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Your Name Your title and organization

Your Name Your title and organization

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Your Name Your title and organization

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  1. Your Name Your title and organization

  2. MOTIVATION Mission to provide a tool that a designer will use routinely to guide his or her decisions while developing the design of low- energy building. Vision Eventually all buildings will be designed to be delightful living, working, and learning environments, enhanced by natural light, requiring minimum resources to build and operate, This library, built in 1980, has saved about 39 billion Btu (about $740,000) over its 20 years operation, compared to a typical library. It cost no more to build and gets rave reviews from the librarians and users. –and that do not impair the environment for following generations.

  3. E -10's NICHE NERGY ENERGY-10 is suitable for smaller buildings–commercial and institutional buildings under 10,000 sq. ft. – and also residential 76% of all non-residential buildings are under 10,000 sq. ft., representing 22 % of the total built floor area and 26% of the energy use. <10,000 sq This restriction will be removed in Version 2

  4. E -10 NERGY National Renewable Energy Lab project lead, passive solarbuildings expertise, PV Berkeley SolarGroup CNE thermal simulation engine Team Sustainable BuildingsIndustry Council distribution, user supporttraining Lawrence BerkeleyNational Lab daylighting U.S. Department of Energy funding and oversight

  5. Highlights • First user-friendly program based on hour-by-hour building simulation targeting early conceptual design decisions • Automates many routine tasks, reducing time to produce results needed to make design decisions from days to hours • Graphic input and output • Technically solid • Becoming widely used, both in practice and for teaching • Major enhancements are in the pipeline • Graphic input, Improved Daylighting, PV…

  6. Whole Building Focus Evaluate a wide range of energy-efficient strategies,working together Passive solar heating Daylighting High Efficiency HVAC Insulation Reduced duct leakage Better windows Energy efficient lights and ballasts Lighting controls Thermal mass Better HVAC Controls Economizer cycle Reduced infiltration Shading

  7. Design Process Focus ENERGY-10 focuses on the first phases (conceptual design) Activity Phase Tool Develop reference case Develop low-energy case Rank order strategies Initial strategy selection Set performance goals ENERGY-10 Develop Brief Pre-design Review goals Review strategies Set criteria, priorities Preliminary team meetings Schematic Design Develop schemes Evaluate schemes Select scheme ENERGY-10 Design Development Confirm that component performances are as assumed EnergyPlus or other HVAC simulation and tools Construction Documents

  8. Ease of Use Automatic features make it easy and fast • AutoBuild - defines a complete building based on five inputs and many defaults • APPLY - creates a second building applying upgrades to implement any or all of 12 energy-efficient strategies • RANK - determines relative effectiveness of strategies

  9. ENERGY-10 There are over 2000 registered users (Apr. 02) 83 site licensees are established. 60 of these are at colleges and universities where ENERGY-10 is being used as a teaching tool. Multiple answers possible Building Types Analyzed Who is using the program Non-residential adds to 128%

  10. Completely integrated hourly calculations Analysis ENERGY-10 has two powerful engines under the hood: Daylighting DOE2 split flux methodThermal CNE thermal network Each carries out 8760-hour detailed simulations. Thus interactive effects are accounted properly.

  11. ENERGY-10 Compare CNE results BESTEST with other simulation programs, DOE-2, Validation BLAST, EnergyPlus, SERI-RES, ESPr, etc. 12C Range of other results Free floating temperatures CNE result Range of other results Strongly solar driven building CNE result CNE -8C 24 24 12 TIME OF DAY

  12. AutoBuild Feature • Creates two building descriptions based on five inputs and user-defined defaults. • Location • Building Use • Floor area • Number of stories • HVAC system For example: apply Reference Case Low Energy Case R-8.9 walls (4" steel stud) R-19.6 Walls (6" steel stud with 2" foam) R-19 roof R-38 roof No perimeter insulation R-10 perimeter insulation Conventional double windows Best low-e double windows Conventional lighting Efficient lights with daylight dimming Conventional HVAC High efficiency HVAC Conventional air-tightness Leakage reduced 75% Uniform window orientation Passive solar orientation Conventional HVAC controls Improved HVAC controls Conventional duct placement Ducts located inside, tightened Gets you started quickly.

  13. Albuquerque School 20,000 ft2 elementary school ANNUAL ENERGY USE 100 Reference Case 75.8 80 Low-Energy Case 60 kBtu / ft² 40 30.7 27.4 19.3 20 15.1 14.9 10.7 6.6 5.7 0.2 0 Heating Cooling Lights Other Total

  14. Emissions of Pollutants ENERGY-10 converts electrical and thermal energy use to annual emissions. ANNUAL EMISSIONS, Albuquerque School Pounds/year Reference Case Low-Energy Case 399000 1860 1020 970 186000 530 SO2 NOx CO2 Indicates the environmental impact

  15. AutoSize Feature ENERGY-10 uses the simulation engine to size HVAC equipment. The process is automatic and takes only 1 or 2 seconds. HVAC cost reductions can pay the added cost of all the other upgrades! HVAC RATED CAPACITIES, Albuquerque School Reference Case Low-Energy Case 802 29484 kBtuh 687 21162 478 349 AutoSize tells the story heating cooling CFM Provides the right information at the right time.

