7.4: Appendix D - Thermodynamic Properties of Carbon Dioxide

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Table D1: Saturated CO2

T (^oC)	P (MPa)	Specific Volume m³/kg		Specific Internal Energy kJ/kg		Specific Enthalpy kJ/kg		Specific Entropy kJ/kgK
		v_f	v_g	u_f	u_g	h_f	h_g	s_f	s_g
-50	0.68234	0.000866	0.055789	92.35	394.61	92.94	432.68	0.5794	2.1018
-48	0.73949	0.000872	0.051618	96.26	395.12	96.90	433.29	0.5968	2.0909
-46	0.80015	0.000878	0.047819	100.18	395.60	100.88	433.86	0.6142	2.0801
-44	0.86445	0.000883	0.044352	104.11	396.05	104.87	434.39	0.6314	2.0694
-42	0.93252	0.000889	0.041184	108.05	396.47	108.88	434.88	0.6486	2.0589
-40	1.00450	0.000896	0.038284	112.00	396.87	112.90	435.32	0.6656	2.0485
-38	1.08051	0.000902	0.035624	115.97	397.23	116.95	435.72	0.6826	2.0382
-36	1.16071	0.000909	0.033181	119.96	397.56	121.01	436.07	0.6995	2.0281
-34	1.24522	0.000915	0.030935	123.96	397.85	125.10	436.37	0.7163	2.0180
-32	1.33419	0.000922	0.028865	127.97	398.11	129.20	436.62	0.7331	2.0079
-30	1.42776	0.000930	0.026956	132.01	398.33	133.34	436.82	0.7498	1.9980
-28	1.52607	0.000937	0.025192	136.07	398.52	137.50	436.96	0.7665	1.9880
-26	1.62926	0.000945	0.023560	140.15	398.65	141.69	437.04	0.7831	1.9781
-24	1.73749	0.000953	0.022048	144.25	398.75	145.91	437.06	0.7997	1.9683
-22	1.85089	0.000961	0.020645	148.38	398.80	150.16	437.01	0.8163	1.9584
-20	1.96963	0.000969	0.019343	152.54	398.79	154.45	436.89	0.8328	1.9485
-18	2.09384	0.000978	0.018131	156.73	398.74	158.78	436.70	0.8494	1.9387
-16	2.22370	0.000987	0.017002	160.95	398.63	163.14	436.44	0.8659	1.9287
-14	2.35935	0.000997	0.015950	165.20	398.46	167.55	436.09	0.8825	1.9187
-12	2.50095	0.001007	0.014967	169.49	398.23	172.01	435.66	0.8991	1.9087
-10	2.64868	0.001017	0.014048	173.83	397.93	176.52	435.14	0.9157	1.8985
-8	2.80269	0.001028	0.013188	178.20	397.55	181.09	434.51	0.9324	1.8882
-6	2.96316	0.001040	0.012381	182.63	397.10	185.71	433.79	0.9491	1.8778
-4	3.13027	0.001052	0.011624	187.11	396.57	190.40	432.95	0.9660	1.8672
-2	3.30420	0.001065	0.010912	191.64	395.93	195.16	431.99	0.9829	1.8564
0	3.48514	0.001078	0.010241	196.24	395.20	200.00	430.89	1.0000	1.8453
2	3.67329	0.001093	0.009609	200.91	394.36	204.93	429.65	1.0172	1.8340
4	3.86884	0.001108	0.009011	205.66	393.39	209.95	428.25	1.0346	1.8223
6	4.07202	0.001124	0.008445	210.50	392.28	215.08	426.67	1.0523	1.8103
8	4.28306	0.001142	0.007909	215.44	391.02	220.34	424.89	1.0702	1.7977
10	4.50218	0.001161	0.007399	220.50	389.57	225.73	422.88	1.0884	1.7847
12	4.72966	0.001182	0.006912	225.69	387.92	231.29	420.62	1.1070	1.7710
14	4.96577	0.001205	0.006447	231.05	386.03	237.03	418.05	1.1261	1.7565
16	5.21080	0.001231	0.006000	236.59	383.86	243.01	415.12	1.1458	1.7411
18	5.46511	0.001260	0.005569	242.38	381.33	249.26	411.77	1.1663	1.7244
20	5.72905	0.001293	0.005149	248.46	378.37	255.87	407.87	1.1877	1.7062
22	6.00308	0.001332	0.004737	254.93	374.83	262.93	403.27	1.2105	1.6860
24	6.28773	0.001379	0.004327	261.94	370.50	270.61	397.70	1.2352	1.6629
26	6.58368	0.001440	0.003908	269.78	364.98	279.26	390.71	1.2628	1.6353
28	6.89182	0.001526	0.003459	279.11	357.36	289.62	381.20	1.2958	1.5999
30	7.21369	0.001685	0.002898	292.40	344.23	304.55	365.13	1.3435	1.5433
30.9782	7.37730	0.002139	0.002139	316.47	316.47	332.25	332.25	1.4336	1.4336

