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2011-05-04 PACKET 04.D.
REQUEST OF CITY COUNCIL ACTION COUNCIL AGENDA MEETING ITEM # DATE 5/4/2011 PREPARED BY Administration Ryan Schroeder ORIGINATING DEPARTMENT DEPARTMENT HEAD COUNCIL ACTION REQUEST Consider approving Public Safety /City Hall sustainability features. STAFF RECOMMENDATION Approve Public Safety /City Hall sustainability features. SUPPORTING DOCUMENTS ® MEMO /LETTER: Memo from Ryan Schroeder. ❑ RESOLUTION: ❑ ORDINANCE: ❑ ENGINEERING RECOMMENDATION: ❑ LEGAL RECOMMENDATION: ❑ OTHER: Attachments. ADMINISTRATORS COMMENTS City Administrator Date COUNCIL ACTION TAKEN: ❑ APPROVED ❑ DENIED ❑ OTHER Document2 City of Cotta Grove Minnesota To: Honorable Mayor and City Council Members From: Ryan R. Schroeder, City Administrator Date: April 27, 2011 Subject: PSCH Sustainability Features On September 1, 2010 the City requested assistance from Xcel Energy under its Energy Design Assistance program to evaluate sustainability features within the proposed PSCH project. That application was approved by Xcel on October 6, 2010. The project consultant, The Weidt Group, commenced the project on February 23, 2011. Initial strategies were developed on April 7. Bundles creating proposed energy improvements were developed on April 21. The Environmental Commission received a presentation from Wold on sustainable options with a review of LEED requirements and issues on February 9, 2011. On March 9 a subcommittee of the Commission presented a list of questions to the Commission to seek additional information related to sustainable options for the building. On April 13 Wold reviewed information related to the building design and sustainable practices with the Commission. Wold also reviewed the LEED checklist for scoring and addressed questions presented by the subcommittee. The Commission held a special meeting on April 21, 2011 to provide a recommendation to Council. Xcel provides grants to assist building owners with enhancing sustainability within their projects. For the PSCH project we have enclosed the energy analysis which depicts estimated construction cost, estimated Xcel rebate and estimated payback period for each of the bundle choices. It is interesting to note that the Xcel rebates amount to 54.47% of estimated construction costs if bundle one is chosen. For bundle two, due to increased project costs the rebate drops to 31.76% of costs with a further drop to 22.33% of costs for bundle three and 15.78% of bundle four. Environmental Commission Recommendation The Environmental Commission is recommending proceeding under Bundle two with the following upgrades: 1. WGF01/ Lo E tint five windows /argon 2. DGA02/ Private office dimming /day lighting 3. DGA10/ Break room dimming /day lighting 4. LCGA2/ Garage occupancy sensor control to 1/3 level 5. PLG03/ Occupancy sensor control of office equipment (contingent upon Project Team Review Wold represented that Bundle one is presently included within the construction estimating. Therefore, the total construction cost upgrade of Bundle two with the above embellishments is estimated at approximately $99,000. Toward that cost it is estimated that Xcel would contribute a rebate of approximately $51,000 for a net construction estimate of $48,000. The payback in energy savings beyond that of bundle one (already in the project cost) is estimated at less than two years. Council Action: By motion authorize staff to submit the application for rebate to Xcel Energy based upon implementation of Bundle two as amended. Energy Design Assistance xcet Energy°° ENERGY ANALYSIS for Cottage Grove Public Safety /City Hall cottage Grove, MN second of three reports April 21, 2011 7326.0021 THE WEIDT GROUP "" }"„ { 5.00 BAKER ROAD, 6IJITE 100 MINNETONKA, MINNEBOTA 55345 M TEL 952.938.15BB FAX 952.938.1 480 TW GI.CDM Table of Contents Introduction... — . .......... ........ ............................... .......... ............... TheAnalysis .................................................... ............................... BundleResults ................................................. ............................... Xcel Energy Incentive ...................................... ............................... Verification...................................................... ............................... Appendix A. Building Summary ..................... ............................... Appendix B. Detailed Bundle Results ............. ............................... Appendix C. Bundle Lighting Power ............... ............................... Appendix D. Verification Flowchart ............... ............................... Appendix E. Sample Measurement and Verification Plan.. ........... Appendix F. Key Strategy Documentation Guidelines ................... Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIDT GROUP P. 'I Project Participants Design Team Owner.......................... ............................... ...........................City of Cottage Grove Ryan Schroeder Architect.. ......................................... ..................... Wold Architects and Engineers John McNamara .Jodi Nelson Mechanical Engineer .............. ............................... Wold Architects and Engineers Ryan Charlton Pat Jansen Electrical Engineerr ................. ............................_.. Wold Architects and Engineers Paul Juntilla Energy Design Assistance Team Electric and Gas Utility...._ ................................... ............................... Xcel Energy Energy Design Assistance Consultant ....... Verification Consultant Xcel Energy Energy Design Assistance April 21, 2011 Jennifer Abbott Jessica Peterson Nick Worm . .._ .........................The Weidt Group Jim Douglas Mandy Redfield ....... --- ......... ..........................._The Weidt Group Cottage Grove Public Safety /City Hall, Cottage Grove, MN Bundle Report © THE WEIDT GROUP P.2 Introduction This document is the second of three formal reports provided under the Energy Design Assistance program of Xcel Energy. It summarizes bundled strategy results based on final DOE -2.2 simulations of the bundles selected in the April 7, 2011 Strategy Results Meeting. This report also discusses the proposed Xcel Energy incentives and the next steps in the process. For further information about the process, model assumptions, and strategy results, please refer to the Strategy Report dated April 7, 2011. This represents the end of the design stage component of Energy Design Assistance. Following review of this report, the Owner /Design Team will select a bundle for implementation and the Verification process will begin. The process follows a clear methodology of information gathering, collaboration, and analysis in an integrated setting of three format meetings. The Owner, Architect, engineers, cost estimators, utility representatives, and The Weidt Group work together to understand how the building will use energy and where cost effective savings can be realized, through design. These are the steps, with the current stage shown in bold: 1. Introductory meeting • Program overview • Review building design • Review strategies for modeling 2. Phase I analysis Computer modeling of Code Base and strategies by The Weidt Group Cost analysis by the Design'Feam 3. Strategy results meeting • Review of individual strategy results • Selection of bundles of strategies 4. Phase 2 analysis • Bundle energy analysis by The Weidt Group • Further cost analysis by the Design Team (if needed) 5. Bundle results meeting • Review of bundle results • Review of program incentives • Introduction to verification 6. Verification • Bundle selection Construction document review On -site verification of strategies Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIOT GROUP P.3 The Analysis Changes to the Model The following changes were made to the model as a result of discussions during the Strategy Meeting, as well as further discussion with the Design Team following the meeting: • Open office occupancy sensor control was added as a strategy. • Conference room lighting control strategies were refined; multi -scene and occupancy sensor control now applies only to the large conference room (just north of the main lobby) and dual level switching applies to all other conference rooms. • Air- cooled chiller efficiency for strategy MACO2 was modified based on new information from the Design Team; the strategy goal was 1.07 kW /ton and is now 1.17 kW /ton. • Total heat recovery was modified based on new information from the Design Team; the exhaust air volume for each air handling unit with