A large truck is to transport 30,000 Kg of orange pre-cooled to 4oC

In summary, the refrigeration load of the truck is determined by the rate of heat transportation, estimated air flow rate, and heat of respiration of the oranges. Using the 1st Law of Thermodynamics and considering the conservation of mass, the necessary properties can be looked up from a table to calculate the refrigeration load and amount of ice needed for the 15-hour trip.
  • #1
fhoseinuk
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A large truck is to transport 30,000 Kg of orange pre-cooled to 4oC under average temperature of 27oC. The structure of the walls of the truck is such that the rate of heat transportation is UA=80W per oC temperature difference between the ambient and the oranges. From past experience, ambient air is estimated to enter the cargo space of the truck through the cracks at a rate of 4L/s. Also, the average heat of respiration of the oranges at 4oC is 0.017W/kg for this particular load. Disregarding any condensation and taking the density of air to be 1.15kg/m3, determine the refrigeration load of this truck and the amount of ice needed to meet the entire refrigeration need of the truck for a 15hour trip.

Can you help me on figuring out how to start this question?
 
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  • #2


The 1st Law of Thermodynamics is always a good place to start. Use the volumetric flow rate of the air and its density to figure out the mass flow rate, then look up the necessary properties from the appropriate table. Keep in mind conservation of mass though, if this is a steady state problem then equal amounts of mass will enter and leave the system.
 

Related to A large truck is to transport 30,000 Kg of orange pre-cooled to 4oC

1. How much weight can a large truck typically carry?

A typical large truck can carry up to 40,000 Kg of weight, but it may vary depending on the truck's specific size and capacity.

2. How does pre-cooling affect the transportation of oranges?

Pre-cooling the oranges to 4oC helps to maintain their freshness and quality during transportation. It slows down the ripening process and prevents the oranges from spoiling quickly.

3. Why is it important to transport the oranges at a specific temperature?

Oranges are sensitive fruits and can easily spoil if not stored and transported at the right temperature. Pre-cooling the oranges to 4oC helps to prevent bacterial growth and maintain their freshness throughout the journey.

4. How many oranges can fit in a truck with a capacity of 30,000 Kg?

The number of oranges that can fit in a truck with a capacity of 30,000 Kg depends on the size and weight of the oranges. On average, a large truck can transport approximately 30,000-40,000 oranges.

5. What are the potential challenges of transporting 30,000 Kg of oranges?

Some potential challenges of transporting 30,000 Kg of oranges include maintaining the required temperature, avoiding damage to the fruits during loading and unloading, and ensuring timely delivery to prevent spoilage. Proper planning and preparation are crucial to overcome these challenges.

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