A wood slab with a thickness of 0.05 m is subjected to a heat flux of 40?W/m2. The left and right surface temperatures of the wood slab are kept at constant temperatures of 40°?C and 20°?C, respectively. What is the thermal conductivity of the wood slab?
What will be an ideal response?
The thermal conductivity of a wood slab subjected to a given heat flux of 40 W/m2 with constant left and right surface temperatures of 40ºC and 20ºC is to be determined.
Assumptions 1 Steady operating conditions exist since the surface temperatures of the wood slab remain constant at the specified values. 2 Heat transfer through the wood slab is one dimensional since the thickness of the slab is small relative to other dimensions. 3 Thermal conductivity of the wood slab is constant.
Analysis The thermal conductivity of the wood slab is determined directly from Fourier’s relation to be
Discussion Note that the ºC or K temperature units may be used interchangeably when evaluating a temperature difference.
You might also like to view...
Explain why masonry is frequently used in passive solar design.
What will be an ideal response?
The effect of early 19th-century industrialization on the trans-Allegheny West was to encourage
A. specialized, cash-crop agriculture. B. slavery in the trans-Allegheny West. C. self-sufficient farming. D. farmers to abandon agriculture and sell their land to move to cities for better economic opportunities. E. higher tariffs.
Which of the following is not one of the basic principles of human behavior?
A) Always treat someone the way you think they want to be treated B) Respect the differences in people C) People want, first and foremost, to be understood D) All of the above
Awareness in marketing means that the target market will know ________.
A) Name of your company B) Company location C) General idea of what you do D) All of these