Estimate the original heat transfer through the roof, and also add additional insulation somewhere to cat the heat loss by 30%. The overall average thermal resistance for the entire wall can be determined from: Rowent = 1/0 event where Umma = {U.c. Amestea +(Usce ad Use a value for the area fraction, fea=0.80 for between studs and 0.20 at studs in both the roof section and the ceiling section. External conditions and Roof Ceiling Dimensions The construction materials and R-values are given: Solar flux - 1000 W/m Ambient outside air temperature = 25 C for convection and = 15 C for radiation Inside air temperature = 20 C Use a roof area = 1 m, the roof pitch is 45 Roof and Ceiling Properties The construction materials and R-values are given below: R-value, m. c/ Between studs At studs 0.08 0.08 0.44 0.44 0.06 Construction of Pitched Roof 1. Outside surface, 5 km/hr wind 2. Asphalt shingle roofing 3. Building Paper 4. Plywood deck (3/8 in.) Sa. Nonreflective air space, 3.5 in. 5a. Wood stud, 2 by 4 in 6. Gypsum wallboard, 0.5 in. 7. Inside surface, 45 slope, stiliair 0.06 0.78 0.86 0.78 45 2 3 4 5a 5b 6 7 Construction of Attic Floor/House Ceiling 1. Still air in attic above ceiling 2. Linoleum (R-0.009 m.Cw) 3. Felt (R-0.011 m.c/W) 4. Plywood, 13 mm 5. Wood subfloor (R-0.166 m. c/w) 6a. Air space, 90 mm, nonreflective 6b. Wood stud, 38 mm by 40 mm 7. Gypsum wallboard, 13 mm 8. Still air below ceiling 3.58 0.45 0.45 0.63 0.63 R-value, m?. C/W Between studs At studs 0.12 0.12 0.009 0.009 0.011 0.011 0.11 0.11 0.166 0.166 0.16 0.63 0.079 0.079 0.12 0.12 Estimate the original heat transfer through the roof, and also add additional insulation somewhere to cat the heat loss by 30%. The overall average thermal resistance for the entire wall can be determined from: Rowent = 1/0 event where Umma = {U.c. Amestea +(Usce ad Use a value for the area fraction, fea=0.80 for between studs and 0.20 at studs in both the roof section and the ceiling section. External conditions and Roof Ceiling Dimensions The construction materials and R-values are given: Solar flux - 1000 W/m Ambient outside air temperature = 25 C for convection and = 15 C for radiation Inside air temperature = 20 C Use a roof area = 1 m, the roof pitch is 45 Roof and Ceiling Properties The construction materials and R-values are given below: R-value, m. c/ Between studs At studs 0.08 0.08 0.44 0.44 0.06 Construction of Pitched Roof 1. Outside surface, 5 km/hr wind 2. Asphalt shingle roofing 3. Building Paper 4. Plywood deck (3/8 in.) Sa. Nonreflective air space, 3.5 in. 5a. Wood stud, 2 by 4 in 6. Gypsum wallboard, 0.5 in. 7. Inside surface, 45 slope, stiliair 0.06 0.78 0.86 0.78 45 2 3 4 5a 5b 6 7 Construction of Attic Floor/House Ceiling 1. Still air in attic above ceiling 2. Linoleum (R-0.009 m.Cw) 3. Felt (R-0.011 m.c/W) 4. Plywood, 13 mm 5. Wood subfloor (R-0.166 m. c/w) 6a. Air space, 90 mm, nonreflective 6b. Wood stud, 38 mm by 40 mm 7. Gypsum wallboard, 13 mm 8. Still air below ceiling 3.58 0.45 0.45 0.63 0.63 R-value, m?. C/W Between studs At studs 0.12 0.12 0.009 0.009 0.011 0.011 0.11 0.11 0.166 0.166 0.16 0.63 0.079 0.079 0.12 0.12
