Using ASHRAE s ECB Method for determining the LEED TM Energy & Atmosphere Credits

Transcription

1 Using ASHRAE s ECB Method for determining the LEED TM Energy & Atmosphere Credits

2 LEED TM NC-2.1 Point Distribution Possible Points Percent Sustainable Site Water Efficiency 5 7 Energy & Atmosphere Materials & Resources Indoor Environmental Quality Innovation & Design Process 5 7 Total

3 Energy & Atmosphere Credit Task Points Prereq. 1 Building Commissioning Req. Prereq. 2 Minimum Energy Performance Req. Prereq. 3 Zero CFC in HVAC&R Req. 1.0 Optimize Energy Performance Renewable Energy 5-20% Additional Commissioning Ozone Depletion Measurement & Verification Green Power 1 Total 17

4 Energy & Atmosphere Optimize Energy Performance Task % Savings Points Reduce Energy Costs 15% 1 Reduce Energy Costs 20% 2 Reduce Energy Costs 25% 3 Reduce Energy Costs 30% 4 Reduce Energy Costs 35% 5 Reduce Energy Costs 40% 6 Reduce Energy Costs 45% 7 Reduce Energy Costs 50% 8 Reduce Energy Costs 55% 9 Reduce Energy Costs 60% 10

5 Energy & Atmosphere Optimize Energy Performance Submittals Complete the LEED TM Letter Template incorporating a quantitative summary table showing the energy savings strategies incorporated in the building design. Demonstrate via summary printout from energy simulation software that the design energy cost (DEC) is less than the energy cost budget (ECB) as defined in ASHRAE , section 11.

6 For LEED TM NC-2.1, you should be using ASHRAE (without amendments) not ASHRAE or ASHRAE or ASHRAE (coming soon, Appendix G will have major impact on ECB)

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8 ASHRAE Organization of the Standard 1. Purpose 7. Service Water 2. Scope Heating 3. Definitions 8. Power 4. Administration and 9. Lighting Enforcement 10. Other Equipment 5. Building Envelope 11. Energy Cost 6. Heating, Ventilating Budget Method and Air- 12. Normative Conditioning References

9 ASHRAE Overview of Requirements Energy Cost Budget Method (ECB) Described in Chapter 11 (ECB Method) An alternative for all proposed design except designs with no HVAC systems Compliance is achieved if the requirements of all Mandatory sections AND the design energy cost (DEC) does not exceed the energy cost budget (ECB) AND the energy efficiency level of components specified in the building design meet or exceed the efficiency levels used to calculate the design energy cost (DEC)

10 ASHRAE Overview of Requirements Energy Cost Budget Method (ECB) Chapter 11 (ECB Method) is about 7 pages of rules that define the relationship between the budget building design and the proposed design and define how simulation calculations are to be made, and how the design energy cost (DEC) and the energy cost budget (ECB) are to be calculated. Some type of Building Energy Simulation program must be used (DOE-2, BLAST, EnergyPlus, etc).

11 ASHRAE Overview of Requirements Energy Cost Budget Method (ECB) The energy cost budget and the design energy cost are applicable ONLY for determining compliance with They are NOT predictions of actual energy use or costs in the proposed building after construction

12 ASHRAE Creating your ECB First thing you have to do is to dumb your building down to create your Energy Cost Budget (ECB) or Benchmark. Separate your regulated energy components (heating, cooling, pumps, fans and lighting) from your non-regulated components (plug loads, process energy and exterior lighting). This will require some post-processing of simulation reports.

13 LEED TM ECB Energy Savings Calculation Procedure

14 ASHRAE Creating your ECB Chapter 5 (Building Envelope) is accompanied by 4 normative appendices: - A default assemblies and U-, C- and F- factor calculations - B the 26 climate zone prescriptive tables - C the envelope trade-off mechanism (i.e., methodology used in ENVSTD) - D the climate data

15 AZ Climate Data in ASHRAE 90.1 Table HDD 65 CDD 50 Flagstaff B-18 7,131 1,661 Kingman B-11 3,212 5,040 Phoenix B-5 1,350 8,425 Tucson B-6 1,678 6,921 Yuma B ,897

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17 Table B-5 Building Envelope Requirements (HDD65: , CDD50; 7201+) Opaque Elements Roofs Insulation Entirely above Deck Metal Building Attic and other Walls, Above Grade Mass Metal Building Steel Framed Wood Framed and other U U U U U U U Non Residential Assembly Maximum Insulation min. R-value R-15.0 R-19.0 R-30 NR R-13.0 R-13.0 R-13.0

18 Table B-5 Building Envelope Requirements (HDD65: , CDD50; 7201+) Opaque Elements Wall, below Grade Below Grade Wall Assembly Maximum C Non Residential Insulation min. R-value NR Floors Mass Steel Joist Wood Framed and other Slab-on-Grade Floors Unheated Heated U U U U U R-4.2ci R-19.0 R-19.0 NR R-7.5 for 12in.

