Factores de conversión - Facultad de Ingeniería Mecánica

Factores de conversi?n

Dr. Carlos Rubio Maya

Facultad de Ingenier?a Mec?nica, U.M.S.N.H.

Septiembre 2011

DIMENSION Aceleraci?n Area Densidad Energ?a

Fuerza Flujo de calor Coeciente de transferencia de calor Longitud

Masa

Potencia

Presi?n

METRICO

1 m/s2 = 100 cm/s2

1 m2 = 104 cm2 = 106 mm2 = 10-6 km2

1 g/cm3 = 1 kg/L = 1000 kg/m3

1 kJ = 1000 J = 1000 N ? m = 1 kP a ? m3 1 kJ/kg = 1000 m2/s2 1 kW h = 3600 kJ 1 cal = 4.184 J 1 IT cal = 4.1868 J 1 Cal = 4.1868 kJ

1 N = 1 kg ? m/s2 = 105 dina 1 kgf = 9.80665 N 1 W/cm2 = 104 W/m2

1 W/m2 ? C = 1 W/m2 ? K 1 m = 100 cm = 1000 mm = 106 ?m 1 km = 1000 m

1 kg = 1000 g 1 ton metrica = 1000 kg

1 W = 1 J/s 1 kW = 1000 W = 1.341 hp 1 hp = 745.7 kW

1 P a = 1 N/m2 1 kP a = 103 P a = 10-3 M P a 1 atm = 101.325 kP a = 1.01325 bars = 760 mm Hg (0C) = 760 torr = 1.03323 kgf /cm2 = 10.3323 m c.a. 1 mm Hg = 0.1333 kP a

METRICO/INGLES

1 m/s2 = 3.2808 f t/s2 1 f t/s2 = 0.3048 m/s2 1 m2 = 1550 in2 = 10.764 f t2 1 f t2 = 144 in2 = 0.09290304 m2 1 g/cm3 = 62.428 lbm/f t3 = 0.036127 lbm/in3 1 lbm/in3 = 1728 lbm/f t3 1 kg/m3 = 0.062428 lbm/f t3 1 kJ = 0.94782 Btu 1 Btu = 1.055056 kJ = 5.40395 psia ? f t3 = 778.169 lbf ? f t 1 Btu/lbm = 25, 037 f t2/s2 = 2.326 kJ/kg 1 kJ/kg = 0.430 Btu/lbm 1 kW h = 3412.14 Btu 1 termia = 105 Btu = 1.055x105 kJ (G.N.) 1 N = 0.22481 lbf 1 lbf = 32.174 lbm ? f t/s2 = 4.44822 N 1 W/m2 = 0.3171 Btu/h ? f t2

1 W/m2 ? C = 0.17612 Btu/h ? f t2 ? F 1 m = 39.370 in = 3.2808 f t = 1.0926 yd 1 f t = 12 in = 0.3048 m 1 milla = 5280 f t = 1.6093 km 1 in = 2.54 cm 1 kg = 2.2046226 lbm 1 lbm = 0.45359237 kg 1 onza = 28.3495 g 1 slug = 32.174 lbm = 14.5939 kg 1 ton corta = 2000 lbm = 907.1847 kg 1 kW = 3412.14 Btu/h = 737.56 lbf ? f t/s 1 hp = 550 lbf ? f t/s = 0.7068 Btu/s = 42.41 Btu/min = 2544.5 Btu/h = 0.74570 kW 1 hp caldera = 33, 475 Btu/h 1 Btu/h = 1.055056 kJ/h 1 ton de ref rigeracion = 200 Btu/min 1 P a = 1.4504x10-4 psia = 0.020886 lbf /f t2 1 psi = 144 lbf /f t2 = 6.894757 kP a 1 atm = 14.696 psia = 29.92 in Hg (30F ) 1 in Hg = 3.387 kP a

DIMENSION Calor espec?co

Volumen espec?co Temperatura

Conductividad t?rmica Velocidad

Volumen

Flujo volum?trico Viscosidad

METRICO

1 kJ/kg ? C = 1 kJ/kg ? K

1 m3/kg = 1000 L/kg = 1000 cm3/g T (K) = T (C) + 273.15 T (K) = T (C)

1 W/m ? C = 1 W/m ? K 1 m/s = 3.60 km/h

1 m3 = 1000 L = 106 cm3

1 m3/s = 60, 000 L/min = 106 cm3/s 1 P oise(P ) = 1 g/cm ? s = 0.1 kg/m ? s 1 P a ? s = 1 kg/m ? s

METRICO/INGLES

1 Btu/lbm ? F = 4.168 kJ/kg ? C 1 Btu/lbmol ? R = 4.1868 kJ/kmol ? K 1 kJ/kg ? C = 0.23885 Btu/lbm ? F = 0.23885 Btu/lbm ? R 1 m3/kg = 16.02 f t3/lbm 1 f t3/lbm = 0.062428 m3/kg T (R) = T (F ) + 459.67 = 1.8T (K) T (F ) = 1.8 T (C) + 32 T (F ) = T (R) = 1.8 T (K)

1 W/m ? C = 0.57782 Btu/h ? f t ? F 1 m/s = 3.2808 f t/s = 2.237 mi/h 1 mi/h = 1.46667 f t/s 1 mi/h = 1.6093 km/h 1 m3 = 6.1024x104 in3 = 35.315 f t3 = 264.17 gal(U S) 1 U S galon = 231 in3 = 3.7854 L 1 f l onza = 29.5735 cm3 = 0.0295735 L 1 U S galon = 120 f l onzas

1 m3/s = 15, 850 gal/min (gpm) = 35.315 f t3/s = 2118.9 f t3/min (cf m) 1 slug/f t ? s = 47.88 kg/m ? s 1 lbm/f t ? s = 0.031081 lbf ? s/f t2

Constantes f?sicas

Constante universal de los gases

Aceleraci?n de la gravedad est?ndar Presi?n atmosf?rica est?ndar

Constante de Stefan-Boltzmann Constante de Boltzmann Velocidad de la luz en el vac?o Velocidad del sonido en aire seco (0oC y 1 atm) Calor de fusi?n del agua (1 atm) Entalp?a de vaporizaci?n del agua (1 atm)

Ru = 8.31447 kJ/kmol ? K = 8.31447 kP a ? m3/kmol ? K = 0.0831447 bar ? m3/kmol ? K

= 82.05 L ? atm/kmol ? K

= 1.9858 Btu/lbmol ? R

= 1545.37 f t ? lbf /lbmol ? R = 10.73 psia ? f t3/lbmol ? R g = 9.80665 m/s2 = 32.174 f t/s2

1 atm = 101.325 kP a

= 1.01325 bar

= 14.696 psia = 760 mm Hg (0C) = 29.9213 in Hg (32F ) = 10.3323 m H2O (4C) = 5.6704x10-8 W/m2 ? K4 = 0.1714x10-8 Btu/h ? f t2 ? R4 k = 1.380650x10-23 J/K co = 2.9979x108 m/s = 9.836x108 f t/s

c = 331.6 m/s

= 1089 f t/s

hif = 333.7 kJ/kg = 143.5 Btu/lbm

hfg = 2256.5 kJ/kg = 970.12 Btu/lbm

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