Project Lead The Way!

[dez250]

OK well since I'm bored now i pulled my P.O.E. notebook out from this past school year and got out one of the homework sheets we have, this one being on thermodynamics. The following was the second of 8 questions, which get much harder as they go on, this is a simple single equations question, which my brother just went through in his junior year of college for mechanical engineering at Clarkson University in the class, Fundamentals of heat and mass transfer. The problem is copied as follows:

2.) A wall is made of an outer brick (R=0.3ft[^2]*hr*[degree]F/BTU), a piece of plywood (R=1), 6” of insulation (R=25), an air gap (R=4), and drywall (R=0.5).
Calculate the coefficient of thermal conductivity.

now i am wondering if anyone that says that P.L.T.W. is not worth the time, can answer that question on their own without looking to the web for help.

~Mike

P.S.--> Also this problem is expected to be done in a time frame of 3-5 minuets at max.