Page 345 - Valve Selection Handbook

Appendix D: International System of Units (SI) 315

Thermal Conductivity
(Heat x Length/Area x Time x Degree Temperature)
2
2
Btu in/ft h°F kcal in/ft h °C W/m°C kcal/m h°C Btu/ft h°F cat/cm s°C
1 0.4536 0.1442 0.1240 0.0833 3.445 x 10- 4
2.2046 1 0.3180 0.2734 0.1837 7.594 x 10- 4
6.933 3.146 1 0.8598 0.5778 2.388 x 10~ 3
3
8.064 3.658 1.163 1 0.6720 2.778 x 10-
12 5.443 1.731 1.488 1 4.134X10' 3
2903 1317 418.7 360 241.9 1
7 Btu in/tfh'F = 1 Chu in/f?h°C
0
1 Btu/ft h°F = 1 Btuft/fi?h F = 1 Chu/ft h°C
2
2
1 W/m°C = 10 W/cm°C = 1 kWmm/m °C

Specific Heat Capacity (Heat/Mass x Degree Temperature)

ftlbf/lb°F kgfm/kg°C kJ/kg°C *Bhj/lb°F kcal/kg°C
1 0.5486 5.380 xlO' 3 1.285X10- 3 1.285 x 10- 3
1.823 1 9.807 x 10- 3 2.342 x 10~ 3 2.342 x 10- 3
185.9 101.97 1 0.2388 0.2388
778.2 426.9 4.1868 1 1
778.2 426.9 4.1868 1 1
*; Btu/lb°F = / Chu/lb°C

Specific Energy
(Heat/Mass; e.g.. Calorific Value, Mass Basis, Specific Latent Heat)
ftlbf/lb kgfm/kg *kJ/kg Blu/lb kcal/kg MJ/kg
1 0.3048 2.989 x 10~ 3 1.285 xlO- 3 7. 139 xlO" 4 2.989 x 10- 6

3.281 1 9.807 x 10~ 3 4.216 xlO- 3 2.342 x 10~ 3 9.807 x 10- 6
334.55 101.97 1 0.4299 0.2388 io- 3
778.2 237.19 2.326 1 0.5556 2.326 x 10~ 3
3
1400.7 426.9 4.187 1.8 1 4. 187 xlO-
334553 101972 1000 429.9 238.8 1
*plJ/g = lkJ/kg
1 kcal/kg = 1 Chu/lb