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  3. a 140litre container is to be used to store heat f

A 140litre container is to be used to store heat for a domestic heating system. There...

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Mechanical Engineering

A 140litre container is to be used to store heat for a domesticheating system. There are two options for the storage material,lead blocks or clay bricks. Using the data provided determine whichis the best option for thesystem.                                                        

Lead: specific heat 130J/kgK, density 11340kg/m3

Brick: specific heat 840kJ/kgK, density 2000kg/m3

2. A container holds 0.25m3 of compressed airat 900kPa and 20°C. This is expanded polytropically via a processwith n=1.3 to a pressure of 150kPa. Determine;        

(2 marks each)

  1. The mass of air
  2. The final air temperature
  3. The work transfer, stating if it is input or output work
  4. The change in internal energy
  5. The heat transfer , stating if this is heat input oroutput

please answer both the questions/

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