Xiaohui “Joeâ€‌ Zhou, PhD, PE Iowa Energy Center 2013 BOMA Iowa...

download Xiaohui “Joeâ€‌ Zhou, PhD, PE Iowa Energy Center 2013 BOMA Iowa Des Moines, IA April 16, 2013

If you can't read please download the document

  • date post

    25-Feb-2016
  • Category

    Documents

  • view

    34
  • download

    0

Embed Size (px)

description

Saving Money Through Building Energy Efficiency: The Opportunities. Xiaohui “Joe” Zhou, PhD, PE Iowa Energy Center 2013 BOMA Iowa Des Moines, IA April 16, 2013. Outline. Introduction to Iowa Energy Center Why Building Energy Efficiency is Important - PowerPoint PPT Presentation

Transcript of Xiaohui “Joeâ€‌ Zhou, PhD, PE Iowa Energy Center 2013 BOMA Iowa...

Slide 1

Xiaohui Joe Zhou, PhD, PE

Iowa Energy Center

2013 BOMA IowaDes Moines, IAApril 16, 2013Saving Money Through Building Energy Efficiency:The OpportunitiesOutline

Introduction to Iowa Energy CenterWhy Building Energy Efficiency is ImportantStrategies to Improve Building Energy EfficiencySteps to follow:Know your buildings present energy performanceAnalyze opportunities through an energy auditExplore building energy improvement optionsMonitor results

About the Iowa Energy Center

A public, non-profit organizationWas created by the Iowa General Assembly and signed into law in 1990Has a mission to serve Iowans through reliable, objective tools, and information Is administered through Iowa State UniversityHas a 13-member Advisory Council representing key constituencies and stakeholders (as described in the 1990 Energy Efficiency Act)Our Mission

Advance Iowas energy efficiency and renewable energy use through transformative research, education, and demonstrationStrive to increase energy efficiency in all areas of Iowas energy useServe as a model for state efforts on energy efficiency and renewable energyConduct and sponsor research on energy efficiency and conservation, as well as alternative energy based on renewable resourcesAssist Iowans in assessing energy-related technologies Support educational and demonstration programs

Key Program Areas

Energy EfficiencyBuildingIndustrialAgriculturalTransportationRenewable EnergyBiorenewableSolarWind

Grants and Funding IEC Sponsored GrantsAlternate Energy Revolving Loan ProgramScholarshipsOutreachLearning Institute for training and educationCommunications and MarketingWhy Building Energy Efficiency is Important

The Big Picture *Based on the 2010 Energy Data Book by the Department of Energy; 1 Quads = 1 000 000 000 000 000. Transportation28%Why Building Energy Efficiency is Important

Commercial Building Energy End-Use Type Splits *Based on the 2010 Energy Data Book by the Department of EnergyStrategies to Improve Building Energy Efficiency

How much energy can be saved by doing what?7%~28% by implementing no cost or low-cost energy efficient measures through changes in building operations and management (O&M)3.5%~15.2% by changing occupant behavior9.4%~25% by retrofitting lighting7.3%~22.9% by calibrating HVAC control devices, improve control sequences, and monitoring energy use3.5%~15.9% through replacing old HVAC equipment with new energy efficient units*Based on BOMA International BEEP 2006 reportStrategies to Improve Building Energy Efficiency

Opportunities for Existing BuildingsReduce Energy Demand: plug loads, peak demandImprove Building Energy Efficiency: operations & management; energy audit and retro-commissioningUse Renewable Energy Source: wind, solar Financial Incentives: tax credits, utility rebates*Existing buildings account for approximately 70% ~ 85% of buildings that will exist in 2030.Steps to Take

Know Your Building's Energy PerformanceAnalyze Opportunities through an Energy AuditExplore Building Energy Improvement OptionsMonitor ResultsSteps to Take: Know Your Building's Energy Performance

Know Your Building's Energy PerformanceCalculate Energy Utilization Index (EUI)Unit energy use for buildings in BTU/sq. ft. - yearCalculate Energy Cost Index (ECI)Unit cost of energy for buildings in $/sq. ft. - year

*BTU = British Thermal Unit; 1 BTU ~= 0.293 Watt-Hour Steps to Take: Know Your Building's Energy Performance

Gross Office Building Area:12500sq. ft. MONTHElectricityNatural GasTotalCost Office BldgEnergyCost EnergyCost$ Total KWHTherms$ kBTU $January608.897912835.4427397.1186507.22021006.007898February533.81159923.29190.4742967.8816624.281456March389.1015677910191.4333236.727480.5315275April299.52484955.85045.521914.1454345.0247663May509.181355201017.9219839.76527.1013084June529.87755728.7514.1220052.0531543.9974705July575.8586367.8514.4922233.3014590.3479565August496.58955614514.2619660.582510.8494889September226.54053734.8413.3813146.8724239.9205187October394.94986555.8514.2122874.9454409.1598217November516.22099379.56461.338412.2335577.5209352December547.302310953.7121111.3349484.9781658.632338Total390330.70016513.375486Average31.230.52* 1 KWH = 3.412 kBTU; 1 Therm = 100 kBTUEUI (kBTU/s.q ft. - year)ECI ($/sq. ft. - year)Steps to Take: Know Your Building's Energy Performance

