LOW-RISE APARTMENT BUILDING PROTOTYPE HIGH PERFORMANCE PV Genera on Poten al 17.9 kbtu/ 2/yr

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1 LOW-RISE APARTMENT BUILDING PROTOTYPE HIGH PERFORMANCE 40 kbtu/sf/yr 35 kbtu/sf/yr 30 kbtu/sf/yr 25 kbtu/sf/yr 20 kbtu/sf/yr 15 kbtu/sf/yr 10 kbtu/sf/yr 5 kbtu/sf/yr 0 kbtu/sf/yr 11.9 kbtu/ft2/yr 36.0 Baseline 17.9 kbtu/ft2/yr 11.9 High Performance 120 mbtu 100 mbtu 80 mbtu 60 mbtu 40 mbtu 20 mbtu 0 mbtu 13.9 PHIUS - IES 40000kWh 35000kWh 30000kWh 25000kWh 20000kWh 15000kWh 10000kWh 5000kWh 0kWh Jan Feb Mar Apr May Jun Jan Feb Mar Apr May Jun PV Genera on Poten al 17.9 kbtu/ 2/yr Jul Aug Sept Oct Nov Dec Heating Cooling DHW Lighting Equipment Fans/ Pumps 24.0 PHIUS - WUFI The low-rise apartment building high performance prototype was developed by testing improvements on the envelope elements and different mechanical system options. The result is an improved envelope built to a higher construction standard to reduce losses due to infiltration, a high-efficiency variable refrigerant flow system, and reduced energy use for lighting and plug loads. The modeled performance is 67% better than the baseline, and has a HERS index of 40. Heating loads are dramatically reduced over conventional code construction. The primary energy uses in the building is occupant driven loads lighting and plug loads. Jul Aug Sep Oct Nov Dec kwh Generated kwh Demand PROJECT INFORMATION Low-Rise Prototype 48 Units, 1, 2, 3BR 147 Residents 16.6 DHW 17.5 cfm/person, continuous ventilation Area Floor: 62,170 ft2 Roof: 20,728 ft2 Exterior Wall: 24,781 ft2 Opening: 4,295 ft2 WWR: 17.3 Surface Area / Volume Ratio: 0.08 Location and Climate Minneapolis, Minnesota Climate Zone 6 HDD: 8217 CDD: 831 SPECIFICATIONS Optimized Equipment Variable Refrigerant Flow System Heating CoP , Cooling SIEER Natural Gas Hot Water Heater, 0.95 EF, Gal Storage Lighting Power Density: w/ft2 Equipment Power Density: w/ft2 Optimized Envelope Roof: R-83.3 Wall: R-42.5 Glazing: Whole Window U-0.188, SHGC 0.26 Slab: R-17 Infiltration: 0.9 ACH50 The chart above shows the annual energy production potential for the low-rise building with a roof top photovoltaic array (left), and a comparison of monthly production and demand (right). The blue area on the pie chart shows the annual production relative to total load, which shows the prototype is net-positive energy and can meet all annual energy needs on site. Minnesota Sustainable Housing Initiative Multi-Family Housing High Performance Prototypes 2017 Regents of the University of Minnesota, Center For Sustainable Building Research

2 LOW-RISE APARTMENT BUILDING PROTOTYPE HIGH PERFORMANCE IES VE Modeling Assumptions Massing Building Area: 62,170 ft2 Number of Floors: 3 Floor To Floor Height: 10-0 Envelope Roof Insulation: R-83.3 Wall Insulation: R-42.5 Glazing U-Factor: U Glazing SHGC: 0.4 Window to Wall Ratio: Slab Insulation: R-17 Construction Tightness: 0.06 ACHnat Occupancy Number of Residents: 147 Daily Hot Water Use: 16.6 gallons per day, 120 System HVAC System: Variable Refrigerant Flow System* Cooling Efficiency: SSCOP Heating Efficiency: SCoP Heat Recovery: None Ventilation Rate (Units): cfm/person, continuous Heating Set Point: 69 Cooling Set Point: 76 Hot Water Heater Efficiency: 95% *Modeled with Daikin VRV Systems Plug-in for IES VE Internal Loads Lighting Power Density (Units): 0.19 w/ft2 Equipment Power Density (Units): 0.25 w/ft2 Intent and Modeling The intent of the building prototypes is to better understand a step progression from current practice toward low and net-zero energy construction. Neither the proposed building performance nor the baseline building performance are predictions of actual energy consumption or costs, but provide a relative comparison of the proposed design. The modeling of this prototype was done using IES Virtual Environment REM/Rate was used to generate the HERS Index based on the building on the IES model specifications. The energy production estimate assumes a flat roof with 70% of the tool roof area dedicated to PV panels. Minnesota Sustainable Housing Initiative Multi-Family Housing High Performance Prototypes 2017 Regents of the University of Minnesota, Center For Sustainable Building Research

