Thermal resistance is opposition to _______________________________________________________."
"Low thermal resistance allows _______________________________________________________."
High thermal resistance results in _______________________________________________________."
What is the formula for thermal resistance.
Re-arrange to solve for all variables.
What are the SI and English units of thermal resistance?
Think
Thermal conductivity
What is the formula relating thermal resistance to thermal conductivity?
Re-arrange to solve for all variables.
R-factor
Insulator
Molecular vibration
Re-work "Example 4-I" (pg. 97) using the following values: "The temperature inside a house is 68 deg. F when the outside temperature is -11 deg. F. A furnace supplies 2437 BTU/hr to maintain the inside temperature at 68 deg. F." Show all formulas, steps, and work.
Re-work "Example 4-J" (pg. 101) using the following values: A=6 ft2; l = .25"; and T=40F deg. Show all formulas, steps, and work.