heat recovery has been reduced. • Kalwall skylight construction cost was revised based on new discussion with the Design Team. Bundle Modeling Upon review of the results of the isolated strategy analysis, the Design Team created four bundles of strategies for final modeling. Bundle I is the minimum budget building; Bundle 2 is generally the desired building, given the budget; Bundle 3 is a better building with reasonable payback for conservation strategies; and Bundle 4 illustrates the maximum opportunity for savings regardless of payback. • Bundle I includes a number of strategies that improve the building beyond the baseline level: Upgrade to R -14 total wall assembly Upgrade to R -24 total roof assembly • Lo E tinted air -filled glazing in thermally- broken aluminum frame (Unit U- Factor 0.44, COG U- Factor 0.3 1, Solar Heat Gain Coefficient 0.33, Visible Transmittance 0.24) • Kalwall skylights (Unit U- Factor 0.23, COG U- Factor 0. 18, Solar Heat Gain Coefficient 0.23, Visible Transmittance 0.20) • Stepped daylighting controls in open office and lobby spaces Occupancy sensor control of lighting in private offices (4,806 sf), restrooms (1,987 sf) and data center spaces (263 sf) • Occupancy sensor control to 1/3 level in the serving kitchen (234 sf) • Multi -scene and occupancy sensor control in Council Chambers (1,424 sf) • Manual dimming in training room (1,629 sf) • Dual level switching of lights in fitness (843 sf) • Building -wide weighted average lighting power density (W /sf) 5% better than ASHRAF 90.1 -2004 (0.88 W /st); refer to Appendix C for space by space lighting power densities • Energy Star refrigerators Air- cooled DX cooling, 26% increased efficiency (1134 EER) Condensing gas boiler at 95% efficiency • Premium efficiency supply /return fan and pump motors • Variable frequency drive on the heating pump • Carbon dioxide control of outside air • Carbon monoxide control of garage ventilation fans Service hot water at 95% efficiency • Low flow showerheads Xcel Energy Cottage Grove Public Safety /City Hail, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIDT GROUP P.4 Bundle 2 adds or modifies the following strategies, compared to Bundle 1: • Upgrade to R -30 total roof assembly Upgrade to Lo E tinted argon -filled glazing in thermally- broken aluminum frame (Unit U- Factor 0.39, COG U- Factor 0.26, Solar Heat Gain Coefficient 0.37, Visible Transmittance 0.44) Stepped daylighting controls in private offices, breakroom and fitness • Upgrade to dimming daylighting controls in open office and lobby spaces Dual level occupancy sensor control of lighting in private offices (4,806 sf) and fitness (843 sf; in place of dual level switching) Occupancy sensor control in open office (13,882 st) and storage (5,917 sf) • Occupancy sensor control to 1/3 level in locker rooms & showers (2,448 sf) Upgrade to multi -scene and occupancy sensor control in training room (1,629 sf, in place of manual dimming) and large conference room (525 sf) Dual level switching in all other conference rooms (2,225 sf) and laboratories (858 sf) Occupancy sensor control of VAV boxes and outside air damper Sensible heat recovery on garage air handling unit (60% effective) Bundle 3 adds or modifies the following strategies, compared to Bundle 2: Upgrade to R -18 total wall assembly • Upgrade to Lo E tinted argon -filled glazing in thermally- broken aluminum frame (Unit U- Factor 0.36, COG U- Factor 0.23, Solar Heat Gain Coefficient 0.28, Visible Transmittance 0.41) Upgrade to dimming daylighting controls in private offices and breakroom Change to building-wide weighted average lighting power density (W /sf) 10% better than ASHRAE 90.1 -2004 (0.84 W /sf); refer to Appendix C for space by space lighting power densities Replace DX cooling with air - cooled chiller, 9% increased efficiency (1.17 kW /ton or lower) Variable frequency drive on chilled water pump Occupancy sensor control of office equipment • Bundle 4 adds or modifies the following strategies, compared to Bundle 3: Upgrade to R -40 roof total assembly Upgrade to dimming daylighting controls in fitness Occupancy sensor control to 1/3 level in corridor, garage and lobby spaces • Change to building -wide weighted average lighting power density (W /sf) 15% better than ASHRAE 90.1 -2004 (0.79 W /st); refer to Appendix C for space by space lighting power densities • Vending machine occupancy sensor control • Total heat recovery on main building air handling units (70% effective, both sensible and latent) Please see the previous Strategy Report (dated April 7, 2011), which provides additional information associated with each of these strategies. Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIOT GROUP P.5 Bundle Results The simulation results for the bundles are shown below. Figure 1 shows that the bundles are projected to save between $50,700 and $63,600 per year beyond the Baseline base energy use. The bundles show substantial savings in most categories. More detailed results can be found in Appendix B. Detailed Bundle Results. Figure 1 Annual Energy Costs for Bundles by End Use Baseline Bundle 1 Bundle 2 Bundle 3 Bundle 4 ■Heating 0Cooling 0Fan /pump 0Lights 0Equip. EDDHW Total A N Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 O THE WEIDT GROUP P.6 Figures 2 and 3 show electric peak and consumption savings respectively. Figure 4 shows the annual total energy use. The peak kW values and annual energy use values are especially important because they are the primary basis for the incentives from Xcel Energy. Figure 2 Annual Electrical Peak, KW Baseline Bundle 1 Bundle 2 Bundle 3 Bundle 4 Figure 3 Annual Electric Use, KWH Baseline Bundle 1 Bundle 2 Bundle 3 Bundle 4 0% 20% 40% 60% Figure 4 Annual Total Energy Use, BTU x 10' (includes both gas and electric) Baseline Bundle 1 Bundle 2 Bundle 3 Bundle 4 80% 100% Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIDT GROUP P.7 0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% Bundle Composition and Strategy Paybacks In order to make informed design choices based on energy use, it is important to weigh the cost of design options against the potential for energy savings. One useful gauge of first cost versus annual savings is the simple payback, which is the ratio of first cost to annual savings. This represents the number of years required for the energy savings to pay for the improvements. The Design Team assembled incremental construction costs for all strategies considered in the bundle analysis. The costs and paybacks for isolated strategies are listed below. Annual Savings Peak Gas Energy Construct Payback Baseline wall ERC01 R-24 met assembiv 5 2110 WGA01 Baseline'. 10tr20%evorsallrattr 0 0 wceoi it Ecoi t, airmldJm 6an 5 1130 wcc91 L. E um z, awmmpm name e Szo wGD91 Le Etat 3 bob al,ablo 1 t ce_ewmrnrn Gem, a 1220 CRA03 (goon shoo Conference dmmino aavlohhne i 39 DGA09 Breakroom - ^.0 23.] 539,89] 1 DGA13 Training Room strategic f,utrung 1 -20 $81 $400 DGA14 Fnaeod stepped daylight, 0 =0 $55 $310 OGA15 F'Mess tllmming dayGghtin9 1 -20 $89 $620 LCP01 on Royale ofiml owupan, fervor control 1 -90 $330 $1,430 LCP03 Private office daallevel ocapaacy sensor mntrcl 2 -110 $407 $1859 LCPO4 Pn to oR¢e dual level alwtLhng 1 30 $170 $1,826 ,arse. crones 0 450 $525 $2.]]8 53 LCCN5 Conference manual dimming 3 -10 $144 $2,345 16.3 LGGNB Coofrence MUl &steno and ocwpanry sensor wnlrol 9 20 $15 5106 7.0 LCC12 C ripe occupancy sensor control to 1l31eve1 0 0 $11 5656 599 LC LC2 lobby occupancy sensor crnlrol to 1/3 level 0 -10 527 S672 24 9 LCDN4 greenroom dual level toissung 0 0 $9 $91 10.1 LGONa greenroom Multi-scene antl oaupency sensor control 0 0 $16 $120 ].5 LCCL4 Training ROOM dual level swltcMng 0 10 537 $413 112 LCCL5 Trarring ROOM manual Nmming 1 -20 $82 $1,132 13.8 LCCL6 Training Room Mmi-or.m. one occupant' lauccr control 1 -40 S108 S435 4.0 LCFT1 Fitness soon panty s error.,tr. 0 0 $!9 $169 8.9 LCF73 Fl ,dual level roc p ysensor wntml 0 -10 $25 $242 99 LCFT4 Fivesc oral level swncnm9 0 10 $40 - $1'S 2.9 LO..R2 Laker Room &Shorn c sensar,,mbrl to 1/3 level 0 -20 $49 $490 1 0.0 LCKT2 Strung Kitchen acm,ar, an,orcontrol to l /3 level 0 0 $29 $47 1.6 LCCG5 Conoul Chambers rrznualtlmmng 1 10 $82 $787 9.6 LCCGa _.._ Counsel Chambers Multi fee. and occ seosorcrntrol 1 _. -40 $116 $380 3.3 LC 24 Labroduy du3levei smibMng 0 0 574 $2 2.9 LC3T1 St ge raoupancy sensor coniml 1 -70 §174 $1,663 0.6 LCRRI R corn occupancy sensorcnnarl 1 70 $131 $429 3.3 LCGA2 Garage owuoana sonsorcontral 10 1/3 dell 1 0 $291 34A02 13.8 Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 ©THE WEIDT GROUP P.$ Bundle Composition and Strategy Paybacks (continued) Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIDT GROUP P.9 Xcel Energy Incentive Xcel Energy promotes the implementation of cost effective bundles of strategies by proposing cash incentives to reduce the added cost of implementing the selected energy conserving strategies. The bundles discussed on the previous pages were selected by the designers to cover a range of scenarios so that one of these bundles would be a likely candidate for implementation in the final building. Xcel Energy is offering incentives as follows for the bundles. Bundle l: $44,195 Bundle 2: $50,340 Bundle 3: $51,555 Bundle 4: $55,340 The incentive offers listed above make the presumption that the selected bundle will be implemented in its entirety. Any changes from the specifications of the selected bundle should be reported to Xcel Energy. If it is deemed that these changes would have a significant impact on energy, then Xcel Energy will make adjustments to the incentives accordingly. Bundle Payback Analysis The Xcel Energy incentive will reduce the paybacks for each of the bundles, as shown in the table below. Node: Subject to the following qualifications, the Energy Design Assistance 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 strategy and bundle results compare relative drJJerences in net energy use for design alternatives. The results are not appropriate for system design and /or equipment selection; these are responsibilities of the registered design professionals of record The actual energy use of this building will be different jronv simulated resins. Building systems and other operating parameters provided by the Design Team and modeled through Energy Design Assistance 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 dijerera from what is predicted here. However, when a bundle at is selected relative to other alternatives, its energy (and dollar) conserving value can be expected to remain constant relative to the other alternatives, and the magnitude of the cost should be app ^oxinzoady as predicted. Thus, implementation of a bundle of strategies offers the opporlanity for energy savings, but the realization of those savings is the responsibiliov of the owner /operator of the building- notXcel Energy or The Weidt Group. Savings are not guaronteed Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 (eJ THE WEIDT GROUP P.10 Incremental Annual Payback Total Adjusted Payback Construction Energy Before Construction After Cost Savings Incentive Incentive Costs Incentive ea rs ears Bundle 1 $81,133 $50,735 1.6 $44,195 $36,938 0.7 Bundle $158,519 $57,632 2.8 $50,340 $108,179 1.9 Bundle $230,912 $61,454 3.8 $51,555 $179,357 2.9 Bundle 1 $350,674 $63,597 5.5 1 $55,340 $295,334 4.6 Node: Subject to the following qualifications, the Energy Design Assistance 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 strategy and bundle results compare relative drJJerences in net energy use for design alternatives. The results are not appropriate for system design and /or equipment selection; these are responsibilities of the registered design professionals of record The actual energy use of this building will be different jronv simulated resins. Building systems and other operating parameters provided by the Design Team and modeled through Energy Design Assistance 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 dijerera from what is predicted here. However, when a bundle at is selected relative to other alternatives, its energy (and dollar) conserving value can be expected to remain constant relative to the other alternatives, and the magnitude of the cost should be app ^oxinzoady as predicted. Thus, implementation of a bundle of strategies offers the opporlanity for energy savings, but the realization of those savings is the responsibiliov of the owner /operator of the building- notXcel Energy or The Weidt Group. Savings are not guaronteed Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 (eJ THE WEIDT GROUP P.10 Verification This marks the end of the Design Assistance portion of Energy Design Assistance. The next stage will be Verification /Validation, a process that seeks to assure that one of the bundles is implemented and working properly. The Weidt Group will work with the Design Team until the building is constructed and occupied, serving as a resource to verify that the accepted measures are installed. The process will be laid out in detail in the coming weeks, but it will generally include the following. Design Team provides written notification to Xcel Energy of acceptance of one bundle as defined in this Report Execution of rider to Xcel Energy contract defining remaining responsibilities and procedures Construction document review by The Weidt Group Field observation of installed strategies as the building is completed and occupied Report by The Weidt Group as to status of strategy implementation Xcel Energy provides incentive payment The Verification /Validation process, while not exhaustive by any means, is designed to assist the Owner in knowing whether or not the strategies are working as expected. If strategies are not working, notification is given so that corrections can be made. If some of the chosen strategies are not implemented within the Owner's selected bundle, Xcel Energy may choose to adjust the incentive amount. Please see Appendix D. Verification Flowchart for more details Distribution of Program Results Xcel Energy, through the Energy Design Assistance program, contracts with energy consultants to provide our customers with a service that includes an integrated design process. This integration includes using an energy model to predict energy savings. The energy model itself is an instrument to project results and r ^evietm different energy effietency opportunities. The results of these models belong to Xcel Energy and their customers as participants through the Energy Design Assistance program. The Instrument itself is proprietary to individual consultants and will not be provided as part of the Energy Design Assistance program. participants of the Energy Design Assistance program may distribute the results of their model to anyone they choose. However, Xcel Energy will not release this information unless written permission from the customer has been obtained As a result of this permission, up to two reports will be provided. Xcel Energy also cautions the use of these reports; data is based on an analysis done for a specific time frame. Buildings naturally adjust as occupancy reaches its full potential, causing variations from pre - construction data. Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIDT GROUP P.11 Appendix A. Building Summary Building Summary Building type Public Safety / City Hall Location Cottage Grove, Minnesota Building area 70,400 sq ft, including garage Garage area 20,000 sq ft Number of stories 2 Building Structure Masonry with face brick exterior Building organization Upper level: City hall, public safety, training /meeting rooms and fitness. Lower level: Booking /detention, evidence, mechanical space and parking garage. Windows Upper level: Punched windows typical with some curtainwall and clerestory. Lower level: No glazing. Lighting system(s) Direct/indirect linear fluorescent T8s typical throughout - may be suspended. Specialty lighting in lobby and Council Chambers. Daylighting and occupancy sensors to be incorporated where applicable. HVAC system(s) 3 central VAV AHUs with DX cooling, hot water heating and energy recovery High efficiency condensing gas boiler VAV boxes with hot water reheat; finned tube radiation for perimeter spaces MAU for garage with energy recovery; separate MAU for Sallyport Considering chiller /boiler and ground source heat pump options Areas heated All (garage temperature setpoint approximately 50 °F) Areas cooled All except garage Electric utility Xcel Energy Gas utility Xcel Energy Approx. construction document June 30, 2011 completion date Approx. construction start September 2011 Approx. occupancy date September 1, 2012 Other notes Some areas of building operate 24/7 Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIOT GROUP P.12 Appendix B. Detailed Bundle Results Ener by End Use Itemized KBtu /sf Itemized Costs Totals per sq.ft Totals for Buildin Cooling Heating Cooling p DH Lights Equip Total Gas /0 Annual M $ /sf $ /sf KBtu /sf $sf $ /sf $ /sf $ /sf /yr Savings Savings Energy Savings 6.4 133.72 $ /sf 41.9 3.5 4.6 $ /sf 7.2 64 64.31 Baseline $306 $.126 $.306 $.012 $.215 $.159 $1.62 6.4 5405 $114,412 Bundle 3 Bundle 1 $.346 $.089 1 $.117 $.006 $.184 $162 $.90 $0.72 44.3% $63,677 $50,735 Bundle 2 $269 $,100 $.131 $.006 $140 $.160 $.81 $0.82 50.4% $56,780 $57,632 Bundle $269 1 $,062 1 $.138 $.006 $,134 $142 $.75 $0.87 517% $52,958 $61,454 Bundle 4 $250 $.059 $.147 $,006 $.120 $.139 $.72 $0.90 55.6% $50,815 $63,597 Annual Energy by End Use Itemized KBtu /sf Totals Cooling Heating Cooling Fan /Pump DHW Lights Equip Total Savings Gas M Savings W /sf KBtu /sf KW Baseline 99.8 5.0 12.3 1.5 8.6 6.4 133.72 Bundle 1 41.9 3.5 4.6 0.8 7.2 64 64.31 52% Bundle 2 32.2 4.0 5.2 0.8 5.6 6.4 5405 60% Bundle 3 32.2 2.4 5.4 0.8 5.2 5.6 51.50 61% Bundle 4 29.3 1 233 1 5.8 1 0.8 1 4.7 1 5.5 1 48.42 64% Peak Conditions Energy by Fuel Source Peak Electric Cooling Heati ng U Gas M Savings W /sf KW KW %KW Cooling Cooling Savings Possible % Heating Savings Possible % Savings Savings Savings sffton tons 9,420 downsize KBTU /H 669,306 downsize Baseline 3.4 241 Bundle 1 636 111 52% 455,214 3,452 32% 2,978 Bundle 2.3 162 78 33% 893 79 32 29% 2,273 1,179 34% Bundle 2 2.2 154 87 36% 903 78 33 30% 1,530 1,922 56% Bundle 3 21 150 91 38% 958 74 37 34% 1,516 1,935 56% Bundle 4 20 140 100 42% 1,085 65 46 41% 1,360 2,092 61% Annual Energy by Fuel Source Annual Energy Annual Electric Annual Gas U Gas M Savings % KWH Savings % Gas MMBTU %Gas electric) Savings Savings MMBTU Savings Savings Baseline 9,420 669,306 7,137 Bundle 1 4,531 4,889 52% 455,214 214,092 32% 2,978 4,159 58% Bundle 3,808 5,613 60% 445,122 224,184 33% 2,289 4,848 68% Bundle 3 3,628 5,792 61% 393,577 275,729 41% 2,286 4,851 68% Bu nd� 4 3 411 6, 009 64% 1 393,376 275,930 41% 2,069 5,068 1 71 Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 U THE WEIDT GROUP P.13 Appendix C. Bundle Lighting Power Densities, Watts per sf Space Type Baseline Bundle 1 Bundle 2'.Bundle 3 Bundle4 Private office 1.45 1.38 1.38 1.31 1.23 Open office 1.45 1.38 1.38 1.31 1.23 Conference 1.30 1.24 1.24 1.17 1.11 Corridor 0.50 0.48 0.48 0.45 0.43 Lobby 1.30 1 1.24 124 1.17 1 1.11 Breakroom 0.90 0.86 0.86 0.81 0.77 Training Room 1.40 1.33 1.33 1.26 1.19 Fitness 0.90 0.86 0.86 0.81 0.77 Locker Room & Shower 0.60 0.57 0.57 0.54 0.51 Serving Kitchen 1.20 1.14 1.14 1.08 1.02 Council Chambers 1.90 1.81 1.81 1.71 1.62 Confinement Cell 0.90 0.861 0.86 0.81 0.77 Laboratory 1.40 1.33 1.33 1.26 1.19 Storage 0.80 0.76 016 0.72 0.68 M ech /elec 1.50 1.43 1.43 1.35 1.28 Restroom 0.90 0.86 0.86 0.81 0.77 Garage 0.20 0.19 0.19 0.18 0.17 Data center 1.45 1.38 138 1.31 1.23 I Building Average 1 0.93 1 0.88 0.88 0.84 0.79 Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE wEIOT GROUP P. 14 Appendix D. Verification Flowchart Owner / Design Team Xcel Energy/ Enemy Design Assistance Team Bundle Selection Owner/ Design Team form select one bundle sentto Xcel Enemy Xcel Energy issues an Incentive Rider and notifies The WeidtGroup to begin Verification activities The WeidtGroup sends Bundle Requirements to the Design Team Design team sends Documents Construction Documents to The WeidtGroup for review CDReview memo (also The WeidtGroup assembly sentto Xcel CDReviewmemofor Energy) Design Team, Owner, and _ XcelEnergy BUILDING /RENOVATION WORK COMPLETE AND OCCUPIED.. The WeidtGroup requests s u bmitta Is /manufacturer's information provides field review of in strategies The WeidtGroup completes field reviewof installed strategies Verification The WeidtGroup writes a Report strategy Verification Repo. forthe Owner, Design Tear and Xcel Energy Ownerreceives �, I Xcel Energy issues Incentive Payment Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 n THE VvEIDT GROUP P.15 Appendix E. Sample Measurement and Verification Plan The following details the Measurement and Verification Plan for the different strategy categories. Architectural 1. Review Construction Documents for selected energy conservation measures 2. Review construction submittals for selected energy conservation measures Electrical 1. Review Construction Documents for selected controls, fixtures, lamps, ballasts 2. Review construction submittals for selected controls, fixtures, lamps, ballasts 3. After construction completion, visually inspect installed controls, fixtures, lamps, and ballasts 4. After construction completion, functionally test the installed controls, verify response to changes and sensitivity 5. After building occupancy, datalog a sample of lighting circuits to determine performance of lighting