Isobutane (R-600a) saturation table by temperature

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

This table gives saturation pressure, specific volume, internal energy, enthalpy and entropy of saturated liquid and vapor for each temperature. 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]
T [°C]	P_sat [kPa]	v_f	v_g	u_f	u_fg	u_g	h_f	h_fg	h_g	s_f	s_fg	s_g
−65	6.7146	0.001539	4.4096	−51.142	378.65	327.51	−51.132	408.25	357.12	−0.23172	1.9613	1.7296
−60	9.2684	0.001551	3.2662	−41.113	374.18	333.07	−41.099	404.44	363.34	−0.18411	1.8975	1.7133
−55	12.576	0.001564	2.4590	−30.991	369.70	338.70	−30.972	400.60	369.63	−0.13717	1.8364	1.6992
−50	16.797	0.001576	1.8792	−20.775	365.19	344.41	−20.748	396.73	375.98	−0.090866	1.7778	1.6870
−45	22.107	0.001589	1.4561	−10.460	360.65	350.19	−10.425	392.81	382.38	−0.045155	1.7217	1.6765
−40	28.703	0.001602	1.1427	−0.045989	356.08	356.04	0.00000000	388.84	388.84	−0.00000000	1.6678	1.6678
−35	36.797	0.001616	0.90737	10.471	351.48	361.95	10.531	384.81	395.34	0.044633	1.6158	1.6605
−30	46.622	0.001630	0.72839	21.094	346.83	367.93	21.170	380.72	401.89	0.088778	1.5658	1.6546
−25	58.427	0.001644	0.59062	31.825	342.14	373.97	31.921	376.55	408.48	0.13247	1.5174	1.6499
−20	72.477	0.001659	0.48339	42.668	337.39	380.06	42.788	372.31	415.10	0.17573	1.4707	1.6464
−15	89.053	0.001674	0.39904	53.625	332.58	386.21	53.774	367.97	421.75	0.21860	1.4254	1.6440
−10	108.45	0.001690	0.33204	64.700	327.71	392.41	64.884	363.54	428.42	0.26109	1.3815	1.6426
−5	130.98	0.001706	0.27833	75.897	322.76	398.66	76.120	359.00	435.12	0.30325	1.3388	1.6420
0	156.96	0.001722	0.23491	87.218	317.74	404.95	87.488	354.34	441.82	0.34509	1.2972	1.6423
5	186.72	0.001740	0.19951	98.668	312.62	411.29	98.992	349.55	448.54	0.38664	1.2567	1.6433
10	220.61	0.001758	0.17045	110.25	307.41	417.66	110.64	344.63	455.27	0.42792	1.2171	1.6450
15	258.99	0.001776	0.14640	121.97	302.10	424.07	122.43	339.56	461.99	0.46896	1.1784	1.6474
20	302.22	0.001796	0.12637	133.83	296.68	430.50	134.37	334.33	468.69	0.50978	1.1405	1.6502
25	350.67	0.001816	0.10958	145.83	291.13	436.96	146.47	328.92	475.39	0.55040	1.1032	1.6536
30	404.72	0.001837	0.095422	157.99	285.45	443.44	158.73	323.33	482.06	0.59086	1.0666	1.6574
35	464.77	0.001859	0.083414	170.30	279.63	449.93	171.16	317.54	488.69	0.63116	1.0305	1.6616
40	531.21	0.001883	0.073174	182.77	273.65	456.42	183.77	311.52	495.29	0.67135	0.99480	1.6662
45	604.45	0.001907	0.064396	195.41	267.50	462.91	196.56	305.27	501.83	0.71144	0.95952	1.6710
50	684.90	0.001933	0.056833	208.22	261.16	469.39	209.55	298.76	508.31	0.75146	0.92453	1.6760
55	772.99	0.001960	0.050286	221.22	254.62	475.84	222.74	291.97	514.71	0.79144	0.88975	1.6812
60	869.16	0.001989	0.044592	234.42	247.84	482.26	236.15	284.87	521.02	0.83141	0.85508	1.6865
65	973.86	0.002020	0.039616	247.81	240.81	488.63	249.78	277.43	527.21	0.87141	0.82042	1.6918
70	1087.5	0.002053	0.035250	261.42	233.49	494.92	263.66	269.60	533.25	0.91147	0.78565	1.6971
75	1210.7	0.002089	0.031401	275.27	225.85	501.11	277.80	261.33	539.13	0.95164	0.75064	1.7023
80	1343.8	0.002128	0.027994	289.36	217.82	507.18	292.22	252.58	544.80	0.99197	0.71522	1.7072
85	1487.4	0.002170	0.024965	303.72	209.37	513.09	306.95	243.27	550.22	1.0325	0.67924	1.7118
90	1642.0	0.002217	0.022259	318.39	200.41	518.80	322.03	233.32	555.35	1.0734	0.64248	1.7159
95	1808.1	0.002269	0.019829	333.39	190.87	524.25	337.49	222.62	560.11	1.1146	0.60469	1.7193
100	1986.5	0.002328	0.017638	348.77	180.62	529.39	353.39	211.03	564.42	1.1564	0.56554	1.7220
105	2177.8	0.002395	0.015647	364.60	169.51	534.11	369.82	198.37	568.19	1.1990	0.52458	1.7235
110	2382.6	0.002473	0.013825	380.98	157.30	538.29	386.88	184.35	571.23	1.2425	0.48115	1.7236
115	2601.9	0.002568	0.012140	398.07	143.64	541.71	404.75	168.54	573.30	1.2874	0.43423	1.7216
120	2836.6	0.002688	0.010555	416.12	127.89	544.01	423.75	150.20	573.95	1.3344	0.38204	1.7165
125	3088.0	0.002852	0.0090199	435.69	108.76	544.45	444.49	127.81	572.30	1.3851	0.32100	1.7061
130	3357.8	0.003115	0.0074226	458.28	82.721	541.00	468.74	97.184	565.93	1.4436	0.24106	1.6847

