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Home My WebLink About4114046_Verification_Final_Report_20151204 Verification Report ICCSD New South Elementary School Iowa City, Iowa December 04, 2015 4114046 (7590.0248) Prepared for by 877.939.1874 midamericanenergy.com 877.938.1588 twgi.com MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 1 Executive Summary This report continues the Commercial New Construction program for the ICCSD New South Elementary School. MidAmerican Energy Company offers the Commercial New Construction program to assist owners and design teams in evaluating potential energy conservation strategies for new and renovated building projects during the design and construction processes. During the design phase, the building Owner selected a number of energy conservation strategies. In response, MidAmerican Energy offered an incentive for the implementation of these strategies. The new construction work has been completed and The Weidt Group has verified that many of these conservation strategies have been installed. These measures provide projected energy cost savings of over $71,000 per year, in relation to the building baseline. Table A, below, provides further economic analysis of the energy conservation investments. Table A. Energy Conservation Investments ‐ Simple Payback Analysis Project Incremental Construction Cost $416,984 Final MidAmerican Energy Incentive * $170,582 Project Adjusted Incremental Cost $246,402 Annual Energy Cost Savings $71,076 Payback, with incentive (in years) 3.5 * The MidAmerican Energy Commercial New Construction incentive cannot reduce the simple payback below one year, may not exceed 70% of the total bundled incremental strategy costs, and is capped at $1 million per building. The simple payback analysis shows that the MidAmerican Energy incentive has helped reduce the incremental costs associated with the energy conservation strategy investments in this building, resulting in a payback of 3.5 years. For more information, please refer to the following report. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 2 Table of Contents Executive Summary .......................................................................................... 1 Introduction ...................................................................................................... 4 Process .............................................................................................................. 5 Strategy Summary List ...................................................................................... 6 Summary of Results ........................................................................................ 17 Building Summary ........................................................................................... 20 Category Summary ......................................................................................... 21 MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 3 Project Participants Project Team Owner ................................................................................................. Iowa City Schools Duane Van Hemert Architect ......................................................................................... OPN Architects, Inc. Joe Tursi Mechanical Engineer ........................................................................... Design Engineers Jared Ramthun Stephanie Riggan Electrical Engineer ............................................................................... Design Engineers Jonathan Gettler Energy Design Assistance Team Electric and Gas Utilities ................................................................ MidAmerican Energy Marcus Galante Claudia Hernandez Amber Moser Carly Smith Energy Design Assistance Consultant .................................................. The Weidt Group Jason Steinbock Verification Consultant ........................................................................ The Weidt Group John Sidey MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 4 Introduction This report documents the results of verification for several energy conservation strategies for the ICCSD New South Elementary School project, and shows the results of verification as compared to the baseline model. The report follows the previous Commercial New Construction program report (from May 16, 2014) for the project and serves as a final document for verifying energy savings strategies implemented at this new building located in Iowa City, Iowa. For this project, the Owner selected Bundle 2 for implementation. For more information about selected bundle composition and strategy results, please see the Bundle Requirements Document (from May 16, 2014). Upon selection, The Weidt Group verifies the selected strategies via Construction Documents review, on site verification of the strategies selected, and construction submittals. The Weidt Group visited the ICCSD New South Elementary School on October 30, 2015. During this visit we verified the energy conservation strategies that had been chosen for implementation. