Thermodynamics HW Solutions 609

Thermodynamics HW Solutions 609 - Chapter 7 External Forced...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 7 External Forced Convection 7-81 The thickness of flat R- 8 insulation in SI units is to be determined when the thermal conductivity of the material is known. Assumptions Thermal properties are constant. Properties The thermal conductivity of the insulating material is given to be k = 0.04 W/m °C. R-8 L Analysis The thickness of flat R- 8 insulation (in m 2 . ° C/W) is determined from the definition of R -value to be R L k LR k value value 2 m . C / W)(0.04 W / m. C) =→ = = ° ° = (8 0.32 m 7-82E The thickness of flat R- 20 insulation in English units is to be determined when the thermal
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online