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Building Energy Modeling

For Optimized Building Performance
by

Jeremiah Crossett

on 25 May 2013

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Transcript of Building Energy Modeling

Building Energy Modeling
~BEM~ WHAT IS ENERGY MODELING? BUILDING ENERGY MODELING IS THE CREATION OF AN ANNUAL HOURLY COMPUTER-BASED BUILDING SIMULATION DEMONSTRATING ENERGY EFFICIENCY AND RENEWABLE ENERGY TECHNOLOGY'S BY COMPARISON BETWEEN A PROPOSED AND BASELINE BUILDING. ALLOWING INDIVIDUAL EE/RE OPTIONS TO BE COMPARED TO EACH OTHER BY ENERGY SAVINGS, COST, FIRST YEARS COST vs FIRST YEARS SAVINGS, AND OVER THE LIFECYCLE OF THE EE/RE MEASURE. TYPICALLY NOT USED FOR ACTUAL ENERGY USAGE PREDICTION
OR CORRECTED TO MATCH ACTUAL HISTORICAL ENERGY USE. THE BASELINE BUILDING LEED PROJECT FEDERAL PROJECT FEDERAL TAX DEDUCTION M&V OPTION D ENERGY AUDUIT BASELINE – ASHRAE 90.1-2007
MIN. 10% FOR NEW, 5% FOR EXISTING BLDG. BASELINE – ASHRAE 90.1-2007 BASELINE – ASHRAE 90.1-2001 BASELINE –CURRENT LOCAL BUILDING CODE
OR BEYOND BUILDING CODE PROJECT PROFORMANCE GOALS BASELINE – CALIBRATED TO
EXISTING BUILDING I AM SORRY. BUT, BENEFITS OF ENERGY MODELING CONCEPTUAL DESIGN SCHEMATIC DESIGN(CD 50%) DESIGN DEVELOPMENT(CD 70%) CONSTRUCTION DOCUMENT(CD100%) BLDG. ORIENTATION
INSULATION
DAYLIGHTING CONTROL
WINDOW(WWR AND SHGC-VALUE) PARAMETRIC RUNS ON FINAL SELECTED
COMPONENTS COMPARISON TO BASELINE BLDG. “Usually, a lot of time is spent in creating the input for a simulation model, but once this is done, the user usually does not determine the parameter values that lead to optimal system performance.” -Michael Wetter
Lawrence Berkeley National Laboratory LIMITATIONS OF PARAMETRIC RUN LET'S ASSUME THAT WE NEED TO FIND OPTIMIZED SET OF BUILDING COMPONENTS WITH
10 TYPES OF GLAZING
10 DIFFERENT R-VALUE OF EXTERIOR WALL INSULATION
10 DIFFERENT R-VALUE OF ROOF INSULATION 10 X 10 X 10 - 1,000 PARAMETRIC RUNS REQUIRED GIVEN THAT 1 MINUTE IS TAKEN PER EACH RUN,
1,000 MINUTE/60 = 16.7 HOURS ONLY FOR CALCULATIONS SOLUTION BUILDING OPTIMIZATION AUTOMATIC PROCESS OPTIMIZE SIMULATION BY LEAST UPFRONT & UTILITY COST, OR BY BUDGET. SAVE TIME AND LABOR SIMPLE MATH: WHAT IF ? 4 DIFFERENT GLAZING TYPES ON EACH SIDE WALL
LCC COST CALCULATIONS ARE ASKED IT IS EASY TO SAY 4 DIFFERENT GLAZING TYPES ON EACH SIDE WALL
LCC COST CALCULATIONS ARE ASKED TAKE ADVANTAGE OF ENERGY MODELING AT EARLY STAGE OF DESIGN BUT, IT IS VERY HARD TO MAKE MOST OF BENEFITS OF ENERGY MODELS AS MENTIONED IN BOOKS AND ARTICLES. Use baseline building from Simulation Software Design Builder / Energy Plus
eQuest / DOE2 or Other Run GenOpt Optimization Software BASIC ENERGY MODELING BUILDING OPTIMIZATION BEGINS AT 90% CD
NO CHANCE TO INVOLVE PROJECT AT EARLY DESIGN STAGE
1 SCENARIO, 5 TRADEOFFS BEGINS AT 50% CD (SCHEMATIC DESIGN)
COWORKS WITH THE PROJECT TEAM AT EARLY DESIGN STAGE
2 SCENARIO, 4 OPTIMIZATIONS ADDITIONAL ENERGY SAVINGS RANGE FROM 3% TO 15%

MAXIMUM LEED POINTS CAN BE ACHIEVED WITH YOUR DESIGN AND CONSTRUCTION BUDGET

VARIABLES ARE OPTIMIZED TO BE COST-EFFECTIVE WITHIN BLDG DESIGN AND CONSTRUCTION BUDGET KEY COMPARATIVE ANALYSIS INFORMATION DERIVED FROM BUILDING ENERGY MODELING IS USED TO ASSIST IN THE DESIGN DEVELOPMENT & DECISION MAKING PROCESS. Evaluation of ideas and proposals SCHEMATC DESIGN CONSTRUCTION DOCUMENTS &
BUILDOUT DESIGN DEVELOPMENT AS BUILT OR DESIGNED COMPARE TO BASELINE BUILDING MODEL CREATED Designers Builders Manufacturers Consultants Architects Engineers HVAC
Contractor Electrical Contractor General
Contractor Measure and Verify one three two Build & Commission Design Revisions & Trade Offs Buildng Owner Facilites
Manager Occupant Occupant Occupant Occupant Occupant Occupant Occupant Occupant Occupant Ideas Cost Reduction.... ... small Final Product--Optimized Building US Green Building Councel Federal, State and Utility Incentive Poviders, such as The Energy Trust Of Oregon Commissioners Who? DATA COLLECTION FOR MODEL CREATION CAD FILES
OR GBXML CREATION OF BUILDING GEOMETRY GOOGLE EARTH BLUEPRINTS HVAC SYSTEMS TYPE & EFFICIENCYS ENVELOPE, FENESTRATIONS, DHW LIGHTING AND SCHEDULES INSULATION
THICKNESS WINDOW
TO WALL RATIO OCCUPENCY SCHEDULES WATER HEATER, AND LIGHTING Certifiers
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