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 5 Process The following list provides the process steps for this energy conservation program.  Commercial New Construction program Establish goals and intentions Computer modeling of baseline, strategies, and bundles  Bundle Selection by the Owner  Bundle Requirements Document Summarizes key features/verification plan for all bundle strategies  Construction Documents Review Reviews drawings to locate the energy conservation measures and notify the Design Team of any changes from the selected bundle  Verification Study (following project completion and occupancy) Request construction documents Request submittals (e.g., glazing, insulation, cooling, heating plants) Locate the energy conservation measures on site  Final Verification Report Detail the findings of the verification process Estimate of final energy savings for the building Document final incentive  MidAmerican Energy Incentive Payment MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 6 Strategy Summary List The following table provides a complete list of the modeled energy conservation strategies that were selected by the Design Team for installation. Table 1. Bundled Strategies and Verification Results ID Strategy Description Portion of Total kWh Savings Modeled Verified as Modeled? Portion of Total kWh Savings Verified Architectural EWC02 R-20 wall assembly 4% Yes 4% ERC02 R-25 roof assembly 2% Yes 2% WGB01 Curtainwall glazing - design team provided 4% Yes 5% WGC01 Solera glazing 4% Partial 3% Electrical DGA02 Dimming Daylighting - Art / Music Classrooms <1% Partial <1% DGA03 Dimming Daylighting - Gym <1% Yes <1% DGA04 Dimming Daylighting - Media Center <1% Yes <1% DGA05 Dimming Daylighting - Lobby, Vestibules, Stairs <1% Yes <1% DGA06 Dimming Daylighting - Commons <1% Yes <1% DGA07 Dimming Daylighting - Multi-Purpose <1% Yes <1% LCCL1 Classroom occupancy sensor control 1% Yes 1% LCCL4 Classroom banked switching <1% Yes <1% LCAM1 Art/Music Classroom occupancy sensor control <1% Yes <1% LCCC1 Computer Classroom occupancy sensor control <1% Yes <1% LCCC4 Computer Classroom banked switching <1% Yes <1% LCCI1 Corridor occupancy sensor control <1% Yes <1% LCRR1 Restroom occupancy sensor control <1% Yes <1% LCLO1 Lobby occupancy sensor control <1% Yes <1% LCPO1 Private office occupancy sensor control <1% Yes <1% LCCN1 Conference occupancy sensor control <1% Yes <1% LCGY1 Gym occupancy sensor control <1% Yes <1% LCGY5 Gym manual dimming <1% Yes <1% LCMC1 Library occupancy sensor control <1% Yes <1% LCDN1 Multi Purpose occupancy sensor control <1% Yes <1% LCCM1 Commons occupancy sensor control <1% Partial <1% LCKT1 Serving Kitchen occupancy sensor control <1% Yes <1% LCST1 Storage occupancy sensor control <1% Yes <1% LCWK1 Workroom occupancy sensor control <1% Yes <1% L02BW Building wide 30% lower than 90.1-2007 4% Yes 7% MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 7 ID Strategy Description Portion of Total kWh Savings Modeled Verified as Modeled? Portion of Total kWh Savings Verified Mechanical MGH03 2-stage ground heat pumps - Alternate 2 w/VFD 56% Yes 57% MOA02 CO2 control of OA - media center, gym, multi-purpose 2% Yes 2% MOA03 Transfer air: multi-purpose to kitchen <1% Yes <1% MOA04 Transfer air: classrooms to restrooms <1% Yes <1% MOA05 Transfer air: offices to restrooms <1% Yes <1% MOA09 Low wall classroom return 2% Yes 2% MHRT1 Total heat recovery - Alt 1 18% Partial 17% Total Savings 100% 104% MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 8 Summary Based on the Verification site visit and submittals received, the building is currently saving 61% compared to the Baseline. As shown in Table 1, we have been able to locate 104% of the documented, Bundle 2 savings. The list below details items that are different from the Selected Bundle. Wall Assembly  The verified wall assembly R‐value is higher than expected, resulting in more savings. Roof Assembly  The verified roof assembly R‐value is higher than expected, resulting in more savings. Glazing  The verified curtainwall glazing U‐factor and solar heat gain coefficient are lower than expected, resulting in more savings.  The verified Solera glazing U‐factor and solar heat gain coefficient are higher than expected, resulting in less savings Daylighting  The verified daylighting control area is lower than expected in the Art / Music classrooms resulting in less savings.  The verified daylighting control area is higher than expected in the gym, media center, lobby, vestibule, stairs, and commons areas, resulting in more savings. Lighting Control  The commons occupancy sensor control area is lower than expected, resulting in less savings. Occupancy sensors were not found in commons area 112. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 9 Lighting Design  The verified lighting power density (Watt/sf) is higher than expected in the corridor, private office, multi purpose, and serving / kitchen areas and lower than expected in the classroom, art / music, computer classroom, restroom, lobby, conference, gym, library, commons, storage, mechanical/electrical, workroom, vestibule, stairs and team room areas, resulting in variations in savings. Overall this strategy results in more savings. Please see the electrical portion of the report for additional details. Ground Heat Pump  The verified ARI ton‐weighted average EER and COP are higher than expected, resulting in more savings. VFD control of the ground loop pumps has been verified as expected. Total Heat Recovery  The verified sensible heat recovery efficiency is higher than expected. The verified latent heat recovery efficiency is lower than expected. Overall, the verified heat recovery efficiencies are achieving less savings. Further detail about these strategies may be found in the “Individual Strategy Verification Results” section of this Report. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 10 Individual Strategy Verification Results The following table(s) provides the field verification detailed findings for the applicable strategies. In addition, the Appendices have further information and calculations. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 11 Architectural Strategy Verification Results ID Strategy Description Key Design Parameter Verification Review Verification Findings EWC02 R‐20 wall assembly R‐20 R‐23 The verified wall insulation is higher than expected, resulting in more savings. ERC02 R‐25 roof assembly R‐25 R‐27 The verified roof insulation is higher than expected, resulting in more savings. WGB01 Curtainwall glazing ‐ design team provided 0.30 U‐factor COG 0.24 The verified U‐Factor is lower than expected, resulting in more savings. The verified SHGC is lower than expected, resulting in more savings. 0.43 U‐factor Unit 0.37 0.38 SHGC 0.30 0.51 Vis Trans 0.49 WGC01 Solera glazing 0.20 U‐factor COG 0.47 The verified U‐Factor is higher than expected, resulting in less savings. The verified SHGC is higher than expected, resulting in less savings. 0.33 U‐factor Unit 0.61 0.22 SHGC 0.31 0.37 Vis Trans 0.33 MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 12 Electrical Strategy Verification Results ID Strategy Description Key Design Parameter Verification Review Verification Findings DGA02 Dimming Daylighting ‐ Art / Music Classrooms 1,000 Control Area sf 860 The verified control area is lower than expected, resulting in less savings. DGA03 Dimming Daylighting ‐ Gym 1,800 Control Area sf 2,000 The verified control area is higher than expected, resulting in more savings. DGA04 Dimming Daylighting ‐ Media Center 1,800 Control Area sf 2,350 DGA05 Dimming Daylighting ‐ Lobby, Vestibules, Stairs 2,600 Control Area sf 2,900 DGA06 Dimming Daylighting ‐ Commons 200 Control Area sf 300 DGA07 Dimming Daylighting ‐ Multi‐ Purpose 700 Control Area sf 700 The verified control area meets the strategy requirements. LCCL1 Classroom occupancy sensor control 23,500 Control Area sf 23,500 LCAM1 Art/Music Classroom occupancy sensor control 2,300 Control Area sf 2,300 LCCC1 Computer Classroom occupancy sensor control 700 Control Area sf 700 LCCI1 Corridor occupancy sensor control 6,900 Control Area sf 6,900 LCRR1 Restroom occupancy sensor control 2,900 Control Area sf 2,900 LCLO1 Lobby occupancy sensor control 2,500 Control Area sf 2,500 LCPO1 Private office occupancy sensor control 1,300 Control Area sf 1,300 LCCN1 Conference occupancy sensor control 700 Control Area sf 700 LCGY1 Gym occupancy sensor control 7,100 Control Area sf 7,100 LCMC1 Library occupancy sensor control 2,800 Control Area sf 2,800 LCDN1 Multi Purpose occupancy sensor control 2,000 Control Area sf 2,000 LCCM1 Commons occupancy sensor control 2,800 Control Area sf 2,500 The verified control area is lower than expected, resulting in less savings. Occupancy sensors were not found in commons area 112. LCKT1 Serving Kitchen occupancy sensor control 800 Control Area sf 800 The verified control area meets the strategy requirements. LCST1 Storage occupancy sensor control 2,000 Control Area sf 2,000 LCWK1 Workroom occupancy sensor control 800 Control Area sf 800 LCCL4 Classroom banked switching 23,500 Control Area sf 23,500 LCCC4 Computer Classroom banked switching 700 Control Area sf 700 LCGY5 Gym manual dimming 7,100 Control Area sf 7,100 L02BW Building wide 30% lower than 90.1‐2007 0.80 W/sf 0.49 The verified Watts/sq ft is lower than expected, resulting in more savings. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 13 Space Type Lighting Power Density Space Type Baseline lighting power (W/sf) Target lighting power (W/sf) Takeoff Lighting power (W/sf) Classroom 1.40 0.98 0.41 Art/Music Classroom 1.40 0.98 0.74 Computer Classroom 1.40 0.98 0.57 Corridor 0.50 0.35 0.42 Restroom 0.90 0.63 0.62 Lobby 1.30 0.91 0.37 Private office 1.10 0.77 0.79 Conference 1.30 0.91 0.49 Gym 0.90 0.63 0.55 Library 1.33 0.93 0.74 Multi Purpose 0.90 0.63 0.72 Commons 0.90 0.63 0.41 Serving Kitchen 1.20 0.84 1.14 Storage 0.80 0.56 0.52 Mechanical/electrical 1.50 1.05 0.38 Workroom 1.10 0.77 0.76 Vestibule 0.50 0.35 0.29 Stairs 0.50 0.35 0.27 Team Room 1.30 0.91 0.79 Building Average 1.14 0.80 0.49 MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 14 Site Photos Image of gym area lighting Image of typical classroom area lighting MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 15 Mechanical Strategy Verification Results ID Strategy Description Key Design Parameter Verification Review Verification Findings MGH03 2‐stage ground heat pumps ‐ Alternate 2 w/VFD 21.0 EER 4.00 COP VFD Controlled Ground Loop Pumps 23.2 EER 4.04 COP VFD Controlled Ground Loop Pumps The verified heating and cooling efficiencies are higher than expected, resulting in more savings. VFD control of the ground loop pumps has been verified as expected. MOA04 Transfer air: classrooms to restrooms Transfer make up air Yes Transfer air has been verified as expected. MOA05 Transfer air: offices to restrooms Transfer make up air Yes Transfer air has been verified as expected. MOA09 Low wall classroom return VE 1.0 Yes Low wall return air grills have been verified as expected. MOA02 CO2 control of OA ‐ media center, gym, multi‐purpose Reset OA Control Type Yes CO2 control of outside air has been verified as expected. MOA03 Transfer air: multi‐purpose to kitchen Transfer make up air Yes Transfer air has been verified as expected. MHRT1 Total heat recovery ‐ Alt 1 65% Sensible 65% latent Efficiency ratio 74% Sensible 59% Latent The verified sensible heat recovery efficiency is higher than expected. The verified latent efficiency is lower than expected. Overall, the verified heat recovery is achieving less savings. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 16 Site Photos Image of typical energy recovery unit Image of water to water heat pumps MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 17 Summary of Results Tables 2 and 3 provide summarized and updated field‐verified energy savings projections for this new building. Table 2. “As Verified” energy savings and energy cost savings Energy Parameter Baseline*Bundle 2, As Modeled* Bundle 2, As Verified Energy Cost $118,774 $50,827 $47,698 Energy Cost Savings $67,947 $71,076 Percent Energy Cost Savings 57%60% Electricity Demand 435 kW 224 kW 222 kW Electricity Demand Savings 211 kW 213 kW Percent Electricity Demand Savings 49%49% Electricity Consumption 1,469,798 kWh 605,599 kWh 572,000 kWh Electricity Consumption Savings 864,199 kWh 897,798 kWh Percent Electricity Consumption Savings 59%61% Natural Gas Demand 00 therms/day 00 therms/day 00 therms/day Natural Gas Demand Savings 00 therms/day 00 therms/day Percent Natural Gas Demand Savings 0%0% Natural Gas Consumption 0 therms 0 therms 0 therms Natural Gas Consumption Savings 0 therms 0 therms Percent Natural Gas Consumption Savings 0%0% Incremental First Cost $416,984 $416,984 MidAmerican Energy Company Electric Incentive $163,334 $170,582 MidAmerican Energy Company Gas Incentive $0 $0 Final MidAmerican Energy Company Incentive**$163,334 $170,582 * The figures in the 'Baseline' and 'Bundle 2, As Modeled' are reprinted from the April 10, 2014 Design Assistance Bundle Report for this project, which were the basis for the original energy savings projections. ** Commercial New Construction cannot reduce the simple payback below one year; MidAmerican Energy's Commercial New Construction incentive may not exceed 70% of the total bundled incremental strategy costs, and are capped at $1 million per building. