Industry Directory 2016 | Page 189

AIRAH

189

Metric conversion
Flow Rate (mass)

1 lb/min
1 lb/hr

= 0.00756 kg/sec
= 0.00013 kg/sec

1 kg/s
1 kg/s

= 132 lb/min
= 7936 lb/hr

Flow Rate
(volume)

1 CFM
1 imp gpm
1 US gpm

= 0.472 L/s
= 0.076 L/s
= 0.0631L/s

1 L/s
1 L/s
1 L/s

= 2.12 CFM
= 13.2 imp gpm
= 15.8 US gpm

Enthalpy
Difference

1 BTU/lb

= 2.326 kJ/kg

1 kJ/kg

= 0.430 BTU/lb

Specific
Heat Capacity

1 BTU/lb °F

= 4.187 kJ/kg K

1 kJ/kg K

= 0.239 BTU/lb °F

Intensity of
Heat Flow Rate

1 BTU/hr ft²

= 3.155 W/m²

1 W/m²

= 0.317 BTU/hr ft²

Calorific
Value

1 BTU/lb
1 BTU/ft³

= 2.33 kJ/kg
= 37.3 kJ/m³

1 kJ/kg
1 kJ/m

= 0.430 BTU/lb
= 0.026 BTU/ft³

Moisture Content

1 grain/lb

= 0.143 gram/kg

1 gram/kg

= 7.0 grain/lb

Specific Volume

1 ft³/lb

= 0.0624 m³/kg

1 m³/kg

= 16.02 ft³/lb

Density

1 lb/ft³

= 16.02 kg/m³

1 kg/m³

= 0.0624 lb/ft³

Torque

1 lbf ft

= 1.356 Nm

1 Nm

= 0.7376 lbf ft

Energy

1 BTU
1 BTU
1 therm
1 Calorie

= 252 Calorie
= 1.06 kJ
= 106 MJ
= 4.187 J

1 cal
1 kJ
1 MJ
1 kWh

= 0.00396 BTU
= 0.948 BTU
= 0.00948 therm
= 3.6 MJ

Thermal
Resistance

1 ft².hr °F/BTU

= 176.1m²K/kW

1 m²K/kW

= 0.00568 ft². hr
°F/BTU

Fin
Spacing

  6 Fins/ inch
  8 Fins/ inch
10 Fins/ inch
12 Fins/ inch
14 Fins/ inch

=
=
=
=
=

4.23 mm
3.17 mm
2.54 mm
2.12 mm
1.81 mm

Fin pitch = 234 Fins / metre
Fin pitch = 314 Fins / metre
Fin pitch = 394 Fins / metre
Fin pitch = 472 Fins / metre
Fin pitch = 551 Fins / metre