Design firms will be in the best position to meet their clients’ needs by understanding and preparing for ASHRAE 90.1-2010 and LEED v4, both of which have evolved from their earlier versions and will have major impacts on buildings in the very near future.
This presentation will illustrate the effect of these changes by applying the new standards to an existing LEED Silver-certified project constructed in 2008 by KJWW Engineering Consultants using ASHRAE 90.1-2004.
First, a new baseline using the ASHRAE 90.1-2007 standard will be applied to the project, which is the requirement under LEED v2009. Next, a baseline for the project using ASHRAE 90.1-2010 will be applied to the project, which represents the requirements under LEED v4. Both comparisons will show the decrease in energy savings, points awarded, and strategies and cost required to bring the project back to the original energy savings and the LEED certification it might attain.
The project’s real-life, existing energy performance will be presented as an overlay to all of the comparisons.
1. Code Dread
Keeping up with ASHRAE and LEED
Stormy Shanks | KJWW Engineering Consultants
Jeff Boldt | KJWW Engineering Consultants
Scott Bowman | KJWW Engineering Consultants
2. Learning Objectives
• Participants will be able to…
– identify the major changes in ASHRAE 90.1-2010 and why it is
important to begin preparing clients for these changes now.
– describe the changes made in ASHRAE 90.1 over the years making for
more stringent requirements and an increased need for creative and
innovative solutions.
– discuss how a LEED-certified building under one version of the
standard would not necessarily be certified under a newer version -and changes required to maintain the projected energy savings.
– identify how energy modeling can help design firms plan for and reach
a project’s energy savings goal with respect to ASHRAE 90.1-2010 and
LEED v4.
3. Agenda
• ASHRAE 90.1-2010
– What are the major changes? Where are we
going?
• THE PROJECT
– KJWW Engineering Consultants Expansion
• ENERGY MODELING
– Progression of modeling through advancing
standards
• LEED CERTIFICATION
– Effect of later LEED versions on project
5. Speakers…
Stormy Shanks, PE BEMP
Mechanical Engineer
Energy Modeling Task
Force Member
shankssl@kjww.com
Jeff Boldt, PE HBDP
LEED AP BD+C
Principal
Director of Engineering
boldtjg@kjww.com
Scott Bowman, PE
LEED AP BD+C
Principal
Corporate Sustainability
Leader
bowmansc@kjww.com
6. Speakers…
We would also like to give special thanks to:
Michael Rosenberg
Pacific Northwest National Laboratory
For his wonderful assistance , review, and advice while putting
this presentation together!
Brandon Schnier
KJWW Engineering Intern
Iowa State University
For all the energy modeling required for this project. Hopefully
you will decide to join us after graduation!
7. What are the major changes? Hints to 2013?
ASHRAE 90.1-2010
8. Improvement in ASHRAE Standard 90.1 (Year 1975 – 2010)
110
14%
Energy Use Index (1975 Use = 100)
100
ASHRAE 90-1975
ASHRAE 90A-1980
.5%
90
4.5%
12.3%
ASHRAE 90.1-1989
ASHRAE 90.1-1999
80
ASHRAE 90.1-2001
4.5%
18.5%
ASHRAE 90.1-2004
70
ASHRAE 90.1-2007
DOE 30%
Reduction
Target
60
ASHRAE 90.1-2010
50
1970
ASHRAE 90.1-2013?
1975
1980
1985
1990
1995
Year
2000
2005
2010
2015
Courtesy PNNL
9. ASHRAE 90.1-2010
• More equipment is being regulated
– Computer loads
– Elevators, escalators, and fast-walks
– Domestic water booster pumps
10. ASHRAE 90.1-2010
• Roofs:
– Cool roofs required in some climate zones
• Envelope:
– No major changes to R values or SHGFs
– Must have more south glazing than east or west
• Orientation? Land purchases? Campus planning?
