Determine net work done, Mechanical Engineering

Determine net work done:

5m3 of air at 2bar, 270C is compressed to 6bar pressure following PV1.3  = constant. It is expanded subsequently adiabatically to 2 bar. Considering two processes to be reversible, determine net work done, and also plot the processes on T - S diagrams.                                                                                                                                        

Sol:  V1 = 5m3, P1  = P3 = 2bar, P2  = 6bar, and n = 1.3

V2 = V1(P1/P2)1/1.3  = 5(2/6)1/1.3  = 2.147m3

Thus work done during process 1 - 2 is W1-2

= (P2V2  - P1V1)/(1- n)

= (6 × 105  × 2.47 - 2 x 105  × 5)/(1-1.3) = - 9.618 × 105  J

Likewise to obtain work done during processes 2 - 3, we apply

W2-3 = (P3V3  - P2V2)/(1 -   ); where      = 1.4

And V3 = V2(P2/P3)1/   = 2.147(6/2)1/1.4  = 4.705m3

2230_Determine net work done.png

199_Determine net work done10.png

 

Posted Date: 10/15/2012 9:03:18 AM | Location : United States







Related Discussions:- Determine net work done, Assignment Help, Ask Question on Determine net work done, Get Answer, Expert's Help, Determine net work done Discussions

Write discussion on Determine net work done
Your posts are moderated
Related Questions
Pattern Practices - Manufacturing processes: Pattern Practices : A pattern may be defined as a replica or fascimile model of the desired casting which, when packed or embedd


A hollow circular shaft has an internal diameter of 48 mm and an external diameter of 54 mm. Calculate the shear stress produced at the outer and inner surfaces of the shaft when t

Difference between path function and point function


Washing and Drying a Motorcycle :  It is important to wash and dry the motorcycle before servicing. It would ensure cleanliness during the service and would not allow any dust ent

Evaluate the stream function at point (2, 3) for a two dimensional flow given by U = 5x 3           v = - 15x 2 y Evaluate the velocity potential function for a two dimension

Gas welding is a method of joining two metal pieces (similar or dissimilar) together by melting and fusing their edges at the joint. It involves applying intense concentrated flam

1 Prepare an updated sketch of the electro-hydraulic system shown in Figure showing the actuators in their start position appropriate to your allocated actuator sequence. 2 By u

Q. Explain the types of belt drive used for power transmission? Also derive the velocity ratio of them. Sol:   There are mainly three types of belt drive: (1) Open belt driv