Superheated isobutane (R-600a) vapor table

Name: Superheated isobutane (R-600a) vapor table
Creator: Simuveliq

This table gives v, u, h and s of superheated vapor in pressure blocks. Above you can use it interactively (switch units with SI/US, pick the pressure or go to the calculator for any point with step-by-step interpolation). Reference state: ASHRAE: h = 0 and s = 0 for saturated liquid at −40 °C (−40 °F).

The table as text, SI units

P = 0.015 MPa (T_sat = −51.986 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	2.0875	342.14	373.45	1.6916
−40	2.2044	356.67	389.73	1.7633
−20	2.3985	382.23	418.21	1.8804
0	2.5917	409.51	448.39	1.9951
20	2.7844	438.59	480.35	2.1080
40	2.9767	469.50	514.15	2.2195
60	3.1687	502.29	549.82	2.3299
80	3.3604	536.97	587.38	2.4394
100	3.5520	573.53	626.81	2.5480
120	3.7435	611.96	668.11	2.6558
140	3.9348	652.22	711.25	2.7628
160	4.1261	694.28	756.17	2.8689
180	4.3173	738.09	802.85	2.9743
200	4.5085	783.60	851.22	3.0787
220	4.6996	830.75	901.24	3.1822
240	4.8906	879.50	952.86	3.2848
260	5.0816	929.79	1006.0	3.3864
280	5.2726	981.58	1060.7	3.4871

P = 0.025 MPa (T_sat = −42.676 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	1.2990	352.90	385.38	1.6723
−40	1.3148	356.21	389.08	1.6883
−20	1.4327	381.87	417.68	1.8059
0	1.5497	409.21	447.96	1.9210
20	1.6661	438.33	479.99	2.0341
40	1.7821	469.29	513.84	2.1458
60	1.8978	502.11	549.55	2.2563
80	2.0132	536.81	587.14	2.3658
100	2.1286	573.39	626.60	2.4745
120	2.2437	611.83	667.92	2.5823
140	2.3588	652.11	711.07	2.6894
160	2.4738	694.17	756.02	2.7956
180	2.5887	737.99	802.71	2.9010
200	2.7035	783.50	851.09	3.0054
220	2.8183	830.66	901.12	3.1090
240	2.9331	879.42	952.75	3.2116
260	3.0478	929.72	1005.9	3.3132
280	3.1625	981.51	1060.6	3.4139

P = 0.04 MPa (T_sat = −33.264 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.83972	364.02	397.61	1.6583
−20	0.88936	381.31	416.88	1.7365
0	0.96349	408.76	447.30	1.8520
20	1.0370	437.95	479.43	1.9655
40	1.1101	468.96	513.37	2.0775
60	1.1829	501.82	549.14	2.1882
80	1.2554	536.56	586.78	2.2979
100	1.3278	573.17	626.28	2.4067
120	1.4001	611.63	667.64	2.5146
140	1.4723	651.93	710.82	2.6217
160	1.5443	694.01	755.78	2.7280
180	1.6163	737.84	802.49	2.8334
200	1.6883	783.37	850.89	2.9379
220	1.7601	830.54	900.94	3.0415
240	1.8320	879.30	952.58	3.1441
260	1.9038	929.61	1005.8	3.2458
280	1.9756	981.41	1060.4	3.3464

P = 0.06 MPa (T_sat = −24.396 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.57622	374.70	409.27	1.6494
−20	0.58741	380.55	415.79	1.6754
0	0.63776	408.14	446.40	1.7918
20	0.68748	437.44	478.69	1.9058
40	0.73675	468.52	512.73	2.0181
60	0.78571	501.44	548.59	2.1290
80	0.83444	536.23	586.29	2.2389
100	0.88300	572.87	625.85	2.3479
120	0.93141	611.37	667.25	2.4559
140	0.97973	651.69	710.47	2.5631
160	1.0279	693.79	755.47	2.6695
180	1.0761	737.64	802.21	2.7750
200	1.1242	783.18	850.63	2.8795
220	1.1723	830.37	900.70	2.9832
240	1.2203	879.14	952.36	3.0858
260	1.2683	929.46	1005.6	3.1875
280	1.3162	981.27	1060.2	3.2882

