Is a Human-Powered Refrigerator Feasible for Off-Grid Living?

In summary, this project would require a lot of human power to run, and the energy generated would not be enough to justify the effort.
  • #1
neilmkearns
2
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I make human powered machines for offgrid living and have been getting ready to start on a human powered fridge. The idea is to use a deep freezer and replace the compressor with an automotive one, and connect the shaft to pedals (might require two riders).

1) Are the freon types compatible?
2) Are the pressures compatible, or the compressor modify-able?
3) Due to the surplus power, would like to charge up a large pressure tank of coolant to circulate and cool the system after riding for say 5 minutes.

Any thoughts smart guys/gals?

thanks for any insights into this!
 
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  • #2
If it was me, I would rethink that power source. Humans basically working out on treadmills in order to keep said food cold are going to consume a lot of the said food. Not good for a survival point either- you need to be able to do other things yes?

As far as I know the freon is not compatible either, not sure if the lines would need changing or not? They have different viscosity so the port sizes are what matter I think, to avoid any plugs.

Those systems don't like start/stop conditions either.. So human power is going to be very uneven.

Assuming a creek is nearby, you could have cold water being pumped through the unit to minimize work on the cooling system. Then run a 12v compressor or belt drive an automotive one whenever the temperature rises too much?
 
  • #3
http://michaelbluejay.com/electricity/refrigerators.html
let's say a fridge uses 200 KwH of power (a very generous rounding)

one joule/second = 1 watt
1000*60*60 j/s = 1 kwh
a 200 kwH fridge needs 1000*200 kw every hour. that's 1000*200/(60^2) = 55 joules/second

http://mapawatt.com/2009/07/19/bicycle-power-watts/
let's say an out-of-shape cyclist can generate 200 watts
that's 200 joules/second

you'd have to ride 6 hours/day to run the fridge (assuming you have a flywheel, or battery, or something harnessing the spare energy)
i guess 3 hours in the morning, and 3 hours before bed seem feasible
it'll probably be closer to 8 hours/day
 
  • #4
Liked the idea but as the above two posters said, the amount of energy to be put in by humans hardly justifies its feasibility.
 

1. What is a human-powered refrigerator?

A human-powered refrigerator is a type of refrigerator that does not require electricity to function. It is powered by human energy, such as pedaling, cranking, or hand-operated mechanisms.

2. How does a human-powered refrigerator work?

A human-powered refrigerator works by using the energy from the human body to power a mechanical system that cools the interior of the refrigerator. This can be achieved through various methods, such as a hand crank or a pedal system.

3. What are the benefits of a human-powered refrigerator?

There are several benefits to using a human-powered refrigerator. Firstly, it is environmentally friendly as it does not require electricity to function. It is also cost-effective as it eliminates the need for electricity bills. Additionally, it can be used in areas with limited access to electricity, making it a valuable tool for developing countries.

4. How long can a human-powered refrigerator keep food cold?

The length of time a human-powered refrigerator can keep food cold depends on various factors, such as the outside temperature, the amount of ice used, and the size of the refrigerator. Generally, it can keep food cold for several hours to a few days.

5. Are there any limitations to using a human-powered refrigerator?

One limitation of a human-powered refrigerator is that it requires human energy to operate, so it may not be suitable for individuals with physical limitations. Additionally, it may not be able to cool food as efficiently as an electric refrigerator. It also has a limited storage capacity compared to traditional refrigerators.

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