• Exceptions for storefront, shaded buildings, shading
from adjacent buildings, alterations with no net change
in glazing
12. ASHRAE 90.1-2010
• Skylights (or Clerestories):
– Required in some large, tall, top-floor rooms
• Greater than 10,000 sf
• Directly under a roof with ceiling height over 15 ft
• And space type is office, lobby, atrium, concourse,
corridor, gymnasium, convention center, etc.
• Clerestories facing north save more energy
13. ASHRAE 90.1-2010
• Fan power
– Efficient fans required
– Low static systems needed
• Larger ductwork
• Larger air handling equipment
• Fewer and better fittings
– Incentive for energy recovery
• More static pressure allowed
• Linear equation☺
14. ASHRAE 90.1-2010
• Reheat
– Loopholes closed
• No more hospitals with constant volume reheat!
– No reheat allowed unless:
• Less than 30% of peak flow (or now 20%/50%), or
• Flow no more than required air changes
– Air changes required by codes or accreditation standards
– Exception if 75% of heat is recovered
– ORs only pressurized when unoccupied
– 2012 IECC is less restrictive, except big mistake
deleting the 30% exception
15. ASHRAE 90.1-2010
• Overhead Heating:
– Where return/exhaust are higher than 6 feet
• Limits the heating air temperature to no more than
20°F above space temperature
– Supplemental heat (radiant or convective) may be
needed
– Better envelope to reduce load may be a less
expensive and lower energy option
16. ASHRAE 90.1-2010
• Economizers:
– Required in more climate zones
– Required for smaller systems
• Capacity greater than 4.5 tons
• Was greater than 11.5 tons in 2007!
• Energy recovery required for more systems
– Greater than 70% outside air and 5,000 cfm in
2007
– Now greater than 30% OA and 5,500 cfm of EA
– Basically all commercial systems require ER
17. ASHRAE 90.1-2010
• Lighting Controls:
– Daylighting control required (first time)
• Defined zones of area around windows and skylights
– More occupancy types required
• Added training, lecture, storage, offices (< 250 sf),
restrooms, locker rooms
• Manual on required, except restrooms, public corridors,
and stairs
• Bi-level required for most spaces (not corridors)
– Parking garages
• Reduce power 30% if no activity in >3600 sf
18. ASHRAE 90.1-2010
• Lighting Controls:
– Exterior lighting MUST turn off
• When sufficient daylight is available
• Astronomical timer or daylight sensor
– Façade and landscape lighting
• Off from midnight or closing to 6 am or opening
– Higher LPD allowed with control (5-10%)
– Functional testing required!
– Whole-building off required (with exceptions)
19. ASHRAE 90.1-2010
• Receptacles:
– 50% of 120V receptacles require automatic
switching
• Offices and computer classrooms
– Options
• Time of day
• Occupancy sensor
• Another control or alarm system
– Some exceptions
21. Project Facts
•
•
•
•
•
•
•
•
Built in 2007
17,500 sf Addition with 2,500 sf remodel
75 workspaces added
8 private offices
4 conference rooms
Café 623
Gathering space
Interior courtyard
22.
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24.
25.
26.
27.
28.
29.
30.
31. Project Facts
• Mechanical:
– High efficiency RTUs (DX/Gas)
– Dedicated Outside Air System (tempered)
– Ventilation direct to stations
– Energy Recovery Ventilator
– Some radiation at windows
• Electrical:
– Indirect lighting with Task Lighting
– Occupancy control
– Top daylighting
32. HVAC System Schematic
Ventilation Unit
with ERV
Zone Control Units with
DX and Gas Heat
Return Air Plenum
Humidistat for
Ventilation Override
H
T
Zone Control
Thermostats
Perimeter Radiation at Windows
Zone Conditioning
Supply Air
Ventilation Air Supply
to Workstations
(Conditioned/Dry)
33.
34.
