5-12 - 298 Finite Element Analysis and Design 12. Consider...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
298 Finite Element Analysis and Design 12. Consider a wall built up of concrete and thermal insulation. The outdoor temperature is T o = 17 C and the temperature inside is T i = 20 C. The wall is subdivided into three elements. The thermal conductivity for concrete is k c = 1.7 W/m/ o C, and that of the insulator is k i = 0.04 W/m/ o C. Convection heat transfer occurs at both surfaces with convection coefficients of h 0 = 14 W/m 2 / o C and h i = 5.5 W/m 2 / o C. Calculate the temperature distribution in the wall. Also, calculate the amount of heat flow through the outdoor surface. Solution: Assuming that the wall is wide enough, we model the problem unit area of the wall, i.e., A= 1 m 2 . The element matrix equations become Element 1: (1) 11 2 2 24.286 24.286 24.286 24.286 Tq T q         Element 2: (2) 22 (2) 3 3 0.4 0.4 0.4 0.4 T q  
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

5-12 - 298 Finite Element Analysis and Design 12. Consider...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online