itp uns semester 1 termodinamika
TRANSCRIPT
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Termodinamika
Bambang SAJurs. ITP FP UNS
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Usaha dan mengubah volume
pAdxdW dVAdx
pA
dx1
2
V1V2
p
Usaha = Luas
pdVdW
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Usaha
2
1
V
V
pdVdW )( 12 VVpdW
V
nRTp dV
V
nRTdW
2
1
V
V V
dVnRTW
1
2lnV
VnRTW
2
1lnp
pnRTW
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Usaha bergantung pada lintasan
1
3
2
4p1
V2
p2
V1
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HK Termodinamika I
Q = (U2 – U1) + W
Energi yg diterima oleh sistem akan digunakan untuk meningkatkan energi dalam dan melakukan usaha
Jika suatu proses pada suatu sistem akan membawanya kembali ke keadaan awal (proses siklis), maka U2 = U1 atau Q = W
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Proses adiabatik
Suatu proses yang tidak ada energi masuk maupun keluar sistem
Q = 0, maka
(U2 – U1) = - W
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Proses Isokorik
Suatu proses yang terjadi pada volume konstan
W = 0, maka
Q = (U2 – U1)
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Proses isotermik
Suatu proses yang terjadi pada suhu konstan
U2-1 = 0, maka
Q = W
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Proses isobarik
Suatu proses yang terjadi pada tekanan konstan
(U2 – U1) = mc – p(V2 - V1)
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Contoh
Satu gram air (1 cm3) dididihkan pada tekanan 1 atm berubah menjadi 1671 cm3. Panas penguapan air 539 kal/gram. Hitung
usaha dan pertambahan energi dalam.
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Throttling Process
P1
P2
W1 = p1 (0 – V1) W2 = p2 (V2 – 0)
W = p2V2 – p1V1
Karena prosesnya adiabatik, maka Q =0
U2 –U1= 0 – (p2V2 – p1V1)
U2 + p2V2 = U1 + p1V1 Entalpi
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Contoh
Dalam suatu proses, 500 kal panas diberikan pada suatu sistem dan pada waktu yg sama 100 J usaha dilakukan pada sistem itu. Berapa tambahnya energi dakhil sistem ?
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Contoh
Apabila air dididihkan di bawah tekanan 2 atm, panas penguapan 946 BTU/lb dan titik didih 250 oF. Satu pon uap menempati volume 14 ft3, dan volum 1 lb air 0,017 ft3. (a) Hitunglah usaha luar dalam foot-pount dan dalam BTU, apabila pada suhu tersebut terbentuk 1 lb uap (b) Hitunglah kenaikan energi dakhil dalam BTU
Q = (U2 – U1) + W
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