An exterior wall is made up of 4" of Precast Concrete of Conductivity (K) 1.0 BTU/ in. Hr. sf ºF, a 2" Air Space of Resistance (R) 1.13, Concrete Block of Transmittance (U) 0.901 BTU/ Hr. sf. ºF, 2" of Insulation of Resistance (R) 15.0 and 1/2” of Gwb of Resistance (R) 0.32. The Resistance (R) of the Outside Air Film is 0.17 and the Resistance (R) of the Inside Air Film is 0.68. Area of the wall is1,000 SF. The outside Temperature is 32ºF. The inside Temperature is 72ºF and inside Relative Humidity is 30%. What is the Temperature drop in ºF across the insulation? The temperature at the interior side (warm side) - the temperature at the exterior (cold side) =?

An exterior wall is made up of 4" of Precast Concrete of Conductivity (K) 1.0 BTU/ in. Hr. sf ºF, a 2" Air Space of Resistance (R) 1.13, Concrete Block of Transmittance (U) 0.901 BTU/ Hr. sf. ºF, 2" of Insulation of Resistance (R) 15.0 and 1/2” of Gwb of Resistance (R) 0.32. The Resistance (R) of the Outside Air Film is 0.17 and the Resistance (R) of the Inside Air Film is 0.68. Area of the wall is1,000 SF. The outside Temperature is 32ºF. The inside Temperature is 72ºF and inside Relative Humidity is 30%. What is the Temperature drop in ºF across the insulation? The temperature at the interior side (warm side) - the temperature at the exterior (cold side) =?