<p><br>
On Jun 14, 2011 9:45 AM, "John Hearns" <<a href="mailto:hearnsj@googlemail.com">hearnsj@googlemail.com</a>> wrote:</p>
<p>> Freon yes.<br>
> Also liquid carbon dioxide if anyone is interested - google fro a<br>
> company called Trox.</p>
<p>Vapour phase CO2 refrigeration is nothing new and is in wide use across the refrigeration industry, as is use of ammonia. </p>
<p>There is a legislation led drive away from CFCs towards use of CO2 in industrial cooling, due to concern over the effects of the former on the ozone layer. However, if you speak to an industrial design engineer they can give you a number of reasons why this is pretty shortsighted.</p>
<p>Cheers,</p>
<p>Andrew<br></p>
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