Part $1$: Composite Wall

A composite wall is made of pressed board, insulation, and gypsum. This wall represents a

ceiling overhead for a small storage building with joists that measure $($cross sectionally$)$ as

$40mm130mm$ : The joists are spaced $0\mathrm{.}65$ m between centers. The boards are $8$ mm thick. The

Gypsum is $12$ mm thick.

Ins:

We have three options for insulation:

a$)$ Fiberglass

b$)$ Blown in Cellulose

c$)$ Sprayed in Polyurethane

Problems

A$)$ Do some research and pick the best insulation to use for our ceiling design. Make sure

to reference and defend your answer.

B$)$ Using Table A$-3(T$~~$300K$ and the thermal conductivity value you found in your

research calculate the ceilings overall thermal resistance.

C$)$ Calculate the heat flux $(\frac{W}{m^2})$ for our ceiling design.

D$)$ If the attic temperature is $115F$ and the inside temperature was $75F,$ what would the

heat rate from the ceiling be for a $100$ sqft storage building with this ceiling? Assume that

$h=10\frac{W}{m^2(K)}$ for the attic and interior.