Tute1 - Thermodynamics 1 Tutorial 1 Introduction Energy and the First Law Question 1 A composite plane wall consists of a 0.25 m thick layer of brick

Tute1 - Thermodynamics 1 Tutorial 1 Introduction Energy and...

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Thermodynamics 1 Tutorial 1 Introduction, Energy and the First Law
Question 1 A composite plane wall consists of a 0.25 m thick layer of brick k b =0.72 W/m.K and 0.1 m thick layer of insulation k i =0.072 W/m.K. The outer surface temperatures of the brick and insulation are 395K and 300K respectively and there is perfect contact at the interface between the two layers. Determine at steady state the instantaneous rate of conduction heat transfer in W/m 2 of surface area, and the temperature in K at the interface between the brick and the insulation.
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Unformatted text preview: Air contained in a vertical piston-cylinder assembly by a piston with a mass of 50 kg and having a face area of 0.01 m 2 . The mass of the air is 4 grams and initially the air occupies a volume of 5 L. The atmosphere exerts a pressure of 100 kPa on the top of the piston. Heat transfer of magnitude 1.41 kJ occurs slowly from the air to the surroundings, and the volume of the air decreases to 0.0025 m 3 . Neglecting friction between the piston and the cylinder wall, determine the change in specific internal energy of the air, in kJ/kg....
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• Thermodynamics, Heat, First Law, brick kb=0.72 W/m.K, insulation ki=0.072 W/m.K, composite plane wall

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