PASSIVE HOUSES IN TEXAS
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1 PASSIVE HOUSES IN TEXAS Shelly Pottorf, AIA, CPHC, LEED AP Principal, Architend Founder, Passive House Houston Co-Chair, AIA Houston Committee on the Environment
2 What is Passive House? A non prescriptive standard and a proven methodology......for exponentially smarter building
3 What is Passive House? a formidable set of skills for optimizing cost/benefit decision-making for a design team
4 What is Passive House? An energy standard that is the most ambitious in the world. Old New 4.75 kbtu/s.f. yr. max. heating demand 4.75 kbtu/s.f. yr. max. cooling demand 0.6 ACH50 max. air leakage 38 kbtu/s.f. max. Primary Energy demand from alan gibsons presentation
5 What is Passive House? Passive House buildings use 70-80% less energy than conventional buildings. (90% less energy for space conditioning) (Home Energy Rating System) EPA Energy Star V3 Department of Energy Challenge Home Passive House Net Zero feasible! Living Building Challenge Source: Environmental Building News
6 TAKING IT MAINSTREAM What is Passive House?
7 Main Principles of Passive Building
8 Main Principles of Passive Building BALANCE FOR HEATING SEASON GAINS Solar heat gain through windows Internal gains -people & pets -lights -equipment -cooking -showering/bathing LOSSES Losses through envelope -conduction -air exfiltration Losses through ventilation system
9 Main Principles of Passive Building BALANCE FOR COOLING SEASON LOSSES Losses through envelope -thermal mass GAINS Solar heat gain through windows Internal gains (same as heating season) Gains through envelope -conduction -air infiltration -radiation Gains through ventilation system
10 Main Principles of Passive Building Ingredients Climate Specific Design Optimize Thermal Envelope Air- Tightness Thermal Bridge Free Energy Recovery Ventilation Minimal Mechanical System
11 Climate Specific Design Tools of the CPHC: x Software uses Detailed Annual Local Weather Data Orientation and Size of Windows/Shading Fine-Tuned to Influence Solar Gain Performance Adjust knobs to balance the energy coming and going from the envelope for specific local climate R-Values SHGC U-Value ERV Eff.
12 Climate Specific Design COOLING SEASON LOADS BSC charts on latent loads Dehumidification and Cooling Loads from Ventilation Air; ASHRAE Journal, Nov. 1997
13 Design Tools Energy Model 1 - The Passive House Planning Package (PHPP) Energy balance software Optimize the envelope from the beginning Establish optimal window count, shading, and insulations levels THERM for thermal bridge calculations WUFI for moisture/condensation risk prediction ISSUES: hot humid climate cooling loads, humidity
14 Design Energy Model 2 - WUFI Passive Great for cost/benefit analysis, fixes shortcomings of model 1 Explains coupled heat and moisture transfer in building components Sketch up import
15 Hot & Humid Passive House LeBois House, Lafayette, LA Architect: Saft Architects First Certified Passive House in Hot & Humid 1,200 SF new construction floor system: unconditioned crawl space- CMU wall w/ R-21 continuous rigid insulation wall system: 2x6 advanced wood framing w/ rainscreen facade to exterior insulation includes open cell spray foam in cavity + continuous polyiso on exterior -R-28 Walls -R-55 Roof energy recovery ventilation ductless mini-split added dehumidifier
16 Hot & Humid Passive House LeBois House, Lafayette, LA
17 Texas Passive Houses Blaise House, Austin, TX Builder: Equitable Green Group First Certified Passive House in TX 1,600 SF remodel of a 1955 house double 2x4 stud wall construction w/ cellulose cavity insulation energy recovery ventilation w/ inline heating from a hot water heat exchanger 3/4 ton ductless mini-split for cooling
18 Texas Passive Houses Blaise House, Austin, TX
19 Texas Passive Houses Kennedy Residence, Pearland, TX Architect: Liz McCormick, CPHC new construction w/ 2 separate passive houses connected by a dogtrot wall system: 2x6 advanced wood framing w/ furred out electrical chase to interior and a rainscreen facade to exterior insulation includes cellulose in cavity + continuous mineral wool on exterior -R-22 Walls -R-37 Roof energy recovery ventilation geothermal heating & cooling
20 Texas Passive Houses Kennedy Residence, Pearland, TX
21 Texas Passive Houses Kennedy Residence, Pearland, TX
22 Texas Passive Houses Bass Residence, Lindale, TX Architect: Architend 1,600 SF new construction wall system: 2x6 advanced wood framing w/ rainscreen facade to exterior insulation includes cellulose in cavity + continuous polyiso on exterior -R-27 Walls -R-40 Roof energy recovery ventilation geothermal heating & cooling, CERV, or variable refrigerant flow ducted minisplit
23 Texas Passive Houses Bass Residence, Lindale, TX
24 Texas Passive Houses Bass Residence, Lindale, TX
25 Texas Passive Houses Bass Residence, Lindale, TX
26 WE NEED EVERYONE S PARTICIPATION TO GET THERE JOIN OUR GROWING MOVEMENT Passive House Houston spottorf@architend.com
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