THE WORLD'S LARGEST PASSIVE HOUSE BUILDING Cornell Tech NYC Campus Residential Building Overview High Rise vs. Low Rise Cornell Overview What’s Happening in the NE S© te ve n W in te r A sso cia te s, In c. 2 0 1 5 PH DIFFERENCES: HIGH RISE VS. LOW RISE S© te ve n W in te r A sso cia te s, In c. 2 0 1 5 High Rise vs. Low Rise Likely cooling dominated » Density of apartments & appliance loads » Lack of external shading devices » Additional loads such as fitness centers, elevators, DHW circulation pumps and line losses, retail space, etc. S© te ve n W in te r A sso cia te s, In c. 2 0 1 5 High Rise vs. Low Rise Envelope efficiency requirements of less concern than comfort criteria Less insulation in slabs and roofs can help reduce cooling loads! S© te ve n W in te r A sso cia te s, In c. 2 0 1 5 High Rise vs. Single Family Single Family High Rise Home PH 200,000 ft2 1600 ft2 Threshold kBtu/ft2 yr kBtu/ft2 yr kBtu/ft2 yr (kWh/m2 yr) (kWh/m2 yr) (kWh/m2 yr) Space heating demand 2.5 (8) 7.73 (24.4) 4.75 (15) Space cooling demand 4.75 (15) 3.95 (12.5) 5.39 (17) Primary energy demand 37 (117) 58 (183) 38 (120) PH Yes No -- S© te ve n W in te r A sso cia te s, In c. 2 0 1 5 FAÇADE ISSUES Curtain Wall Pro’s » Continuous insulation on the exterior of the building » Panels constructed in factory, less variability of install quality Con’s » Attachments to building & other panels – » Final air sealing done from exterior » Alignment of air, water, vapor barrier difficult » Fire rated insulation needed S© te ve n W in te r A sso cia te s, In c. 2 0 1 5 FAÇADE ISSUES Roof » Parapets » Drain penetrations on flat roofs Foundation » Loads can be 5000 psi: 1800 psi best compressive strength found to date Windows » Limited selection of applicable windows » ISO values are required, no direct conversion from NFRC S© » Overhangs – not typical in high rise teve n W in » More likely to use architectural elements ter A sso cia te s, In c. 2 0 1 5 Comfort Criteria » Interior surface temperatures should not deviate by more than 7.6 F from the average operative temperature on the inside; » the surface temperature must not be lower than 55.4 F or greater than 132 F at any point; » the surface temperature of the floor must be between 66 F and 81 F. S© te ve n W in te r A sso cia te s, In c. 2 0 1 5 Potential Packages # of Heating Cooling Primary ft2 units Roof Wall Windows Foundation Demand Demand Energy R-value R-value U-value/SHGC R-value kBtu/ft2∙ yr kBtu/ft2∙ yr kBtu/ft2∙ yr #1 1267 1 90 48 0.16/0.62 21/37 4.2 0.33 26.7 #2 8770 10 102 46 0.15/0.6 20/41 4.47 1.16 28.9 #3 34,927 30 40 33 0.21/0.32 33/10 4.23 4.84 34.3 #4 39,482 52 60 30 0.25/0.33 10/10 3.24 5.1 37.6 S© te ve n W in te r A sso cia te s, In c. 2 0 1 5