Test 1 solution

# Test 1 solution - CHEMICAL ENGINEERING THERMODYNAMICS...

This preview shows pages 1–2. Sign up to view the full content.

CHEMICAL ENGINEERING THERMODYNAMICS I (ChBE 2110) Fall 2010, Test-1 NAME: October, 2010 1. (30) Air is compressed by a compressor at a flow rate of 0.1 kmol per second. The temperature and the velocity of air flow are 300 K and 10 m s -1 at the entrance, and 500 K and 4 m s -1 at the exit of the compressor. The compressor works at a steady-state condition. The mechanical power applied to the compressor is 700 kW. Estimate the rate of heat transfer from the compressor. Assume C P = 7/2R, enthalpy is independent of pressure, and potential energy change is ignorable. Molecular weight of air is 29 kg/kmol. Solution T 1 = 300K, T 2 = 500K, u 1 = 10ms -1 , u 2 = 4 ms -1 , M = 29 kg/kmol, KW W S 700 = , s kg s kmol m / 9 . 2 / 1 . 0 = = C P = (7/2)R =29.1 kJ (mol) -1 K -1 =1.003 kJ kg -1 K -1 1 1 2 582 ) 300 500 ( 003 . 1 9 . 2 ) ( - = - × = - = kJS T T C m H m P 1 3 2 2 2 12 . 0 10 ) 10 4 ( 2 1 9 . 2 2 1 - - - = × - × = kJS u m 1 2 12 . 118 700 12 . 0 582 2 1 - - = - - = - + = kJS W u m H m Q s + = + + + W Q m zg u H dt mU d fs cv ] ) 2 1 [( ) ( 2 Steady state No potential energy change One entrance and one exit Only shaft work

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern