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HEATING VENTILATING AIR CONDITIONING CUIDE 1941 Table 1. Properties of Lithium Chloride Solutions Concen tration Pound Mols (42.4 Lb) LiCl PER 1000 Lb Water Concen tration Per Cent by Weight Specific Gravity AT 100 F Viscosity (Milupoise) 80 F iaoF Partial Heat of Mixing AtO f. Btu per Lb Temp. Coeff. OF Partial Heat of Mixing Btu per Lb per F Specific Heat at 70 F Boiling Point F Freezing AT Point. (760 MM F He) 0 2 4 0.0 7.8 14.5 1.000 1.037 1.076 8.61 11.19 14.42 3.48 4.56 6.01 0.00 0.000 0.998 2.04 -0.014 0.901 7.24 -0.036 0.831 212.0 215.8 221.5 32.0 16.3 - 5.8 6 8 10 20.2 25.3 29.7 1.111 1.143 1.172 18.62 24.32 32.28 7.78 10.00 12.91 16.70 -0.069 0.778 31.90 -0.109 0.739 51.10 -0.143 0.710 228.9 238.1 248.4 -34.2 -69.0 -90.6 12 14 16 33.7 37.4 40.4 1.199 1.225 1.248 43.45 60.26 82.04 16.56 21.28 27.10 75.70 -0.160 0.687 90.80 -0.167 0.666 124.80 -0.176 0.647 258.8 268.9 277.9 -40.0 1.0 36.5 18 43.3 1.270 113.80 35.48 145.00 -0.186 0.631 285.8 58.1 20 46.0 1.291 46.45 162.00 -0.194 293.2 86.4 22 48.4 24 50.3 26 52.4 28 54.3 30 56.1 32 57.5 60.67 84.33 171.00 177.00 182.00 191.00 194.00 198.00 -0.200 -0.200 -0.210 -0.210 -0.210 -0.220 300.2 307.0 313.0 318.0 323.0 328.0 133.0 156.0 . 180;0 190.0 195.0 280.0 Table 2. Dew-Point of Air in Equilibrium with Lithium Chloride Solutions Concentration in Pound Mols (42.4 lb) Lithium Chloride per 1000 lb Water Dew- Point AT Zero CoNC. 2.0 4.0 6.0 8.0 CoifCBSTBATtoit or Lremvu Chloride 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 30.0 320315.:2308.7299.9 290.2 279.7 269.4 259.6 251.5 244.1 236.5 230.0 223.8 218.6 214.5 2103 3000295 .4)289.1280.5 270.9 260.6 250.5 240.8 232.6 225.4 218.0 211.8 205.8 200.8 196.9 1923 280275.61269.5 261.1 251.7 241.5 231.6 222.2 214.0 206.7 199.7 193.5 187.8 183.2 1793 175.2 260255.8250..0241.9 232.6 222.7 212.8 2033 195.5 188.4 181.7 175.4 170.0 165.6 162.0 158.4 240236.0(230..4222.5 213.5 203.8 194.2 185.0 177.1 170.0 163.6 157.5 152.2 1483 144.6 140.5 220216.,21210.8203.2 194.4 184.9 1753 166.4 158.6 151.6 145.3 139.6 134.6 130.7 127.3 124.2 200196.41191.2 183.9 175.4 166.1 156.7 148.0 140.3 133.5 127.3 121.9 117.0 113.3 110.1 180(176.6)171.6(164.7 156.4 147-3 138.1 129.6 122.1 115.5 109.4 104.2 99.6 96.0 160156.81.52.1 145.4 137.4 128.6 119.7 1113 103.9 97.4 91.6 86.6 82.2 140(137.01 32.6 126.1 118.4 109.9 1013 93.1 85.9 793 73.8 69.0 1201 17.2 113.0106.8 99.4 91.1 82.7 74.7 67.8 61.5 56.0 1101073 103.2 97.2 89.9 81.9 73.5 65.6 58.8 52.6 47.1 100 97.4 93.4 87.5 80.5 72.7 64.4 56.6 49.8 43.7 38.2 90 87.5 83.6 77.9 71.0 633 55.2 47.6 40.8 34.8 293 80 77.6 73.8 68.4 61.6 54.0 46.1 38.5 31.8 25.9 20.6 70 67.7 64.0 58.7 52.2 44.8 37.0 29.5 22.9 17.2 12.0 60 57.8 54.3 49.1 42.7 35.5 27.9 20.5 14.0 8.3 40 38.0 34.7 29.9 23.9 16.9 9.6 2.4 -3.9 20 15.1 10.7 5.0 -1.7 -8.7 -15.4 l -4.5 -8.6 -13.9 -20.2 -27.0 -33.3 432 CHAPTER 23. COOLING, DEHUMIDIFICATION AND DEHYDRATION Example 1. Determine the dew-point, wet-bulb, relative humidity and absolute hu midity. ofair in equilibrium at 100 F with pure lithium chloride solution of density 1.270. Solution. From Table 1 the concentration of a solution of density 1.270 at 100 F is 18.0 M. From Fig. 2 the dew-point of 18 M lithium chloride at 100 F is 43.7 F. From -fable 6, Chapter 1, the partial pressure of water over the solution is 0.2858 in. of Hg, and the absolute humidity is 42.00 grains per pound dry air. From the psychrometric chart, the wet-bulb is 66.3 F, and the relative humidity is 15 per cent. Example S. Determine the boiling point, and freezing point of 18 M lithium chloride solutions. ... ,, Solution. From Table 1, boiling point (standard) is 285.8 F, freezing point is 58.1 F. Fig. 3. Temperature--Pressure--Concentrations for Calcium Chloride Example S. Calculate the heat of vaporization of 1 lb of water from a large amount of 18 M lithium chloride solution at the boiling point. Solution. The heat of boiling is equal to the heat of mixing plus the heat of boiling pure water at the same temperature. The heat of mixing from Table 1 at 18 M and 285.8 F is 145 -- (0.186 X 285.8) = 92 Btu per pound. The heat of vaporization of water from steam tables at 285.8 F is 920 Btu per pound. Therefore the heat of vaporiza tion of water from the solution is 920 -f- 92 = 1012 Btu per pound. Example 4. One thousand pounds of air per minute at 100 F dry-bulb with a dew point of 70 F and a relative-humidity of 39 per cent is passed over 18 M lithium chloride solution. The rate of flow of the solution is 200 gpm and the entering temperature is 80 F. The air leaves the absorber at 85 F dry-bulb and dew-point of 35 F. Calculate 433