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QUESTION 1). A person staying in a caravan on a hot day decides to close the...

QUESTION 1). A person staying in a caravan on a hot day decides to close the door and run the fridge with its door open to cool the interior down. Briefly explain if this will help and why.                 

QUESTION TWO)

A large hot water tank is maintained at a constant temperature of 70°C by a counter flow heat exchanger coil containing hot water. The heating coil has an outside diameter of 30mm and U=4500W/m2K. The water enters the heating coil at 95°C and leaves at 75°C. The heat transfer rate required is 40kW.

  1. Sketch the temperature profile of the heat exchanger                                 (1 mark)
  2. Calculate the mass flow rate of water through the heating tubes in kg/min.( 2 marks)
  3. Calculate the length of heater tube required.                                              

PLEASE ANSWER BOTH THE QUESTION PLEASE

Engineering   Mechanical-Engineering   
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