35. LEED v2.2 Certified Silver
LEED v2.2
SILVER
Sustainable Sites
8/14
Water Efficiency
3/5
Energy & Atmosphere
5/17
Materials & Resources
7/13
Indoor Environmental Quality
9/15
Innovation & Design Process
5/5
Project Total
35/69
36. LEED v2.2 Certified Silver
• Increased open space
• Stormwater
Management
– 26% decrease from preproject
– 90% treated on site
• Light Pollution
Reduction
• Over 40% water
reduction
– Exemplary
• Commissioning as
owner
• 98% construction waste
diverted
– Demolished building
– Exemplary
•
•
•
•
20% recycled content
24% local materials
82% FSC wood
Lighting controllability
39. Background
• Software used at KJWW
– Trane Trace
– eQUEST
– Sefaira
• Energy Modeling Task Force
– Expertise within all teams
– Engineers doing models
– Building internal dedicated experts
– Now have dedicated modelers for whole firm
40. ASHRAE 90.1-2004
• Baseline HVAC System Type 3 – packaged rooftop
unit with DX cooling and natural gas heating
• Baseline fenestration modeled in uniformly
distributed horizontal bands
• Baseline fan power dependent only on system
type and supply CFM
• Building area method for lighting
• Seasonal energy rates with winter block rates
• Exceptional calculation for process load <25% of
baseline
42. ASHRAE 90.1-2007
• Baseline HVAC System Type 3
• Baseline fenestration area and distribution
matches design
• Baseline fan power increased due to pressure
drop allowance for MERV 13 filtration
• No change to Building Area Method for
lighting power
• No change in process loads
46. ASHRAE 90.1-2010
General
• Documentation
– Exceptional Calculation Documentation
• Exceptions added for baseline rotations
• Heating-only baseline system types added
• Requires modeling of shading from adjacent
structures in baseline
• Softened requirements on unmet load hours
• Purchased HW or CW treated like utility – no
trade-offs
47. ASHRAE 90.1-2010
General
• Modified baseline systems for DES
• Consistent with LEED DES requirements now
• Allows different level of ventilation in
proposed and baseline design
• New mandatory requirements for lighting
controls and exhaust air energy recovery must
be included in baseline models.
• How LEED v4 will handle Process Loads?
48. ASHRAE 90.1-2010
• Changes for this project to the baseline from
2007 (and 2004)…
– Lighting power density reduced from 1.0 to 0.9
– Baseline fan power calculations
– Envelope improvements
– Equipment efficiency improvements
• Minimum Mandatory Requirement
– Daylighting Control
52. How does the project fare moving to later versions of LEED?
LEED CERTIFICATION
53. Methodology
•
•
•
•
•
•
Started from known project certification
Maintain original goal of LEED Silver
Change from v2.2 to v2009 more predictable
Reviewed original submittals to new credits
Looked for lost opportunities
Definitions;
– Projected = reasonable expectation
– Expanded = possible, with increased cost
• Normalized v2.2 for 110 points
54. Energy First…
•
•
•
•
•
•
EAp2 and EAc1 (EAc2 for v4)
Changes in weighting between versions
Adjustment in v4 for advanced code
Lighting controls
Efficient selections
Probably does not extend to more complex
systems (particular to THIS project)
60. LEED v2009 Projected
• Modest change in SS
• Modest change in WE
• Loss in MR
– Even with baseline
change
• Loss in IEQ
• Did not meet EAp2 with
base system
– Had to add daylighting
– Recovered some savings
– Weighting change?
– Weighting change?
• Recovered some with
Regional Priority
62. LEED v2009 Expanded
• Waterless Urinals
– 10% increase in WE
• Energy Systems
– Daylighting Control
– Improved Envelope
– Reduced lighting density
• Green Power
• IEQ Testing
• Low Mercury Lamps
64. LEED v4 Projected
• Loss in LT/SS
–
–
–
–
Density
Green parking
Heat island
Open space
• Energy Systems
– Daylighting control
required for 90.1-2010
• Loss in MR
– Unsure of changes?
• Loss in IEQ
– Controllability
– Gain acoustic point
• Lost all Regional Priority
Credits!
