PHIUS Latest Exam Questions With Complete Solutions

You are performing an energy model of a house intended for four inhabitants. There are 5 bedrooms and the interior conditioned floor area is 2200 s.f. PHIUS requires a Primary Energy limit of 3840 kWh/ for certification. What is the Specific Primary Energy limit for this house? - ANS 35.7 kBTU/ An architect on a passive house project team in Chicago proposes glazing units with R-5 (U-0.2) glazing. Chicago's ASHRAE 99% design temperature is 4.4°F. What will the interior surface temperature of the glazing be at that design temperature? Round as needed to two (2) places for your final result. Do not add surface films to the given R-value of the glazing. - ANS 58.59 °F A window has the following attributes Uglazing = 0.09 Btu/2 .°F Uframe = 0.14 Btu/2 .°F Window Width = 3ft Window Height = 5ft Frame Thickness = 3in Psi spacer = 0.023 Btu/ .°F Psi install = 0.015 Btu/ .°F Calculate installed U value of the window (Uw-installed). Do NOT use rounding during the calculation. Round manually to the 3rd decimal place for the result. (Select the Best Answer) - ANS Uw installed = 0.140 BTU/2 .F You wish to compare the annual heat loss through two different wall assemblies you are considering for a passive house enclosure. Wall 1 has an R-value of R-20 (2.F/Btu). Wall 2 has an R-value of R-40 (2.F/Btu). The project's climate has 4000 Heating Degree Days and the net exterior wall area is 2000 ft2. What is the difference in annual heat loss between the two assemblies? (Select the Best Answer) - ANS 4800 kBtu A PHIUS+ retrofit for a small office building in Jacksonville, FL with 5000 ft2 interior conditioned floor area has an outdoor concrete terrace of 50 ft length on the second floor. The terrace is not thermally broken. A serious thermal bridge remains at the terrace after having planned for an exterior insulation finish system to meet PHIUS+ requirements. The thermal bridge coefficient for the terrace is 0.30 BTU/.°F. The annual heat demand of the building is calculated at 1.6 kBTU/ before the heat loss from the terrace is taken into consideration. The project is located in a 1635 °F.day/yr climate. The outdoor winter design temperature is 41.7°F. The PHIUS+ annual heat demand certification threshold for the project is 1.8 kBTU/ Calculate additional annual heat loss through the terrace if kept un-insulated. (Do NOT use rounding during the calculation. (Round manually to the 3rd decimal place for the - ANS Q = 588.6 kBtu/yr A small field outpost designed to meet the PHIUS+ 2018 passive building criteria has a iCFA of 950 ft2 and peak heat loss through the envelope of 220 BTU/hr, peak heat loss through ventilation of 340 BTU/hr, peak internal gains of 3100 BTU/hr and peak solar gains of 2200 BTU/hr. What is the minimum BTU/hr the cooling system must be capable of delivering to maintain an interior air temperature of 77°F on the hottest day of the year? (Select the Best Answer) - ANS 4740 BTU/hr You have a client in Alaska interested in building a passive house. He was planning on an R-40 wall before talking to you. You are recommending a starting target of R-80 for walls. The climate has