Table D2: Superheated CO2

T (^oC)	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK
	P = 400 kPa				P = 800 kPa (Sat. T = -46.00 ^oC)
Sat	–	–	–	–	0.046807	395.73	434.01	2.0771
-40	0.10499	405.37	447.36	2.2603	0.049662	399.96	439.69	2.1054
-20	0.11538	418.21	464.36	2.3302	0.055455	414.03	458.40	2.1825
0	0.12552	431.21	481.42	2.3951	0.060937	427.82	476.57	2.2516
20	0.13551	444.47	498.67	2.4561	0.066231	441.64	494.62	2.3153
40	0.14538	458.04	516.19	2.5139	0.071401	455.61	512.73	2.3751
60	0.15518	471.93	534.00	2.5690	0.076484	469.81	530.99	2.4316
80	0.16491	486.15	552.12	2.6218	0.081503	484.27	549.47	2.4855
100	0.17460	500.70	570.54	2.6725	0.086474	499.02	568.20	2.5371
120	0.18425	515.57	589.28	2.7214	0.091408	514.05	587.18	2.5866
140	0.19388	530.76	608.31	2.7687	0.096313	529.37	606.42	2.6343
160	0.20348	546.25	627.64	2.8143	0.101194	544.97	625.93	2.6805
180	0.21307	562.04	647.26	2.8586	0.106056	560.86	645.70	2.7251
200	0.22264	578.11	667.16	2.9016	0.110902	577.01	665.73	2.7683
220	0.23219	594.45	687.33	2.9433	0.115734	593.43	686.01	2.8103
240	0.24174	611.06	707.75	2.9839	0.120555	610.10	706.55	2.8511
260	0.25127	627.92	728.43	3.0235	0.125367	627.02	727.32	2.8908

T (^oC)	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK
	P = 1000 kPa (Sat. T = -40.12 ^oC)				P = 1400 kPa (Sat. T = -30.58 ^oC)
Sat	0.03779	396.93	435.40	2.0467	0.027145	398.31	436.80	1.9990
-20	0.04342	411.80	455.21	2.1312	0.029569	406.95	448.34	2.0476
0	0.04799	426.05	474.04	2.2028	0.033153	422.32	468.73	2.1251
20	0.05236	440.17	492.53	2.2681	0.036483	437.13	488.21	2.1939
40	0.05660	454.36	510.96	2.3289	0.039661	451.80	507.33	2.2570
60	0.06074	468.73	529.47	2.3862	0.042739	466.52	526.35	2.3159
80	0.06482	483.32	548.14	2.4406	0.045746	481.38	545.43	2.3715
100	0.06885	498.17	567.01	2.4926	0.048700	496.44	564.62	2.4244
120	0.07284	513.28	586.12	2.5425	0.051615	511.73	583.99	2.4750
140	0.07680	528.67	605.47	2.5905	0.054499	527.26	603.56	2.5235
160	0.08074	544.33	625.07	2.6368	0.057358	543.04	623.34	2.5703
180	0.08465	560.26	644.92	2.6816	0.060197	559.07	643.35	2.6154
200	0.08856	576.46	665.02	2.7250	0.063019	575.36	663.58	2.6591
220	0.09244	592.91	685.36	2.7671	0.065828	591.89	684.05	2.7015
240	0.09632	609.62	705.94	2.8080	0.068625	608.66	704.73	2.7426
260	0.10019	626.57	726.76	2.8478	0.071413	625.67	725.65	2.7826
280	0.10405	643.76	747.81	2.8866	0.074192	642.91	746.78	2.8215

