R134a Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of R134a (C₂F₄H₂), computed with CoolProp. Any other state of R134a, from any two properties, in the State Explorer or the Worksheet.

Calculate a state of R134a Open it in the Worksheet

Constants

Formula: C₂F₄H₂
Also known as: R134A
CAS: 811-97-2
Molar mass: 102.03 g/mol
Normal boiling point (1 atm): -26.074 °C (247.08 K)
Critical temperature: 101.06 °C (374.21 K)
Critical pressure: 4.0593 MPa
Critical density: 511.95 kg/m³
Triple point: -103.3 °C, 0.38956 kPa
Acentric factor: 0.32684
Valid up to: 181.85 °C, 70 MPa

Saturation table

By temperature: saturated liquid (f) and saturated vapor (g).

Saturated R134a, by temperature
T °C	Psat kPa	vf m³/kg	vg m³/kg	hf kJ/kg	hfg kJ/kg	hg kJ/kg	sf kJ/(kg·K)	sg kJ/(kg·K)
-100	0.5594	0.00063196	25.193	75.362	261.49	336.85	0.4354	1.9456
-80	3.6719	0.00065401	4.2682	99.161	249.67	348.83	0.56544	1.858
-60	15.906	0.00067827	1.079	123.36	237.95	361.31	0.68462	1.801
-40	51.209	0.00070537	0.36108	148.14	225.86	374	0.79561	1.7643
-20	132.74	0.00073623	0.14739	173.64	212.92	386.55	0.90025	1.7413
0	292.8	0.00077233	0.069309	200	198.6	398.6	1	1.7271
20	571.71	0.00081611	0.035997	227.47	182.28	409.75	1.0962	1.718
40	1016.6	0.00087204	0.019966	256.41	163.02	419.43	1.1905	1.7111
60	1681.8	0.00094979	0.011444	287.51	139.13	426.63	1.2848	1.7024
80	2633.2	0.0010773	0.0064484	322.39	106.42	428.81	1.3836	1.685

Saturation table by pressure

By pressure: saturated liquid (f) and saturated vapor (g).

Saturated R134a, by pressure
P kPa	Tsat °C	vf m³/kg	vg m³/kg	hf kJ/kg	hfg kJ/kg	hg kJ/kg	sf kJ/(kg·K)	sg kJ/(kg·K)
1	-94.369	0.00063797	14.543	82.037	258.12	340.16	0.47333	1.9171
2	-87.044	0.00064602	7.5615	90.745	253.79	344.54	0.52106	1.8848
3	-82.413	0.00065125	5.1617	96.272	251.08	347.35	0.5504	1.8668
5	-76.168	0.00065848	3.1934	103.76	247.43	351.19	0.58902	1.8451
10	-66.856	0.00066968	1.6667	115.01	241.98	356.99	0.6448	1.8178
20	-56.41	0.00068291	0.87081	127.77	235.82	363.58	0.70509	1.7931
30	-49.682	0.00069185	0.5958	136.07	231.79	367.85	0.74277	1.78
50	-40.454	0.00070471	0.36925	147.57	226.14	373.72	0.79317	1.765
100	-26.361	0.00072593	0.19256	165.44	217.16	382.6	0.86756	1.7475
200	-10.076	0.00075337	0.099876	186.6	206.02	392.62	0.95027	1.7334
300	0.672	0.00077366	0.067704	200.9	198.09	399	1.0033	1.7267
500	15.735	0.00080595	0.041123	221.5	185.97	407.47	1.0759	1.7197
1000	39.388	0.00087007	0.020316	255.5	163.67	419.16	1.1876	1.7113
2000	67.481	0.00098877	0.0092915	299.95	128.33	428.28	1.3208	1.6976
3000	86.203	0.0011413	0.0052813	334.7	92.635	427.34	1.4171	1.6748

Diagrams

p–h diagram of R134a, with isotherms

T–s diagram of R134a, with isobars

Superheated vapor table

At each pressure, from its saturated vapor (Sat.) to higher temperatures.

Superheated R134a at 50 kPa (Tsat -40.454 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.36925	355.25	373.72	1.765
-20	0.40488	368.97	389.21	1.8288
0	0.43897	382.98	404.93	1.8885
20	0.47266	397.64	421.27	1.9463
40	0.50609	412.97	438.28	2.0024
60	0.53933	428.98	455.94	2.0571
80	0.57245	445.64	474.26	2.1105
100	0.60546	462.96	493.24	2.1627
120	0.63841	480.93	512.85	2.2139
140	0.67129	499.53	533.09	2.2641
160	0.70414	518.75	553.96	2.3134
180	0.73695	538.59	575.44	2.3619

Superheated R134a at 100 kPa (Tsat -26.361 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.19256	363.34	382.6	1.7475
-20	0.19841	367.81	387.65	1.7677
0	0.2163	382.1	403.73	1.8288
20	0.23373	396.94	420.31	1.8874
40	0.25088	412.4	437.49	1.9441
60	0.26784	428.49	455.28	1.9991
80	0.28466	445.23	473.7	2.0528
100	0.30138	462.61	492.74	2.1053
120	0.31803	480.61	512.42	2.1566
140	0.33462	499.25	532.71	2.207
160	0.35117	518.5	553.62	2.2564
180	0.36768	538.37	575.13	2.3049

Superheated R134a at 200 kPa (Tsat -10.076 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.099876	372.64	392.62	1.7334
0	0.10481	380.24	401.2	1.7654
20	0.11419	395.49	418.33	1.8259
40	0.12323	411.22	435.87	1.8838
60	0.13206	427.51	453.92	1.9397
80	0.14074	444.4	472.54	1.994
100	0.14933	461.88	491.75	2.0468
120	0.15783	479.98	511.55	2.0985
140	0.16628	498.69	531.95	2.1491
160	0.17468	518	552.94	2.1987
180	0.18304	537.91	574.52	2.2474

Superheated R134a at 500 kPa (Tsat 15.735 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.041123	386.91	407.47	1.7197
20	0.042116	390.55	411.61	1.7339
40	0.046456	407.4	430.63	1.7967
60	0.050486	424.4	449.64	1.8555
80	0.054332	441.78	468.95	1.9118
100	0.058054	459.65	488.68	1.9661
120	0.061688	478.04	508.88	2.0189
140	0.065257	496.98	529.6	2.0703
160	0.068776	516.48	550.86	2.1205
180	0.072256	536.54	572.67	2.1697

Superheated R134a at 1 MPa (Tsat 39.388 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.020316	398.85	419.16	1.7113
60	0.023068	418.46	441.53	1.7806
80	0.025399	437	462.4	1.8415
100	0.027552	455.65	483.21	1.8988
120	0.029593	474.62	504.21	1.9536
140	0.031554	494	525.55	2.0065
160	0.033458	513.84	547.3	2.0579
180	0.035318	534.19	569.51	2.1081

Superheated R134a at 2 MPa (Tsat 67.481 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.0092915	409.7	428.28	1.6976
80	0.010539	424.7	445.78	1.748
100	0.012105	446.24	470.45	1.816
120	0.013436	466.93	493.8	1.877
140	0.01464	487.49	516.78	1.934
160	0.015764	508.21	539.74	1.9883
180	0.01683	529.23	562.89	2.0405

Enthalpy and entropy are measured from R134a's own reference state (CoolProp's default). The textbooks' refrigerant tables use ASHRAE's: in the Worksheet, write reference ASHRAE.