P = 0.1 MPa (T_sat = −12.085 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.35815	389.82	425.63	1.6431
0	0.37705	406.87	444.57	1.7140
20	0.40777	436.38	477.16	1.8291
40	0.43802	467.63	511.43	1.9421
60	0.46794	500.68	547.47	2.0537
80	0.49761	535.55	585.31	2.1639
100	0.52710	572.27	624.99	2.2732
120	0.55646	610.83	666.48	2.3815
140	0.58570	651.20	709.77	2.4889
160	0.61486	693.35	754.84	2.5954
180	0.64394	737.24	801.63	2.7010
200	0.67297	782.81	850.11	2.8057
220	0.70195	830.02	900.22	2.9094
240	0.73089	878.82	951.91	3.0121
260	0.75980	929.16	1005.1	3.1139
280	0.78867	980.99	1059.9	3.2146

P = 0.2 MPa (T_sat = 7.0354 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.18700	413.88	451.28	1.6440
20	0.19772	433.60	473.15	1.7202
40	0.21380	465.31	508.07	1.8355
60	0.22950	498.69	544.59	1.9485
80	0.24492	533.83	582.81	2.0599
100	0.26014	570.76	622.78	2.1699
120	0.27520	609.48	664.52	2.2789
140	0.29016	649.99	708.02	2.3868
160	0.30502	692.25	753.25	2.4937
180	0.31981	736.22	800.19	2.5996
200	0.33454	781.88	848.79	2.7045
220	0.34922	829.16	899.00	2.8085
240	0.36385	878.02	950.79	2.9114
260	0.37846	928.41	1004.1	3.0133
280	0.39303	980.29	1058.9	3.1142

P = 0.3 MPa (T_sat = 19.757 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.12726	430.19	468.37	1.6501
20	0.12740	430.57	468.80	1.6515
40	0.13889	462.84	504.51	1.7694
60	0.14990	496.62	541.59	1.8841
80	0.16061	532.04	580.23	1.9967
100	0.17110	569.20	620.52	2.1077
120	0.18142	608.09	662.52	2.2173
140	0.19162	648.74	706.23	2.3257
160	0.20173	691.12	751.64	2.4331
180	0.21175	735.20	798.72	2.5393
200	0.22172	780.94	847.45	2.6445
220	0.23163	828.29	897.78	2.7487
240	0.24150	877.22	949.67	2.8518
260	0.25134	927.66	1003.1	2.9539
280	0.26115	979.58	1057.9	3.0549

P = 0.5 MPa (T_sat = 37.713 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.077660	453.45	492.28	1.6640
40	0.078547	457.36	496.63	1.6780
60	0.085988	492.14	535.14	1.7972
80	0.093014	528.27	574.77	1.9127
100	0.099767	565.93	615.81	2.0257
120	0.10633	605.23	658.39	2.1368
140	0.11275	646.19	702.56	2.2464
160	0.11906	688.82	748.35	2.3546
180	0.12529	733.11	795.75	2.4616
200	0.13145	779.02	844.75	2.5674
220	0.13756	826.53	895.31	2.6720
240	0.14362	875.58	947.39	2.7756
260	0.14965	926.14	1001.0	2.8780
280	0.15564	978.16	1056.0	2.9793

P = 0.8 MPa (T_sat = 56.448 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.048555	477.70	516.55	1.6827
60	0.049534	484.32	523.95	1.7050
80	0.054700	521.94	565.70	1.8268
100	0.059464	560.62	608.19	1.9438
120	0.063973	600.64	651.82	2.0577
140	0.068305	642.16	696.80	2.1692
160	0.072510	685.23	743.24	2.2790
180	0.076619	729.87	791.16	2.3871
200	0.080654	776.07	840.60	2.4939
220	0.084629	823.82	891.52	2.5993
240	0.088555	873.08	943.93	2.7034
260	0.092442	923.82	997.78	2.8064
280	0.096296	976.00	1053.0	2.9081

