Pre-scan lines to identify "isolated" ones — short lines (1-6 words)
with paragraph breaks both before AND after. These are heading
candidates even at body font size, common in academic papers
("Acknowledgements", "Limitations", "B.3 Prompt Engineering").
Inspired by opendataloader's HeadingProcessor which passes prevNode
and nextNode context to the heading probability scorer.
The isolated signal (+0.3) combines with rarity/bold/standalone
signals. A per-page density guard prevents false positives on
multi-column pages where many lines appear isolated. Continuation
word detection (ending in "the", "and", etc.) filters wrapped
paragraph lines.
MHS=0 docs: 18→13. MHS-S +0.004. No regressions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
5.6 KiB
Technical Information
l T-12 SI
DuPont Fluorochemicals
Thermodynamic Properties
of
®
Freon 12
(R-12) Technical Information Technical Information
® Thermodynamic Properties of Freon 12 Refrigerant (R-12) SI Units
Tables of the thermodynamic Units properties of R-12 have been developed and are presented here. P = Pressure in kPa. Absolute This information is based on values calculated using the NIST REFPROP T = Temperature in Celcius Database (McLinden, M.O., Klein,
S.A., Lemmon, E.W., and Peskin, Vf = Fluid (liquid) specific volume A.P., NIST Standard Reference in cubic meters per kilogram Database 23, NIST thermodynamic and transport properties of Vg = Vapour (gas) specific volume refrigerants and refrigerant in cubic meters per kilogram mixtures – REFPROP version 6.01, Standard Reference Data Program, df and dg = Fluid and Vapour National Institute of Standards and (respectively) densities in Technology, 1998). kilograms per cubic meter
H = Enthalpy (kJ/kg)
S = Entropy (kJ/kg.K)
Physical Properties
| Chemical Formula | CCl2F2 |
|---|---|
| Molecular mass | 120.91 |
| Boiling Point At one atmosphere | -29.75°C |
| Critical Temperature | 111.97°C |
| Critical Pressure | 4136 kPa |
| Critical Density | 565.0 kg/m |
| Critical Volume | 0.0018 m |
/kg
l
TABLE 1
Freon ® 12 Saturation Properties-Temperature Table
| Temp | Pressure | Volume | Density | Enthalpy | Entropy | Temp | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | [kPa] | [m3 Liquid v f | /kg] | Vapour v g | Liquid d f | [kg/m3] Vapour d g | Liquid H f | [kJ/kg] Latent H fg | Vapour H g | Liquid S f | [kJ/K-kg] Vapour S g | °C |
| -100 | 1.2 | 0.0006 | 10.0000 | 1679.0 | 0.100 | 113.3 | 192.8 | 306.1 | 0.6077 | 1.7210 | -100 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -99 | 1.3 | 0.0006 | 9.1670 | 1677.0 | 0.109 | 114.1 | 192.4 | 306.5 | 0.6124 | 1.7170 | -99 |