3 Fuel Summary Property Weather: Townhome High Performance Townhome High Performance.blg Organization Building Knowledge, Inc Patrick OMalley Builder HERS Projected Rating 12/27/17 Rater ID: Annual Energy Cost Electric 3301 Annual End-Use Cost Heating 855 Cooling 189 Water Heating 816 Lights & Appliances 1440 Photovoltaics -0 Service Charge 480 Total 3781 Annual End-Use Consumption Heating (kwh) 9379 Cooling (kwh) 2071 Water Heating (kwh) 8933 Lights & Appliances (kwh) Total (kwh) Annual Energy Demands kw Heating 10.4 Cooling 2.0 Water Heating (Winter Peak) 1.7 Water Heating (Summer Peak) 1.3 Lights & Appliances (Winter Peak) 1.3 Lights & Appliances (Summer Peak) 2.9 Total Winter Peak 13.3 Total Summer Peak 6.2 Utility Rates Electricity Xcel Elec $.090 This information does not constitute any warranty of energy cost or savings Noresco, Boulder, Colorado.

4 Property Home Energy Rating Certificate HERS Rating Type: Projected Rating Certified Energy Rater: Patrick OMalley Rating Date: 12/27/17 Rating Number: Registry ID: Projected Rating: Based on Plans - Field Confirmation Required. HERS Index: 43 Efficient Home Comparison: 57% Better General Information Conditioned Area 5124 sq. ft. House Type Multi-family, whole building Conditioned Volume cubic ft. Foundation Slab Bedrooms 8 Mechanical Systems Features Heating: Air-source heat pump, Electric, 3.3 COP. Cooling: Air-source heat pump, Electric, 4.0 COP. Water Heating: Conventional, Electric, 0.95 EF, 40.0 Gal. Duct Leakage to Outside NA Ventilation System Balanced: HRV, 191 cfm, 54.0 watts. Programmable Thermostat Heat=Yes; Cool=Yes Estimated Annual Energy Cost Use MMBtu Cost Percent Heating 31.3 $837 22% Cooling 6.3 $169 5% Hot Water 30.5 $816 22% Lights/Appliances 54.0 $ % Photovoltaics -0.0 $-0-0% Service Charges $480 13% Total $ % Criteria This home meets or exceeds the minimum criteria for the following: 2009 International Energy Conservation Code 2012 International Energy Conservation Code Building Shell Features Ceiling Flat R-85.0 Slab R-10.0 Edge, R-17.0 Under Sealed Attic NA Exposed Floor NA Vaulted Ceiling NA Window Type U-Value: 0.188, SHGC: Above Grade Walls R-29.0 Infiltration Rate Htg: 1.50 Clg: 1.50 ACH50 Foundation Walls NA Method Blower door test Lights and Appliance Features Percent Interior Lighting Range/Oven Fuel Electric Percent Exterior Lighting Clothes Dryer Fuel Electric Refrigerator (kwh/yr) 550 Clothes Dryer EF 3.01 Dishwasher (kwh/yr) 270 Ceiling Fan (cfm/watt) 0.00 Building Knowledge PO Box 1376 Burnsville MN This information does not constitute any warranty of energy cost or savings Noresco, Boulder, Colorado. The Home Energy Rating Standard Disclosure for this home is available from the rating provider.

5 HERS PERFORMANCE ENERGY RATING CERTIFICATE 43 Projected Rating: Based on Plans - Field Confirmation Required. Estimated Annual Energy Cost Estimated Annual Energy Consumption Heating 169 Cooling 816 Water Heating 1,447 Lights & App 0 Photovoltaics 480 Service Charge 3,750 Total MMBtu/yr Heating 6.0 Cooling 30.0 Water Heating 54.0 Lights & App 0.0 Photovoltaics Total Address House Type Multi-family, whole building Cond. Area 5124 sq. ft. Rating No. Issue Date December 28, 2017 Certification Inspected and Tested Annual Estimates* Electric(kWh): C02 emissions(tons): 25 Annual Savings**: $6189 * Based on standard operating conditions ** Based on a HERS 130 Index Home Building Knowledge PO Box 1376 Certified Rater Patrick OMalley Rater ID Registry ID Rating Date 12/27/17 This information does not constitute any warranty of energy cost or savings Noresco, Boulder, Colorado. The Home Energy Rating Standard Disclosure for this home is available from the rating provider.