Isobutane (R-600a) saturation table by pressure

Name: Isobutane (R-600a) saturation table by pressure
Creator: Simuveliq

This table gives saturation temperature and properties of saturated liquid and vapor for each pressure. 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

		Specific volume [m³/kg]		Internal energy [kJ/kg]			Enthalpy [kJ/kg]			Entropy [kJ/kg·K]
P [kPa]	T_sat [°C]	v_f	v_g	u_f	u_fg	u_g	h_f	h_fg	h_g	s_f	s_fg	s_g
6	−66.682	0.001535	4.8972	−54.495	380.15	325.66	−54.486	409.53	355.04	−0.24790	1.9835	1.7356
8	−62.317	0.001546	3.7458	−45.772	376.26	330.49	−45.760	406.21	360.45	−0.20609	1.9267	1.7206
10	−58.780	0.001554	3.0433	−38.653	373.09	334.44	−38.637	403.51	364.87	−0.17260	1.8823	1.7097
15	−51.986	0.001571	2.0875	−24.845	366.98	342.14	−24.822	398.27	373.45	−0.10919	1.8008	1.6916
20	−46.853	0.001584	1.5980	−14.295	362.34	348.04	−14.263	394.26	380.00	−0.062029	1.7422	1.6802
25	−42.676	0.001595	1.2990	−5.6327	358.53	352.90	−5.5928	390.97	385.38	−0.024101	1.6964	1.6723
30	−39.128	0.001605	1.0967	1.7808	355.29	357.07	1.8290	388.14	389.97	0.0078211	1.6586	1.6664
40	−33.264	0.001621	0.83972	14.148	349.87	364.02	14.212	383.40	397.61	0.060015	1.5982	1.6583
50	−28.476	0.001634	0.68258	24.354	345.41	369.76	24.436	379.46	403.89	0.10215	1.5509	1.6530
60	−24.396	0.001646	0.57622	33.129	341.57	374.70	33.228	376.05	409.27	0.13772	1.5117	1.6494
80	−17.631	0.001666	0.44094	47.846	335.12	382.97	47.979	370.26	418.24	0.19609	1.4491	1.6452
100	−12.085	0.001683	0.35815	60.068	329.75	389.82	60.236	365.40	425.63	0.24342	1.3997	1.6431
150	−1.2723	0.001718	0.24512	84.325	319.02	403.35	84.583	355.53	440.12	0.33447	1.3077	1.6422
200	7.0354	0.001747	0.18700	103.37	310.51	413.88	103.72	347.56	451.28	0.40347	1.2405	1.6440
250	13.882	0.001772	0.15140	119.33	303.30	422.63	119.78	340.71	460.48	0.45980	1.1870	1.6468
300	19.757	0.001795	0.12726	133.25	296.94	430.19	133.78	334.58	468.37	0.50780	1.1423	1.6501
400	29.584	0.001835	0.096512	156.97	285.93	442.90	157.70	323.80	481.50	0.58750	1.0696	1.6571
500	37.713	0.001872	0.077660	177.04	276.41	453.45	177.98	314.30	492.28	0.65298	1.0111	1.6640
600	44.710	0.001906	0.064870	194.67	267.86	462.53	195.81	305.64	501.45	0.70912	0.96156	1.6707
800	56.448	0.001968	0.048555	225.03	252.68	477.70	226.60	289.95	516.55	0.80302	0.87970	1.6827
1000	66.186	0.002028	0.038529	251.02	239.10	490.13	253.05	275.61	528.65	0.88090	0.81219	1.6931
1500	85.423	0.002174	0.024724	304.95	208.63	513.58	308.21	242.46	550.67	1.0360	0.67617	1.7121
2000	100.36	0.002332	0.017486	349.90	179.84	529.75	354.57	210.15	564.72	1.1595	0.56263	1.7221
2500	112.72	0.002523	0.012894	390.17	150.09	540.26	396.48	176.02	572.50	1.2667	0.45616	1.7228
3000	123.29	0.002789	0.0095444	428.76	115.82	544.58	437.13	136.09	573.22	1.3672	0.34327	1.7105