controls Mechanical I. Review Construction Documents for selected energy conservation measures 2. Review construction submittals for selected energy conservation measures 3. After construction completion, visually inspect installed energy conservation measures 4. After building occupancy, datalog a sample fan to determine VFD response 5. After building occupancy, use the building energy management system to verify response to CO sensors Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 9 THE WEIDT GROUP P.16 Appendix F. Key Strategy Documentation Guidelines This Appendix lists information that should be in the Construction Documents for several key strategy types in order to ensure that those strategies will be properly implemented. Occupancy Sensors Occupancy B1 Type of occupancy sensor B2 Location of occupancy sensor B3 Sensitivity settings for the sensor B4 Time out settings for the sensor B5 Override controls an how they interact with the system and location • Calibration .- B6 Requirement for on -site calibration by factory- authorized personnel B7 Notification to architect, owner, commissioning agent and lighting designer, 10 days in advance of B11 calibration B8 Requirement for training of owner by manufacturer's authorized representative B9 Requirement for contractor to submit calibration logs as part of construction submittals Contractor B10 Submittal Requirements Product Data Sheets showing the following 1. Occupancy sensor features 2. Dimensions and ratings B11 Drawings that locate the sensor and controller in each zone 1. Specific to the project 2. Sensor cone of vision B12 Wiring diagrams 1. Showing entire installation 2. Specific to the project 3. Overlaid on Reflected Ceiling Plans B13 Compatibility documentation 1. Occupancy sensor 2. Ballast 3. Lamp 4. Fixture 5. Other lighting controls 6. Signal, control wiring, interface, input output, radio frequencies Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIDT GROUP R 17 Daylighting Controls Daylight A.1 Identify the target design illuminance level within each daylight control zone A.2 When the controls would turn off or dim the electric lights A.3 When the controls would turn on or brighten the electric lights A.4 What type of control algorithm is being used (open loop system or closed loop system) A.5 Time delay and fade rate response of the daylighting system to changes in light level A.6 Location of manual override switches A.7 Describe how other lighting controls (i.e. manual overrides) interact with the daylight system • n-site A.8 Calibration Plan Specification Requirement for on -site calibration by manufacturer - authorized personnel A.9 Notify Architect 10 days in advance of calibration site visit A.10 Requirement for training of owner by manufacturer's authorized representative A.11 Requirement for contractor to submit calibration logs as part of construction submittals Contractor A.12 Submittal Requirements Product Data Sheets showing the following 1. Photo sensor features 2. Controller features 3. Dimensions and ratings A.13 Drawings that locate the photo sensor and controller in each zone 1. Specific to the project 2. Plans, interior elevations and sections of each daylighting zone that show the sensor cone of vision A.14 Wiring diagrams 1. Showing entire installation 2. Specific to the project 3. Overlaid on Reflected Ceiling Plans A.15 Compatibility documentation 1. Photo sensor 2. Controller 3. Ballast 4. Lamp 5. Fixture 6. Other lighting controls 7. Signal, control wiring, interface, input output, radio frequencies Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIOT GROUP P, 18 Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIOT GROUP P.19 Condensing Boilers Variable Frequency Drives CO Control of Outside Air The goal of the CO, sensor is to use CO levels as a proxy for occupancy and to reduce outside air levels when CO levels and occupancy are low, as shown in the graph below. CO2 Sensor Control Strategy Concept Design Minimum Outside Ail Operating Minimum Outside Ail -- . ____.. .. ...��_ . . ...._.w . _ I I i i i 0 0.25 0.5 0.75 1 1.25 Percentage of Design Occupancy Xcel Energy Cottage Grove Public Safety /City Hall, Cottage Grove, MN Energy Design Assistance Bundle Report April 21, 2011 © THE WEIDT GROUP P.20 Critical elements Of the CO outside air reset system