27.03.2014 Views

Tehnička termodinamika - Kemijsko-tehnološki fakultet

Tehnička termodinamika - Kemijsko-tehnološki fakultet

Tehnička termodinamika - Kemijsko-tehnološki fakultet

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

_____________________________________________Prvi glavni zakon termodinamike<br />

b)<br />

Q 1 ,2 = 0<br />

w<br />

T<br />

2<br />

⎛ p<br />

= T1<br />

⎜<br />

⎝ p<br />

2<br />

1<br />

⎞<br />

⎟<br />

⎠<br />

κ −1<br />

κ<br />

⎛ 1 ⎞<br />

= 298⎜<br />

⎟<br />

⎝ 4 ⎠<br />

1.4 −1<br />

logT<br />

2 = log 298 + log<br />

1.4<br />

R<br />

= 1 T<br />

κ −1<br />

T 2 = 200 K<br />

8.314<br />

29<br />

1.4 −1<br />

1.4−1<br />

1.4<br />

1<br />

4<br />

( T − ) = ( 298 200)<br />

1,2<br />

2<br />

−<br />

−1<br />

w1,2<br />

= 70.24 kJ kg<br />

c)<br />

w<br />

T<br />

2<br />

⎛ p<br />

= T1<br />

⎜<br />

⎝ p<br />

2<br />

1<br />

⎞<br />

⎟<br />

⎠<br />

= R<br />

1<br />

n −1<br />

T<br />

n−1<br />

n<br />

T 2 = 237 K<br />

⎛ 1 ⎞<br />

= 298⎜<br />

⎟<br />

⎝ 4 ⎠<br />

8.314<br />

29<br />

1.2 −1<br />

1.2−1<br />

1.2<br />

( T − ) = ( 298 237)<br />

1,2<br />

2<br />

−<br />

−1<br />

w1,2<br />

= 87.44 kJ kg<br />

n − κ 20.93 1.2 −1.4<br />

q1,2<br />

= cv<br />

2 T1<br />

−<br />

n −1<br />

29 1.2 −1<br />

( T − ) = ⋅ ( 237 298)<br />

−1<br />

q1,2<br />

= 44.03 kJ kg<br />

91

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!