The table as text, English units

		Specific volume [ft³/lbm]		Internal energy [Btu/lbm]			Enthalpy [Btu/lbm]			Entropy [Btu/lbm·R]
P [psia]	T_sat [°F]	v_f	v_g	u_f	u_fg	u_g	h_f	h_fg	h_g	s_f	s_fg	s_g
0.8	−90.255	0.02455	84.847	−24.487	163.91	139.43	−24.483	176.47	151.99	−0.062064	0.47770	0.41563
1	−84.279	0.02467	68.914	−21.643	162.64	141.00	−21.639	175.39	153.75	−0.054428	0.46721	0.41278
1.5	−72.823	0.02492	47.247	−16.144	160.19	144.05	−16.137	173.30	157.16	−0.039998	0.44798	0.40798
2	−64.187	0.02511	36.158	−11.956	158.34	146.38	−11.946	171.71	159.76	−0.029290	0.43417	0.40488
2.5	−57.172	0.02527	29.387	−8.5255	156.82	148.30	−8.5138	170.41	161.89	−0.020693	0.42338	0.40268
3	−51.222	0.02540	24.810	−5.5961	155.53	149.94	−5.5820	169.29	163.71	−0.013468	0.41448	0.40101
4	−41.406	0.02563	18.995	−0.72208	153.40	152.68	−0.70311	167.44	166.74	−0.0016764	0.40032	0.39864
5	−33.406	0.02582	15.442	3.2888	151.64	154.93	3.3127	165.90	169.22	0.0078228	0.38921	0.39703
6	−26.601	0.02599	13.037	6.7285	150.14	156.86	6.7574	164.58	171.34	0.015829	0.38004	0.39587
8	−15.336	0.02627	9.9808	12.480	147.62	160.10	12.519	162.36	174.88	0.028941	0.36539	0.39433
10	−6.1221	0.02651	8.1112	17.240	145.54	162.78	17.289	160.50	177.79	0.039545	0.35387	0.39342
15	11.796	0.02700	5.5598	26.645	141.41	168.05	26.720	156.76	183.48	0.059883	0.33250	0.39239
20	25.522	0.02740	4.2487	33.988	138.16	172.15	34.090	153.78	187.87	0.075237	0.31696	0.39219
25	36.809	0.02774	3.4458	40.120	135.43	175.55	40.249	151.25	191.49	0.087734	0.30463	0.39237
30	46.480	0.02804	2.9018	45.444	133.04	178.49	45.600	149.00	194.60	0.098357	0.29438	0.39273
40	62.623	0.02858	2.2089	54.482	128.95	183.43	54.693	145.09	199.78	0.11594	0.27779	0.39373
50	75.950	0.02905	1.7843	62.091	125.44	187.54	62.360	141.69	204.04	0.13033	0.26453	0.39486
60	87.404	0.02948	1.4964	68.743	122.34	191.08	69.070	138.62	207.69	0.14263	0.25339	0.39602
80	106.59	0.03027	1.1294	80.133	116.89	197.03	80.582	133.17	213.75	0.16311	0.23517	0.39828
100	122.49	0.03098	0.90430	89.821	112.13	201.95	90.395	128.29	218.69	0.18000	0.22037	0.40037
150	153.87	0.03264	0.59564	109.69	101.84	211.54	110.60	117.47	228.07	0.21331	0.19147	0.40477
200	178.27	0.03425	0.43567	125.95	92.750	218.70	127.22	107.61	234.82	0.23936	0.16868	0.40804
250	198.51	0.03592	0.33655	140.09	84.141	224.23	141.75	98.048	239.80	0.26129	0.14897	0.41026
300	215.93	0.03773	0.26824	152.89	75.616	228.51	154.99	88.413	243.40	0.28062	0.13087	0.41149
400	245.05	0.04238	0.17727	176.30	57.325	233.62	179.44	67.310	246.75	0.31497	0.095513	0.41048
500	268.85	0.05206	0.10972	200.72	30.596	231.31	205.53	35.931	241.47	0.35015	0.049321	0.39947

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

Full sources and licenses

Tables

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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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