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Modeling To Inform Design I NTEGRATED D ESIGN P ROCESS M ODELING P ROCEDURES C ASE S TUDIES IBPSA - USA 1.

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Presentation on theme: "Modeling To Inform Design I NTEGRATED D ESIGN P ROCESS M ODELING P ROCEDURES C ASE S TUDIES IBPSA - USA 1."— Presentation transcript:

1 Modeling To Inform Design I NTEGRATED D ESIGN P ROCESS M ODELING P ROCEDURES C ASE S TUDIES IBPSA - USA 1

2 M ODELING AND THE B UILDING L IFE C YCLE 2

3 IBPSA - USA Performance Impact Time Project Start Project Finish HIGH LOW Level of Effort Typical energy modeling timeframe E ARLY D ECISIONS A RE T HE M OST I MPORTANT 3

4 IBPSA - USA I NTEGRATED D ESIGN P ROCESS T IME C OMPARISON TypicalIntegrated Design Development Construction Documents Schematic Design Construction Admin Project Closeout Pre-design Design Development Construction Documents Schematic Design Construction Admin Pre-design Project Closeout 4

5 IBPSA - USA I NTEGRATED D ESIGN P ROCESS O VERVIEW Align team around energy-related goals Make design recommendations EARLY to increase potential for impact Identify where efforts should be focused to maximize energy savings and equipment downsizing Maximize opportunity for energy efficiency Activities Modeling Objectives 5

6 IBPSA - USA I NTEGRATED D ESIGN P ROCESS G OAL S ETTING Use Energy Modeling to Quantify Targets Goal Setting Charrette 6

7 IBPSA - USA I NTEGRATED D ESIGN P ROCESS T ECHNICAL P OTENTIAL WHAT IS IT?? The minimum level of energy consumption possible for a building, given today’s technology (excluding renewables). HOW DO WE DETERMINE THIS? Start with a baseline or current design Removes the losses and inefficiencies with best available technology WHY DO WE CARE? Challenges conventional ways of thinking Not limited by industry benchmarks/norms Leads to more aggressive design targets Explicitly determines where ground has been lost 7

8 IBPSA - USA I NTEGRATED D ESIGN P ROCESS T HE R IGHT S TEPS I N T HE R IGHT O RDER Most people start here! 8

9 IBPSA - USA I NTEGRATIVE D ESIGN P ROCESS I TERATIVE A NALYSIS P ROCEDURE 9

10 IBPSA - USA I NTEGRATIVE D ESIGN P ROCESS S UPPORTING THE B USINESS C ASE Include all cash flows Identify “business as usual” baseline Packages of measures –Downsize HVAC equipment Identify packages that meet various goals 10

11 IBPSA - USA Evaluate heating and cooling load breakdowns to identify impactful load reduction measures….this is how you can downsize HVAC systems! ** Use “Design Day” Feature Peak Cooling Load ContributionsPotential Cooling Load Reduction I NTEGRATIVE D ESIGN P ROCESS S UPPORTING THE B USINESS C ASE 11

12 IBPSA - USA Show a path to a desired goal – communicate to the owner/architect early on that this is important! I NTEGRATIVE D ESIGN P ROCESS S UPPORTING THE B USINESS C ASE 12

13 Modeling to Inform Design I NTEGRATED D ESIGN C ASE S TUDY : NELHA IBPSA - USA 13

14 IBPSA - USA AIA Top 10 Green Projects-2007 NELHA C ASE S TUDY I NTEGRATED H IGH P ERFORMANCE B UILDING 14

15 IBPSA - USA Regenerative Design Warm Air Cool Air Condensate water for irrigation Warm air Cool waterNELHA 15

16 IBPSA - USA Annual Energy Use: 8.6kBtu/sf Annual Energy Cost Savings: $25,437 Indoor Potable Water Use: 11,700 gal/yr Indoor Potable Water Use Reduction: 73% Outdoor Potable Water Use: Zero LEED NC V2.1 Platinum Date Completed: November 2005 NELHA 16

17 Modeling to Inform Design S UPPORTING T HE B USINESS C ASE C AR D EALERSHIP IBPSA - USA 17

18 IBPSA - USA C AR D EALERSHIP C ASE S TUDY L IFE C YCLE C OST A NALYSIS 18

19 IBPSA - USA Hot & Humid Winter Haven, FL C AR D EALERSHIP C ASE S TUDY E ND U SE B REAKDOWNS Cold Chicago, IL 19

20 IBPSA - USA C AR D EALERSHIP C ASE S TUDY S UMMARY OF R ESULTS IMPACT OF Life Cycle Cost Analysis (LCCA) Forced the dealers to consider metrics beyond SPP Gave “credit” for downsizing HVAC By considering integrated packages of measures, we were able to “finance” measures with non-quantifiable benefits –Improved thermal comfort –Increased sales and worker productivity from daylighting 20

21 Modeling to Inform Design S UPPORTING THE B USINESS C ASE E MPIRE S TATE B UILDING IBPSA - USA 21

22 IBPSA - USA E MPIRE S TATE B UILDING (ESB) A PPLICATION OF T ECHNICAL P OTENTIALwww.esbsustainability.com 22

23 IBPSA - USA ESB P RE -R ETROFIT Prior to 2008, the Empire State Building’s performance was average compared to most U.S. office buildings. Annual utility costs: $11 million ($4/sq. ft.) Annual CO2 emissions: 25,000 metric tons (22 lbs/sq. ft.) Annual energy use: 88 kBtu/sq. ft. Peak electric demand: 9.5 MW (3.8 W/sq. ft. inc. HVAC) 23

