## 7 Analysis of Working Fluids for Low-Temperature ORC
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & & \multirow{2}{*}{**Ozone Depletion Potential**} & \multirow{2}{*}{**Boiling Potential**} & \multirow{2}{*}{**Molecular Weight**} & \multirow{2}{*}{**Temper.**} & \multirow{2}{*}{**Critical Pressure**} & \multirow{2}{*}{**Critical Pressure**} \\  & & & & & & & & \\  & & & & & & & & \\  & & & & & & & & \\ \hline \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \\  & & & & & & & & \\ \hline
1 & HC270 & Cyclopropane & 0 & 0 & \(-\)32.75 & 42.08 & 125.15 & 5.58 & 366.18 \\
2 & R21 & Dichlorofluoromethane & 0.01 & 151 & 8.92 & 102.92 & 178.33 & 5.18 & 216.17 \\
3 & R22 & Chlorofluoromethane & 0.05 & 1810 & \(-\)9.10 & 64.48 & 96.15 & 4.99 & 158.46 \\
4 & R23a & Trifluoromethane & 0 & 14760 & \(-\)82.10 & 70.01 & 26.14 & 4.83 & 89.69 \\
5 & R32 & Dilofluoromethane & 0 & 675 & \(-\)52.15 & 52.02 & 78.11 & 5.78 & 218.59 \\
6 & R41 & Fluoromethane & 0 & 92 & \(-\)78.15 & 34.03 & 44.13 & 5.9 & 270.04 \\
7 & R116a & Hexafluoroethane & 0 & 12200 & \(-\)78.00 & 138.01 & 19.88 & 3.05 & 30.69 \\
8 & R123 & 2,2-Dichloro-1,1-trifluoroet. & 0.02 & 77 & 27.00 & 152.93 & 183.68 & 3.66 & 161.82 \\
9 & R124 & 2-Chloro-1,1,1-2-tetrafluoroet. & 0.02 & 609 & \(-\)120.0 & 136.48 & 122.28 & 3.62 & 132.97 \\
10 & R125 & Pentafluoroethane & 0 & 3500 & \(-\)49.00 & 120.02 & 66.02 & 3.62 & 81.49 \\
11 & R134a & 1,1,1-Z-tetrafluoromethane & 0 & 1430 & \(-\)26.07 & 102.03 & 101.06 & 4.06 & 158.42 \\
12 & R141b & 1,1-Dichloro-1-fluorethane & 0.12 & 725 & 32.05 & 116.95 & 204.35 & 4.21 & 215.13 \\
13 & R142b & 1-Chloro-1,1-difluorethane & 0.07 & 2310 & \(-\)10.00 & 100.5 & 137.11 & 4.06 & 185.69 \\
14 & R143a & 1,1,1-Trifluoromethane & 0 & 4470 & \(-\)47.00 & 84.04 & 72.71 & 3.76 & 124.81 \\
15 & R152a & 1,1-Difluorethane & 1 & 140 & \(-\)24.65 & 66.05 & 113.26 & 4.52 & 249.67 \\
16 & R170a & 1,0,2,0 & 20 & \(-\)88.55 & 30.07 & 32.18 & 4.87 & 223.43 \\
17 & R218 & Octafluoropropane & 0 & 8830 & \(-\)37.00 & 188.02 & 71.87 & 2.64 & 58.29 \\
18 & R227 ea & 1,1,1,2,3,3-Hepfluoroprop. & 0 & 3220 & \(-\)15.61 & 170.03 & 102.80 & 2.93 & 97.14 \\
19 & R236 ea & 1,1,2,3,3-Hexafluoroprop. & 0 & 6300 & 6.19 & 152.04 & 139.29 & 3.5 & 142.98 \\
20 & R245 ca & 1,1,2,2,3-Pentalfluoropropane & 0 & 693 & 25.00 & 134.05 & 174.42 & 3.93 & 188.64 \\
21 & R245 fa & 1,1,3,3-Pentalfluoropropane & 0 & 1030 & 58.80 & 134.05 & 154.05 & 3.64 & 177.08 \\
22 & R290 & Propane & 0 & 20 & \(-\)24.21 & 44.1 & 96.68 & 4.25 & 292.13 \\
23 & RC318 & Octafluorocyclobutane & 0 & 10250 & \(-\)5.85 & 200.03 & 115.23 & 2.78 & 93.95 \\
24 & R3-1-0 & Decentralizedfluoromethane & 8860 & \(-\)2.00 & 238.03 & 113.18 & 2.32 & 77.95 \\
25 & FC4-1-12 & Dodecafluoromethane & 9160 & 27.85 & 288.03 & 147.41 & 2.05 & 86.11 \\
26 & R600 & Butane & 20 & \(-\)0.49 & 58.12 & 151.98 & 3.8 & 336.82 \\
27 & R600a & Isobutane & 0 & 20 & \(-\)12.00 & 58.12 & 134.66 & 3.66 & 303.44 \\
28 & R601 & Pentane & 0 & 20 & 36.06 & 72.15 & 196.55 & 3.37 & 349 \\
29 & R601a & Isopentane & 0 & 20 & 27.83 & 72.15 & 187.25 & 3.38 & 343.28 \\
30 & R717 & Ammonia & 0 & 0 & \(-\)33.00 & 17.03 & 132.25 & 11.33 & 1064.38 \\
31 & R744 & Carbon dioxide & 0 & 1 & \(-\)78.45 & 44.01 & 30.98 & 7.38 & 167.53 \\
32 & R1270 & Propyne & 0 & 20 & 48.00 & 42.08 & 92.42 & 4.66 & 284.34 \\
33 & Propyne & & & \(-\)23.20 & 40.06 & 129.23 & 5.63 & 431.61 \\
34 & R32 & Difluoromethane & 0 & 675 & \(-\)52.00 & 52.02 & 78.11 & 5.782 & 218.59 \\
35 & R152a & 1,1-Difluorethane & 0 & 124 & \(-\)25.00 & 66.05 & 113.26 & 4.515 & 317.94 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Working fluid selection for low-grade heat exploitation. fluids with high critical temperatures represent the most suitable choice for constrained target temperatures. However, it is impossible to define a single optimal ORC working fluid for specific thermal sources and applications, owing to the numerous available selection criteria and organic fluids [94].