EVENTS AND EXHIBITIONS |
INCORPORATING COLD CHAIN |
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rate of moisture loss due to respiration when the grape is harvested at 30 ° C and when cooled to 2 ° C . Moisture loss is evident in a loss of grape mass and it will impact on the quality at the end of the distribution chain .
The quality of product stems from the vineyard , while even the most
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tunnels . The mix of temperatures was illustrated with infra images taken by CoolCheck . Until the pallets are all at a similar temperature , a transfer of heat and different rates of respiration will occur , impacting on the overall time taken to cool all the grapes to a temperature below 2 ° C . With such vast differences in the intake temperatures , the possibility exists that some of the inner portions of the cartons will not be cooled to the required temperature . |
Sorting of pallets according to outside temperatures and then placing those with similar temperatures in the tunnels was recommended to reduce overall cooling times .
Icing up of evaporators with the resultant decrease in cooling capacity and short cycling of air between suction and tunnel fans , were other influencing factors referred to by Schlemmer and Van Zyl .
CoolCheck also made an interesting
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observation in that the volume of air flowing through the grape cartons at Hexkoel was less than the average measured in the Orange River table grape production area . Cooling times in the Orange River were less , but so was the volume of pallets per tunnel compared to Hexkoel .
There was keen interest in the refrigeration presentation , which added value to a well-presented and informative seminar by The Grape Company . CLA
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effective refrigeration and |
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cold chain can merely |
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maintain the quality as |
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harvested . |