T (^oC)	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK
	P = 2000 kPa (Sat. T = -19.50 ^oC)				P = 3000 kPa (Sat. T = -5.55 ^oC)
Sat	0.01885	398.78	436.83	1.9446	0.012124	396.93	433.52	1.8743
0	0.02193	416.15	460.00	2.0341	0.012931	403.43	442.22	1.9073
20	0.02453	432.27	481.32	2.1095	0.015116	423.12	468.46	2.0001
40	0.02693	447.78	501.65	2.1766	0.016980	440.52	491.46	2.0760
60	0.02922	463.09	521.54	2.2381	0.018683	457.04	513.09	2.1430
80	0.03143	478.40	541.27	2.2956	0.020287	473.21	534.07	2.2041
100	0.03359	493.80	560.97	2.3499	0.021824	489.25	554.73	2.2610
120	0.03570	509.36	580.76	2.4016	0.023313	505.32	575.26	2.3146
140	0.03777	525.12	600.67	2.4509	0.024766	521.48	595.77	2.3655
160	0.03982	541.09	620.73	2.4984	0.026191	537.77	616.35	2.4142
180	0.04186	557.27	640.99	2.5441	0.027594	554.24	637.02	2.4608
200	0.04387	573.69	661.43	2.5882	0.028979	570.89	657.83	2.5058
220	0.04587	590.34	682.08	2.6310	0.030350	587.74	678.79	2.5491
240	0.04786	607.21	702.92	2.6724	0.031708	604.79	699.91	2.5911
260	0.04983	624.31	723.98	2.7127	0.033057	622.04	721.21	2.6318
280	0.05180	641.63	745.24	2.7518	0.034396	639.49	742.68	2.6714
300	0.05377	659.17	766.70	2.7899	0.035729	657.15	764.34	2.7098

T (^oC)	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK	v m³/kg	u kJ/kg	h kJ/kg	s kJ/kgK
	P = 6000 kPa (Sat. T = 21.97 ^oC)				P = 10000 kPa
Sat	0.00474	374.87	403.32	1.6862	–	–	–	–
20	–	–	–	–	0.001168	231.02	242.70	1.1251
40	0.00670	411.53	451.72	1.8462	0.001591	297.13	313.04	1.3563
60	0.00801	435.41	483.45	1.9445	0.003449	390.53	425.02	1.7045
80	0.00908	455.64	510.12	2.0223	0.004513	425.72	470.85	1.8384
100	0.01004	474.37	534.60	2.0898	0.005303	451.11	504.14	1.9302
120	0.01092	492.37	557.92	2.1507	0.005977	473.09	532.86	2.0052
140	0.01176	510.00	580.59	2.2069	0.006584	493.44	559.28	2.0708
160	0.01257	527.46	602.88	2.2596	0.007147	512.90	584.37	2.1301
180	0.01335	544.87	624.96	2.3094	0.007679	531.85	608.64	2.1849
200	0.01411	562.31	646.95	2.3569	0.008188	550.51	632.39	2.2362
220	0.01485	579.81	668.91	2.4024	0.008679	569.03	655.82	2.2847
240	0.01558	597.43	690.90	2.4461	0.009156	587.48	679.04	2.3308
260	0.01630	615.17	712.95	2.4882	0.009622	605.94	702.16	2.3750
280	0.01701	633.05	735.09	2.5290	0.010078	624.44	725.22	2.4175
300	0.01771	651.09	757.34	2.5685	0.010527	643.01	748.28	2.4584
320	0.01840	669.28	779.70	2.6069	0.010969	661.67	771.36	2.4980

Reference States, IIR Convention

Enthalpy H = 200 kJ/kg at 0°C for saturated liquid.
Entropy S = 1 kJ/kg-K at 0°C for saturated liquid.

Source: Eric W. Lemmon, Mark O. McLinden and Daniel G. Friend, “Thermophysical Properties of Fluid Systems” in NIST Chemistry WebBook, NIST Standard Reference Database Number 69, Eds. P.J. Linstrom and W.G. Mallard, National Institute of Standards and Technology, Gaithersburg MD, 20899, https://doi.org/10.18434/T4D303, (retrieved May 2021).