What is Building Energy Benchmarking and Benefits?Building Energy BenchmarkingHow did your building compare with similar buildings?Compared to self, within a portfolio, or nationally?Does your building energy performance meet energy code?BenefitsRespond to rising energy costsEnhance your company's image and attract satisfied tenants Improve the marketability of your property by differentiating it from othersSteps to Take: Know Your Building's Energy Performance

U.S. Climate Zone MapSteps to Take: Know Your Building's Energy Performance

CityChicagoDenverMinneapolisClimate Zone5A5B6ALarge Office433646Medium Office484154Small Office514557Warehouse242329Stand-alone Retail816993Strip Mall857299Primary School655875Secondary School766489Supermarket195179208Quick Service Restaurant657604713Full Service Restaurant527481570Hospital148130153Outpatient Facility271271280Small Hotel807487Large Hotel138131150Mid-Rise Apartment474154DOE Commercial Building Benchmarks New Construction

EUIs (kBtu/sq. ft-yr)

October 2009Steps to Take: Know Your Building's Energy Performance

Benchmarking Systems 1: EPAs Energy Star Portfolio ManagerBased on national survey 2003 CBECS database by EIA (Energy Information Administration)Provides a comparison for 15 commercial building typesScaled in 1 100 relative to similar buildings nationwide (highest number is the most energy efficient building)Building rating above 75 may receive Energy Star labelhttp://www.energystar.gov/index.cfm?c=evaluate_performance.bus_PortfolioManager

Steps to Take: Know Your Building's Energy Performance

Energy Star RatingSteps to Take: Know Your Building's Energy Performance

Benchmarking Systems 2: ASHRAE Building Energy QuotientRatings for both design and operationRequires more detailed information than the monthly utility billProvides more detailed opportunity analysishttp://buildingenergyquotient.org/

Steps to Take: Know Your Building's Energy Performance

Benchmarking Systems 3: U.S. Department of Energy Commercial Building Asset ScoreStill being developedScale 1 - 100 (higher number is better)Intended to help identify inefficient areas in building energy http://www1.eere.energy.gov/buildings/commercial/assetscore.html

Steps to Take: Know Your Building's Energy Performance

Steps to Take: Know Your Building's Energy Performance

Steps to Take: Know Your Building's Energy Performance

Benchmarking Systems 4: Iowa Public Building Benchmarking SystemWeb-based platformIowa public buildings (now 1200+ buildings)Benchmarking ratio: Benchmark energy use based on current energy code. 1.0 = energy code compliant building (lower number is better)Also includes Energy Star rating (if applicable) and peer ratingCurrently recruiting up to 800 new buildingshttp://www.iowaenergycenter.org/

Steps to Take: Know Your Building's Energy Performance

Steps to Take: Analyze Opportunities

Setting Goals10%, 20%, or 30% compared with historical EUI?LEED for existing buildings? (O&M certification requires a minimum of 69 on ENERGY STAR rating)Benchmarking ratio below 1.0? Strong Management SupportSteps to Take: Analyze Opportunities

Analyze How and Where Did Energy Go - PrioritizeSub-MeteringEnergy AuditsLevel 1: Walk-throughLevel 2: Energy survey and analysisLevel 3: Detailed analysis and capital -intensive modificationsUtility programs no cost or low-cost for qualified customers

Improve Building Operations No Cost or Low-CostReduce HVAC equipment's occupancy hoursReduce lighting hours, use day lighting, or use occupancy sensorsReplace/repair/calibrate sensorsUse a programmable thermostatRelocate/shield temperature sensorsUse economizerUse duct static pressure resetUse supply air temperature reset

Steps to Take: Building Energy Improvement Options

Use demand-controlled ventilation (DCV)Chilled water supply temperature resetOptimize heating water supplyOptimal start/stopTune HVAC control check the thermostat schedule!Check minimum damper positionAutomated fault detection and diagnosticsBest janitorial practices

Steps to Take: Building Energy Improvement Options

Steps to Take: Building Energy Improvement Options

Using improved duct static pressure reset strategy, saved ~37% of fan energy in 3 months field testing in this 40,528 sq. ft building; ~$3839 / year .Example: Iowa State University Hixson-Lied Student Success Center Management Improvements Low-Cost or No CostMake energy management a priorityRequire systems manuals (operation and maintenance, etc.)Invest in training and education for operators and occupants change occupant behaviorEstablish purchasing criteria: Energy Star-labeled appliance/equipment, CFL, LED, etc.Insist on performance tracking and reporting

Steps to Take: Building Energy Improvement Options

Lighting RetrofitUse occupancy sensorsUse day lighting, photo cells, and dimming controlsReplace with new energy efficient lightingCompact Fluorescent (CFL)Light-emitting Diode (LED)Fluorescent T8 or T5Use external/internal shading devices

While a modern office can be lit using