QUESTION 4 (b) (c) Define the meaning of a critical point and triple point. Hairdryer is an electromechanical device tha

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Question 4 B C Define The Meaning Of A Critical Point And Triple Point Hairdryer Is An Electromechanical Device Tha 1 (39.96 KiB) Viewed 22 times

QUESTION 4 (b) (c) Define the meaning of a critical point and triple point. Hairdryer is an electromechanical device that blows ambient or hot air over damp hair to speed the evaporation of water to dry the hair. To design a hairdryer, it should contain the following basic components: a duct of constant diameter with a few layers of electric coils, a small fan to pull the air in and force it through the heating coils. If the density of air is 1.18 kg/m³ at the inlet and 0.90 kg/m³ at the exit, calculate the percent increase in the velocity of air as it flows through the dryer. (i) Determine the final pressure and temperature of nitrogen. A piston-cylinder device contains 1.5 kg of nitrogen initially at 100 kPa and 17°C. The nitrogen is now slowly compressed in a polytropic process during which PV¹³ = constant until the volume is reduced by one-half. (ii) Calculate the work input. (iii) Determine the heat transfer output. [C1, SP1][2 marks] (iv) Show the process on a P-V diagram. (v) Propose TWO (2) assumptions for this polytropic process. [C4, SP2][4 marks] [C4, SP3][4 marks] [C4, SP4][5 marks] [C4, SP4][5 marks] [C4, SP4][3 marks] [C5, SP3][2 marks]