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Determine the mass of the air. W - Show that u2 = U₁ (where W is the work. Remark: Q can be neglected). m Determine W. (Remark: as the work is done on the system, it should be negative) Determine u2. If T₂= 81 °C, Calculate the final pressure.

Determine the mass of the air. W - Show that u2 = U₁ (where W is the work. Remark: Q can be neglected). m Determine W. (Remark: as the work is done on the system, it should be negative) Determine u2. If T₂= 81 °C, Calculate the final pressure.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A fan drawing electricity at a rate of 1.5 kW is located within a rigid enclosure. The length, width and height of the enclosure are respectively equal to 5 m, 4 m, and 3 m. The enclosure is filled with air initially at T₁ = 27 °C, P₁ = 0.1 MPa and u₁ = 214.07 kJ/kg. The fan operates steadily for 30 minutes. 3 m Assuming the ideal gas Fan model. (a) Determine the mass of the air. W kJ kmol.k Assume R = 8.314; 5m (b) Show that U2 = U₁ - (where W is the work. Remark: Q can be neglected). m (c) Determine W. (Remark : as the work is done on the system, it should be negative) (d) Determine u₂. (e) If T₂= 81 °C, Calculate the final pressure. 4 m and the molecular weight of the air is 28.97 kg/kmol.
Transcribed Image Text:A fan drawing electricity at a rate of 1.5 kW is located within a rigid enclosure. The length, width and height of the enclosure are respectively equal to 5 m, 4 m, and 3 m. The enclosure is filled with air initially at T₁ = 27 °C, P₁ = 0.1 MPa and u₁ = 214.07 kJ/kg. The fan operates steadily for 30 minutes. 3 m Assuming the ideal gas Fan model. (a) Determine the mass of the air. W kJ kmol.k Assume R = 8.314; 5m (b) Show that U2 = U₁ - (where W is the work. Remark: Q can be neglected). m (c) Determine W. (Remark : as the work is done on the system, it should be negative) (d) Determine u₂. (e) If T₂= 81 °C, Calculate the final pressure. 4 m and the molecular weight of the air is 28.97 kg/kmol.
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