POST 00638E : FROM HFC/CFC TO HC-BASED REFRIGERATION
18 February 2004
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It appears that two of previous postings were not received. The first of
these was a survey reminder that it is too late now to repost. The other is
the following. My apologies for this mishap !
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POST 00636E : FROM HFC/CFC TO HC-BASED REFRIGERATION
Follow-up on Posts 00487E, 00493E, 00500E, 00513E and 00634E
7 February 2004
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Michel Zaffran (mailto:[log in to unmask]) comments here below on the
question of HC refrigeration.
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I agree with Terry's suggestion that HC be now considered as acceptable
refrigerants for Vaccine cold
chain equipment It should be noted that the reason HC were excluded at the
time (mid 90's)was that very little information and experience was
available on the safety of HC in refrigerators and particularly with
regards to repair technicians handling. The preferred refrigerant at that
time was R134a.
It appears that that the experience has now been accumulated and that the
risks related to the
inflammability of HC are negligible given the relatively small amounts of
HC contained in vaccine
refrigerators.
It is a good idea that this issue be discussed at TechNet. The agenda does
not really have room for this
at the moment but one could imagine a small satellite working group meeting
to discuss the next
steps for this at any rate all specifications for cold chain equipment will
be revised as part of the move
from the PIS to the PQS (which will be discussed at the TechNet consultation).
regards
Michel
Michel Zaffran
Coordinator, Access to Technologies
Immunization, Vaccines and Biologicals Department
Family and Community Health
World Health Organization
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