2. Use the attached psychrometric chart and the figure below answer the following questions. Figure 2.12 Temperature gradient through an exterior wall RSI Wall Component 1 Exterior al im Tacos corponert RAR ATT 0.039 0.0053 Metalling 0.0211 0.157 20 10 16 14. 121 10 a 0 4+ 3 Airspace with strapping 0.0300 0.224 450mm (2") oxtruded polystyrene 1.761 (10) 13.125 Theoretical lemperature gradient S30 x 89 mm (24") studs with ball insulation 2.113 (12) 15.749 78 1400 (RS) 10.502 638 x 64 mm (2x3) Torontal strapping wat ball insulation 7 Gypsum wall board Interior air film 0.0062 0.046 00211 0.1572 AT 40C Total RSI, 5.1007 Winter conditions Inside temperatura +20C Ouis de temperature AT across all assombly 20 200 -10 -20 Source: CHBA Builder's manual The inside air dry bulb temperature is given on the wall assembly diagram as 20C. For your assignment, the inside air RH=60%. Record the dew point temperature. (Hint: see your notes on Psychrometrics for the method to calculate dew point temperature) Position a vapour barrier in this insulated wall assembly between layers 5 and 6. (Find the temperature between layers 5 and 6) Will this recessed vapour barrier experience interstitial condensation? Would any inside air under your conditions (20C, RH=60%) that reaches the inside surface of the vapour barrier condense on the inside surface of the vapour barrier? 3 a. Use the section of Table 8.1 shown below to calculate the thermal resistance (RSI) of the following material. What is the thermal resistance (RSI) in metric units for a piece of plywood that is 0.019m thick? Wet Buthor Studio Temperature 120 125 130 140 145 O CHROMETRIC CHART 45 SO SS Carrier 0033 0032 0031 LAL TEMPERATURES CON -0.030 DOL C UNITS -0.029 0.028 nic Pressure 101.325 kPa ON EL SF Properties and Enthalpy Deviation Lines are force 0.027 0.026 0.025 0.024 0.023 0.022 30 Or 0.021 0.020 /kg Dry Air 0019 0.018 35 fortunadame be 0.017 0.016 F 0015 0014 0013 Enthal 45 10 Enthalb Deyilation Kiko Day! RA 0012 - WA 001 ODIO 0009 -0.008 -0.007 -0.006 0005 0.004 0.002 Moisture Content 0.001 20 Dry Bulb Temperature 25 06 -0.00 > 0.00 0.85 Volume m'g Dry 0.90 2. Use the attached psychrometric chart and the figure below answer the following questions. Figure 2.12 Temperature gradient through an exterior wall RSI Wall Component 1 Exterior al im Tacos corponert RAR ATT 0.039 0.0053 Metalling 0.0211 0.157 20 10 16 14. 121 10 a 0 4+ 3 Airspace with strapping 0.0300 0.224 450mm (2") oxtruded polystyrene 1.761 (10) 13.125 Theoretical lemperature gradient S30 x 89 mm (24") studs with ball insulation 2.113 (12) 15.749 78 1400 (RS) 10.502 638 x 64 mm (2x3) Torontal strapping wat ball insulation 7 Gypsum wall board Interior air film 0.0062 0.046 00211 0.1572 AT 40C Total RSI, 5.1007 Winter conditions Inside temperatura +20C Ouis de temperature AT across all assombly 20 200 -10 -20 Source: CHBA Builder's manual The inside air dry bulb temperature is given on the wall assembly diagram as 20C. For your assignment, the inside air RH=60%. Record the dew point temperature. (Hint: see your notes on Psychrometrics for the method to calculate dew point temperature) Position a vapour barrier in this insulated wall assembly between layers 5 and 6. (Find the temperature between layers 5 and 6) Will this recessed vapour barrier experience interstitial condensation? Would any inside air under your conditions (20C, RH=60%) that reaches the inside surface of the vapour barrier condense on the inside surface of the vapour barrier? 3 a. Use the section of Table 8.1 shown below to calculate the thermal resistance (RSI) of the following material. What is the thermal resistance (RSI) in metric units for a piece of plywood that is 0.019m thick? Wet Buthor Studio Temperature 120 125 130 140 145 O CHROMETRIC CHART 45 SO SS Carrier 0033 0032 0031 LAL TEMPERATURES CON -0.030 DOL C UNITS -0.029 0.028 nic Pressure 101.325 kPa ON EL SF Properties and Enthalpy Deviation Lines are force 0.027 0.026 0.025 0.024 0.023 0.022 30 Or 0.021 0.020 /kg Dry Air 0019 0.018 35 fortunadame be 0.017 0.016 F 0015 0014 0013 Enthal 45 10 Enthalb Deyilation Kiko Day! RA 0012 - WA 001 ODIO 0009 -0.008 -0.007 -0.006 0005 0.004 0.002 Moisture Content 0.001 20 Dry Bulb Temperature 25 06 -0.00 > 0.00 0.85 Volume m'g Dry 0.90
