Plot the function for . Notice that the function has two vertical asymptotes. Plot the function by dividing the domain of x into
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Answer:
Part A:
(-ve sign shows heat is getting out)
Part B:
(Heat getting in)
The value of Q at constant specific heat is approximately 361% in difference with variable specific heat and at constant specific heat Q has opposite direction (going in) than Q which is calculated in Part B from table A-23. So taking constant specific heat is not a good idea and is questionable.
Explanation:
Assumptions:
- Gas is ideal
- System is closed system.
- K.E and P.E is neglected
- Process is polytropic
Since Process is polytropic so
Where n=1.25
Since Process is polytropic :
Now,
We will now calculate mass (m) and Temperature T_2.
Part A:
According to energy balance::
From A-20, C_v for Carbon dioxide at 300 K is 0.657 KJ/Kg.k
(-ve sign shows heat is getting out)
Part B:
From Table A-23:
(By interpolation)
(Heat getting in)
The value of Q at constant specific heat is approximately 361% in difference with variable specific heat and at constant specific heat Q has opposite direction (going in) than Q which is calculated in Part B from table A-23. So taking constant specific heat is not a good idea and is questionable.