compressor motor startup current and the batteries can be protected with a simple electronic relay system.
Kate Nudd wrote:Here's an idea that I haven't figured out yet.
Radiational cooling occurs when infrared radiation is emitted from an object's surface, causing its temperature to decrease. On a clear night, infrared rays are emitted from the ground into the atmosphere, cooling the air down. This is why the night is extremely cold in the desert. Most people have experienced water's natural convection currents when warm water rises while cold water sinks and pools at the lowest level.
The cooling unit of the refrigerator (capacity 200 litres) is made of metal that has high thermal conductivity. A large volume of water (about 250 litres) is stored around this unit as a coolant. Radiator panels are placed on top so that the inner surface of the panel touches the coolant water. The heat of things stored in the cooling unit is conveyed to the surrounding water by the metal, and the heat goes up by natural convection. Thus it is conveyed to the radiator panel, and emitted through radiational cooling.
The system is most efficient on a clear night when there is less water vapor in the air. One clear night (and sometimes even one cloudy night) every three days can keep the temperature inside the refrigerator at around 7 to 8 degrees Celsius even on a mid-summer day. This innovative refrigerator belies our present-day common sense assumption that things cannot be refrigerated without electricity.
by Yasyuki Fujimura of Non-Electric Atelier
What are the radiator panels made of?
I look forward to other people's thoughts on this one
Erikgreen Hatfield wrote:
Also, I think a chest Frig would be better made from an old vertical frig because they aren't as deep. An old frig, laid on its back and elevated off floor to countertop height would be easier to reach in and retrieve items. They are more prevalent than old freezers and newer ones, better insulated. Also a two door frig would give you a way to separate things. Maybe the small door could be used for beverages, easier to get.