Ammonia (R717) Thermodynamic properties

Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Ammonia (H₃N), computed with CoolProp. Any other state of Ammonia, from any two properties, in the State Explorer or the Worksheet.

Calculate a state of Ammonia Open it in the Worksheet

Constants

Formula: H₃N
Also known as: NH3, ammonia, R717, AMMONIA
CAS: 7664-41-7
Molar mass: 17.031 g/mol
Normal boiling point (1 atm): -33.316 °C (239.83 K)
Critical temperature: 132.41 °C (405.56 K)
Critical pressure: 11.363 MPa
Critical density: 233.25 kg/m³
Triple point: -77.655 °C, 6.0558 kPa
Acentric factor: 0.25569
Valid up to: 451.85 °C, 1000 MPa

Saturation table

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

Saturated Ammonia, 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)
-60	21.838	0.0014016	4.716	76.536	1444.1	1520.7	0.37464	7.1498
-40	71.633	0.0014497	1.5538	164.62	1389.2	1553.8	0.76925	6.7276
-20	190.03	0.0015038	0.62364	254.28	1328.8	1583.1	1.1374	6.3865
0	429.25	0.0015658	0.28935	345.68	1261.8	1607.5	1.4835	6.1028
20	857.04	0.0016383	0.1493	439.32	1186.3	1625.6	1.8119	5.8586
40	1554.5	0.0017253	0.083168	536.12	1099.6	1635.8	2.1274	5.639
60	2614.5	0.0018338	0.048818	637.55	997.79	1635.3	2.4354	5.4305
80	4141.3	0.0019774	0.029505	746.04	874.2	1620.2	2.7431	5.2185
100	6255.1	0.0021891	0.017822	866.74	715.67	1582.4	3.0633	4.9812
120	9108.8	0.0025965	0.010013	1016.5	480.16	1496.7	3.436	4.6573

Saturation table by pressure

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

Saturated Ammonia, 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)
10	-71.161	0.0013767	9.8004	28.051	1472.8	1500.8	0.14108	7.4324
20	-61.327	0.0013986	5.1203	70.749	1447.6	1518.3	0.34742	7.1814
30	-55.046	0.0014131	3.5043	98.208	1431	1529.2	0.47509	7.036
50	-46.496	0.0014335	2.1741	135.84	1407.6	1543.4	0.64419	6.8545
100	-33.577	0.0014664	1.1375	193.24	1370.4	1563.7	0.89016	6.6105
200	-18.842	0.0015072	0.59441	259.52	1325.1	1584.6	1.158	6.3687
300	-9.218	0.0015361	0.40597	303.31	1293.6	1596.9	1.3265	6.2277
500	4.149	0.0015799	0.25031	364.9	1246.9	1611.8	1.5529	6.0494
1000	24.913	0.0016581	0.12853	462.76	1166.2	1628.9	1.8904	5.8029
2000	49.371	0.0017729	0.064463	582.95	1054.1	1637.1	2.2723	5.5407
3000	65.74	0.0018705	0.042168	667.81	964.94	1632.8	2.5234	5.3707
5000	88.886	0.0020596	0.023643	797.66	809.35	1607	2.8826	5.1182
10000	125.2	0.0028105	0.0082281	1068.9	384.48	1453.4	3.5623	4.5275

Diagrams

p–h diagram of Ammonia, with isotherms

T–s diagram of Ammonia, with isobars

Superheated vapor table

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

Superheated Ammonia at 100 kPa (Tsat -33.577 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	1.1375	1449.9	1563.7	6.6105
0	1.3135	1506.9	1638.2	6.9019
50	1.5657	1590	1746.6	7.2661
100	1.8137	1675.5	1856.9	7.5834
150	2.0601	1765.1	1971.1	7.8704
200	2.3057	1859.1	2089.7	8.1353
250	2.5508	1957.7	2212.8	8.3826
300	2.7957	2061	2340.5	8.6157

Superheated Ammonia at 200 kPa (Tsat -18.842 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.59441	1465.8	1584.6	6.3687
0	0.6464	1500.1	1629.4	6.5384
50	0.7768	1586.6	1741.9	6.9171
100	0.9028	1673.4	1853.9	7.2392
150	1.0271	1763.5	1969	7.5284
200	1.1507	1857.9	2088.1	7.7944
250	1.2738	1956.8	2211.6	8.0425
300	1.3966	2060.2	2339.5	8.276

Superheated Ammonia at 500 kPa (Tsat 4.149 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.25031	1486.6	1611.8	6.0494
50	0.30324	1575.9	1727.6	6.4365
100	0.35619	1666.8	1844.9	6.7742
150	0.40735	1758.9	1962.6	7.0701
200	0.45769	1854.4	2083.3	7.3397
250	0.50755	1954.1	2207.8	7.5898
300	0.55714	2058	2336.5	7.8247

Superheated Ammonia at 1 MPa (Tsat 24.913 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.12853	1500.4	1628.9	5.8029
50	0.14497	1556.7	1701.7	6.0374
100	0.17387	1655.5	1829.3	6.4052
150	0.20072	1751	1951.8	6.7131
200	0.22667	1848.5	2075.2	6.9888
250	0.25214	1949.4	2201.6	7.2426
300	0.27732	2054.2	2331.5	7.4797

Superheated Ammonia at 2 MPa (Tsat 49.371 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.064463	1508.2	1637.1	5.5407
100	0.082469	1631.1	1796.1	6.0003
150	0.09732	1734.8	1929.4	6.3358
200	0.11113	1836.5	2058.8	6.6248
250	0.12443	1940	2188.9	6.8861
300	0.13741	2046.5	2321.4	7.128

Superheated Ammonia at 5 MPa (Tsat 88.886 °C)
T °C	v m³/kg	u kJ/kg	h kJ/kg	s kJ/(kg·K)
Sat.	0.023643	1488.8	1607	5.1182
100	0.02636	1535.3	1667.1	5.2817
150	0.034976	1680.4	1855.3	5.7569
200	0.041714	1798.3	2006.8	6.0957
250	0.047768	1910.8	2149.6	6.3827
300	0.053465	2023.2	2290.5	6.6399

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