M07J40G8-00
21/07/08
page 35
REFRIGERANT TABLES
THIS SECTION IS DEVOTED ONLY TO QUALIFIED TECHNICIANS THAT KNOW THE FOLLOWING:
•
THE OPERATIONAL PRINCIPLES OF THE REFRIGERATING CIRCUIT OPERATION
•
THE MODES OF DETECTING TEMPERATURE AND PRESSURE
•
THE RISKS RELEVANT TO THESE OPERATIONS
The data of the tables allow the testing of the refrigerating circuit operation by the detection of a few objective parameters.
The data are significant if they are detected simultaneously and while the refrigerating circuit is running.
OVERHEATING
=
return temperature – Saturation temperature
SUBCOOLING
=
condensing temperature (pressure *) – liquid temperature
Return pressure
3.0 bar
Condensing pressure
16.0 bar
Return temperature
11.0 °C
Liquid temp.
50 °C
overheating
11 – 8.93 = 2°
subcooling
60.46 – 50 = 10.46°
* It is important that the condensation pressure is detected as close as possible to the point where the liquid temperature is
detected, in the event that the calculation will be effected by the losses of charge (and, therefore, of temperature) caused by
the refrigerating circuit components placed between the two measurement points.
Pg = P gauge = relevant pressure (read on the pressure gauge) , Ts = saturation pressure
R 134A
Pg
Ts [°C]
Pg
Ts [°C]
Pg
Ts [°C]
Pg
Ts [°C]
Pg
Ts [°C]
Pg
Ts [°C]
Pg
Ts [°C]
Pg
Ts [°C]
0.0
-26.36
5.0
21.57
10.0
42.97
15.0
57.91
20.0
69.64
25.0
79.41
30.0
87.79
35.0
95.12
0.2
-22.31
5.2
22.65
10.2
43.66
15.2
58.43
20.2
70.07
25.2
79.76
30.2
88.10
35.2
95.40
0.4
-18.76
5.4
23.70
10.4
44.33
15.4
58.94
20.4
70.49
25.4
80.12
30.4
88.41
35.4
95.67
0.6
-15.59
5.6
24.73
10.6
45.00
15.6
59.45
20.6
70.90
25.6
80.48
30.6
88.72
35.6
95.94
0.8
-12.71
5.8
25.73
10.8
45.66
15.8
59.96
20.8
71.32
25.8
80.83
30.8
89.03
35.8
96.21
1.0
-10.08
6.0
26.71
11.0
46.32
16.0
60.46
21.0
71.73
26.0
81.18
31.0
89.33
36.0
96.48
1.2
-7.64
6.2
27.67
11.2
46.96
16.2
60.95
21.2
72.14
26.2
81.53
31.2
89.64
36.2
96.75
1.4
-5.37
6.4
28.62
11.4
47.59
16.4
61.44
21.4
72.54
26.4
81.87
31.4
89.94
36.4
97.01
1.6
-3.24
6.6
29.54
11.6
48.22
16.6
61.93
21.6
72.95
26.6
82.22
31.6
90.24
36.6
97.28
1.8
-1.23
6.8
30.44
11.8
48.84
16.8
62.42
21.8
73.35
26.8
82.56
31.8
90.54
36.8
97.54
2.0
0.67
7.0
31.33
12.0
49.46
17.0
62.90
22.0
73.74
27.0
82.90
32.0
90.83
37.0
97.80
2.2
2.48
7.2
32.20
12.2
50.06
17.2
63.37
22.2
74.14
27.2
83.24
32.2
91.13
37.2
98.06
2.4
4.20
7.4
33.05
12.4
50.66
17.4
63.84
22.4
74.53
27.4
83.58
32.4
91.43
37.4
98.32
2.6
5.84
7.6
33.89
12.6
51.26
17.6
64.31
22.6
74.92
27.6
83.91
32.6
91.72
37.6
98.58
2.8
7.42
7.8
34.72
12.8
51.84
17.8
64.77
22.8
75.31
27.8
84.24
32.8
92.01
37.8
98.84
3.0
8.93
8.0
35.53
13.0
52.42
18.0
65.23
23.0
75.69
28.0
84.58
33.0
92.30
38.0
99.09
3.2
10.39
8.2
36.32
13.2
53.00
18.2
65.69
23.2
76.07
28.2
84.90
33.2
92.59
38.2
99.34
3.4
11.79
8.4
37.11
13.4
53.56
18.4
66.14
23.4
76.45
28.4
85.23
33.4
92.88
38.4
99.60
3.6
13.15
8.6
37.88
13.6
54.13
18.6
66.59
23.6
76.83
28.6
85.56
33.6
93.16
38.6
99.85
3.8
14.46
8.8
38.64
13.8
54.68
18.8
67.04
23.8
77.21
28.8
85.88
33.8
93.45
38.8
100.09
4.0
15.74
9.0
39.39
14.0
55.23
19.0
67.48
24.0
77.58
29.0
86.20
34.0
93.73
39.0
100.34
4.2
16.97
9.2
40.13
14.2
55.78
19.2
67.92
24.2
77.95
29.2
86.52
34.2
94.01
39.2
100.59
4.4
18.17
9.4
40.85
14.4
56.32
19.4
68.36
24.4
78.32
29.4
86.84
34.4
94.29
39.4
100.83
4.6
19.33
9.6
41.57
14.6
56.85
19.6
68.79
24.6
78.68
29.6
87.16
34.6
94.57
4.8
20.47
9.8
42.27
14.8
57.38
19.8
69.22
24.8
79.04
29.8
87.47
34.8
94.85
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