Passive House Overview and Case Study Todd Collins AE Building - - PowerPoint PPT Presentation

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Passive House Overview and Case Study Todd Collins AE Building - - PowerPoint PPT Presentation

Mar 10, 2023 10 likes •214 views

Passive House Overview and Case Study Todd Collins AE Building System s ( 3 0 3 ) 7 4 8 -4 3 1 5 tcollins@aebuildingsystem s.com Erik Lobeck W orkshopL ( 9 7 0 ) 2 9 1 -9 5 4 6 elobeck@com cast.net Passive House Brief History

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SLIDE 1

Passive House – Overview and Case Study

Todd Collins – AE Building System s ( 3 0 3 ) 7 4 8 -4 3 1 5 tcollins@aebuildingsystem s.com Erik Lobeck – W orkshopL ( 9 7 0 ) 2 9 1 -9 5 4 6 elobeck@com cast.net

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SLIDE 2

Passive House Brief History

Passive Solar

  • Over heating
  • Significant losses at

night

Super Insulation

  • Leaky walls create

potential for Mold and Rot

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SLIDE 3

PassivHaus Concepts

1 . Airtight - m inim izes heat losses and m oisture diffusion into w all assem bly 2 . Optim al Solar Orientation and Shading – optim ize solar gains for w inter, m inim izing gains for the sum m er – SHGC for elevation 3 . Com pact Shape – efficient surface to volum e ratio 4 . Continuous I nsulation - create steady indoor tem peratures that w on’t drop below 5 0 degrees w ithout heating source 5 . Therm al Bridge Free Construction – avoid conduction losses and condensation / building deterioration 6 . High perform ance w indow s – u-values < 0 .1 4 7 . Balanced Ventilation w ith Heat Recovery w ith m inim al Space Conditioning System - exceptional efficiency, indoor air- quality and com fort.

  • Dr. Wolfgang Feist
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SLIDE 4

Passive House Standard Metrics & Requirem ents

( discounted interior conditioned floor area - TFA)

  • Annual Heating Energy

Dem and

  • Annual Cooling Energy

Dem and

  • Annual Total Prim ary Energy

Dem and

  • Air Leakage @ 5 0 Pascals

4 .7 5 kBtu/ ft2 yr or [ 1 5 kW h/ m 2 a] 4 .7 5 kBtu/ ft2 yr or [ 1 5 kW h/ m 2 a] 3 8 kBtu/ ft2 yr or 1 1 .1 kW h/ ft2 [ 1 2 0 kW h/ m 2 a] 0 .6 ACH5 0

GOAL – 90% to 95% reduction in energy required for space conditioning

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SLIDE 5

Low Surface Temp = Discomfort

No ! 6 ° F 5 6 F 6 8 ° F

conventional house

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SLIDE 6

Higher Surface Temp = Comfort

YES! 6 ° 6 4 ° F 6 8 ° F Passive House

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SLIDE 7

Passive House Economics:

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Passive House – Not just for single family residences

Multi-family Offices Schools

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SLIDE 9

Passive House Does Not Have to be Ugly

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SLIDE 10

Passive House Does Not Have to be Ugly

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SLIDE 11

Passive House Does Not Have to be Ugly

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SLIDE 12

Passive House

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SLIDE 13

DIAGON ALLEY HOUSE GOALS

  • 1_CREATE ATTRACTIVE (I HOPE) LOW MAINTENANCE RENTAL UNIT

– PASSIVE HOUSE A GOOD FIT….Methodology Minimizes Mech. Complexity-Mechanical things always seem to fail at worst time- EX: No heat, Mud Season, Saturday Night @ 3 AM.

  • 2_TEST BED FOR “ADVANCED” BUILDING TECHNIQUES

– Learn on “own” project rather than someone else’s project. Noble, eh? – -Project was of appropriate scale as a test bed. Quality, not quantity.

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SLIDE 14

FIGHT THE GOOD FIGHT

  • Almost 5 months of planning for 650 SF…

– Materials Research – Energy Modeling – Design optimization

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SLIDE 15

CONCLUSIONS AT DESIGN PHASE

  • SOLAR ORIENTATION PENALTY

Old town lot platted opposite the ideal for solar gain. (Short Side South)- Move to Brooklyn?

  • SMALL HOUSE PENALTY

Surface to volume ratio less than ideal

  • TOUGH, TOUGH CLIMATE

Same climate zone as much of Alaska!

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SLIDE 16

SALLY FORTH

  • Despite calculations coming in better than

double (!) Passive House Standard…….Goin’ Fer It! Still really, really good and in alignment with goals. Focus on building what I call the “DGH” (Damn Good House).

  • Still focus on spending money on envelope

rather than mechancical infrastructure. PH mantra-Insulation doesn’t “break.”

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SLIDE 17

WHAT WORKED?

  • SUPERINSULATED envelope. Designed and

built according to research performed by “Cold Climate Housing Research Center” in

  • Alaska. Works, but since moved on to systems

with less “layers.”

  • REDUCTION of mechanical systems and

redundant systems.

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SLIDE 18

WHAT DIDN’T WORK…

  • Attached garage weak link in thermal

envelope (20 minute door, even though insulated, leaches heat from semi-conditioned garage space.

  • Kitchen Vent hood to outside-air sealing weak
  • link. <0.2 ACH plugging vent hood

penetration, 1.0 ACH unplugged

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SLIDE 19

WHERE workshopL GOES FROM HERE

  • Dependent upon project/site, but applying PASSIVE HOUSE

methodology, products, and detailing to all designs to greatest extent possible-best practice.

  • Trying to fall in between two extremes of current IECC

standards and Passive House Standard….back to the DGH.

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SLIDE 20

DGH-Pearl Street Residence