Technical Characteristics, Heat Transfer, Energy, IME,

 

Heat Transfer Coefficients

  Unit of heat pound centigrade or centigrade heat unit is the heat required to raise one pound of water 1 C. degree and equals 1.8 Btu.

1 Btu/hr./sq.ft./F. = 4.88 kg-ca./hr./sq.m./C.

1 kg-cal./hr./sq.m./C.=. 205 Btu/hr./sq.ft./F.

Heat Coefficients

1 Btu = 252 calories

1 kilocalorie = 1000 calories

1 Btu/lb. =. 555 kcal/kg

1 kcal / kg = 1.8 Btu/lb.

Energy Coversion Equivalents

1 Btu = 778 ft. lbs.

1 Horsepower

= 33,000 ft.lb./min.

= 550 ft.lb/sec.

= 746 watts

= 2545.6 Btu / hr.

= 42.42 Btu/ min.

1 Horsepower hour

= 1 horsepower for 1 hr.

= 1,980,000 ft.lb.

= 746 kilowatt hours

= 2545.6 Btu

1 kilowatt

= 1,000 watts

= 1.34 horsepower

1 kilowatt hour

= 1 kilowatt for 1 hr.

= 1,000 watt hours

Ice Melting Effect (ime)

1 ton of Refrigeration 

= 288,000 Btu/day

= 12,000 Btu/hr.

= 200 Btu/min.

= 83.3 lbs. of ice/ hr.

Energy

1 dyne cm 

= 1 erg

=. 001 g. cm

= 7.38×10.8 ft.lb.

1 g.cm

= 980.6 ergs

= 7.233 × 10.5 ft. lb.

1 ft. lb.

= 13,557,300 ergs

= 13,825.5 g.cm

1 therm 

= 100,000 Btu

Rate of Energy

1 erg/sec.

= 1 dyne cm

= 7.38 × 10.8 ft. lb./sec.

1 gram.cm

= 980.6 ergs/sec. 

= 7.24 × 10.5 ft. lb./sec.

1 ft.lb./sec.

= 13,557,300 ergs/sec.

= 13,800 grams cm/sec.