ME 414-514 HVAC Systems Topic 08 Cooling Loads

Wall and Roof Construction Type Codes for Transfer Function and CLTD Methods

Roof Types Roof No. Description Code number of layers

1 steel sheet w/ 1" insulation A0 E2 E3 B5 A3 E0 2 1" wood w/ 1" insulation A0 E2 E3 B5 B7 E0 3 4 inches l.w. concrete A0 E2 E3 C14 E0 4 2" h.w. concrete w/ 1" insulation A0 E2 E3 B2 C12 E0 5 1" wood w/ 2 " insulation A0 E2 E3 B6 B7 E0 6 6" l.w. concrete A0 E2 E3 C15 E0 7 2.5" wood w/ 1" insulation A0 E2 E3 B5 B8 E0 8 8" l.w. concrete A0 E2 E3 C7 E0 9 4" h.w. concrete w/ 1" insulation A0 E2 E3 B5 C5 E0

10 2.5" wood w/ 2" insulation A0 E2 E3 B3 B8 E0 11 roof terrace system A0 E2 E3 B6 E2 E3 C5 E0 12 6" h.w. concrete w/ 2" insulation A0 E2 E3 B6 C13 E0 13 4" wood w/ 1" insulation A0 E2 E3 B2 B9 E0

Note: the column that is labeled “Thermal Resistance” (R) should have units of : hr-ft2-oF / BTU . Also recall that the unit conductance is: U = 1/R.