Document ZBaB9qNeEDY63Ve2Enp6p79VV

HEATING VENTILATING AIR CONDITIONING GUIDE 1943 Thermal transmission (heat transferred per unit time) Thermal resistance (degrees per unit of heat transferred per unit time). R = ti --_ti ~ L ~kA Thermal resistivity.. ____________ 1/k Vaporization values at constant pressure, Differences between values for saturated vapor and saturated liquid at the same pressure:Subscript f* Velocity-_________________ __________ ____ _________ ________ _y Volume (total)______________________;___________ __________________ _v Volume per unit time. Rate at which quantity of material passes through a machine, Quantity of heat per unit time, Quantity of heat per unit weight--;__ ...q Watt__.:____ ;.............................................. L______ ________________;w Watthour______________________ ____________ ______ ____________ ; Weight of a major item, Total weight................... ...'........................ Weight rate, Weight per unit of power, Weight per unit of time.. ___ _________ __ whr W Work (total)........................................................................................ .W CONVERSION EQUATIONS Heat, Power and Work .1 tori refrigeration Latent heat of ice 1 Btu 1 watthour 1 kilowatthour 1 kilowatt (1000 watts) 1000 mean calorie 1 1 kilogram calorie / 1 horsepower 1 boiler horsepower Weight and Volume / 12,000 Btu per hour \ 200 Btu per minute 143.4 Btu per pound 778.26 ft-lb 0.293 whr 252 mean calories 2,655 ft-lb 3.413 Btu 3600 joules 860 mean calories 3,413 Btu 3.517 lb water evaporated from and at 212 F 1.341 hp 56.88 Btu per minute 44,253 ft-lb per minute 3.969 Btu 3087 ft-lb 1.1627 whr 0.746 kw 42.42 Btu per minute 33,000 ft-lb per minute 550 ft-lb per second ( 33,475 Btu per hour L 9.808 kw 1 gal (U. S.) 1 British or Imperial gallon 1 cu ft 1 cu ft water at 60 F 1 cu ft water at 212 F 1 gal water-at 60 F 1 gal water at. 212 F 1 lb (avdp) 1 bushel1 short ton _ / 231 cu in. - \ 0.1337 cu ft = 277.42 cu in. = ./ 7.48 gal \ 1728 cu in. = 62.37 lb = 59.83 lb = 8.34 lb = 7.998 lb / 16 oz \ 7000 grains = 1.244 cu ft = -2000 lb . . 854 CHAPTER 48.: ABBREVIATIONS, SYMBOLS, STANDARDS Pressure 1 lb per square inch f 144 lb per square foot _ I 2.0421 in. mercury at 62 F | 2.309 ft water at 62 F ( 27.71 in. water at 62 F l.oz per square inch 1 atmosphere -{ 0.1276 in. mercury at 62 F 1.732 in. water at 62 F 14.6959 lb per square inch 2117 lb per square foot 33.9 ft water at 62 F 30 in. mercury at 62 F 29.921 in. mercury at 32 F l.in. water at 62 F 1 ft water at 62 F 1 in. mercury at 62 F 0.03609 lb per square inch 0.5774 oz per square inch 5.196 lb pet square foot -{ 0.433 lb per square inch 62.35 lb per square foot 0.491 lb per square inch 7.84 oz per square inch 1.131 ft water at 62 F 13.58 in. water at 62 F Metric Units 1 cm .1 in. ' In ,- " 1 ft 1 sq cm 1 sq in/ 1 sq m 1 sq ft 1 cu cm 1 cu in. 1 cu m. 1 cu ft 1 liter 1 kg 1 lb 1 metric ton 1 gram : ' ' 1 kilometer per hour - 1 gram per square centimeter = 0.3937 in. = 2.540 cm = 3.281 ft = 0.3048 m = 0.155 sq in. = 6.452 sq cm = 10.76 sq ft = 0.0929 sq m = 0.06102 cu in. = 16.39 cu cm = 35.31 cu ft = 0.02831 cu m = 1000 cu cm = 0.2642 gal = 2.205 lb (avdp) = 0.4536 kg = 2205 lb (avdp) = 0.002205 lb (avdp) = 0.6214 mph 0.02905 in. mercury at 62 F 0.3944 in. water at 62 F . 1 kg per sq cm (metric atmosphere) 1 gram per cubic centimeter 1 dyne 1 joule ., 1 metric horsepower _ . = 14.22 lb per square inch _ / 0.03613 lb per cubic inch \ 62.43 lb per cubic foot = 0.00007233 poundals (10,000,000 ergs , - \ 0.7376 ft-lb / 75 kg-m per second - \ 0.986 hp (U. S.) 1 kilogram-calorie per kilogram =1.8 Btu per pound 1 gram-calorie per square centimeter = 3.687 Btu per square foot 1 gram-calorie per square centimeter per centimeter = 1.452 Btu per sq ft per inch 1 gram-calorie per second per -square centimeter ( 2903 Btu per hour per square For a" temperature gradient of 1 deg C per centi- = I foot for a temperature gradient meter. - - ( of 1 deg F per inch of thickness. 855