Final answer:
To calculate the rate of heat flow through the wall, consider the thermal resistance of each layer and apply the formula Q = (Ti - To) / R. When considering the 2-by-4 studs, account for the thermal resistance of the studs as well.
Step-by-step explanation:
To calculate the rate of heat flow through the wall, we need to consider the thermal resistance of each layer and apply the formula Q = (Ti - To) / R where Q is the rate of heat flow, Ti is the inside temperature, To is the outside temperature, and R is the thermal resistance.
In this case, we have three layers: drywall, fiberglass batts, and insulated siding. We can calculate the thermal resistance for each layer by dividing the thickness by the R factor. Then, we can sum up the thermal resistances and calculate the rate of heat flow.
To calculate the heat current when considering the 2-by-4 studs, we need to account for the thermal resistance of the studs as well. We can calculate the thermal resistance for each stud by dividing the length by the R factor. Then, we can adjust the total thermal resistance and calculate the heat current.