[TheForge] Refrigerator compressor/motors

[Walter L. Mullett]

Ammonia absorption units are still being used.... check out the gas powered 
refrigerator in your RV.

----- Original Message ----- 
From: "GHS" <ghs at execpc.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Thursday, November 04, 2004 10:06 AM
Subject: Re: [TheForge] Refrigerator compressor/motors


>
>
> Dave Brown wrote:
>
>>
>> Why?  Or should I ask how?
>
>  No heat,
> Other than the motor and the ever present possibility of spark generation. 
> Ever lay your hand on a compressor that was not being cooled by a flood of 
> refrigerant?
>
>  no oxygen,
> I am assuming this would not be a permanent rig. As you would be 
> connecting and reconnecting this, and it would not as a whole be 
> permanently flooded, I would not be so sure about no oxygen.
>
>  propane will liquefy
>> under pressure, compressor is already designed for compressing a gas 
>> (freon) to liquid state at pressures comparable to propane.
>
> Propane was once used in this country as a refrigerant. Still is in some 
> places. I believe it was belt driven compressors, no windings in the gas 
> flow.
>
> Ammonia was used also.
>
> The problems with these were LP could explode and pure ammonia kills you 
> outright.
>
> The Freon type refrigerants were designed around finding a non explosive 
> (essentially non flammable) non poisonous substitute. Keep in mind that 
> given sufficient heat you can burn Freon into phosphoric acid and 
> phosgene. This the reason that being careful with the gases and oils from 
> a burnt out compressor is a GOOD idea. Freon also will not support life if 
> there are sufficient quantities.
>
> Even with that it is still much safer given the original concerns.
>
> While IN THEORY you are correct. Positing a totally oxygen free 
> environment and a perfectly running compressor, you probably could get it 
> to work , it is the wrong compressor for the job.
>
> I have not had an opportunity to check the pressure temperature curves for 
> LP but at normal atmospheric temps you might have a problem generating 
> sufficient pressure to liquefy the LP.
>
>> I'm not trying to be a smartass, Mike.  I was just looking for answers 
>> longer than one word or that had a positive bent to them.
>
> Dave not blowing you into little pieces and launching your shop into the 
> bay IS a positive bent , from my perspective.
>
>> Dave Brown
>> Heritage Smithing
>> Green Bay, WI
>>
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