  16. APPLY Feature Automatically modifies the building description to implement any or all of 12 strategies Beforeapply Afterapply Lights Other Total Cooling Heating A few mouse clicks does it—saving timeYet the user has total control

  17. Daylighting • Daylighting improves occupant performance. - In rigorous statistical studies, involving 21,000 students in 3 school districts, test scores increased by 15% to 26% in those that were daylit. - In an otherwise identical group of 108 retail stores, sales increased by 31% to 49% in those that had daylighting, compared to those without! See

  18. Daylighting Interactions Daylighting + Thermal Thermal network method (exact energy balance) 12 equipment options Split-flux method ENERGY-10 accounts for complex interactive effects, such as those shown here (dimming lights in response to daylight reduces cooling but increases heating). Reductions in peak load are also evaluated, which effects equipment sizing.

  19. Workshops Two-day workshops are a primary means of dissemination, providing critical instruction in the principles of energy efficient design and hands-on training in the use of ENERGY-10. 53 two-day workshops have been conducted. 1111 people have attended a workshop. Average attendance is 21 persons.

  20. Architectural Award The Progressive Architecture Research Award was given to NREL and SBIC for the Designing Low-Energy Buildings with ENERGY-10 package. Doug Balcomb, author of ENERGY-10 receiving the award in the Grand Ballroom at the Waldorf Astoria, New York

  21. WeatherMaker • EVALUATE • Many powerful graphical views of the data • ADJUST • create new weather files • expands the available sites 16 fold • CONVERT FILE FORMATS

  22. Make Weather Files 3865 locations on this map plus many in Hawaii and Alaska monthly data are stored on the ENERGY-10 CD-ROM and are automatically loaded by the ADJUST wizard

  23. Working with the Profession • From the beginning, the program has been developed in collaboration with architects and their their consultants • The Sustainable Buildings Industry Council disseminates the program, provides user support, and organizes the training

  24. New in Version 1.5 • Life-cycle cost calculations • New approach to libraries • New approach to saving schemes • Many fixes to Version 1.3 • Porting to Visual C++ 6.0 (many hidden benefits)

  25. Life-Cycle Costs • Full discounted cash flow analysis, accounting for all relevant factors to support cost/tradeoff decisions during conceptual design • Ranks based on LCC, IRR, benefit/cost, or simple payback

  26. Life-Cycle Costs

  27. Prioritizing Strategies RANKING OF ENERGY-EFFICIENT STRATEGIES 78.39 New ranking options in Version 1.5: Net present value Internal rate of return Benefit/cost ratio Simple payback Duct Leakage 66.38 Insulation 48.85 Daylighting 45.96 Glazing 40.82 Energy Efficient Lights 38.73 HVAC Controls gives the relative savings if strategies were to applied individually 35.89 Air Leakage Control 26.22 Passive Solar Heating 21.12 High Efficiency HVAC 13.67 Shading 2.85 Economizer Cycle -20 0 20 40 60 80 Net Present Value, k$ Procedures, such as sequencing simulations and rank ordering, are automated, greatly reducing the time required. This entire set of calculations, including making the plot, took about 10 minutes. Parametric analysis helps guide decisions regarding best strategies to meet design team goals

  28. Many new graphics options HVAC Rated Capacities Annual Emissions Results Reference Case Low-Energy Case Reference Case Low-Energy Case 249007 400 12000 1400 250000 386 358 10741 1215 1200 10000 200000 300 1000 8000 230 6851 150000 Annual CO2 Emissions, Pounds 800 729 128607 lbs kBtuh Fan Volume, CFM 662 200 6000 600 157 100000 4000 382 400 100 50000 2000 200 0 0 0 0 SO2 NOx CO2 Heating Cooling Fan Low-Energy Case - Performance Summary DMAP (3D color) 100 1.0 $0.90 86.0 80 0.8 34.2 60 0.6 0.60 Annual Energy, kBtu / sq. ft. Annual Cost, $/sq. ft. 55.1 10.3 40 0.4 34.2 40.2 0.16 20 0.2 10.3 0.12 7.6 2.9 1.3 0.01 0 0.0 Loads Consumption Cost Other Summary Solar gains in a passive solar building every hour of the year Lighting Cooling Heating

  29. Many new graphics options Daily solar gains tight leaky Passive solar building Infiltration loads Typical monthly profiles Altogether, there are about 10 times as many plotting options in Version 1.5 as in Version 1.3

  30. "Schemes" • Replaces “variants” in Version 1.3 • Buildings saved individually as schemes, rather than in pairs. • Any two schemes that have been saved can be opened, side-by-side, and compared.

  31. Libraries • New whole approach to libraries. • User-named libraries, e.g. “GREGLIB”. • Libraries saved stored with the scheme, guaranteeing compatibility. • One password protected library (ARCHIVELIB) for classroom use. • New libraries for costs, EES strategies characteristics, defaults, etc.

  32. Coming in Version 2.0 • Graphic input routine for building description • Improved daylighting calculations • PV simulations (already in Version 1.4 as an expert-user beta test)

  33. Demonstration Reference Case (energy hog) Evaluate20000 ft2 school inAlbuquerque Apply Strategies Low Energy Case

  34. Thanks for your attention.