Gas cycles diagrams in thermodynamics

1. T
s
1
2
3
4
qout
qin P
v
1
2
3
qin
4
qout
T
s
1 2
3
4
qout
qin
Isentropic
TH
TL
Isentropic
1
2
3
4
P, kPa
100
Isentropic
Isentropic
qin
qout
v2 = v3= 1
–v1 v1 = v4
v
8
1
2 3
4
P
v
(a) P-v diagram
qin
qout
s
1
2
3
T
4
qout
(b) T-s diagram
qin
1
2
3
4
P
X
qin
qout
v
s
T
2
3
4
1
(a) T-s diagram
qout
qin
P
2
1 4
3
(b) P-v diagram
qout
qin
v
s
T
qin
qout
6
5
4
3
2
1

2. Vietnam Maritime University
School of Mechanical Engineering
02/02/2023 2
Chương 11
Chu trình làm lạnh
H2O
V = const.
We
H2O
1
2
He
50 kJ/kg
2
1
𝑊𝑖𝑛
CO2
300 kPa
30 ℃
We
CO2
300 kPa
30 ℃
We
400 kPa
He
150 kPa
27 ℃
Q

3. Vietnam Maritime University
School of Mechanical Engineering
02/02/2023 3
Chương 11
Chu trình làm lạnh
𝑄𝐻
𝑄𝐿
Compressor
Condenser
Expansion
valve
Evaporator
4
3
1
2
𝑊𝑖𝑛
T
s
1
2
3
4s 4
0.8 MPa
-14 ℃
T
s
𝑊𝑖𝑛
𝑄𝐻
𝑄𝐿
1
2
3
4s 4
1.0 MPa
185.4 kPa
T
s
𝑊𝑖𝑛
𝑄𝐻
𝑄𝐿
1
2
3
4s 4
1.0 MPa
185.4 kPa

4. T
s
1
2
3
4
T
s
1
2
3
4
T
s
2
3
4
1
T
s
1 2
3
4
s
=
const
s
=
const
T
s