POST 01082E : REFRIGERATOR/FREEZERS PURCHASE AND OPERATING COSTS
Follow-up on Posts 01063E
(http://listes.ulaval.ca/cgi-bin/wa?A2=i ... .org&P=351)
and 01073E
(http://listes.ulaval.ca/cgi-bin/wa?A2=i ... d.org&P=63)
21 April 2007
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The contribution below comes from Alejo Bejemino
(mailto:[email protected]) from the Philippines.
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Would like to share my views on how to prevent
freezing of vaccines in the ILRs.
In my experience with Afghanistan and Pakistan
where the ambient temperature is at extremely
high and low, adjusting the ILRs thermostat to a
lower power setting may help but still does not
completely eliminate the problem of vaccine
freezing. Each setting of the thermostat has a
different range of cut off and cut in
temperatures of the refrigerant compressor for
which only the manufacturer knows about.
We already knew that all EPI vaccines at the
facility or district level which uses ILRs have
to kept at +2° to +8° Celsius. I think it would
be very helpful if the manufacturer of the
vaccine ILRs would consider to redesign the
refrigeration system including the thermostat. It
would be easy for the service provider if the ILR
thermostat has just an on and off position that
is to cut off the compressor at +2° Celsius and
on the compressor at +8° Celsius at varied
ambient temperatures and maximum allowable heat
loads from the vaccines and ice packs.
How about ice pack freezing for outreach
vaccination. This could be handled with a unit
with both refrigerator compartment and freezer
compartment. To freeze the required ice packs the
freezer compartment should have a separate
refrigeration system and a thermostat which does
affect the hold over time of the ILR.
Alejo H. Bejemino
Former Cold Chain Officer, UNICEF Pakistan
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