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  • in reply to: convert propane fridge to solar #64627

    I know this is an old post, but I have been looking at this

    myself out of curiosity.

    It sounds like you could collect enough heat energy from solar to run

    the absorption cycle, because you are heating ammonia water under

    pressure, just enough to make the ammonia boil out, but not the water.

    The critical temperature of ammonia is around 271 deg F, so it has

    to be less than that, or the ammonia won’t liquefy at any pressure.

    Here is a reference to a paper on a solar powered heat pump that uses

    the ammonia absorption cycle:

    I didn’t buy the paper cause I am cheap, but there it is.

    I think the main problem in getting it to work practically would be

    some way to “throttle” the energy to provide a consistent, steady

    heat source (like a propane burner) to make the ammonia absorption

    cycle run efficiently. That implies some heat storage/heat exchange

    system. Most storage mechanisms that would store that kind of heat

    would be complicated and bulky, compared to carrying a bottle of propane.

    For a fixed installation, however, it might be doable.

    BTW, this is my first post and I am irritated by the damned Amazon ad

    that floats over and blocks the right side of the posting block in my browser

    (Firefox, Ubuntu Linux, 1024×768 resolution LCD). I am having to manually

    size the width so I can see what I am typing. Hope it is readable.

    in reply to: convert propane fridge to solar #64628

    OK, should have looked some more, a guy has patented the process:

    He uses solar to boil ammonia from ammonia water during the day, to separate out and store up liquid ammonia, then at night he releases the liquid ammonia to perform the refrigeration part by the ammonia turning to gas. Then he runs the gaseous ammonia through water to recover it/absorb it (forming ammonia water) and store it, then the cycle repeats the next day.

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