Presentation on theme: "COMMERCIAL BUILDING ENERGY AUDITS PRESENTATION"— Presentation transcript:
1COMMERCIAL BUILDING ENERGY AUDITS PRESENTATION forNEW MEXICO ASSOCIATIONOF ENERGY ENGINEERSAlbuquerque, New MexicoFebruary 22, 2011byDonald E. Swick, PE
2COMMERCIAL BUILDING ENERGY AUDITS PRESENTATION FollowingASHRAE Procedures forCommercial Building Energy AuditsPublished by ASHRAE in 2004Research Project 669 developed standardformat for reporting results of analysis.Special Project 56 developed scope of workfor various levels of analysis.
3GOALS OF TRAINING SESSION Understand current demand for Energy AuditsDefine four levels of energy audits and applicationKnow level of effort expected for each type of auditUnderstand Energy Star Target Finder benchmarkingKnow limitations of simple payback energy analysisExposure to various energy analysis software toolsAwareness of requirements for life cycle cost analysisIdentify final Report presentation requirements
4ENERGY AUDIT OBJECTIVES The objectives of an energy analysis or audit are to identify and develop modifications that will reduce the energy use and/or cost of operating a building. The results should be presented in a format that will provide the information needed by an owner/operator to decide if any or all of the recommended modifications should be implemented.
5CURRENT DRIVERS FOR ENERGY AUDIT SERVICES Demand for energy audit services can be attributed to one or more of the following items:Increasing impact of utility costs on overall operation cost of buildingsCompetitive real estate market now including energy ranking as a factor in purchasing a building.State and local energy conservation codes requiring higher efficiency for new construction, and building additions or retrofit projectsFederal, state and local governments and corporate policies demands construction and occupancy in “LEED Certified or Green Buildings”
710 COMMON PROBLEMS IN ENERGY AUDITS Reference ASHRAE Journal February 201110. Inadequate review (30% of Audits)Overestimated savings (53% of Audits)In adequate billing analysis (57% of Audits)Poor Building description (60% of Audits)Low (or missing) installed costs (60% of Audits)
810 COMMON PROBLEMS IN ENERGY AUDITS Reference ASHRAE Journal February 20115. Poor improvement selection (63% of Audits)4. No Life-cycle costing (73% of Audits)3. Improvement life too long or not provided (73% of Audits)2. Weak improvement scope (77% of Audits)1. Missed improvements (80% of Audits)
910 COMMON PROBLEMS IN ENERGY AUDITS Neglected at least three improvementHigh efficiency HVACHigh efficiency Domestic Hot WaterHigh efficiency LightingLighting Power DensityLighting ControlWall or Roof InsulationMotor DrivesHVAC ControlsFenestration Treatment
10KEY ELEMENTS OF AUDIT Analysis of current energy consumption. Description and analysis of existing energy using systems.Presentation of engineering and economic analysis.
11ANALYSIS OF CURRENT ENERGY CONSUMPTION Obtain two or more years of utility data, review building plans and conduct site walk-through to establish:Type building, principal use, and floor area, ft2Annual Energy Utilization Index, kBtu / ft2Annual Energy Cost Index, $ / ft2Breakdown spaces by function, use and area.Determine maintenance problems or practices affecting energy efficiencyConduct Benchmarking to compare energy and cost indices with similar facilities
12DESCRIPTION AND ANALYSIS OF EXISTING ENERGY SYSTEMS Description and analysis of the energy-using systems of this building, resulting from on-site observations, measurement, and engineering calculation, including:Envelope (wall, roof, floor, slab, windows, doors skylights)Lighting (interior and exterior)HVACDomestic hot waterEquipmentFood preparationConveying systemsOther systems
13PRESENTATION OF ENERGY AND ECONOMIC ANALYSIS As result of engineering analysis and economic calculations, develop:Breakdown of the components of annual energy use and costRecommended energy conservation measures including predicted savings and cost to implementDescription and cost estimate of necessary repairs in order for energy conservation measures to be effectiveA description and cost estimated of measurement and verification methods needed to determine project effectivenessEnergy analysis summaryPresent and target energy use and costSavings from recommended measures and comparison to ultimate target
14PROCEDURES FOR ENERGY AUDIT AND ANLYSIS Provide sufficient information for the owner/operator to understand:Breakdown of the components of annual energy use and costNeed to commit necessary resources for building energy costs, operation and maintenance costs including personnel, and any energy efficiency capital improvement projectsAppropriateness of recommended measures, based on institutional and organization issues (i.e. regulatory environment, financial options, and occupant requirements)Understand different levels of energy analysis can be performed based on specific purpose of owner from simple ranking of building energy usage, to contemplating major energy-saving capital improvements requiring significant level of confidence in results of engineering and economic analysis
15CATEGORIES OF ENERGY AUDIT AND ENGINEERING ANALYSIS As result of various needs of building owner, the levels of analysis are organized into the following categories:Preliminary Energy Use AnalysisLevel I Analysis – Walk-Through AnalysisLevel II Analysis – Energy Survey and AnalysisLevel III Analysis – Detailed Analysis of Capital Intensive Modifications
16PRELIMINARY ENERGY USE ANALYSIS -DETAILS Potential Owner Interface and InformationExecutive Management - Corporate goalsFacility Managers - Drawing, maintenance policies, previous energy conservation projects, schedule of facilities.
