ISTA Views

JANUARY | 2018

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ista views • December 2017/January 2018 • www.ista.org Temperatures During Transport Between Europe, China, Africa and USA: Data and Predictive Model > CONTINUED FROM PAGE 17 18 PREDICTIVE MODEL Based on the previous measurements, a study has been conducted to predict the inside truck temperature profile, as a function of the outside air temperature profile. Inside truck temperature profile = f(Outside temperature profile) Outside air temperature profile is a function of time, weather and geography. At the same latitude, the minimum and maximum outside temperatures are reached at the same time every day. In order to simplify the model, the outside temperature profile of one day was described by its minimum and maximum temperature reached during the day. Inside truck temperature profile is a function of outside air temperature, measured location in the truck, amount of product, type of product, time of the day, insulation of the truck, etc. To simplify the model, the inside truck temperature profile for 24 hours was described as a function of the time during the day, minimum and maximum outside air temperature of the day. Temp Truck = f(t,Min Air ,Max Air ) Where: t=time during the day Min Air = Minimum outside air temperature of the day Max Air = Maximum outside air temperature of the day Temp Truck = Temperature inside the truck at a time t 67 72 77 82 87 92 97 102 107 112 12:21:28 AM 1:21:28 AM 2:21:28 AM 3:21:28 AM 4:21:28 AM 5:21:28 AM 6:21:28 AM 7:21:28 AM 8:21:28 AM 9:21:28 AM 10:21:28 AM 11:21:28 AM 12:21:28 PM 1:21:28 PM 2:21:28 PM 3:21:28 PM 4:21:28 PM 5:21:28 PM 6:21:28 PM 7:21:28 PM 8:21:28 PM 9:21:28 PM 10:21:28 PM 11:21:28 PM FW Top Pallet FW Oustide trailer Inside truck Outside air temperature 14h 3h 7h 19.4 °C 25.0 °C 36.1 °C 30.6 °C 41.7 °C B A C Figure 6 – Description of the inside temperature profile function of the outside air temperature profile. 3 main areas can be identified in the pattern: A (Temperature increase from minimum to maximum); B (temperature is stable at the maximum); C (temperature decreases to the minimum).

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