Air is to be compressed from 3 bar and 303K to pressure of 15 bar in a multistage compression process with inter-stage cooling reducing the temperature down to 30 °C. The system allows maximum compression ratio of three (3) that should not be exceeded. a) Calculate number of compression stages required and the compression ratio b) Determine the actual power required by the first (1st) compressor [3] [10] c) Determine the actual power required by the last compressor and the outlet temperature [12] Assume Cp of air to be that of Nitrogen = 32 - 5.5 × 10-3 T + 2. 5 × 10-5 T 2 . For Air, Tc = -140.74 °C and Pc = 37.25 bar. Assume the polytropic efficiency of 75% for each compressor.
Air is to be compressed from 3 bar and 303K to pressure of 15 bar in a multistage compression process with inter-stage cooling reducing the temperature down to 30 °C. The system allows maximum compression ratio of three (3) that should not be exceeded. a) Calculate number of compression stages required and the compression ratio b) Determine the actual power required by the first (1st) compressor [3] [10] c) Determine the actual power required by the last compressor and the outlet temperature [12] Assume Cp of air to be that of Nitrogen = 32 - 5.5 × 10-3 T + 2. 5 × 10-5 T 2 . For Air, Tc = -140.74 °C and Pc = 37.25 bar. Assume the polytropic efficiency of 75% for each compressor.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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![Air is to be compressed from 3 bar and 303K to pressure of 15 bar in a multistage compression process
with inter-stage cooling reducing the temperature down to 30 °C. The system allows maximum
compression ratio of three (3) that should not be exceeded.
a) Calculate number of compression stages required and the compression ratio
b) Determine the actual power required by the first (1st) compressor
[3]
[10]
c) Determine the actual power required by the last compressor and the outlet temperature [12]
Assume Cp of air to be that of Nitrogen = 32 - 5.5 × 10-3 T + 2. 5 × 10-5 T 2 .
For Air, Tc = -140.74 °C and Pc = 37.25 bar. Assume the polytropic efficiency of 75% for each compressor.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbe233a08-2066-4c30-ad8e-6572f4d417b8%2F0146df0b-d330-483e-97a1-84174166ac81%2Fbgipn1q_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Air is to be compressed from 3 bar and 303K to pressure of 15 bar in a multistage compression process
with inter-stage cooling reducing the temperature down to 30 °C. The system allows maximum
compression ratio of three (3) that should not be exceeded.
a) Calculate number of compression stages required and the compression ratio
b) Determine the actual power required by the first (1st) compressor
[3]
[10]
c) Determine the actual power required by the last compressor and the outlet temperature [12]
Assume Cp of air to be that of Nitrogen = 32 - 5.5 × 10-3 T + 2. 5 × 10-5 T 2 .
For Air, Tc = -140.74 °C and Pc = 37.25 bar. Assume the polytropic efficiency of 75% for each compressor.
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