WDMA Technical Conference Chicago, IL 28 June 2016 BENEFITS OF INTERIOR INSTALLED HIGH PERFORMANCE INSULATING GLASS FOR COMMERCIAL RETROFIT APPLICATIONS – A CASE STUDY WDMA Technical Conference Chicago, IL 28 June 2016

Outline of discussion Introduction & Background – 400 Market Street, Philadelphia PA, USA System Description – Interior Installed Low-e Insulating Glass Test Configuration & Conditions Energy Comparison Surface Temperature Comparison Cost Comparison Conclusions

Introduction & Background 400 Market Street, Philadelphia PA 12-story office building Constructed in 1971 with monolithic clear glazing After market window film applied to interior lites Prepared By: Home Innovation Research Labs Funded by U.S. Department of Energy, Project #DE-­‐EE0004015 Presentation prepared collaboratively between Quanex Building Products and JE Berkowitz LLC

Interior Installed Low-e IGU Interior IGU construction: 2 lites 5 mm glass PPG SB60 low-e coating on surface #3 ½” (13 mm) argon glazing gap Aluminum spacer with PIB primary and silicone secondary sealants Mounted interior of monolithic lite Separated by applied flexible spacer Interior mechanical trim applied to existing sill framing

Interior Installed Low-e IGU Overall system center-of-glass U-value = 0.18 Btu/hr-ft2-F (1.02 W/m2-K) Overall system Solar Heat Gain Coefficient = 0.44

Test Specimen Configuration Two pairs of side-by-side offices chosen for comparison Room Dimensions: 10’ x 12’ (3.05 m x 3.66 m) Glazing Dimensions: 6’ x 6’ (1.83 m x 1.83 m ) Room pair #1 located on 6th floor facing east Room pair #2 located on 11th floor facing north One glazing per pair retrofitted after film removal

Test Conditions Air leakage testing demonstrated minimal difference between original and retrofit energy transfer effects due to air leakage are deemed negligible All rooms isolated from building mechanical (HVAC) systems Independent heating/cooling equipment in each office to maintain temperature: Heating demand – 69 F (20.6 C) Cooling demand – 71 F (21.7 C) Incandescent lighting utilized to simulate thermal loads from occupants and equipment Monitoring conducted from: Nov 2011 – Oct 2012 Heating 1 Dec 2011 – 29 Feb 2012 Cooling 27 Jul 2012 – 30 Sep 2012

Office Energy Use Comparison

Building Energy Use Comparison Energy usage based on monthly utility billing following full building retrofit

Building Energy Use Comparison

Surface Temperature Comparison Inside Glass Surface Temperature Profile East Facing North Facing Low-e Retrofit Panel (°F/°C)   Original Single Pane/Film (°F/°C) Winter, Maximum during day 70-76/21-24 75-85/24-29 65/18 52/11 Winter, Minimum during day 57/14 33-40/1-4 16 - 17 34-37/1-3 Summer, Maximum during day 84/29 104-109/40-43 23 Summer, Minimum during day 72/22 74/23 71/22

Installed Cost Comparison Compares estimated cost of “rip-out and replace” (ROR) retrofit with specified double-glazed IGU to actual installed cost of internally installed low-e IGU for entire building Does not include additional long-term savings due to triple-glazed system resultant of internally installed low-e IGU vs. double-glazed ROR. Total Openings: 532 Total Glazing Area: 18.9 mft2 (1759 m2) System Installed Cost Cost per Opening Cost per Area Cost Reduction ROR $1,879,545 US$3533 $99/ft2 ($1068/m2) base Interior Retrofit IGU $848,891 US$1596 $44/ft2 ($484/m2) -54.8%

Conclusions Heating energy reductions of between 40% and 60% compared to monolithic glazing with applied film Cooling energy savings up to 35% compared to monolithic glazing with applied film Whole building post-retrofit total energy savings of up to 30% Interior surface temperatures kept closer to room-side temperature year-round; greater condensation resistance in winter and cooler in summer Less than half the cost of a ‘rip-out-replace’ full glazing replacement Additional Benefits: Minimize internal disruption (off hours) No change to exterior envelope or weatherization No scaffolding, rigging, etc. for multi-story/high-rise retrofit Less total time for full building retrofit

Questions??? Tracy G. Rogers Quanex Building Products Email: tracy.rogers@quanex.com Phone: 01 603 661 4096