In a rigid tank, water is heated by a Benson burner while being stirred by a pad

Question

In a rigid tank, water is heated by a Benson burner while

being stirred by a paddle wheel. Initially, the internal energy

of the water is 800 kJ. During a heating process of the

Benson burner, the paddle wheel delivers 100 kJ of work

(mechanical energy) during the stirring while 200 kJ of

thermal energy (heat) is dissipated from water to the

surrounding. At the final state, the internal energy of water is

1400 kJ. Please find:

a) Is the volume of this rigid tank going to change during

the heating process?

b) Is this system a closed system or control volume system and explain why

c) List the forms of energy transfer involved in this system

d) The heat transferred from the Benson burner to water during this process?  (Tips: Use

the 1st law of thermodynamics)

Explanation / Answer

parta) no, (it's rigid); partb) It's a control volume as heat is being transferred and also some water particle may have left the system (next anwers in comment)

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