Document 2qrgV2eY0ZMZbnLGydemKbZQa

s 14 CHAPTER 2 1949 Guide Thermal conductance per unit area, Unit conductance: heat transferred per' (unit time) (unit area) (degree)...............................................................................C c = = -- 9 -k * A RA = A(h - tO " L Thermal conductivity: heat transferred per (unit time) (unit area) (degree per unit length).............................................. ..................................................................k Jfc =-~A-(h tz) L Surface coefficient of heat transfer, Film coefficient of heat transfer. Individual. coefficient of heat transfer: heat transferred per (unit time) (unit area) (degree).......................................................................................................................... / jf A ti -- li (In general / is not equal to k/L, where L is the actual thickness of the fluid film.) Over-all coefficient of heat transfer, Thermal transmittance per unit area: heat transferred per (unit time) (unit area) (degree over-all).................................. XJ 1 Thermal transmission (heat transferred per unit time).......................... Q ?=7 Thermal resistance (degree per unit of heat transferred per unit time) ? R L_ R= kA Thermal resistivity....'..................................... ...............................................Ilk Vaporization values at constant pressure. Differences between values for satu- , rated vapor and saturated liquid at the same pressure......... ....... . .Subscript r Velocity................... .................................................................................. ...........................V ^ Viscosity, absolute...................................................................................................... -' M . Viscosity, kinematic............................................................................ ' ...................... m/p Volume (total)...................... 1...................-................................... ....................................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 Weight of a major item. Total weight.............................. .................... .......... ,.. W Weight rate, Weight per unit of power, Weight per unit of time.............. '.............. w Work (total).................................................................................,. ........................... /.... W THE GREEK ALPHABET -A a Alpha B (3 Beta T y Gamma A 5 Delta E Epsilon Z f . Zeta ,Ht| Eta 0 d 0 Theta 11 Iota ' K k Kappa ' A X Lamdba Mm Mu N v Nu si xi 0 o Omicron Ur Pi P p Rho 2<rr Sigma Tt Tau T u Upsilon Phi Xx Chi rj/ Psi flu Omega Abbreviations and Symbols CONVERSION EQUATIONS5 Heat, Power and Work 1 ton refrigeration Latent heat of ice 1 Btu 1 Int. watthour 1 Int. kilowatthour { 12,000 Btu per hour Btu per minute 143.4 Btu per pound ( 778.3 ft-ib { 0.2930 Int. whr l 252.0 I.T. calorie 2656 ft-lb 3.413 Btu 3600 Int. joules 360 I.T. calories 1 Int. kilowatt (1000 watts) 1000 I.T. calories \ 1 I.T. Kilocalorie j 1 horsepower 1 boiler horsepower Weight and Volume 1 gal (U. S.) 1 British or Imperial gallon I cu ft 1 1 1 cu ft water at 60 F cu ft water at 212 F gal water at 60 F (in f" vacuo " ) ) 1 gal water at 212 F ( " " ) I lb .(avdp) 1 bushel 1 short ton Pressure f 1.341 hp > ! 56.88 Btu per minute l 44,267 ft-lb per minute- f 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 650 ft-lb per second -{ 33,475 Btu per hour 9.809 Int. kw / 231 cu in. 1 0.1337 cu ft 277.42 cu in. / 7.481 gal \ 172? cu in. 62.37 lb 59.83 lb 8.338 lb 7.998 lb / 16 oz \ 7000 grains 1.244 cu ft 2000 lb 1 lb per square inch 1 oz per square inch "8 is.iaiou in. mercury at 32 F 2.0422 in. mercury at 62 F 2.309 ft water at 62 F 27.71 in. water at 62 F { 0.1276 in. mercury at 62 F . .1.732 in. water at 62 F 15