- #1

tquiva

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## Homework Statement

The ceiling of a room has an area of 135ft^2. The ceiling is insulated to an R value of 30 (in units of ft^2*deg. F*h/Btu). The surface in the room is maintained at 63 deg. F, and the surface in the attic has a temperature of 38 deg. F. What is the heat flow through the ceiling into the attic in 4.5 h?

Express your answer in (a) BTU and (b) joules.

## Homework Equations

The equation I used was the heat current equation with thermal resistance.

H = [A(Th-Tc)] / R

## The Attempt at a Solution

The equation I used was the heat current equation with thermal resistance.

H = [A(Th-Tc)] / R

= [(135ft^2)(63 deg. F - 38 deg. F)] / [30 ft^2*deg. F*h/BTU]

= [(135)(25)] / [30]

= 3.8 BTH / h

I've already made an attempt to this problems and my results don't seem to not be right. Can someone please help me?