P = 1.5 MPa (T_sat = 85.423 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.024724	513.58	550.67	1.7121
100	0.027451	545.25	586.43	1.8099
120	0.030651	588.20	634.17	1.9345
140	0.033508	631.63	681.89	2.0529
160	0.036160	676.07	730.31	2.1674
180	0.038674	721.76	779.77	2.2790
200	0.041088	768.79	830.42	2.3883
220	0.043428	817.20	882.35	2.4958
240	0.045709	867.02	935.59	2.6016
260	0.047944	918.23	990.15	2.7060
280	0.050141	970.81	1046.0	2.8088

P = 2.5 MPa (T_sat = 112.72 °C)
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
Sat.	0.012894	540.26	572.50	1.7228
120	0.014313	561.44	597.22	1.7863
140	0.017090	612.21	654.93	1.9296
160	0.019266	660.39	708.56	2.0564
180	0.021169	708.48	761.40	2.1756
200	0.022911	757.21	814.49	2.2903
220	0.024544	806.92	868.28	2.4016
240	0.026100	857.75	923.00	2.5104
260	0.027597	909.78	978.78	2.6170
280	0.029048	963.05	1035.7	2.7218

P = 4 MPa
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
140	0.0039811	508.50	524.42	1.5745
160	0.0090851	625.22	661.56	1.9011
180	0.011033	682.82	726.95	2.0488
200	0.012550	736.46	786.66	2.1777
220	0.013862	789.29	844.74	2.2980
240	0.015052	842.33	902.54	2.4129
260	0.016159	896.03	960.67	2.5240
280	0.017206	950.61	1019.4	2.6322

P = 6 MPa
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
140	0.0026876	459.89	476.02	1.4430
160	0.0034330	539.79	560.39	1.6422
180	0.0051570	629.87	660.81	1.8689
200	0.0067145	700.05	740.34	2.0408
220	0.0079267	760.93	808.49	2.1819
240	0.0089495	818.78	872.47	2.3091
260	0.0098576	875.72	934.87	2.4284
280	0.010689	932.67	996.80	2.5425

P = 10 MPa
T [°C]	v [m³/kg]	u [kJ/kg]	h [kJ/kg]	s [kJ/kg·K]
140	0.0023963	438.92	462.88	1.3869
160	0.0026291	501.04	527.33	1.5392
180	0.0029557	566.55	596.11	1.6944
200	0.0034119	634.73	668.85	1.8514
220	0.0039856	703.03	742.89	2.0047
240	0.0046054	769.15	815.21	2.1484
260	0.0052145	832.92	885.07	2.2820
280	0.0057925	895.17	953.10	2.4073

The table as text, English units

P = 1.5 psia (T_sat = −72.823 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	47.247	144.05	157.16	0.40798
−50	50.104	150.51	164.42	0.42620
0	56.335	165.67	181.30	0.46506
50	62.541	182.27	199.63	0.50287
100	68.732	200.38	219.46	0.53996
150	74.914	220.04	240.84	0.57654
200	81.090	241.28	263.79	0.61270
250	87.261	264.06	288.29	0.64848
300	93.429	288.37	314.30	0.68390
350	99.594	314.15	341.80	0.71894
400	105.76	341.35	370.70	0.75357
450	111.92	369.90	400.97	0.78779
500	118.08	399.75	432.53	0.82156

P = 2.5 psia (T_sat = −57.172 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	29.387	148.30	161.89	0.40268
−50	29.931	150.37	164.21	0.40840
0	33.701	165.56	181.15	0.44738
50	37.446	182.19	199.51	0.48526
100	41.176	200.31	219.36	0.52239
150	44.896	219.99	240.76	0.55900
200	48.609	241.23	263.72	0.59518
250	52.319	264.02	288.23	0.63097
300	56.025	288.34	314.25	0.66640
350	59.729	314.12	341.75	0.70145
400	63.431	341.32	370.67	0.73609
450	67.131	369.88	400.94	0.77031
500	70.831	399.73	432.50	0.80408

P = 4 psia (T_sat = −41.406 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	18.995	152.68	166.74	0.39864
0	20.969	165.40	180.92	0.43097
50	23.330	182.06	199.33	0.46896
100	25.675	200.22	219.22	0.50616
150	28.010	219.91	240.64	0.54280
200	30.339	241.16	263.62	0.57901
250	32.664	263.97	288.14	0.61483
300	34.985	288.29	314.18	0.65028
350	37.304	314.08	341.69	0.68533
400	39.621	341.28	370.61	0.71998
450	41.937	369.84	400.88	0.75421
500	44.252	399.70	432.45	0.78799

