Ammonia - NH3 - Properties

Thermodynamic properties - specific volume, enthalpy and entropy - of saturated and superheated ammonia R-717

The table below can be used to determine specific volume (v), specific internal energy (u), enthalpy (h), and entropy (s) of saturated and superheated ammonia - NH3 - also known as refrigerant 717.

nh3 ammonia temperature pressure diagram

Saturated Properties Superheated Properties
(t - ts)
Temperature
- ts -
(oC)
Pressure
- ps -
(bar)
Specific Volume
- vi -
(m3/kg)
Specific Enthalpy Specific Entropy 50 K 100 K
saturated liquid
- hf -
(kJ/kg)
saturated vapor
- hg -
(kJ/kg)
saturated liquid
- sf -
(kJ/kgK)
saturated vapor
- sg -
(kJ/kgK)
Specific Enthalpy
- h -
(kJ/kg)
Specific Entropy
- s -
(kJ/kgK)
Specific Enthalpy
- h -
(kJ/kg)
Specific Entropy
- s -
(kJ/kgK)
-50 0.4089 2.625 -44.4 1373.3 -0.194 6.159 1479.8 6.592 1585.9 6.948
-45 0.5454 2.005 -22.3 1381.6 -0.096 6.057 1489.3 6.486 1596.1 6.839
-40 0.7177 1.552 0 1390.0 0 5.962 1498.6 6.387 1606.3 6.736
-35 0.9322 1.216 22.3 1397.9 0.095 5.872 1507.9 6.293 1616.3 6.639
-30 1.196 0.9633 44.7 1405.6 0.188 5.785 1517.0 6.203 1626.3 6.547
-28 1.317 0.8809 53.6 1408.5 0.224 5.751 1520.7 6.169 1630.3 6.512
-26 1.447 0.8058 62.6 1411.4 0.261 5.718 1524.3 6.135 1634.2 6.477
-24 1.588 0.7389 71.7 1414.3 0.297 5.686 1527.9 6.103 1638.2 6.444
-22 1.740 0.6783 80.8 1417.3 0.333 5.655 1531.4 6.071 1642.2 6.411
-20 1.902 0.6237 89.8 1420.0 0.368 5.623 1534.8 6.039 1646.0 6.379
-18 2.077 0.5743 98.8 1422.7 0.404 5.593 1538.2 6.008 1650.0 6.347
-16 2.265 0.5296 107.9 1425.3 0.440 5.563 1541.7 5.978 1653.8 6.316
-14 2.465 0.4890 117.0 1427.9 0.475 5.533 1545.1 5.948 1657.7 6.286
-12 2.680 0.4521 126.2 1430.5 0.510 5.504 1548.5 5.919 1661.5 6.256
-10 2.908 0.4185 135.4 1433.0 0.544 5.475 1551.7 5.891 1665.3 6.227
-8 3.153 0.3879 144.5 1435.3 0.579 5.447 1554.9 5.863 1669.0 6.199
-6 3.413 0.3599 153.6 1437.6 0.613 5.419 1558.2 5.836 1672.8 6.171
-4 3.691 0.3344 162.8 1439.9 0.647 5.392 1561.4 5.808 1676.4 6.143
-2 3.983 0.3110 172.0 1442.2 0.681 5.365 1564.6 5.782 1680.1 6.116
0 4.295 0.2895 181.2 1444.4 0.715 5.340 1567.8 5.756 1683.9 6.090
2 4.625 0.2699 190.4 1446.5 0.749 5.314 1570.9 5.731 1687.5 6.065
4 4.975 0.2517 199.7 1448.5 0.782 5.288 1574.0 5.706 1691.2 6.040
6 5.346 0.2351 209.1 1450.6 0.816 5.263 1577.0 5.682 1694.9 6.015
8 5.736 0.2198 218.5 1452.5 0.849 5.238 1580.1 5.658 1698.4 5.991
10 6.149 0.2056 227.8 1454.3 0.881 5.213 1583.1 5.634 1702.2 5.967
12 6.585 0.1926 237.2 1456.1 0.914 5.189 1586.0 5.611 1705.7 5.943
14 7.045 0.1805 246.6 1457.8 0.947 5.165 1588.9 5.588 1709.1 5.920
16 7.529 0.1693 256.0 1459.5 0.979 5.141 1591.7 5.565 1712.5 5.898
18 8.035 0.1590 265.5 1461.1 1.012 5.118 1594.4 5.543 1715.9 5.876
20 8.570 0.1494 275.1 1462.6 1.044 5.095 1597.2 5.521 1719.3 5.854
22 9.134 0.1405 284.6 1463.9 1.076 5.072 1600.0 5.499 1722.8 5.832
24 9.722 0.1322 294.1 1465.2 1.108 5.049 1602.7 5.478 1726.3 5.811
26 10.34 0.1245 303.7 1466.5 1.140 5.027 1605.3 5.458 1729.6 5.790
