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An insulated tank, fitted with a freely moving frictionless piston, has an initial volume of 1...

An insulated tank, fitted with a freely moving frictionless piston, has an initial volume of 1 m3 and contains 20 kg of refrigerant 134a at 200 kPa. A stirrer with a rotation rate of 300 rpm and a torque of 15 J/rotation is included in the tank. Find the time required for the refrigerant to evaporate completely.

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