R134a pressure–temperature chart

R134a is a pure fluid. Its normal boiling point is -26.1 °C; the critical pressure is 40.6 bar. At the AHRI 540 air-conditioning rating point — 7.2 °C evaporating, 54.4 °C condensing — the saturation pressures are 3.77 and 14.70 bar, a pressure ratio of 3.90.

Units: SI · US customary

Saturation table, -75 to 100 °C

°C	kPa abs	bar abs	psig	h_fg kJ/kg	ρ liquid kg/m³	ρ vapour kg/m³
-75	5.5	0.055	-13.9	246.7	1515	0.34
-70	8.0	0.080	-13.5	243.8	1502	0.49
-65	11.4	0.114	-13.0	240.9	1488	0.68
-60	15.9	0.159	-12.4	237.9	1474	0.93
-55	21.8	0.218	-11.5	235.0	1460	1.25
-50	29.5	0.295	-10.4	232.0	1446	1.65
-45	39.1	0.391	-9.0	228.9	1432	2.15
-40	51.2	0.512	-7.3	225.9	1418	2.77
-35	66.1	0.661	-5.1	222.7	1403	3.52
-30	84.4	0.844	-2.5	219.5	1388	4.43
-25	106.4	1.064	0.7	216.3	1373	5.51
-20	132.7	1.327	4.6	212.9	1358	6.78
-15	163.9	1.639	9.1	209.5	1343	8.29
-10	200.6	2.006	14.4	206.0	1327	10.04
-5	243.3	2.433	20.6	202.3	1311	12.08
0	292.8	2.928	27.8	198.6	1295	14.43
5	349.7	3.497	36.0	194.7	1278	17.13
10	414.6	4.146	45.4	190.7	1261	20.23
15	488.4	4.884	56.1	186.6	1243	23.76
20	571.7	5.717	68.2	182.3	1225	27.78
25	665.4	6.654	81.8	177.8	1207	32.35
30	770.2	7.702	97.0	173.1	1187	37.54
35	887.0	8.870	113.9	168.2	1168	43.42
40	1016.6	10.166	132.7	163.0	1147	50.09
45	1159.9	11.599	153.5	157.6	1125	57.66
50	1317.9	13.179	176.4	151.8	1102	66.27
55	1491.5	14.915	201.6	145.7	1078	76.10
60	1681.8	16.818	229.2	139.1	1053	87.38
65	1889.8	18.898	259.4	132.1	1026	100.40
70	2116.8	21.168	292.3	124.4	996	115.57
75	2364.1	23.641	328.2	115.9	964	133.49
80	2633.2	26.332	367.2	106.4	928	155.08
85	2925.8	29.258	409.7	95.5	887	181.85
90	3244.2	32.442	455.8	82.5	838	216.76
95	3591.2	35.912	506.2	65.4	773	267.14
100	3972.4	39.724	561.4	34.4	651	373.01

Pressures are absolute in kPa and bar, gauge in psig (at 101.325 kPa atmospheric); h_fg is the latent heat of vaporisation at the dew pressure; densities are saturated liquid and saturated vapour. Computed with CoolProp 8.0.0, the open-source property library the solver runs on, sampled every 0.5 K and printed every 5 K — the same tables the builder reads when it solves a circuit on R134a.

R134a compressors in the catalog

1,464 compressor maps run on R134a, each a page with its AHRI 540 / EN 12900 map across the published envelope, and each selectable in the builder. Read any of them at your own evaporating and condensing temperatures →

Copeland — 310 maps: ZB (56), ZS (32), ZBD (23), YS (22), YB (13), ZF (12), ZRH (11), KCJ (10), KCN (10), ZR (10), KCE (8), YBD (8)
Danfoss — 400 maps: MLZ (200), MTZ (115), SZ (78), VTZ (7)
Tecumseh — 180 maps: AJ (44), AE (35), THB (21), FH (16), THG (16), TC (12), AG (10), AWS (6), AGB (4), AH (2), AHC (2), HG (2)
Invotech — 55 maps: YW (51), YSW (4)
Embraco — 518 maps: EM (94), EMY (33), EMT (32), FFI (29), EMI (25), NEK (23), FFU (22), FF (20), FFUS (16), NT (16), EMIE (15), EMU (15)
Mitsubishi Electric — 1 map

The largest at the air-conditioning point

Copeland 6DJNR28ME-AWX (R134A Discus recip, 60 Hz, AC) — 90.0 kW at 7.2 / 54.4 °C
Copeland 6DJNR40ME-AWX (R134A Discus recip, 60 Hz, AC) — 90.0 kW at 7.2 / 54.4 °C
Copeland 6DRNR28ME-AWX (R134A Discus recip, 60 Hz, AC) — 90.0 kW at 7.2 / 54.4 °C
Copeland 6DRXR28ME-AWX (R134A Discus recip, 60 Hz, AC) — 90.0 kW at 7.2 / 54.4 °C
Danfoss SZ380-4 (R134a scroll, 60 Hz, A/C) — 75.8 kW at 7.2 / 54.4 °C
Danfoss SZ380-9 (R134a scroll, 60 Hz, A/C) — 75.8 kW at 7.2 / 54.4 °C
Copeland 6DHNR23ME-AWX (R134A Discus recip, 60 Hz, AC) — 75.7 kW at 7.2 / 54.4 °C
Copeland 6DHNR35ME-AWX (R134A Discus recip, 60 Hz, AC) — 75.7 kW at 7.2 / 54.4 °C
Copeland 6DKXR23ME-AWX (R134A Discus recip, 60 Hz, AC) — 75.7 kW at 7.2 / 54.4 °C
Copeland ZR380KCE-TED (R134A scroll, 60 Hz, AC) — 74.2 kW at 7.2 / 54.4 °C

Open the R134a chart in the app — the pressure–temperature line drawn, readable at any point, with a compressor's envelope over it — or open the builder and draw a circuit on R134a: the solver finds its evaporating and condensing temperatures from the coils and the compressor's map.