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1. Helium expands polytropically through a turbine according to the process pv15 =C. The inlet temperature is 1000 K, the inlet pressure is 1000 kPa, and the exit pressure is 150 kPa. The turbine produces 100 MW. Determine (a) the exit temperature, (b) the heat transferred, and (c) the mass flow rate. Ans: 531.3 K; Q= 16,646 kJ/s;_m=34.25 kg/s

1. Helium expands polytropically through a turbine according to the process pv15 =C. The inlet temperature is 1000 K, the inlet pressure is 1000 kPa, and the exit pressure is 150 kPa. The turbine produces 100 MW. Determine (a) the exit temperature, (b) the heat transferred, and (c) the mass flow rate. Ans: 531.3 K; Q= 16,646 kJ/s;_m=34.25 kg/s

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
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FIRST LAW OF THERMODYNAMICS CONSERVATION OF ENERGY – OPEN SYSTEM

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FIRST LAW OF THERMODYNAMICS CONSERVATION OF ENERGY – OPEN SYSTEM GET the heat transferred (b) only. 1. Helium expands polytropically through a turbine according to the process pv1.5=C. The inlet temperature is 1000 K, the inlet pressure is 1000 kPa, and the exit pressure is 150 kPa. The turbine produces 100 MW. Determine (a) the exit temperature, (b) the heat transferred, and (c) the mass flow rate. Ans: 531.3 K; Q= 16,646 kJ/s;_ m=34.25 kg/s 2. An air compressor is designed to compress atmospheric air (assumed to be at 100 kPa, 20°C) to a pressure of 1 MPa. Heat losses to the environment are anticipated to be about equal to 10. of the power input to the compressor. The air enters at 50 m/s where the inlet area is 90 cm? and leaves at 120 m/s through an area of 5cm2. Determine the exit air temperature and the power input to the compressor. percent Ans: = 117.8°C ; Pinput = 61.83 kW (applied on)
Transcribed Image Text:FIRST LAW OF THERMODYNAMICS CONSERVATION OF ENERGY – OPEN SYSTEM GET the heat transferred (b) only. 1. Helium expands polytropically through a turbine according to the process pv1.5=C. The inlet temperature is 1000 K, the inlet pressure is 1000 kPa, and the exit pressure is 150 kPa. The turbine produces 100 MW. Determine (a) the exit temperature, (b) the heat transferred, and (c) the mass flow rate. Ans: 531.3 K; Q= 16,646 kJ/s;_ m=34.25 kg/s 2. An air compressor is designed to compress atmospheric air (assumed to be at 100 kPa, 20°C) to a pressure of 1 MPa. Heat losses to the environment are anticipated to be about equal to 10. of the power input to the compressor. The air enters at 50 m/s where the inlet area is 90 cm? and leaves at 120 m/s through an area of 5cm2. Determine the exit air temperature and the power input to the compressor. percent Ans: = 117.8°C ; Pinput = 61.83 kW (applied on)
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