24 IBPSA - USA ESB P ROCESS Motivation of ESB Ownership: To demonstrate how to cost- effectively retrofit a large multi-tenant office building to inspire others to embark on whole-building retrofits. 8 24

25 IBPSA - USA Current Energy Use Annual Energy Use 1 What is the maximum level of energy savings for this building given today’s technology? ESB: T ECHNICAL P OTENTIAL E XERCISE 90 kBtu/sf/yr 25

26 IBPSA - USA Current Energy Use Annual Energy Use 1 EEMs 2 What is the maximum level of energy savings for this building given today’s technology? Cooling Energy Use Raise Cooling Setpoint Envelope & OA Savings Reduce Internal Gains Cooling Efficiency Cooling T- Min Existing Cooling 65% Savings ESB: T ECHNICAL P OTENTIAL E XERCISE 90 kBtu/sf/yr 26

27 IBPSA - USA Current Energy Use Annual Energy Use 1 EEMs 2 Technical Potential 3 Constraints 4 Implementable Minimum 5 What is the maximum level of energy savings for this building given today’s technology? 90 kBtu/sf/yr ESB: T ECHNICAL P OTENTIAL E XERCISE 27

28 IBPSA - USA ESB: T ECHNICAL P OTENTIAL E XERCISE Technical Potential: 30 kBtu/sf/yr Baseline: 90 kBtu/sf/yr 67% Savings 29% not cost effective or implementable Implementable Minimum: 57 kBtu/sf/yr 28

29 IBPSA - USA ESB: I MPLEMENTABLE M INIMUM Energy and CO 2 savings result from 8 key projects. 38% Reduction 29

30 IBPSA - USA ESB S UMMARY 30

31 Modeling to Inform Design M ODELING P ROCEDURES IBPSA - USA 31

32 IBPSA - USA M ODELING P ROCEDURES  How is energy modeling best utilized during each phase?  What are the key steps to be followed during each phase? 32

33 IBPSA - USA M ODELING P ROCEDURES P RE -D ESIGN 33

34 IBPSA - USA M ODELING P ROCEDURES P RE -D ESIGN Confirm critical assumptions and big picture analysis Take what you know (footprint, building type, etc) and construct a model Document all assumptions, note values to be validated Evaluate the end-use breakdown to identify major savings opportunities Evaluate peak heating and cooling load contributions to identify ways to downsize mechanical systems Analyze certain measures that are early design decisions and will be difficult to change later Determine the “technical potential” for reduced energy consumption to challenge the actual design 34

35 IBPSA - USA M ODELING P ROCEDURES S CHEMATIC D ESIGN 35

36 IBPSA - USA M ODELING P ROCEDURES S CHEMATIC D ESIGN Review all available documents (Owner’s Requirements, Narratives, Drawings). Extract known data, document assumptions. Compile schedules, LPD, EPD design data for team to review, get info for ASHRAE fan power calculation (filters, sound attenuation, etc.) Evaluate those things that can’t be modeled with alternative methods (e.g. thermodynamic equivalent, spreadsheet, 8760 schedule, etc.) Evaluate impact of change from “reference” to “technical potential” Define several HVAC alternatives Expand EEMs to include synergistic elements Make series of runs that include one EEM at a time to facilitate QC Define packages to cover range of targets Check results against metrics (site, plant, end-use) and targets 36

37 IBPSA - USA M ODELING P ROCEDURES D ESIGN D EVELOPMENT 37

38 IBPSA - USA M ODELING P ROCEDURES D ESIGN D EVELOPMENT Update model input with latest design info, document assumptions Identify any gaps in the plans & specifications (e.g. fenestration properties, fan bhp, sequence of operations, etc.) and request clarifications. For lifecycle cost analysis or value engineering, identify efficiency measures already incorporated into the design, and use parametric cases to show performance without these measures Identify and analyze efficiency measures not analyzed in earlier phases Fine-tune efficiency measures in design control parameters exterior shade depths chiller selection (using part-load curves) Verify equipment capacities will meet comfort conditions without jeopardizing energy efficiency 38

39 IBPSA - USA M ODELING P ROCEDURES C ONSTRUCTION D OCUMENTS 39

40 IBPSA - USA M ODELING P ROCEDURES C ONSTRUCTION D OCUMENTS Check for changes to building form, orientation, or thermal zones Verify envelope input parameters Identify any changes to LPD, EPD, or schedules Identify any changes to fan bhp, air flow, and other HVAC equipment Identify any changes to controls Revise model to reflect current design Check results against DD results, metrics, targets Ensure that documentation appropriately responds to information requested by Authority Having Jurisdiction Provide full justification for all savings claimed Provide a narrative justifying any non-standard inputs or outputs 40

41 IBPSA - USA C ONSTRUCTION D OCUMENTS LEED S UBMITTAL REQUIREMENTS 41

42 Modeling to Inform Design C ONSTRUCTION D OCUMENTS C ASE S TUDY UH C-MORE LAB IBPSA - USA 42

43 IBPSA - USA UH C-MORE C ASE S TUDY C ONSTRUCTION D OCUMENTATION R EVIEWS Goal of CD Reviews: To ensure inclusion of all sustainability measures and LEED points. CD Energy Modeling: Completion of Exceptional Calculation Measures. ASHRAE

44 IBPSA - USA UH C-MORE C ASE S TUDY CD R EVIEW *EAc1 Optimize Energy Performance **IEQc1 Outdoor Air Delivery Monitoring 44

45 IBPSA - USA Energy Savings Operating Cost Savings LEED EAc1 Points Without ECM 29%19%3 With ECM52%31%6 Heat Recovery Schematic UH C-MORE C ASE S TUDY E XCEPTIONAL C ALCULATION M ETHOD 45


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