– Change in Illinois focus
66. LEED v4 Expanded
• Site Assessment
• Waterless Urinals
– 10% increase in WE
– Add meter
• Energy Systems
– Geothermal
– Improved envelope
– Reduced lighting density
• Commissioning
– Envelope commissioning
• Green Power
• IEQ Testing
• Low Mercury Lamps
69. What did we learn?
• LEED is definitely advancing
– Silver today, Certified tomorrow?
• A major shift will be required to continue
improving energy performance
– More aggressive measures will be needed
– Some strategies today are required tomorrow
• Clients will need to be educated
– Expectations may need to change
70. What can you do?
• Early and robust energy modeling
– Review orientation
– Shading and/or low SHGFs
• Consider system optimization
– Larger ductwork and air handling equipment
– Heat recovery for reheat
– Dedicated outdoor air systems
• High performance envelopes
– Commission envelopes
71.
72. Speakers…
Stormy Shanks, PE BEMP
Mechanical Engineer
Energy Modeling Task
Force Member
shankssl@kjww.com
Jeff Boldt, PE HBDP
LEED AP BD+C
Principal
Director of Engineering
boldtjg@kjww.com
Scott Bowman, PE
LEED AP BD+C
Principal
Corporate Sustainability
Leader
bowmansc@kjww.com
74. Project Costs
• Original project was modest at $127/sf
– Mechanical = $6.62/sf
– Plumbing = $7.98/sf
– Electrical/Technology = $13.30/sf
• Some costs would be required to meet
mandatory portions of 90.1-2010
• Plug load control would be required, so the
energy savings are built into baseline
• Technology has advanced, as well as prices
75. Minimum Additional Costs
LEED v2009 / 90.1-2007
• No changes required to
meet minimum code
• Changes required to meet
LEED Prerequisite
– Daylighting control
• Sensor Controller
• Dimmable Ballasts
• Increase of $0.34/sf, 0.3%
• Payback = 4.3 years
LEED v4 / 90.1-2010
• Changes required to meet
mandatory requirements
– Plug load control
• Occ Sensor Plug Strips
– Daylighting control
• Sensor Controller
• Dimmable Ballasts
• Increase of $0.75/sf, 0.6%
• Payback = 7.4 years
76. Maximum Additional Costs
LEED v2009 / 90.1-2007
• Water Efficiency
– Waterless Urinals
– Pressure Assist Toilets
• Energy Systems
– Enhanced Envelope
• Wall R24 to R30
• Roof R26 to R40
– Reduced Lighting Density
• T5 High Output Lamps
• LED Task Lighting
•
•
•
•
•
Additional Meters
Green Power
IEQ Testing
Low Mercury Lamps
Increase of $2.58/sf, 2.0%
– LEED $0.15/sf, 0.1%
• Payback = 14.7 years
77. Maximum Additional Costs
LEED v4 / 90.1-2010
• Water Efficiency
– Waterless Urinals
– Pressure Assist Toilets
• Site Assessment
• Envelope Commissioning
• Additional Meters
• Energy Systems
– Enhanced Envelope
• Wall R24 to R30
• Roof R26 to R40
– Geothermal Heat Pumps
• 40 tons
– Reduced Lighting Density
• T5 High Output Lamps
• LED Task Lighting
– Water and Energy
•
•
•
•
Green Power
IEQ Testing
Low Mercury Lamps
Increase of $8.89/sf, 7.0%
– LEED $1.28/sf, 1.0%
• Payback = 26 years
78. Cost Summary
LEED v2009 / 90.1-2007
• Silver
– Increase of $0.34/sf, 0.3%
– Payback = 4.3 years
• Gold
– Increase of $2.58/sf, 2.0%
– Payback = 14.7 years
LEED v4 / 90.1-2010
• Not Certified
– Increase of $0.75/sf, 0.6%
– Payback = 7.4 years
• Silver
– Increase of $8.89/sf, 7.0%
– Payback = 26 years