FACTORES DE CONVERSIÓN

Factores de Conversión de Unidades
Fenómenos de Transporte
VOLUMEN
1 litro =1000 cm 3 = 61,03 in3
3
3
1 m = 1000 l = 35,315 ft =264,172 gal =0,028317
3
m
1 ft3 = 28,317 l = 7,481 gal americanos
1 gal. Americano = 3,78 litros
1gal imperial = 1,20094 gal americanos
1 barril = 42 gal. = 5,615 ft3 = 159 litros
1 plg3 = 16,387 cm3=28,317 lt = 0,028317 m 3
MASA
1 lbm = 453,59 g = 0,4539 Kg = 16 oz = 7000 granos
1 Kg = 1000 g = 2,2046 lbm
1 tonelada métrica = 1000 Kg = 2240 lbm
1 tonelada corta = 2000 lbm
FUERZA
1N = 1 Kgm/s2 = 0,22481 lbf = 105 dinas
1 Dina = 1 gcm/s2 =10-5 Kg m/s2 = 2,2481 x 10-6 lbf
1 lbf = 4,4482 N = 0,454 Kgf
1 Kgf = 9,81 N
POTENCIA
1 watt = 1 W = 1 J/s = 14,34 cal/min
1 KW = 239 cal/s = 737,5 ft-lbf/s = 56,87 BTU/min =
1,344 HP
1 hp = 42,4 BTU/min = 33.000 ft-lbf/min = 0,7457 KW
= 550 ft-lbf/s = 0,70BTU/s = 550 in-lbf/s = 745,7 W
1 caballo de vapor (c.V.) = 75 Kgfm/s = 0,736 KW
1 cavallo de caldera (B.H.P.) = 33,480 BTU/h = 9,803
KW
-4
1 BTU/h = 0,2931 W = 3,93(10 ) hp
-4
1 Kcal/h = 1,1622 W = 15,58 (10 ) hp
CONDUCTIVIDAD TÉRMICA
1 BTU/h.ft .ºF = 4,1365 x 10-4 cal/s.cm.ºC = 1,73073
W/m.K
COEFICIENTE DE TRANSFERENCIA DE CALOR
2
-4
2
1 BTU/h.ft .ºF = 1,3571x10 cal/s.cm .ºC = 5,6783 x
-4
2
2
10 W/cm .ºC = 5,6783 W/m .K
1 Kcal/h.m2.ºF = 0,2048 BTU/h.ft2.ºF
FLUJO ESPECIFICO DE CALOR
1 BTU. pie2 = 3,1546 W/m2 = 0,2937 W
-3
1 cal/h= 1,1622 x 10 W
LONGITUD
1m = 100 cm = 3,28 ft = 39,37 plg
1 plg = 2,540 cm
1 ft = 12 plg = 0,305 m = 30,5 cm
-6
--4
1 micra = 10 m = 10 cm = 1 m (micrómetro)
1 milla terrestre = 5280 ft = 1,609 Km
1 A (angstron) = 10-10 m = 10-4 m
1 milla náutica = 6080 ft 0 1,1516 millas terrestres
TEMPERATURA
T (K) = 273 + T(ºC)
T(ºF) = 1,8 ºC + 32
T(ºC) = (ºF –32) x 1/1,8
T(ºF) = T(ºC) /1,8
T(ºC) = 1,8 T(ºF)
T(K) = T(ºC)
PRESIÓN
2
2
1 atm = 760 mm Hg = 14,7 lbf/in = 1,033 Kgf/cm =
5
1,01 x 10 Pa = 1,01325 bar
1 atm = 33,93 ft de agua = 10 m de agua =
29,92 in de agua = 407 in de agua a 4ºC
1 Pa = 1 N/m2
1 bar = 0,9869 atm = 105 Pa = 14,5038 lbf/in2 =
750 mm Hg = 0,1 Mpa
1 lb/in2 = 1 lbf/in2 = 2,0360 in de Hg =
51,715 mm de Hg a 0ºC
1 lbf/ft2 = 6,89476 x 105dina/cm2 = 4,882 Kgf/m2 =
6894,7 N/m2
1 dina/cm2 = 2,0886 lbf/ft2
1 psi = 1 lbf/in2 = 730 Kgf/m2 = 144 lbf/ft2
CALOR, TRABAJO Y ENERGÍA
1 J = 1 Kg.m2/s2 = 1 N.m = 107 g.cm2/s2 (ergio)
1 BTU = 1055,06 J = 1,055 KJ = 252,16 cal
(termoquímica)
1 Kcal (termoquímica) = 1000 cal = 4,1840 J
1 cal (termoquímica) = 4,1840 J
1 cal (IT) = 4,1868 J
1 BTU = 251,996 cal (IT) = 778,17 ft.lbf
1 hp.hr = 0,7457 KW.h = 2544,5 BTU
1 ft.lbf = 1,35582 J
1 ft .lbf/lbm = 2,9890 J/kg
VISCOSIDAD
1 poise = 100 centipoise (cp) = 1g/cm.s
-2
-4
1 cp= 10 poise = 2,4191 lb/ft.h = 6,7197 x 10 lbm/ft.s =
-3
-3
-3
2
3,6 Kg/h.m = 10 Kg/m.s = 10 Pa.s = 10 N.s/m
2
1 Pa.s = 1 N.s/m = 1 Kg/m.s = 1000 cp
1 lb/ft.h = 0,4134 cp = 04134 x (10-3) Kg/m.s
1 stoke = 100 cp = 1 cm 2/s = 929 ft2/s
CAPACIDAD CALORIFICA Y ENTALPÍA
1BTU/lbm.ºF = 4,1868 KJ/Kg.K = 1.000 cal/g.ºC = 2326
J/Kg
1 ft lbf /lbm = 2,9890 J/Kg
1 cal/g.ºC = 4,1868 KJ/Kg.K
DIFUSIVIDAD
1 cm2/s = 3,875 pie2/h = 10-4 m2/s
1 m2/h = 10,764 pie2/h
2
4
2
1 m /s = 3,875 x 10 pie /h
-2
2
1 centistoke = 10 cm /s