28 10.99 0.1173 313.4 1467.8 1.172 5.005 1608.0 5.437 1732.7 5.770
30 11.67 0.1106 323.1 1468.9 1.204 4.984 1610.5 5.417 1735.9 5.750
32 12.37 0.1044 332.8 1469.9 1.235 4.962 1613.0 5.397 1739.3 5.731
34 13.11 0.0986 342.5 1470.8 1.267 4.940 1615.4 5.378 1742.6 5.711
36 13.89 0.0931 352.3 1471.8 1.298 4.919 1617.8 5.358 1745.7 5.692
38 14.70 0.0880 362.1 1472.6 1.329 4.898 1620.1 5.340 1748.7 5.674
40 15.54 0.0833 371.9 1473.3 1.360 4.877 1622.4 5.321 1751.9 5.655
42 16.42 0.0788 381.8 1473.8 1.391 4.856 1624.6 5.302 1755.0 5.637
44 17.34 0.0746 391.8 1474.2 1.422 4.835 1626.8 5.284 1758.0 5.619
46 18.30 0.0706 401.8 1474.5 1.453 4.814 1629.0 5.266 1761.0 5.602
48 19.29 0.0670 411.9 1474.7 1.484 4.793 1631.1 5.248 1764.0 5.584
50 20.33 0.0635 421.9 1474.7 1.515 4.773 1633.1 5.230 1766.8 5.567
  • Ammonia Molecular weight : 17.03 g/mol
  • Ammonia Melting point : -78oC
  • Ammonia Latent heat of fusion (1,013 bar, at triple point) : 331.37 kJ/kg
  • Ammonia Liquid Density (1.013 bar at boiling point) : 682 kg/m3 (250 K : 669 kg/m3) (300 K : 600 kg/m3) (400 K : 346 kg/m3)
  • Ammonia Liquid Specific Heat (cp) (250 K : 4.52 kJ/kg.K) (300 K : 4.75 kJ/kg.K) (400 K : 6.91 kJ/kg.K)
  • Ammonia Liquid/gas equivalent (1.013 bar and 15oC (59oF)) : 947 vol/vol
  • Ammonia Liquid Dynamic (Absolute) Viscosity (223K (-50oC): 3.061 10-4 Ns/m2) (273K (0oC): 2.388 10-4 Ns/m2) (323K (50oC): 1.862 10-4 Ns/m2)
  • Ammonia Liquid Thermal Conductivity (250 K : 592 106 kW/m.K) (300 K : 477 106 kW/m.K) (400 K : 207 106 kW/m.K)
  • Ammonia Boiling point (1.013 bar) : -33.5oC
  • Ammonia Latent heat of vaporization (1.013 bar at boiling point) : 1371.2 kJ/kg
  • Ammonia Vapor pressure (at 21oC or 70oF) : 8.88 bar
  • Ammonia Critical point - Critical temperature : 132.4oC - Critical pressure : 112.8 bar
  • Ammonia Gas Density (1.013 bar at boiling point) : 0.86 kg/m3
  • Ammonia Gas Density (1.013 bar and 15oC (59oF)) : 0.73 kg/m3
  • Ammonia Gas Compressibility Factor (Z) (the ratio of the actual volume of the gas to the volume determined according to the perfect gas law) (1.013 bar and 15oC (59oF)) : 0.9929
  • Ammonia Gas Specific Gravity (air = 1) (1.013 bar and 21oC (70oF)) : 0.597
  • Ammonia Gas Specific volume (1.013 bar and 21oC (70oF)) : 1.411 m3/kg
  • Ammonia Gas Specific Heat at constant pressure (cp) (1.013 bar and 15oC (59oF)) : 0.037 kJ/(mol.K)
  • Ammonia Gas Specific Heat at constant volume (cv) (1.013 bar and 15oC (59oF)) : 0.028 kJ/(mol.K)
  • Ammonia Gas Ratio of Specific Heats (Gamma: cp/cv) (1.013 bar and 15oC (59oF)) : 1.309623
  • Ammonia Gas Dynamic Viscosity (1.013 bar and 0oC (32oF)) : 0.000098 Poise
  • Ammonia Gas Thermal conductivity (1.013 bar and 0oC (32oF)) : 22.19 mW/(m.K)
  • Ammonia Gas Solubility in water (1.013 bar and 0oC (32oF)) : 862 vol/vol
  • Ammonia Gas Autoignition temperature : 630oC

Related Topics

  • Air Conditioning - Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort

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