Document e1vGkBGY7pJKmyD8rxajZ0ka4

14 CHAPTER 2 1956 Guide 1!| Thermal conductance per unit'area, Unit conductance: heat transferred per (unit time) (unit area) (degree)....................................................... . --.......... C r 1 _ q -,k ' A RA A((i -- (*) L Thermal conductivity: heat transferred per (unit time) (unit areaj (degree per unit length)............. ................................. ..... ....................................................^ `-sis L Surface coefficient of heat transfer, Film coefficient of heat transfer, Individual coefficient of heat transfer: heat transferred per (unit time) (unit area) (degree)..................................................................................................................... / g A /= U-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).................................... U '9 Thermal transmission (heat transferred per unit time).................... Q T * Thermal resistance (degree per unit of heat transferred per unit time) 9 R -- ** ~ k ^ q kA Thermal resistivity............. .................. ........ ... j......... .............. .............. V* Vaporization values at constant pressure, DifferericesTbetween values for satu rated vapor and saturated liquid at the same pressure....................Subscript fg Velocity...................... .................................................. .............................................. V Viscosity, absolute........ ................... .............................................. ............... -- m Viscosity, kinematic__ ..................................................................... ........... .p/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..'. Weight of a major item, Total weight......................... ......... ....................... ....... Weight rate, Weight per unit of power, Weight per unit of time.............. ............ Work (total).............................. ;............................................................................. THE GREEK ALPHABET A a Alpha B/3 Beta r-r Gamma A S Delta E< Epsilon Zf Zeta H, Eta e&e Theta I i Iota K k Kappa A X Lambda M ii Mu N v Nu EJ Xi O o Omicron Hit Pi P p Rho 2 a i Sigma T t Tau T u Upsilon $ <p <f> Phi X X Chi 9.#. Psi . Qa> Omega . Abbreviations, Symbols, Conversion Factors 15 CONVERSION EQUATIONS5 Heat, Power and Work 1 ton refrigeration Latent heat of ice 1 Btu 1 Int. watthour 1 Int. kilowatthour 1 Int. kilowatt (1000 watts) 1000 I.T. calories! 1 I.T. Kilocalorie/ f 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 f 3,413 Btu | 3.517 lb water evaporated from { and at 212 F 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