{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# ch8solutions - 8-16 The four processes of an air-standard...

This preview shows pages 1–3. Sign up to view the full content.

8-16 The four processes of an air-standard cycle are described. The cycle is to be shown on P-v and T-s diagrams, and the maximum temperature in the cycle and the thermal efficiency are to be detennined. Assumptions 1 The air-standard assumptions are applicable. 2 Kinetic and potential energy changes negligible. 3 Air is an ideal gas with constant specific heats. Properties The properties of air at room temperature are Cp = 1.005 kJ/kg.K, C" = 0.718 kJ/kg. K. ; k = 1.4 (Table A-2). Analysis (b) From the ideal gas isentropic relations and energy balance, p ( ) (k-J)/ k { ) 0.4/J.4 i T 2 = TJ !01- = (300K 1000kPa = 579.2K . ~!: . PJ 100kPa 2'i 'IV 13 8-16 The four diagrams, and the maximum temperature in the cycle and the thermal effil Assumptions 1 The air-standard assumptions are applicable. 2 Kinetic negligible. 3 Air is an ideal gas with corn Properties The properties of air at room k = 1.4 (Table A-2). Analysis (b) From the ideal gas isentropi qin =h3 -h2 =Cp(T3 -T2) 2200 kJ/kg = (1.005 kJ/kg. KXT3 -t 579.2) Tmax =T3 =2768 K Of, ) ~=~ ---+ T4 ;~T3 ;':'~~(2768 K);276.8 K T3 T4 P.~ 1000 kPa qoul ; q34.oul + Q4J.oul = (U3 - U4)+ (h4, - hi) I ;Cv(T3 -T4)+Cp(T4 -T1) ; (0.718 kJ/kg. KX2768 - 276.8)K + (1.005 kJ/kg. KX276.8- ; 1766 kJ/kg (c) 17th = 1-~=1- 1766 kJ/kg qin 2200 kJ/kg= 19.7% and P qil 2,---';' l ~ q 34 \~--~- ~ I q41 V T 3 d 1ft 2 q34 ) q4~ 300 )K

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

View Full Document
8.33
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