P = 6 psia (T_sat = −26.601 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	13.037	156.86	171.34	0.39587
0	13.895	165.19	180.61	0.41664
50	15.487	181.90	199.09	0.45478
100	17.063	200.08	219.03	0.49207
150	18.629	219.80	240.49	0.52877
200	20.189	241.07	263.49	0.56502
250	21.744	263.89	288.03	0.60087
300	23.297	288.22	314.08	0.63633
350	24.846	314.02	341.60	0.67141
400	26.394	341.23	370.53	0.70607
450	27.941	369.79	400.82	0.74030
500	29.486	399.66	432.39	0.77409

P = 10 psia (T_sat = −6.1221 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	8.1112	162.78	177.79	0.39342
0	8.2327	164.74	179.98	0.39821
50	9.2113	181.56	198.61	0.43666
100	10.173	199.82	218.64	0.47414
150	11.124	219.58	240.17	0.51096
200	12.069	240.89	263.22	0.54729
250	13.009	263.73	287.81	0.58320
300	13.945	288.08	313.89	0.61870
350	14.880	313.89	341.43	0.65380
400	15.812	341.12	370.38	0.68849
450	16.743	369.70	400.68	0.72274
500	17.673	399.57	432.27	0.75654

P = 20 psia (T_sat = 25.522 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	4.2487	172.15	187.87	0.39219
50	4.5011	180.69	197.35	0.41124
100	5.0035	199.14	217.65	0.44923
150	5.4943	219.03	239.37	0.48637
200	5.9779	240.43	262.55	0.52290
250	6.4566	263.34	287.23	0.55895
300	6.9319	287.74	313.39	0.59457
350	7.4047	313.59	341.00	0.62975
400	7.8756	340.85	370.00	0.66449
450	8.3451	369.45	400.34	0.69879
500	8.8134	399.35	431.96	0.73263

P = 30 psia (T_sat = 46.480 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	2.9018	178.49	194.60	0.39273
50	2.9272	179.76	196.01	0.39551
100	3.2784	198.43	216.63	0.43408
150	3.6166	218.46	238.54	0.47157
200	3.9470	239.96	261.87	0.50833
250	4.2722	262.94	286.65	0.54453
300	4.5939	287.39	312.89	0.58025
350	4.9129	313.29	340.56	0.61551
400	5.2301	340.58	369.61	0.65032
450	5.5457	369.21	400.00	0.68467
500	5.8602	399.12	431.66	0.71854

P = 50 psia (T_sat = 75.950 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	1.7843	187.54	204.04	0.39486
100	1.8944	196.91	214.43	0.41383
150	2.1124	217.27	236.82	0.45212
200	2.3211	238.98	260.46	0.48938
250	2.5240	262.12	285.47	0.52591
300	2.7230	286.68	311.88	0.56186
350	2.9193	312.67	339.68	0.59729
400	3.1135	340.03	368.83	0.63223
450	3.3061	368.71	399.31	0.66667
500	3.4976	398.68	431.04	0.70063

P = 80 psia (T_sat = 106.59 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	1.1294	197.03	213.75	0.39828
150	1.2626	215.33	234.02	0.43277
200	1.4046	237.44	258.23	0.47092
250	1.5396	260.83	283.63	0.50802
300	1.6700	285.59	310.31	0.54435
350	1.7974	311.72	338.33	0.58005
400	1.9227	339.19	367.65	0.61519
450	2.0463	367.96	398.26	0.64978
500	2.1686	398.00	430.10	0.68386

P = 150 psia (T_sat = 153.87 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	0.59564	211.54	228.07	0.40477
200	0.68527	233.31	252.33	0.44290
250	0.77053	257.56	278.95	0.48179
300	0.84922	282.88	306.45	0.51922
350	0.92393	309.39	335.04	0.55566
400	0.99598	337.16	364.80	0.59133
450	1.0661	366.16	395.75	0.62632
500	1.1349	396.38	427.88	0.66069

