<VV> A/C Usage Re: Corvair Miles

[jvhroberts at aol.com]

 In fact, there's no amount of pressure that'll liquefy air at our temperatures. The critical temperature is just too lofe. 

But air is quite compressible, and Boyle's gas law works quite well here. However, as you point out, the lack of a phase change does limit things, or requires huge amounts of refrigerant flow to get the desired level of cooling. 

 

John Roberts
 

 

-----Original Message-----
From: Joel McGregor <joel at joelsplace.com>
To: VirtualVairs <VirtualVairs at corvair.org>
Sent: Wed, Sep 19, 2012 11:37 am
Subject: Re: <VV> A/C Usage Re:  Corvair Miles


Air is a very poor refrigerant because it is relatively incompressible (requires 
too much pressure to become a liquid).  This property is what refrigerant 
recovery machines use to separate air from refrigerant.  They pressurize the 
air/refrigerant mixture until the refrigerant liquefies and then bleed off the 
air which is still a gas.  The phase change in refrigerants is where we get the 
majority of the heat transfer.  Remember latent heat of evaporation.
http://en.wikipedia.org/wiki/Latent_heat
Joel McGregor
________________________________________
From: virtualvairs-bounces at corvair.org [virtualvairs-bounces at corvair.org] On 
Behalf Of Ron [ronh at owt.com]
Subject: Re: <VV> A/C Usage Re:  Corvair Miles

"and, as we  know, AIR is a rather poor refrigerant"

No, it works OK!  Remember the ROVAC system that was supposed to
revolutionize automotive AC systems?  It worked alright but they couldn't
solve the noise problem with the compressor.  If they can ever make a quiet
air compressor we may yet see air as an automotive AC refrigerant.
RonH
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