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HEATING VENTILATINC AIR CONDITIONING GUIDE 1942 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 (Millipoise) 80 F 180 F Partial Heat of Mixing At 0 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 Hg) 0 0.0 1.000 8.61 3.48 0.00 0.000 0.998 212.0 32.0 2 7.8 1.037 11.19 4.56 2.04 -0.014 0.901 215.8 16.3 4 14.5 1.076 14.42 6.01 7.24 -0.036 0.831 221.5 - 5.8 6 20.2 1.111 18.62 7.78 16.70 -0.069 0.778 228.9 -34.2 8 25.3 1.143 24.32 10.00 31.90 -0.109 0.739 238.1 -69.0 10 29.7 1.172 32.28 12.91 51.10 -0.143 0.710 248.4 -90.0 12 33.7 1.199 43.45 16.56 75.70 -0.160 0.687 258.8 -40.0 14 37.4 1.225 60.26 21.28 90.80 -0.167 0.666 268.9 1.0 16 40.4 1.248 82.04 27.10 124.80 -0.176 0.647 277.9 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 DewPoint at Zero Conc. 2.0 4.0 6.0 8.0 Concentration or Lithium Chloride 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 30.0 320 315.2 308.7 299.9 290.2 279.7 269.4 259.6 251.5 244.1 236.5 230.0 223.8 218.6 214.5 210.3 300 295.4 289.1 280.5 270.9 260.6 250.5 240.8 232.6 225.4 218.0 211.8 205.8 200.8 196.9 192.8 280 275.6 269-5 261.1 251.7 241-5 231.6 222.2 214.0 206.7 199.7 193.5 187.8 183.2 1793 175.2 260 255.8 250.0 241.9 232.6 222.7 212.8 203.5 195.5 188.4 181.7 175.4 170.0 165.6 162.0 158.4 240 236.0 230.4 222.5 213.5 203.8 194.2 185.0 177.1 170.0 163.6 157.5 152.2 148.3 144.6 140.5 220 216.2 210.8 203.2 194.4 184.9 175.5 166.4 158.6 151.6 145.3 139.6 134.6 130.7 1273 124.2 200 196.4 191.2 183.9 175.4 166.1 156.7 148.0 1403 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 96.0 160 156.8 152.1 145.4 137.4 128.6 119.7 111.3 103.9 97.4 91.6 86.6 82.2 140 137.0 132.6 126.1 118.4 109.9 101.3 93.1 85.9 79.5 73.8 69.0 120 117.2 113.0 106.8 99.4 91.1 82.7 74.7 67.8 61.5 56.0 110 1073 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 63.3 55.2 47.6 40.8 34.8 29.3 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 0 -4.5 -8.6 -13.9 -20.2 -27.0 -33.3 468 CHAPTER 24. COOLING, DEHUMIDIFICATION AND DEHYDRATION Example 1. Determine the dew-point, wet-bulb, relative humidity and absolute hu midity of air 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 AT. From Fig. 2 the dew-point of 18 AT lithium chloride at 100 F is 43.7 F. From Table 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 AT 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 AT 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 AT 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 + 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 AT 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 469