P = 250 psia (T_sat = 198.51 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	0.33655	224.23	239.80	0.41026
200	0.33920	225.07	240.76	0.41172
250	0.41219	251.91	270.98	0.45590
300	0.47074	278.48	300.25	0.49576
350	0.52295	305.77	329.96	0.53362
400	0.57152	334.06	360.50	0.57022
450	0.61772	363.46	392.03	0.60587
500	0.66225	393.98	424.61	0.64073

P = 400 psia (T_sat = 245.05 °F)
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
Sat.	0.17727	233.62	246.75	0.41048
250	0.18770	237.75	251.65	0.41741
300	0.25108	270.07	288.65	0.46789
350	0.29456	299.43	321.23	0.50943
400	0.33152	328.90	353.44	0.54803
450	0.36502	359.08	386.10	0.58495
500	0.39634	390.16	419.50	0.62069

P = 600 psia
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
300	0.10686	248.23	260.09	0.42182
350	0.16287	288.32	306.40	0.48103
400	0.19662	320.80	342.63	0.52446
450	0.22424	352.56	377.46	0.56385
500	0.24876	384.66	412.28	0.60111

P = 1000 psia
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
300	0.044187	208.07	216.25	0.35869
350	0.061342	254.55	265.90	0.42191
400	0.089532	299.49	316.06	0.48209
450	0.11303	337.11	358.02	0.52956
500	0.13236	372.34	396.83	0.57110

P = 1500 psia
T [°F]	v [ft³/lbm]	u [Btu/lbm]	h [Btu/lbm]	s [Btu/lbm·R]
300	0.039604	199.78	210.78	0.34643
350	0.045672	237.80	250.48	0.39702
400	0.055081	278.01	293.30	0.44832
450	0.067465	318.17	336.90	0.49763
500	0.080429	356.65	378.98	0.54267

Sources

Values computed by Simuveliq with CoolProp 8.0.0 (downloaded from PyPI, code on GitHub), free software under the MIT license. The temperatures and pressures of the table were chosen by Simuveliq; no table was copied from a book.

Equation of state: D. Buecker, W. Wagner (2006). Reference Equations of State for the Thermodynamic Properties of Fluid Phase n-Butane and Isobutane. J. Phys. Chem. Ref. Data 35, 929–1019. doi:10.1063/1.1901687
CoolProp: Bell, Ian H., Wronski, Jorrit, Quoilin, Sylvain, Lemort, Vincent (2014). Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library CoolProp. Ind. Eng. Chem. Res. 53, 2498–2508. doi:10.1021/ie4033999

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Tables

Water: saturation (T) · saturation (P) · superheated vapor · compressed liquid
R-134a: saturation (T) · saturation (P) · superheated vapor
R-22: saturation (T) · saturation (P) · superheated vapor
R-32: saturation (T) · saturation (P) · superheated vapor
R-404A: saturation (T) · saturation (P) · superheated vapor
R-410A: saturation (T) · saturation (P) · superheated vapor
R-1234yf: saturation (T) · saturation (P) · superheated vapor
Ammonia (R-717): saturation (T) · saturation (P) · superheated vapor
Carbon dioxide (R-744): saturation (T) · saturation (P) · superheated vapor
Propane (R-290): saturation (T) · saturation (P) · superheated vapor
Isobutane (R-600a): saturation (T) · saturation (P) · superheated vapor
Nitrogen: saturation (T) · saturation (P) · superheated vapor
Oxygen: saturation (T) · saturation (P) · superheated vapor
Hydrogen: saturation (T) · saturation (P) · superheated vapor
Helium: saturation (T) · saturation (P) · superheated vapor
Argon: saturation (T) · saturation (P) · superheated vapor
Methane: saturation (T) · saturation (P) · superheated vapor
Air: ideal gas
Nitrogen (N₂) per mole: ideal gas
Oxygen (O₂) per mole: ideal gas
Carbon dioxide (CO₂) per mole: ideal gas
Carbon monoxide (CO) per mole: ideal gas
Hydrogen (H₂) per mole: ideal gas
Water vapor (H₂O) per mole: ideal gas
critical constants and molar mass
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