| -98 | 1.4 | 0.0006 | 8.4100 | 1674.0 | 0.119 | 115.0 | 192.0 | 307.0 | 0.6171 | 1.7130 | -98 |
| -97 | 1.6 | 0.0006 | 7.7250 | 1671.0 | 0.129 | 115.8 | 191.6 | 307.4 | 0.6218 | 1.7100 | -97 |
| -96 | 1.7 | 0.0006 | 7.1040 | 1669.0 | 0.141 | 116.6 | 191.3 | 307.9 | 0.6264 | 1.7060 | -96 |
| -95 | 1.9 | 0.0006 | 6.5400 | 1666.0 | 0.153 | 117.4 | 190.9 | 308.3 | 0.6310 | 1.7030 | -95 |
| -94 | 2.0 | 0.0006 | 6.0270 | 1663.0 | 0.166 | 118.2 | 190.6 | 308.8 | 0.6356 | 1.6990 | -94 |
| -93 | 2.2 | 0.0006 | 5.5610 | 1661.0 | 0.180 | 119.1 | 190.1 | 309.2 | 0.6402 | 1.6960 | -93 |
| -92 | 2.4 | 0.0006 | 5.1360 | 1658.0 | 0.195 | 119.9 | 189.8 | 309.7 | 0.6448 | 1.6920 | -92 |
| -91 | 2.6 | 0.0006 | 4.7480 | 1655.0 | 0.211 | 120.7 | 189.4 | 310.1 | 0.6493 | 1.6890 | -91 |
| -90 | 2.9 | 0.0006 | 4.3950 | 1653.0 | 0.228 | 121.5 | 189.1 | 310.6 | 0.6538 | 1.6860 | -90 |
| -89 | 3.1 | 0.0006 | 4.0720 | 1650.0 | 0.246 | 122.4 | 188.6 | 311.0 | 0.6583 | 1.6830 | -89 |
| -88 | 3.4 | 0.0006 | 3.7760 | 1648.0 | 0.265 | 123.2 | 188.3 | 311.5 | 0.6628 | 1.6800 | -88 |
| -87 | 3.6 | 0.0006 | 3.5050 | 1645.0 | 0.285 | 124.0 | 188.0 | 312.0 | 0.6672 | 1.6770 | -87 |
| -86 | 3.9 | 0.0006 | 3.2570 | 1642.0 | 0.307 | 124.8 | 187.6 | 312.4 | 0.6716 | 1.6740 | -86 |
| -85 | 4.3 | 0.0006 | 3.0290 | 1640.0 | 0.330 | 125.7 | 187.2 | 312.9 | 0.6761 | 1.6710 | -85 |
| -84 | 4.6 | 0.0006 | 2.8190 | 1637.0 | 0.355 | 126.5 | 186.8 | 313.3 | 0.6804 | 1.6680 | -84 |
| -83 | 5.0 | 0.0006 | 2.6270 | 1634.0 | 0.381 | 127.3 | 186.5 | 313.8 | 0.6848 | 1.6660 | -83 |
| -82 | 5.3 | 0.0006 | 2.4490 | 1632.0 | 0.408 | 128.1 | 186.2 | 314.3 | 0.6892 | 1.6630 | -82 |
| -81 | 5.8 | 0.0006 | 2.2860 | 1629.0 | 0.437 | 129.0 | 185.7 | 314.7 | 0.6935 | 1.6600 | -81 |
| -80 | 6.2 | 0.0006 | 2.1360 | 1626.0 | 0.468 | 129.8 | 185.4 | 315.2 | 0.6978 | 1.6580 | -80 |
| -79 | 6.7 | 0.0006 | 1.9970 | 1624.0 | 0.501 | 130.6 | 185.1 | 315.7 | 0.7021 | 1.6550 | -79 |
| -78 | 7.1 | 0.0006 | 1.8680 | 1621.0 | 0.535 | 131.5 | 184.6 | 316.1 | 0.7064 | 1.6530 | -78 |
| -77 | 7.7 | 0.0006 | 1.7490 | 1618.0 | 0.572 | 132.3 | 184.3 | 316.6 | 0.7106 | 1.6500 | -77 |
| -76 | 8.2 | 0.0006 | 1.6390 | 1616.0 | 0.610 | 133.1 | 184.0 | 317.1 | 0.7149 | 1.6480 | -76 |
| -75 | 8.8 | 0.0006 | 1.5380 | 1613.0 | 0.650 | 134.0 | 183.5 | 317.5 | 0.7191 | 1.6450 | -75 |
| -74 | 9.4 | 0.0006 | 1.4430 | 1610.0 | 0.693 | 134.8 | 183.2 | 318.0 | 0.7233 | 1.6430 | -74 |
| -73 | 10.1 | 0.0006 | 1.3560 | 1608.0 | 0.738 | 135.6 | 182.9 | 318.5 | 0.7275 | 1.6410 | -73 |
