Mechanical Engineering Thermodynamics Lecture: Turbines, Compressors, Pumps
Explore the fundamental principles of thermodynamics in Mechanical Engineering with a focus on turbines, compressors, and pumps. Learn about conservation of mass and energy laws, and practical applications in turbines, compressors, and pumps. Dive into the power requirements for running a compressor and a pump, understanding processes involving air compression and fluid flow.
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Department of Mechanical Engineering ME 322 Mechanical Engineering Thermodynamics Lecture 16 Turbines, Compressors, Pumps
The Laws of the Universe Conservation of Mass The Continuity Equation dm dt sys = m m i e i e Conservation of Energy The First Law of Thermodynamics 2 2 V V dE dt g g g g Q W + + + + + = i e g G m h z m h z i i i e e e 2 2 g c c c c i e 2
Turbine W = 100 hp 1 = = 300 psia 1 P x 1 1 2 = = 1 psia 0.75 P x 2 2 2 2 dE dt V V g g g g Q W + + + + + = 1 g 2 g G m h z m h z 1 1 1 2 2 2 2 2 c c c c dm dt sys = m m i e i e 3
Compressor Air enters a compressor at 100 kPa, 280 K and is compressed to 600 kPa, 400 K in a steady state process. The volumetric flow of the air entering the compressor is 34 cfm (ft3/min). The compressor is experiencing a heat loss of 16 kJ/kg. Assuming that the changes in kinetic and potential energies are negligible, determine the power required to run the compressor. = = 600 kPa 400 K P T 2 2 2 q = 16 kJ/kg W = = = 100 kPa 280 K 34 cfm P T V 1 1 1 1 dm dt 2 2 dE dt V V g g g g Q W + + + + + = 1 g 2 g G m h z m h z 1 1 1 2 2 2 2 2 c c c c sys = m m i e i e 4
Pump 2 10 psig 10 ft/s = 1 = = = = P V 0 psig 1 ft/s 8.3 lbm/s P V m 2 1 1 1 W 2 2 dE dt V V g g g g Q W + + + + + = 1 g 2 g G m h z m h z 1 1 1 2 2 2 2 2 c c c c dm dt sys = m m i e i e 5
