Document pBabYzYD90QV25g7aaBXdaDyd

798 ________________ Chapter 48 . 1945 Guide ' '' I" . Thermal resistance (degree per unit of heat transferred per unit time)...... .................... R Thermal resistivity___ _______________ -._____________ .......................... ............................ 1/k Vaporization values at constant pressure. Differences between values for saturated vapor and saturated liquid at the same pressure__ ________ __________ Subscript fE Velocity;___________ ___________ ______________________ :V Volume (total)._____________________ :t1..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_____ Weight of a major item. Total weight..............................................:...i________ ; Weight rate, Weight per unit of power, Weight per unit of time.... :................................ Work (total)............................,.............................:................................................1_____......... CONVERSION EQUATIONS5 Heat Power and Work 1 ton refrigeration Latent heat of ice 1 Btu 1 Inf. watthour 1 Int. kilowatthour 1 Int. kilowatt (1000 watts) 1000 I.T. calories \ 1 I.T. Kilocalorie / 1 horsepower 1 boiler horsepower _ / 12,000 Btu per hour \ 200 Btu per minute = 143.4 Btu per pound 778.3 ft-lb 0.2930 Int. whr 252.0 I.T. calorie 2656 ft-lb 3.413 Btu 3600 Int. joules 860 I.T. calories 3.413 Btu 3.517 lb water evaporated from and at 212 F 1.341 hp 56.88 Btu per minute 44,267 ft-lb per minute 3.968 Btu 3088 ft-lb 1.1628 Int. whr 0.7455 Int. kw 42.40 Btu per minute 33,000 ft-lb per minute 550 ft-lb per second / 33,475 Btu per hour \ 9.809 Int. kw Weight and Volume. 1 gal (U. S.) 1 British or Imperial gallon - 1 cu ft 1 cu ft water at 60 F (in vacuo.) 1 cu ft water at 212 F ( " " ) 1 gal water at 60 F ( " " ). 1 gal water at 212 F ( " `` ) 1 lb (avdp) 1 bushel 1 short ton / 231 cu in. \ 0.1337 cu ft = 277.42 cu in. _ / 7.481 gal " \ 1728 cu in. = 62.37 lb = 59.831b = 8.338 lb = 7.998 lb ! 16 oz l 7000 grains = 1.244 cu ft = 20001b . *Checked in 1944 by National Bureau of Standards. Abbreviations Int. and I.T. refer to International and International {Steam)' Table respectively. is3 Abbreviations, Symbols, Standards 799 Pressure 1 lb per square inch 1 oz per square inch . 1 atmosphere 1 in. water at 62 F (in vacuo) 1 ft water at.62 F (in vacuo) 1 in. mercury at 62 F (in vacuo) . Metric Units (144 lb per square foot 2.0422 in. mercury at 62 F 2.309 ft water at 62 F 27.71 in. water at 62 F / 0.1276 iri. mercury at 62 F - \ 1.732 in. water at 62 F 14.696 lb per square inch 2116 lb per square foot 33;94 ft water at 62 F 30.01 in. mercury at 62 F 29.921 in. mercury at 32 F { 0.03609 lb per square inch 0.5774 oz per square inch 5.197 lb per square foot -{ 0.4330 lb per. square inch 62.37 lb per sguare foot 0.4897 lb per square inch 7.835 oz per square inch 1.131 ft water at 62 F 13.57 in. water at 62 F 1 cm 1 in. l.m. 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 lib 1 metric ton 1 gram 1 kilometer per hour 1 gram per square centimeter 1 kg per sq cm (metric atmosphere) 1 gram per cubic centimeter 1 dyne 1 absolute joule 1 Int. joule 1 metric horsepower 1 I. T. kilocalorie per kilogram = 0.3937 in. = 2.540 cm = 3.281 ft = 0.3048 m = 0:1550 sq in. = 6.452 sq cm = 10.76 sq ft , = 0.09290 sq m = 0.06102 cu in. ! = 16:39 cu cm = 35.31 cu ft = 0.02832 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 l 0.3942 in. water at 62 F = 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 = 0.7378 ft-lb _ / 75 kg-m per second " \ 0.986 hp (U. S.) = 1.8 Btu per pound 1 I.T. calorie per square centimeter = 3.687 Btu per square foot 1 I.T. calorie per second per square centimeter f 2903 Btu per hour per square tor a temperature gradient of 1 deg C per centi- - { foot for a temperature gradient meter I of 1 deg F per inch of thickness.