R-438A - National Refrigerants Ltd

National Refrigerants, Ltd.
Technical
Guidelines
R-438A
______________________________________________________________________________________________________________________________
Physical Properties of Refrigerants
Environmental Classification
R-438A
HFC
Molecular Weight
Bubble Point (1 atm, ºC)
99.1
-42.3
Critical Pressure (bar-abs)
43.05
Critical Temperature (ºC)
85.3
Critical Density (Kg/m^3)
510.5
Liquid Density (25 ºC, Kg/m^3)
1146.8
Vapor Density (bp,Kg/m^3)
Heat of Vaporization (bp, KJ/Kg)
Ozone Depletion Potential (CFC 11 = 1.0)
Global Warming Potential (CO2 = 1.0)
5.32
215.72
0
2264
ASHRAE Standard 34 Safety Rating
A1
Temperature Glide (ºC)
3.5
Composition: A blend of HFC refrigerants R-32, R-125, R-134a and
hydrocarbons R-600 and R-601a (8.5 / 45 / 44.2 / 1.7 / 0.6 wt%)
Application: R-438A is intended to replace R-22 in existing direct
expansion systems where the expansion device capacity is very closely
matched to the system capacity (predominantly water chillers).
Performance: In most cases R-438A provides similar cooling capacity
and energy efficiency to R-22 while operating at significantly lower
compressor discharge temperature but actual performance depends on
system design and operating conditions.
Lubricant: The hydrocarbon component in R-438A helps promote oil
return in systems containing mineral oil or alkylbenzene. Although HFC
refrigerants won’t mix with these oils, the hydrocarbon addition thins the
oil and keeps it moving around the loop. More complicated piping
arrangements or large hold-up volumes may still require some oil be
changed to POE.
R-438A
Available in the following sizes:
20R438ART
9 Kg RETURNABLE CYLINDER
44R438ART
20 Kg RETURNABLE CYLINDER
100R438ART
46 Kg RETURNABLE CYLINDER
1587R438ART
720 Kg RETURNABLE DRUM
Refrigerant Reference Guide
Supplementary Edition
Technical
Guidelines
National Refrigerants, Ltd.
______________________________________________________________________________________________________________________________
THERMODYNAMIC PROPERTIES OF R-438A
Temp
[C]
-40
-38
-36
-34
-32
-30
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
Press(L)
[bar]
1.130
1.239
1.356
1.482
1.616
1.759
1.913
2.076
2.250
2.435
2.632
2.840
3.061
3.295
3.542
3.804
4.079
4.370
4.676
4.997
5.335
5.691
6.063
6.454
6.863
7.291
7.740
8.208
8.697
9.207
9.740
10.30
10.87
11.48
12.10
12.75
13.43
14.13
14.86
15.62
16.40
17.22
18.06
18.94
19.84
20.78
21.75
22.75
23.79
24.86
25.96
Press(V)
[bar]
0.837
0.925
1.020
1.123
1.233
1.352
1.480
1.617
1.763
1.920
2.087
2.266
2.456
2.658
2.873
3.101
3.342
3.598
3.868
4.154
4.455
4.773
5.108
5.460
5.831
6.220
6.629
7.057
7.507
7.977
8.470
8.985
9.523
10.09
10.67
11.29
11.92
12.59
13.28
14.01
14.76
15.54
16.35
17.20
18.08
18.99
19.94
20.92
21.95
23.01
24.11
Density(L)
[kg/m^3]
1383.7
1377.4
1371.1
1364.7
1358.3
1351.8
1345.3
1338.7
1332.1
1325.4
1318.7
1312.0
1305.1
1298.2
1291.3
1284.3
1277.2
1270.0
1262.8
1255.5
1248.1
1240.6
1233.0
1225.4
1217.6
1209.7
1201.8
1193.7
1185.5
1177.1
1168.6
1160.0
1151.2
1142.3
1133.2
1123.9
1114.5
1104.8
1094.9
1084.8
1074.5
1063.9
1052.9
1041.7
1030.2
1018.3
1005.9
993.15
979.88
966.04
951.57
Density(V)
[kg/m^3]
4.442
4.880
5.350
5.856
6.399
6.98
7.60
8.27
8.98
9.74
10.54
11.40
12.32
13.29
14.32
15.41
16.57
17.79
19.09
20.47
21.92
23.45
25.08
26.79
28.59
30.50
32.51
34.63
36.87
39.23
41.72
44.34
47.11
50.03
53.11
56.35
59.78
63.41
67.23
71.28
75.57
80.11
84.92
90.02
95.45
101.24
107.40
113.99
121.06
128.65
136.83
Enthalpy(L)
[kJ/kg]
148.8
151.4
153.9
156.4
159.0
161.6
164.1
166.7
169.3
171.9
174.5
177.1
179.8
182.4
185.0
187.7
190.4
193.1
195.8
198.5
201.2
203.9
206.7
209.4
212.2
215.0
217.8
220.7
223.5
226.4
229.3
232.2
235.1
238.0
241.0
244.0
247.0
250.1
253.1
256.2
259.4
262.5
265.7
269.0
272.2
275.6
278.9
282.3
285.8
289.3
292.9
Enthalpy(V)
[kJ/kg]
359.2
360.5
361.7
362.9
364.1
365.3
366.5
367.7
368.9
370.0
371.2
372.4
373.5
374.6
375.8
376.9
378.0
379.1
380.2
381.3
382.4
383.4
384.4
385.5
386.5
387.5
388.5
389.4
390.4
391.3
392.2
393.1
393.9
394.8
395.6
396.3
397.1
397.8
398.5
399.1
399.7
400.3
400.8
401.3
401.7
402.1
402.4
402.6
402.8
402.9
402.8
Entropy(L)
[kJ/kg-C]
0.8877
0.8985
0.9092
0.9199
0.9305
0.9410
0.9515
0.9619
0.9723
0.9827
0.9929
1.003
1.013
1.024
1.034
1.044
1.054
1.064
1.074
1.084
1.094
1.103
1.113
1.123
1.133
1.143
1.153
1.162
1.172
1.182
1.191
1.201
1.211
1.221
1.230
1.240
1.250
1.259
1.269
1.279
1.289
1.299
1.308
1.318
1.328
1.338
1.348
1.359
1.369
1.379
1.390
Entropy (V)
[kJ/kg-C]
1.803
1.800
1.797
1.795
1.792
1.790
1.788
1.785
1.783
1.781
1.779
1.778
1.776
1.774
1.772
1.771
1.769
1.768
1.766
1.765
1.764
1.763
1.761
1.760
1.759
1.758
1.757
1.756
1.755
1.753
1.752
1.751
1.750
1.749
1.748
1.747
1.746
1.745
1.743
1.742
1.741
1.739
1.738
1.736
1.735
1.733
1.731
1.729
1.727
1.724
1.722
Refrigerant Reference Guide
Supplementary Edition

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