| -72 | 10.8 | 0.0006 | 1.2740 | 1605.0 | 0.785 | 136.5 | 182.4 | 318.9 | 0.7317 | 1.6390 | -72 |
| -71 | 11.5 | 0.0006 | 1.1990 | 1602.0 | 0.834 | 137.3 | 182.1 | 319.4 | 0.7358 | 1.6370 | -71 |
| -70 | 12.3 | 0.0006 | 1.1290 | 1600.0 | 0.886 | 138.2 | 181.7 | 319.9 | 0.7400 | 1.6340 | -70 |
| -69 | 13.1 | 0.0006 | 1.0630 | 1597.0 | 0.941 | 139.0 | 181.3 | 320.3 | 0.7441 | 1.6320 | -69 |
| -68 | 14.0 | 0.0006 | 1.0020 | 1594.0 | 0.998 | 139.8 | 181.0 | 320.8 | 0.7482 | 1.6300 | -68 |
| -67 | 14.9 | 0.0006 | 0.9455 | 1591.0 | 1.058 | 140.7 | 180.6 | 321.3 | 0.7523 | 1.6280 | -67 |
| -66 | 15.8 | 0.0006 | 0.8925 | 1589.0 | 1.120 | 141.5 | 180.3 | 321.8 | 0.7564 | 1.6260 | -66 |
| -65 | 16.8 | 0.0006 | 0.8430 | 1586.0 | 1.186 | 142.4 | 179.8 | 322.2 | 0.7604 | 1.6250 | -65 |
| -64 | 17.9 | 0.0006 | 0.7968 | 1583.0 | 1.255 | 143.2 | 179.5 | 322.7 | 0.7645 | 1.6230 | -64 |
| -63 | 19.0 | 0.0006 | 0.7536 | 1581.0 | 1.327 | 144.1 | 179.1 | 323.2 | 0.7685 | 1.6210 | -63 |
| -62 | 20.1 | 0.0006 | 0.7132 | 1578.0 | 1.402 | 144.9 | 178.8 | 323.7 | 0.7726 | 1.6190 | -62 |
| -61 | 21.3 | 0.0006 | 0.6754 | 1575.0 | 1.481 | 145.8 | 178.3 | 324.1 | 0.7766 | 1.6170 | -61 |
| -60 | 22.6 | 0.0006 | 0.6399 | 1572.0 | 1.563 | 146.6 | 178.0 | 324.6 | 0.7806 | 1.6160 | -60 |
| -59 | 24.0 | 0.0006 | 0.6067 | 1570.0 | 1.648 | 147.5 | 177.6 | 325.1 | 0.7845 | 1.6140 | -59 |
| -58 | 25.4 | 0.0006 | 0.5755 | 1567.0 | 1.738 | 148.3 | 177.3 | 325.6 | 0.7885 | 1.6120 | -58 |
| -57 | 26.8 | 0.0006 | 0.5463 | 1564.0 | 1.831 | 149.2 | 176.8 | 326.0 | 0.7924 | 1.6110 | -57 |
| -56 | 28.4 | 0.0006 | 0.5188 | 1561.0 | 1.928 | 150.0 | 176.5 | 326.5 | 0.7964 | 1.6090 | -56 |
| -55 | 30.0 | 0.0006 | 0.4930 | 1559.0 | 2.029 | 150.9 | 176.1 | 327.0 | 0.8003 | 1.6080 | -55 |
| -54 | 31.6 | 0.0006 | 0.4687 | 1556.0 | 2.134 | 151.7 | 175.8 | 327.5 | 0.8042 | 1.6060 | -54 |
| -53 | 33.4 | 0.0006 | 0.4458 | 1553.0 | 2.243 | 152.6 | 175.4 | 328.0 | 0.8081 | 1.6050 | -53 |
| -52 | 35.2 | 0.0007 | 0.4243 | 1550.0 | 2.357 | 153.5 | 174.9 | 328.4 | 0.8120 | 1.6030 | -52 |
| -51 | 37.1 | 0.0007 | 0.4040 | 1548.0 | 2.475 | 154.3 | 174.6 | 328.9 | 0.8159 | 1.6020 | -51 |
| -50 | 39.1 | 0.0007 | 0.3849 | 1545.0 | 2.598 | 155.2 | 174.2 | 329.4 | 0.8197 | 1.6000 | -50 |
| -49 | 41.2 | 0.0007 | 0.3669 | 1542.0 | 2.725 | 156.0 | 173.9 | 329.9 | 0.8236 | 1.5990 | -49 |
| -48 | 43.4 | 0.0007 | 0.3499 | 1539.0 | 2.858 | 156.9 | 173.4 | 330.3 | 0.8274 | 1.5980 | -48 |
| -47 | 45.6 | 0.0007 | 0.3339 | 1536.0 | 2.995 | 157.8 | 173.0 | 330.8 | 0.8313 | 1.5960 | -47 |