Document 240MVYRVOB1dLvwmOMN6QrNb

14 CHAPTER 2 1957 Guide Thermal conductance per unit area, Unit conductance: heat transferred per (unit time) (unit area) (degree).................................................................. ... C C - c_ 1 - 9 - * * A RA A(f, - Q L Thermal conductivity: heat transferred per (unit time) (unit area) (degree per unit length)........................................................................................... .................. k _9 A k = (h - ti) L Surface coefficient of heat transfer, Film coefficient of heat transfer. Individual coefficient of heat transfer: heat transferred per (unit time) (unit area) (degree)......................................................................................................................f g A / = t,-tt (In general / is not equal to k/L, where L is the actual thickness of the fluid film.) Overall coefficient of heat transfer, Thermal transmittance per unit area: heat transferred per (unit time) (unit area) (degree overall).....................................V A U= U -- fi Thermal transmission (heat transferred per unit time).............. .............................. q Q 9=7 Thermal resistance (degree per unit of heat transferred per unit time)................. R Thermal resistivity.......................................................................................................1/4 Vaporization values at constant pressure. Differences between values for satu rated vapor and saturated liquid at the same pressure....................Svbscript fg Velocity................................................................................................................... V Viscosity, absolute...................................................... M Viscosity, kinematic.....................................................................................................u/p 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 Weight of a major item. Total weight......................... ..............................................W Weight rate, Weight per unit of power, Weight per unit of time............................. w Work (total)............................. .....................................................................................IV THE GREEK ALPHABET Act Alpha B0 Beta r 7 Gamma A 6 Delta E e Epsilon Zf Zeta H,, Eta e&e Theta I t Iota K k Kappa A X Lambda M ja Mu NrNu Z{ Xi 0 o Omicron n w Pi P p Rho 2 a s Sigma T r Tau T u Upsilon 4> <p g> Phi X x Chi 'J' Psi 1 to Omega Abbreviations, Symbols, Conversion Factors '- CONVERSION EQUATIONS6 Heat, Power and Work 1 ton refrigeration , Latent heat of ice 1 Btu l.Int. watthour 1 Int. kilowatthour / 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 X Int. kilowatt (1000 watts) lTrI'iriCal?ri?s}' A l.l. Kilocalorie/ 1 horsepower 1 boiler horsepower Weight and Volume 1 gal (U. S.) 1 British or Imperial gallon 1 cu ft 1 J eu ft water at 60 F cu ft water at 212 F (in vacuo) i eat water at 60 F 1 gal water at 212 F r (" ") 1 lb (avdp) X bushel 1 short ton Pressure 1.341 hp = 56.88 Btu per minute , 44,267 ft-lb per minute 3.968 Btu 3088 ft-lb 1.1628 Int. whr oou rt-lb per second cu in. / 7.481 gal ( 1728 cu in. = 62.37 lb = 59.83 lb = 8.338 lb = 7.998 lb 16 oz 7000 grains = 1.244 cu ft = 20001b lb per square inch 1 02 per square inch 2.0360 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 -{ ? v^6-in' mercury at 62 F r in. water at 62 F