Document wDoJrxVmgJrXyKkYMXon7BL4

American Society of Heating and Ventilating Engineers Guide, 1934 Table 1. Properties of Dry Air3 Barometric Pressure 29.921 In. Temperature Deo F 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 180 200 220 240 260 280 300 350 400 450 500 550 600 700 800 900 1000 Weight pee Ctj Ft Pounds 0.08636 0.08453 0.08276 0.08107 0.07945 0.07788 0.07640 0.07495 0.07356 0.07222 0.07093 0.06968 0.06848 0.06732 0.06620 0.06510 0.06406 0.06205 0.06018 0.05840 0.05673 0.05516 0.05367 0.05225 0.04903 0.04618 0.04368 0.04138 0.03932 0.03746 0.03423 0.03151 0.02920 . . 0.02720 Pee Cent of Volume at 70 F 0.8680 . 0.8867 0.9057 0.9246 0.9434 0.9624 0.9811 1.0000 1.0190 1.0380 1.0570 1.0756 1.0945 1.1133 1.1320 1.1512 1.1700 1.2080 1.2455 1.2833 1.3212 1.3590 1.3967 1.4345 1.5288 1.6230 1.7177 1.8113 1.9060 2.0010 2.1900 2.3785 2.5670 2.7560 Btu Absorbed bt One Cu Ft Dbt Am peb Deg F 0.02080 0.02039 0.01998 0.01957 0.01919 0.01881 0.01846 0.01812 0.01779 0.01747 0.01716 0.01687 0.01659 0.01631 0.01605 0.01578 0.01554 0.01506 0.01462 0.01419 0.01380 0.01343 0.01308 . 0.01274 0.01197 0.01130 0.01070 0.01018 0.00967 0.00923 0.00847 0.00782 0.00728 0.00680 Cu Ft Dbt Air Wabmed One Degbeb peb Btu 48.08 49.05 50.05 51.10 52.11 53.17 54.18 55.19 56.21 57.25 58.28 59.28 60.28 61.32 62.31 63.37 64.35 66.40 68.41 70.48 72.46 74.46 76.46 78.50 83.55 88.50 93.46 98.24 103.42 108.35 118.07 127.88 137.37 147:07 From Fan Engineering. 578 Chapter 41--Properties of Air, Water and Steam a given weight of gas varies inversely as its absolute pressure. Hence, if Pi and Pj represent the initial and final absolute pressures, and Vi and Vi represent corresponding volumes of the same mass, say one pound of Vx Pi gas, then = 5-, or Pi Vi = Ps V2, but since Pi Vi for any given case is Vi JT\ a definite constant quantity, it follows that the product of the absolute pressure and volume of a gas is a constant, or PV = C, when T is kept Table 2. Properties of Saturated Air3 Weights of Air, Vapor of Water, and Saturated Mixture of Air and Vapor at 29.921 Inches of Mercury Deo F Weight in a Cubic Foot op Mixture Bin Absobbed bt Cubic Feet Sat. One Cubic Foot Am Wabmed One Weight or Weight op Total Weight op Sat. Aib per Degree peb Dbt Am Vapor THE MlXTUBE Deg F Btu Pounds Pounds Pounds Specific Heat Btu peb Pound op Mixture 0 0.08625 0.000068 0.08632 10 0.08433 0.000110 0.08444 20 0.08246 0.000176 ' 0.08264 30 0.08062 0.000277 0.08090 40 0.07878 0.000409 0.07919 50 0.07694 0.000587 0.07753 60 0.07506 0.000828 0.07589 70 0.07310 0.001151 0.07425 80 0.07103 0.001578 0.07261 90 0.06879 0.002134 0.07092- 100 0.06635 0.002850 0.06920 110 0.06364 0.003762 0.06740 120 0.06060 0.004914 0.06551 130 0.05715 0.006351 0.06350 140 0.05319 0.008120 0.06131 150 0.04864 0.010295 . 0.05894 160 0.04340 0.012936 0.05634 170 0.03734 0.016108 0.05345 180 0.03035 0.019896 0.05025 190 0.02228 0.024400 0.04668 200 0.01300 0.029715 0.04272 210 0.00230 0.035938 0.03824 212 0.00000 0,037307 0.03731 0.02083 0.02039 0.01998 0.01958 0.01921 0.01885 0.01851 0.01819 0.01790 0.01762 0.01736 0.01714 0.01695 0.01679 0.01668 0.01662 0.01662 0.01668 0.01684 0.01710 0.01749 0.01802 0.01815 48.02 49.05 50.07 51.07 52.06 53.05 54.02 54.97 55.87 56.76 57.59 58.35 59.00 59.56 59.96 60.17 60.17 59.96 59.38 58.49 57.18 55.50 55.10 0.2413 0.2415 0.2418 0.2420 0.2426 0.2431 0.2439 0.2450 0:2465 0.2485 0.2509 0.2543 0.2587 0.2644 0.2721 0.2820 0.2950 0.3121 0.3351 0.3663 0.4094 0.4712 0.4865 aFrom Fan Engineering. constant. Any change in the pressure and volume of .a gas at constant temperature is called an isothermal change. Charles' Law refers to the relation between pressure; volume and tem perature of a gas and may be stated as follows: The volume of a given weight of.gas varies directly as the absolute temperature at constant pressure:, and the pressure varies directly as the absolute temperature at-constant volume. Hence, when heat is added at constant volume, Vc, the resulting 579