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 18 Table 3. “As Verified” energy use intensity savings Energy Parameter Baseline*Bundle 2, As Modeled* Bundle 2, As Verified Building Results Energy Use Intensity (EUI) 76.3 kBtu/sqft 31.4 kBtu/sqft 29.7 kBtu/sqft EUI Savings 44.9 kBtu/sqft 46.6 kBtu/sqft Percent EUI Savings 59%61% MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 19 Simple Payback Analysis Table 4 shows the calculated simple payback for these energy investments with the included MidAmerican Energy Company incentive. The table also provides payback analysis of the As‐Verified Bundle 2. Table 4. Bundle Simple Payback Analysis Incremental Construction Cost Final Total Incentive Adjusted Incremental Cost Energy Savings vs. Baseline Payback w/ Incentive Bundle 2 $416,984 $170,582 $246,402 $71,076 3.5 The simple payback analysis shows that the MidAmerican Energy Company incentive has helped reduce the incremental costs associated with the energy conservation strategy investments in this building, resulting in a payback of 3.5 years. Note: Subject to the following qualifications, the computer model offers sophisticated predictions of energy savings with estimations as good as any other means available for a building that has not been built. The baseline and as‐verified results compare relative differences in net energy use for design alternatives. The actual energy use of this building will be different from simulated results. Building systems and other operating parameters provided by the Design Team and modeled through this program approximate actual conditions, but differences in weather, operating parameters, occupancy level, and changes that occur through the bidding and construction process will result in annual energy costs that will be different from what is predicted here. Thus, implementation of a bundle of strategies offers the opportunity for energy savings, but the realization of those savings is the responsibility of the owner/operator of the building‐ not The Weidt Group or MidAmerican Energy Company. Savings are not guaranteed. MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 20 Building Summary Building Summary Building type Elementary School Location Corner of Sycamore Street and Daniel Place, Iowa City, Iowa Building area 65,757 sq ft Number of stories Grades 1‐6 will be a 2‐story wing. Other areas are 1‐story. Building structure Concrete block, roof is steel deck with insulation above. Building organization South wing is education with grades pre‐k to 6th. North wing contains library, gym, art, music and multi‐purpose space. Building operation hours Weekdays: 7:30 am to 5:00 pm for classroom areas, gym until 10 pm Weekends: Classroom areas are unoccupied, gym used heavily Summer: Classroom areas unoccupied, gym and admin used heavily Summer is from June 1 to August 1. Glazing systems Considering either 6" curtainwall or possibly store front glazing in the punched openings as an alternate. Lighting system(s) Mix of fluorescent and LED lighting. Occupancy sensors used throughout. Daylighting controls are being considered for multi‐purpose, media center, commons and main lobby. HVAC system(s) Horizontal well field coupled to water to air heat pumps, 1 per thermal zone. Dedicated outside air units serving the building with total energy recovery and water to water heat pumps. Considering radiant floor heat in some areas. Service hot water system is electric tank style water heaters. Areas heated All Areas cooled All Electric utility MidAmerican Energy Gas utility MidAmerican Energy Approx. construction document completion date April 2014 Approx. construction start May 2014 Approx. occupancy date June 2014 MidAmerican Energy ICCSD New South Elementary School, Iowa City, Iowa Commercial New Construction program © THE WEIDT GROUP Verification Report December 04, 2015 Privileged and Confidential 21 Category Summary Category Description Strategies Annual Energy Cost Savings ($) Annual Total Electric Consumption Savings (kWh) Electric Demand Savings (kW) Annual Natural Gas Consumption Savings (Therms) Electric Incremental Cost ($) Natural Gas Incremental Cost ($) Envelope Insulation Strategies EWC02, ERC02 $4,318 57,213 0 0 $77,720 $0 Window Glazing Strategies WGB01, WGC01 $5,452 66,793 49 0 $6,865 $0 Daylighting Control Strategies DGA02, DGA03, DGA04, DGA05, DGA06, DGA07 $1,294 13,672 0 0 $9,930 $0 Lighting Control Strategies LCCL1, LCAM1, LCCC1, LCCI1, LCRR1, LCLO1, LCPO1, LCCN1, LCGY1, LCMC1, LCDN1, LCCM1, LCKT1, LCST1, LCWK1, LCCL4, LCCC4, LCGY5 $2,695 28,278 3 0 $18,969 $0 Lighting Design Strategies L02BW $5,357 58,697 6 0 $0 $0 Heat Pump Efficiency Strategies MGH03 $37,930 489,452 168 0 $312,500 $0 Alternative HVAC System Strategies MFD00, MOA04, MOA05, MOA09 $1,266 15,884 1 0 ‐$32,000 $0 Conditioning of Outside Air Strategies MOA02, MOA03, MHRT1 $12,764 167,809 ‐14 0 $23,000 $0 Total As Verified Bundle Savings $71,076 897,798 213 0 $416,984 $0