17PRELIMINARY ENERGY USE ANALYSIS -DETAILS Review of Utility DataShow examples of data for various facilities and explain what we can determine from the data about a facilityDetermine potential local utility rebate programs
18PRELIMINARY ENERGY USE ANALYSIS -DETAILS EPA Energy Star BenchmarkingDemonstrate Energy Star Target Finder analysis (based on U.S. Energy Information Administration - Commercial Buildings Energy Consumption Survey)https://www.energystar.gov/istar/pmpam/
19PRELIMINARY ENERGY USE ANALYSIS -DETAILS EPA Energy Star BenchmarkingDemonstrate Energy Star Target Finder analysis (based on U.S. Energy Information Administration - Commercial Buildings Energy Consumption Survey)g_design.bus_target_finder
21PRELIMINARY ENERGY USE ANALYSIS -DETAILS EPA Energy Star BenchmarkingU.S. Energy Information Administration - Commercial Buildings Energy Consumption Survey)tailed_tables_2003/detailed_tables_2003.html#co nsumexpen03
22PRELIMINARY ENERGY USE ANALYSIS - REPORT Provide description of facility, occupancy, usage and floor area.Present Summary Table / Graph of Utility BillsAnnual totals per fuel, average cost ($/unit) and cost per sq. ft. floor areaPresent results of Energy Star Target FinderPresent preliminary list of potential operation, maintenance and energy efficiency projects for further analysis.
23LEVEL I ANALYSIS – WALK THROUGH SERVICE -DETAILS Complete steps of a Preliminary Audit.Potential Owner Interface and InformationFacility Managers - Compare drawing to actual facility conditions, ask about equipment replacement plans, maintenance procedures, effectiveness of previous energy conservation projects, operation and schedule of equipment and facilities.
24LEVEL I ANALYSIS – WALK THROUGH SERVICE -DETAILS Existing Building Survey Information - Review drawings and documentationEnvelope components (Wall Roof, Floor, Windows, Doors, Skylights, etc.)HVAC Systems equipment components and control strategiesLighting fixture types and controlsOther energy usage systemsOccupancy information
25LEVEL I ANALYSIS – WALK THROUGH SERVICE -DETAILS Identify savings and cost analysis for low cost/no cost measuresLighting retrofits having fastest paybackBetter controls systems or strategiesObvious energy wasting operation (i.e. malfunctioning equipment, simultaneous heating and cooling)Include utility rebates in cost analysis
26LEVEL I ANALYSIS – WALK THROUGH SERVICE -DETAILS Provide a list of potential capital improvement measures (further analysis required)Building envelope feature (i.e. tinting or insulated windows, better roof insulation)HVAC retrofits including higher efficiency equipment, VFD for fans and pumps, improved building automation controls)Lighting retrofit requiring significant investment such as LED light sources, high bay and light poles.
27LEVEL I ANALYSIS – WALK THROUGH SERVICE - REPORT Provide description of facility, occupancy, usage and floor area.Present Summary Table / Graph of Utility Bills Annual totals per fuel, average cost ($/unit) and cost per sq. ft. floor areaQuantify savings potential of changing eligible alternate fuel rate structures.Present results of Energy Star Target Finder
28LEVEL I ANALYSIS – WALK THROUGH SERVICE - REPORT Summary of special problems or needs identified for operational or maintenance procedures.Preliminary end use energy breakdown estimate of major energy using components of the building.
29LEVEL I ANALYSIS – WALK THROUGH SERVICE - REPORT List of low cost/no cost savings estimate of energy savings.List of potential capital improvement projects with initial estimate of energy savings and installation costs.
30LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Complete steps of a Level I Walk Through Analysis servicesPotential Owner Interface and InformationExecutive Managemenr - Corporate financial criteria and guidelinesFacility Managers - Discuss potential energy conservation projects to compliment equipment replacement plans, anticipated changes to operation and schedule of equipment and facilities.
31LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Potential Owner Interface and Information (cont.)Operators and Technicians - Status of current equipment, validation of operational controls, existing problems areas, actual maintenance level of implementation, and modification not shown on drawings
32LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Existing Building On-Site Survey Information, validate drawings and other documentationEnvelope components (Wall Roof, Floor, Windows, Doors, Skylights, etc.)HVAC Systems components and control strategies and setpointsLighting fixture types, quantities and controlsEquipment schedules , space and occupancy information
33LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Breakdown of energy use within buildingProvide estimate based on Commercial Buildings Energy Consumption Survey data from the U.S. Energy Information AdministrationConduct preliminary energy analysis with energy simulation software (i.e eQuest, Trane Tracer or Carrier HAP-Wizard level).
