1) Lettuce, which is cooled and vacuum packed to be transported to a grocery store, is loaded into a refrigerated vehicle. This journey will take 48 hours. The amount of lettuce loaded is 3000 kg, the temperature in the truck is 2 C, when loaded, the temperature of the lettuce will be reduced to 5 C and 2 C in 2 h. 1st capacity (specific heat) of lettuce is 4.02 kJ/kg "C, total area of truck walls is 80 m, total 1st transfer coefficient for walls is 0.3 W/m C, external temperature is 20 C, and lettuce is between 2 C and 5 C. between C

If the hr emitted by respiration at varying temperatures is 3510 W/kg: a) Write down your assumptions to solve this question.

b) Calculate the total cooling load.