The formula for the heat transfer coefficient for a single layer is 1/U=x/k+1/hi+1/ho
My question is, how is this equation modified for the same single layer, with an added layer of insulation, ho will change in value, but is there just another x/k added in for the second layer?
Also is it...
The formula Q=U*A*(Tf-Ti) gives the total rate of heat transfer.
Q may be replaced with phi in some formulas
The units for U(heat transfer coefficient) are W/(m^2K)
and Tf/Ti are K
and for A they are m^2
crossing the units gives the units of Q to be Watts(W)
Why is it a rate of heat...
