So I am going to use the current design for our Hunter Hill House country home as the basis for determining Passive House criteria.
Passive House Calculations start with area calculations of iCFA (Indoor Conditioned Floor Area) and Exterior Envelope (including foundation slab).
iCIFA Calcs
The ground floor area, exclusive of garage, is 2,700 SF (75ft x 36ft)
The loft level (inclusive of mechanical and storage) is 1,075 SF of space with a headroom greater than 7 feet.
The total iCFA is 3,775 SF.
Exterior Envelope Calcs
The footprint of the occupied building is 3,150 SF (36 ft x 87.5ft)
The north and south wall total surface area is 1,500 SF (75ft x 10ft x 2)
The east and west wall total surface area is 1,044 SF (36ft x 14.4ft x 2)
The roof area is 3,500 SF (20ft x 87.5ft x 2)
The total Exterior Envelope Area is 9,194 SF
Exterior Envelope Area / iCFA = 2.44
iCFA / Persion = 943.75
PHIUS Data
The nearest PHIUS data is for Monticello, NY, which is 25 miles from our site. Our site has an elevation of 2,200 ft; Monticello has an elevation of 1,400 ft. The 800 ft elevation difference will undoubtedly have an impact on these values.
Sample R Values for Climate Zone 6
On page 19 of The Phius + 2018 Passive House Standard Certification Guidebook v2.1 they indicate the following guidelines for R value ratings for Climate Zone 6:
Wall: R-39 to R-51
Roof: R-70 to R-90
Slab: R-28 to R-40
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