19 Table B-5 Building Envelope Requirements (HDD65: , CDD50; 7201+) Fenestration Vertical Glazing, % of wall % % % % % Assembly Max. U (Fixed/ Operable) U fixed 1.22 U oper 1.27 U fixed 1.22 U oper 1.27 U fixed 1.22 U oper 1.27 U fixed 1.22 U oper 1.27 U fixed 1.22 U oper 1.27 Assembly Max. SHGC (All orientations/north- Oriented) SHGC all SHGC north SHGC all SHGC north SHGC all SHGC north SHGC all SHGC north SHGC all SHGC north -0.61

20 ECB Budget System Type

21 ECB Budget System Type

22 TABLE 6.2.1A Electrically operated Unitary Air Conditioners and Condensing Units-Minimum Efficiency Requirements Equipment Type Air Conditioners, Air Cooled Size Category <65,000 Btu/h >=65,000 Btu/h and <135,000 Btu/h >=135,000 Btu/h and < 240,000 Btu/h >=240,000 Btu/h and <760,000 Btu/h >=760,000 Btu/h Sub Category or Rating Condition Split System Single Package Split System and Single Package Split System and Single Package Split System and Single Package Split System and Single Package Efficiency 10.0 SEER 9.7 SEER 10.3 EER 9.7 EER 9.5 EER 9.7 IPLV 9.2 EER 9.4 IPLV

23 TABLE 6.2.1A Electrically operated Unitary Air Conditioners and Condensing Units-Minimum Efficiency Requirements Equipment Type Air Conditioners, Water, and Evaporatively Cooled Condensing Units, Air Cooled Condensing Units, Water, or Evaporatively Cooled Size Category <65,000 Btu/h >=65,000 Btu/h and <135,000 Btu/h >=135,000 Btu/h and < 240,000 Btu/h >=240,000 Btu/h >=135,000 Btu/h >=135,000 Btu/h Sub Category or Rating Condition Split System and Single Package Split System and Single Package Split System and Single Package Split System and Single Package Efficiency 12.1 EER 11.5 EER 11.0 EER 11.0 EER 10.3 IPLV 10.1 EER 11.2 IPLV 13.1 EER 13.1 IPLV

24 TABLE Lighting Power Densities Using the Building Area Method Building Type Convention Center Dining: Cafeteria/Fast Food Dormitory Hospital/Health Care Hotel Library Motel Multi-Family Museum Office Post Office Retail School/University Sports Arena Town Hall Lighting Power Density

25 LEED TM ECB Energy Savings Calculation Procedure Establishing an ECB Benchmark for Building XYZ Non-Regulated kwh Regulated Cost NR Cost R Space Cooling(E) 444,900 $33,812 Heat Rejection(E) Space Heating (E) 4,100 $312 HP Supplement 500 $38 Hot Water(G) kbtu $1,065 Vent. Fans(E) 73,700 $5,601 Pumps & Aux(E) 800 $61 Misc. Equip(E) 324,000 kwh $24,624 Lighting(E) 432,200 $32,847 Total 952,200 $72,671 $25,689 Arizona Electric = $0.076/Kwh Gas = $5.31 MCF BENCHMARK IS 952,200 kwh OR ENERGY COST BUDEGET (ECB) METHOD $72,671

26 LEED TM ECB Energy Savings Calculation Procedure Establishing an ECB Benchmark for Building XYZ Non-Regulated kwh Regulated Cost NR Cost R Space Cooling(E) 294,400 $22,374 Heat Rejection(E) Space Heating (E) 2,940 $223 HP Supplement 500 $38 Hot Water(G) kbtu $1,065 Vent. Fans(E) 54,200 $4,119 Pumps & Aux(E) 800 $61 Misc. Equip(E) 324,000 kwh $24,624 Lighting(E) 317,200 $24,107 Total 666,540 $50,657 $25,689 Arizona Electric = $0.076/Kwh Gas = $5.31 MCF DESIGN ENERGY COST (DEC) $50,657 % SAVINGS = 100 x ($72,671 - $50,657)/$72,671 = 30% 30% SAVINGS EQUAL 4 LEED POINTS

27 Additional Information ASHRAE s Energy Cost Budget (ECB) Method, Section 11 in is available on the website as a read only pdf file or can be purchased. Your local ASHRAE chapter LEED Reference Guide, is available on website as a read only pdf file or can be purchased. Your local USGBC chapter