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Posted by kool on October 19, 2007, 7:42 pm
>
>>
>> > Has anyone tried this refrigerant yet? I am considering it for some
>> > heat
>> > recovery chillers and looking for input. MO29(R-422D),MO59(R-417A) and
>> > MO79(R-422A) are all listed as R22 replacements..Why is Dupont
> developing
>> > more than one ISCEON replacement for 22?Why is 410 the manufacturers
>> > choice for new equipment over these other HFC replacements?
>> > http://www.refrigerants.dupont.com/Suva/en_US/products/isceon29.html
>>
>> Check with the compressor manufacturers... the big problem is not the
>> refrigerant, but whats *IN* the blend...namely Butane.
>>
>> Think FLAMMABLE and EXPLOSION HAZARD in resi and light commercial
>> applications.
>> This is according to the Copeland rep that dropped by the class I was in
>> last night.
>
>
> I have heard both sides of this conversation.
>
> Butane is a flammable/explosive gas.
> But, they say that isn't a concern when used in refrigerants, as the
> mixture
> and combination to get a combustionable flame is almost none existent.
> Components
Material CAS Number %
1,1,1,2-Tetrafluoroethane 811-97-2 31.5
Pentafluoroethane 354-33-6 65.1
Isobutane 75-28-5 3.4
This product is not flammable in air at temperatures up to
100 deg. C (212 deg. F) at atmospheric pressure. However,
mixtures of this product with high concentrations of air at
elevated pressure and/or temperature can become combustible
in the presence of an ignition source. This product can
also become combustible in an oxygen enriched environment
(oxygen concentrations greater than that in air). Whether a
mixture containing this product and air, or this product in
an oxygen enriched atmosphere becomes combustible depends on
the inter-relationship of 1) the temperature 2) the
pressure, and 3) the proportion of oxygen in the mixture. In
general, this product should not be allowed to exist with
air above atmospheric pressure or at high temperatures, or
in an oxygen-enriched environment. For example: This
product should NOT be mixed with air under pressure for leak
testing or other purposes.
Experimental data have also been reported which indicate
combustibility of HFC-134a, a component in this blend, in
the presence of chlorine.
I think I answered my own question about why the choice for manufacturers is
R-410.All the other replacements have a much lower discharge temperature
making them not as good as R22 for heating applications eg. heat pumps or
heat recovery chillers etc.
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