Carbon dioxide (R744) Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Carbon dioxide (CO₂), computed with CoolProp. Any other state of Carbon dioxide, from any two properties, in the State Explorer or the Worksheet.

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Constants

Formula: CO₂
Also known as: R744, co2, CO2, carbondioxide, CARBONDIOXIDE
CAS: 124-38-9
Molar mass: 44.01 g/mol
Critical temperature: 30.978 °C (304.13 K)
Critical pressure: 7.3773 MPa
Critical density: 467.6 kg/m³
Triple point: -56.558 °C, 517.96 kPa
Acentric factor: 0.22394
Valid up to: 1726.9 °C, 800 MPa

Saturation table

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

Saturated Carbon dioxide, 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)
-50	682.34	0.00086613	0.055789	92.943	339.73	432.68	0.57939	2.1018
-40	1004.5	0.00089571	0.038284	112.9	322.42	435.32	0.66564	2.0485
-30	1427.8	0.0009296	0.026956	133.34	303.48	436.82	0.74983	1.998
-20	1969.6	0.00096931	0.019343	154.45	282.44	436.89	0.83283	1.9485
-10	2648.7	0.0010174	0.014048	176.52	258.61	435.14	0.91571	1.8985
0	3485.1	0.0010782	0.010241	200	230.89	430.89	1	1.8453
10	4502.2	0.0011613	0.0073989	225.73	197.15	422.88	1.0884	1.7847
20	5729.1	0.001293	0.0051493	255.87	152	407.87	1.1877	1.7062

Saturation table by pressure

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

Saturated Carbon dioxide, 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)
600	-53.115	0.00085763	0.063134	86.796	344.85	431.65	0.55197	2.1192
700	-49.369	0.00086789	0.05443	94.191	338.68	432.87	0.5849	2.0984
800	-46.005	0.00087751	0.047827	100.87	332.99	433.86	0.61414	2.0801
1000	-40.122	0.00089534	0.038453	112.66	322.64	435.3	0.6646	2.0492
1500	-28.521	0.00093506	0.025638	136.41	300.52	436.93	0.76215	1.9906
2000	-19.503	0.00097148	0.019033	155.52	281.33	436.85	0.83694	1.9461
2500	-12.013	0.0010068	0.014973	171.98	263.68	435.66	0.89897	1.9087
3000	-5.552	0.0010425	0.012207	186.75	246.86	433.61	0.95291	1.8754
4000	5.3	0.0011185	0.00864	213.27	213.97	427.25	1.0461	1.8145
5000	14.284	0.0012087	0.0063827	237.87	179.79	417.66	1.1289	1.7544
6000	21.978	0.0013315	0.004742	262.85	140.47	403.32	1.2103	1.6862
7000	28.683	0.0015666	0.0032891	293.88	83.032	376.91	1.3093	1.5844

Diagrams

p–h diagram of Carbon dioxide, with isotherms

T–s diagram of Carbon dioxide, with isobars

Superheated vapor table

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

Superheated Carbon dioxide at 1 MPa (Tsat -40.122 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.038453	396.84	435.3	2.0492
-20	0.043418	411.8	455.21	2.1312
0	0.047992	426.05	474.04	2.2028
20	0.05236	440.17	492.53	2.2681
40	0.056596	454.36	510.96	2.3289
60	0.06074	468.73	529.47	2.3862
80	0.064818	483.32	548.14	2.4406
100	0.068847	498.17	567.01	2.4926
120	0.072838	513.28	586.12	2.5425
140	0.076799	528.67	605.47	2.5905
160	0.080736	544.33	625.07	2.6368
180	0.084654	560.26	644.92	2.6816

Superheated Carbon dioxide at 1.5 MPa (Tsat -28.521 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.025638	398.47	436.93	1.9906
-20	0.027239	405.64	446.5	2.0291
0	0.03067	421.34	467.35	2.1084
20	0.033832	436.35	487.1	2.1782
40	0.036836	451.15	506.4	2.2419
60	0.039737	465.96	525.56	2.3012
80	0.042566	480.89	544.74	2.3571
100	0.045342	496.01	564.02	2.4102
120	0.048078	511.34	583.45	2.4609
140	0.050782	526.91	603.08	2.5096
160	0.053461	542.72	622.91	2.5565
180	0.056121	558.78	642.96	2.6017

Superheated Carbon dioxide at 2 MPa (Tsat -19.503 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.019033	398.79	436.85	1.9461
0	0.021926	416.15	460	2.0341
20	0.024526	432.27	481.32	2.1095
40	0.026934	447.78	501.65	2.1766
60	0.029224	463.09	521.54	2.2381
80	0.031434	478.4	541.27	2.2956
100	0.033586	493.8	560.97	2.3499
120	0.035696	509.36	580.76	2.4016
140	0.037773	525.12	600.67	2.4509
160	0.039825	541.09	620.73	2.4984
180	0.041855	557.27	640.99	2.5441

Superheated Carbon dioxide at 3 MPa (Tsat -5.552 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.012207	396.99	433.61	1.8754
0	0.012931	403.43	442.22	1.9073
20	0.015116	423.12	468.46	2.0001
40	0.01698	440.52	491.46	2.076
60	0.018683	457.04	513.09	2.143
80	0.020287	473.21	534.07	2.2041
100	0.021824	489.25	554.73	2.261
120	0.023313	505.32	575.26	2.3146
140	0.024766	521.48	595.77	2.3655
160	0.026191	537.77	616.35	2.4142
180	0.027594	554.24	637.02	2.4608

Superheated Carbon dioxide at 5 MPa (Tsat 14.284 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.0063827	385.74	417.66	1.7544
20	0.0071099	396.83	432.38	1.8051
40	0.0088455	422.9	467.13	1.92
60	0.010173	443.33	494.19	2.0039
80	0.011334	461.87	518.54	2.0749
100	0.012399	479.56	541.55	2.1383
120	0.013403	496.83	563.84	2.1965
140	0.014363	513.92	585.73	2.2508
160	0.01529	530.96	607.41	2.302
180	0.016194	548.04	629.01	2.3508

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