In North Africa, temperatures can range from 43 deg C in summer to near freezing during the winter. Is this a hot, temperate or moderate zone? Perhaps it would be most beneficial for the purchaser to know at what temperature range the refrigerators will provide proper storage conditions. For example, the range for good vaccine storage may be 15 deg C to 43 deg C. If the unit has a water pack freezer, ice making capabilities could be given at various temperatures. For example, 1.2 kg/day at 15 deg C and 20 deg C, 2.5 kg/day at 32 deg C and 2 kg/day at 43 deg C.
If this hypothetical refrigerator had a 60 liter freezer, PQS specifications require it to make 2.4 kg of ice per day. This unit would fail at 15 deg C and 20 deg C even though it kept the vaccines at the proper storage temperature. The ability of the refrigerator to maintain proper storage temperature at 15 deg C and 20 deg C would not be revealed to the purchaser in the PQS sheet, although this would be a valuable piece of information.
Actual ice making capabilities for that refrigerator will be more closely correlated to the average daily temperatures, not the minimum daily temperature. If daily temperatures varied from 15 deg C to 32 deg C the ice making capabilities may not be diminished. If ice making capabilities were given at different temperatures the purchaser could judge if ice production was adequate. If ice making capabilities are reduced when temperatures are statistically uncommon the consequences would be small. Ice stored in the freezer could make up for temporarily reduced production.
With the performance data suggested here, Mujtaba’s would be able to make a more informed decision on how a refrigerator would perform in Ethiopia’s micro climates.
In summary we suggest the ambient temperature range for which the refrigerator compartment provides safe storage be listed. The ice making capabilities could be measured and presented over the range of temperatures the refrigerator compartment provides safe storage.
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