The table as text, English units

		Specific volume [ft³/lbm]		Internal energy [Btu/lbm]			Enthalpy [Btu/lbm]			Entropy [Btu/lbm·R]
T [°F]	P_sat [psia]	v_f	v_g	u_f	u_fg	u_g	h_f	h_fg	h_g	s_f	s_fg	s_g
−90	0.80780	0.02455	84.083	−24.366	163.86	139.49	−24.362	176.42	152.06	−0.061736	0.47724	0.41551
−80	1.1674	0.02476	59.662	−19.596	161.72	142.13	−19.591	174.61	155.02	−0.049007	0.45989	0.41089
−70	1.6506	0.02498	43.224	−14.779	159.59	144.81	−14.771	172.78	158.01	−0.036482	0.44340	0.40692
−60	2.2875	0.02520	31.916	−9.9112	157.43	147.52	−9.9005	170.93	161.03	−0.024148	0.42769	0.40354
−50	3.1121	0.02543	23.979	−4.9920	155.27	150.28	−4.9773	169.06	164.09	−0.011991	0.41269	0.40069
−40	4.1629	0.02567	18.304	−0.019772	153.09	153.07	0.00000000	167.17	167.17	0	0.39834	0.39834
−30	5.4822	0.02591	14.177	5.0070	150.89	155.90	5.0332	165.25	170.28	0.011838	0.38459	0.39642
−20	7.1163	0.02616	11.127	10.090	148.67	158.76	10.124	163.28	173.41	0.023532	0.37138	0.39491
−10	9.1153	0.02641	8.8408	15.231	146.42	161.65	15.275	161.28	176.56	0.035095	0.35867	0.39377
0	11.533	0.02668	7.1033	20.431	144.14	164.57	20.488	159.24	179.73	0.046534	0.34642	0.39296
10	14.426	0.02695	5.7660	25.694	141.82	167.52	25.765	157.15	182.91	0.057860	0.33459	0.39245
20	17.854	0.02724	4.7248	31.019	139.48	170.50	31.109	155.00	186.11	0.069082	0.32313	0.39221
30	21.881	0.02753	3.9052	36.411	137.09	173.50	36.522	152.79	189.31	0.080208	0.31202	0.39223
40	26.573	0.02784	3.2535	41.870	134.65	176.52	42.007	150.51	192.52	0.091247	0.30122	0.39247
50	31.997	0.02816	2.7303	47.399	132.16	179.56	47.566	148.16	195.73	0.10221	0.29070	0.39291
60	38.225	0.02849	2.3065	53.000	129.62	182.62	53.202	145.74	198.94	0.11309	0.28044	0.39354
70	45.328	0.02884	1.9603	58.677	127.02	185.70	58.918	143.22	202.14	0.12392	0.27040	0.39432
80	53.380	0.02920	1.6754	64.431	124.36	188.79	64.719	140.62	205.34	0.13469	0.26056	0.39525
90	62.460	0.02958	1.4392	70.266	121.62	191.88	70.607	137.91	208.52	0.14541	0.25090	0.39630
100	72.644	0.02999	1.2419	76.184	118.80	194.98	76.588	135.09	211.68	0.15609	0.24138	0.39746
110	84.013	0.03041	1.0761	82.191	115.89	198.09	82.664	132.15	214.81	0.16673	0.23198	0.39871
120	96.650	0.03087	0.93579	88.289	112.89	201.18	88.841	129.08	217.92	0.17736	0.22267	0.40003
130	110.64	0.03135	0.81644	94.484	109.78	204.27	95.126	125.86	220.98	0.18797	0.21344	0.40141
140	126.06	0.03186	0.71429	100.78	106.55	207.33	101.52	122.47	224.00	0.19858	0.20423	0.40281
150	143.01	0.03242	0.62637	107.19	103.19	210.37	108.04	118.91	226.95	0.20919	0.19503	0.40423
160	161.58	0.03302	0.55028	113.71	99.667	213.37	114.69	115.13	229.83	0.21983	0.18580	0.40563
170	181.87	0.03367	0.48408	120.35	95.966	216.32	121.48	111.12	232.61	0.23050	0.17648	0.40698
180	203.96	0.03438	0.42617	127.13	92.056	219.19	128.43	106.84	235.27	0.24122	0.16703	0.40825
190	227.98	0.03517	0.37522	134.06	87.901	221.97	135.55	102.25	237.79	0.25202	0.15738	0.40941
200	254.02	0.03606	0.33015	141.16	83.456	224.62	142.86	97.281	240.14	0.26293	0.14747	0.41040
210	282.21	0.03706	0.29003	148.46	78.660	227.12	150.39	91.871	242.26	0.27398	0.13719	0.41117
220	312.68	0.03823	0.25404	155.98	73.427	229.41	158.20	85.915	244.11	0.28523	0.12641	0.41164
230	345.57	0.03962	0.22146	163.79	67.629	231.42	166.33	79.257	245.58	0.29676	0.11492	0.41168
240	381.05	0.04133	0.19157	171.98	61.053	233.03	174.89	71.647	246.54	0.30871	0.10240	0.41111
250	419.31	0.04357	0.16358	180.70	53.308	234.01	184.08	62.620	246.70	0.32132	0.088238	0.40956
260	460.61	0.04683	0.13623	190.34	43.500	233.84	194.34	51.119	245.46	0.33518	0.071032	0.40621
270	505.37	0.05320	0.10560	202.40	28.149	230.55	207.38	33.049	240.43	0.35261	0.045293	0.39790

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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