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Commissioning for the 2015 IECC Code Lunch & Learn Presentation O’Connell Robertson - TEMA March 10, 2016
Commissioning for the 2015 IECC Code
Lunch & Learn Presentation O’Connell Robertson - TEMA March 10, 2016
Learning Objectives
Impact of Statewide Change from IECC 2009 to IECC 2015
At the end of this program, participants will be able to:
• Better informed about the history
• Understand what is driving the need for commissioning (Cx)
– The buildings and systems affected
– What is required, what is voluntary
• Better determine best method for Cx procurement
• Believe!
Why? A brief history.
1982
Why? A brief history.
1982 • ASHRAE convened a committee
to Cx best practices
Why? A brief history.
1982 • ASHRAE convened a committee
to Cx best practices • ET released in summer
Why? A brief history.
1982 • ASHRAE convened a committee
to Cx best practices • ET released in summer • Rocky fights Mr. T
Why? A brief history.
1985 • Rocky brings down the USSR by
defeating Ivan Drago
Why? A brief history.
1985 • Rocky brings down the USSR by
defeating Ivan Drago 1986 • Reagan tells Gorbachev to tear
down the wall
Why? A brief history.
1985 • Rocky brings down the USSR by
defeating Ivan Drago 1986 • Reagan tells Gorbachev to tear
down the wall 1989 • Berlin wall comes down
Why? A brief history.
1985 • Rocky brings down the USSR by
defeating Ivan Drago 1986 • Reagan tells Gorbachev to tear
down the wall 1989 • Berlin wall comes down • You finally start to reconsider your
mullet
Why? A brief history.
1985 • Rocky brings down the USSR by
defeating Ivan Drago 1986 • Reagan tells Gorbachev to tear
down the wall 1989 • Berlin wall comes down • You finally start to reconsider your
mullet • ASHRAE publishes Guideline 0 –
The Commissioning Process
Why? A brief history.
• Guideline 0 – Discusses the process but not
specific systems – Encourages implementing Cx
at Pre-design – Guideline is written around
ensuring that the objectives laid out in the OPR are satisfied
– Cx continues into the occupancy period with surveys
Next stop: Code Implementation • Over next 20+ years other Cx guidelines by:
– AABC – ASHRAE 1.1 – GSA – NEBB – BCxA – ASHE
• In 2009 Cx is required: – LEED 2009 –
• Breaks Cx into mandated Fundamental (construction) & optional Enhanced (pre-design)
– ASHRAE 90.1 – 2010 • Cx of buildings over 50,000sf
– IECC 2012 – • Cx Required for Mech > 40T & Elec
– IECC 2015 – • Cx requirements expand to circ pumps
Why Energy Codes?
2009 IECC to 2015 IECC
• 2009 IECC – April 1, 2011
• 0.25” Thick
2009 IECC to 2015 IECC
• 2015 IECC – Nov. 1, 2016
• 0.45” Thick
2009 IECC to 2015 IECC
• Mechanical
– Min efficiency rise
– R5 to R6 indoor insulation
– Energy recovery on systems > 2500 cfm and >10% OA
• with smaller systems having higher allowable % OA
– Either waterside or airside economizers with few exceptions (DX<5T)
2009 IECC to 2015 IECC
• Controls
– 7-day programmable still allowed but additional features operations required not remotely accessible
– Economizer must be: 1.) fixed dry bulb, 2.) fixed enthalpy/dry bulb, or 3.) diff enthalpy and fixed dry bulb
– DCV for systems serving medium density (>25ppl/1000 SF) rooms over 500 SF
– CHW and HW loop temp resets.
– Variable speed pumping systems > 10HP
– Fans ≥ 7.5HP to vary speed. Low speed NMT 2/3 full speed.
2009 IECC to 2015 IECC
• Electrical
– Most spaces lights on occ sensor with few exceptions for emergency egress
– Increased daylighting responsive auto controls
• Additional Efficiency – Six additional efficiency or controls options for Mechanical and
Electrical (building must comply with 1)
• Plumbing – Circ pumps to be automatically shut off on temp and demand
2009 IECC to 2015 IECC
• Commissioning (New requirement as of 2012 IECC) – Required for buildings with cooling load over 40T – Similar to 2012 IECC but with circ pumps added
Why Cx?
• Systems are getting more complex
– More energy recovery
– More economizers
• Controls schemes are more complex
– Cannot get there on raw efficiency increases
– Want to deliver energy only as much and where needed
• Commissioning can ensure the building operates as intended
Next stop: Owner Implementation
Path 1: • Allow contractor to select
and mange – May be better option if
owner does not have manpower to support CxA efforts
– Required by code and likely to get minimum services
What is required?
• Registered professional provides evidence
• Cx HVAC (select systems only)
• TAB
• O&M
• Functional test lighting controls
• Sampling allowed for identical spaces
• Functional test circ pumps
Cx Payback in… New Buildings: 4.2 years Existing Buildings: 1.1 years
Next stop: Owner Implementation
Next stop: Owner Implementation
What not to expect when doing the minimum code required Cx. • Plan & spec review of milestone design submittals (SD, DD, %CD) • CxA support for writing OPR • Specifications tailored to project • Installation review(s) • Submittal review(s) • System trending • Re-commissioning through warranty • Continuous Commissioning Plan
Next stop: Owner Implementation Path 2: • Owner Provided and/or Selected.
– Can add additional requirements
– CxA acts as an owner advocate
– CxA better understands owner’s expectations
– Owner can make more informed contractor payments as job winds down
– Commissioning specifications better represent the work to be completed on the project
– O&M personnel may be better utilized
Who can commission?
• Registered professional or approved agency for Mech & Plumbing
• For lighting, the registered design professional must provide evidence that systems were tested.
Next stop: Code Implementation
Examples
• VAV boxes simultaneously auto-calibrating
• Causing AHU to shut down on high static pressure
• Critical care AHU in a hospital
Examples
• Relief fan operating on economizer mode
• Setpoint as designed too close to non-economizer mode setpoint
• PID loop not tuned correctly
Examples
Examples