37CARRIER HAP ENERGY ANALYSIS SOFTWARE 2CCLI1_DIV12_ETI496_MID4355%2C00.html
38LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Identify recommended changes to operation and maintenance activitiesProvide energy savings and cost analysis (i.e. simple payback) of practical measures that meet owners constraints and capital improvement criteriaBuilding envelope feature (i.e. tinting or insulated windows, skylights)
39LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Provide energy savings and cost analysis (cont.)HVAC retrofits involving complete replacement of existing systems including higher efficiency equipment, VFD for fans and pumps, improved building automation controlsLighting retrofit replacing MV or HID High bay fixtures with T5 Reflective High bay Fixtures or LED lamps for more efficient lamp/fixture systems.Include utility rebates in cost analysis
42LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Provide a list of capital intensive improvement that require further data and analysis.Building envelope feature (i.e. better wall or roof insulation)HVAC retrofits involving complete replacement of existing systems and significant upgrades to building automation controls).
43LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS -DETAILS Provide a list of capital intensive improvement that require further data and analysis (cont.)Lighting retrofit requiring significant investment such as LED light sources for high bay and light poles.Alternative energy generation systems like geothermal, solar PV, solar hot water, and wind energy.
44LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS - REPORT Provide summary of energy use and cost associated with each major component. Specify Computer software analysis utilized. Compare actual total utility usage and calculated energy estimates.Provide description of building including floor plans, and inventories of major equipment (place details in Appendices)
45eQUEST ENERGY ANALYSIS USE ANNUAL BREAKDOWN REPORT
46eQUEST ENERGY ANALYSIS USE MONTHLY BREAKDOWN REPORT
47eQUEST ENERGY ANALYSIS USE MONTHLY PEAK LOAD REPORT
48eQUEST ENERGY ANALYSIS USE MONTHLY FUEL COST REPORT
49LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS - REPORT List measure that are impractical or not applicable for the facilityProvide discussion of recommended energy conservation measuresExisting situation now wasting energyMeasures impact on health, safety and comfortRequired repairs of existing equipmentImpact on occupants, O&M procedures and staffUseful life of equipment
50LEVEL II ANALYSIS – ENERGY SURVEY AND ANALYSIS - REPORT Provide Summary Table with name of energy conservation measure, estimated annual energy savings, estimated installation cost, and simple payback period. Provide project summary for implementation of all recommendations measures.Recommend Measurement and Verification methods to validate performance of projects.Discuss potential capital intensive measures requiring a Level III analysis.
51Potential Owner Interface and Information LEVEL III – DETAILED ANALYSIS OF CAPITAL-INTENSIVE MODIFICATIONS-DETAILSComplete steps of a Level II – Energy Survey and Analysis servicesPotential Owner Interface and InformationExecutive Management - Owner provided detail financial criteria for life cycle cost analysis and third party financing as applicableFacility Managers - Discuss potential construction contractor and maintenance contractors that can assist with cost estimated for detailed analysis,
52LEVEL III – DETAILED ANALYSIS OF CAPITAL-INTENSIVE MODIFICATIONS-DETAILS Existing Building On-Site Survey Information, validate drawings and other documentationEnvelope components (Wall Roof, Floor, Windows, Doors, Skylights, etc.)HVAC Systems components and control strategiesLighting fixture types and controlsEquipment schedules , space and occupancy information
53Conduct more rigorous energy analysis LEVEL III – DETAILED ANALYSIS OF CAPITAL-INTENSIVE MODIFICATIONS-DETAILSConduct more rigorous energy analysisConduct energy simulation analysis with hour simulation software (i.e Trane Tracer or Carrier HAP-Detail level).Requires well defined building envelope informationDetail HVAC Systems components and control strategiesAccurate lighting and other electrical equipment levels and schedules
54Complete life cycle cost analysis of alternatives are conducted LEVEL III – DETAILED ANALYSIS OF CAPITAL-INTENSIVE MODIFICATIONS-DETAILSDetail construction costs estimates or contractor price quotes are obtained.Equipment O&M and replacements costs are determined from service contractors.Complete life cycle cost analysis of alternatives are conductedLife Cycle Costing Manual - Federal EnergyManagement ProgramConclusions are presented based on LCC evaluation of all alternatives.Conduct energy simulation analysis with hour simulation software (i.e Trane Tracer or Carrier HAP-Detail level).Requires well defined building envelope informationDetail HVAC Systems components and control strategiesAccurate lighting and other electrical equipment levels and schedules
55LIFE CYCLE COSTING MANUAL FEDERAL ENERGY MANAGEMENT PROGRAM
60LEVEL III – DETAILED ANALYSIS OF CAPITAL-INTENSIVE MODIFICATIONS-REPORT Include text, schematics and equipment lists necessary to completely describe the measure. Preliminary engineering information and detailed estimates or firm price quotes should support cost estimates.Prepare a financial evaluation of the estimated capital improvement projected energy savings.Use the owner’s chosen techniques and criteria as requested in final presentation.
61COMMERCIAL BUILDING ENERGY AUDITS PRESENTATION QUESTIONS