2012 IECC with WA State Amendments COMMERCIAL PROVISIONS LISA - - PDF document
6/3/13 2012 IECC with WA State Amendments COMMERCIAL PROVISIONS LISA ROSENOW N O R T H W E S T E N E R G Y E F F I C I E N C Y C O U N C I L L I S A @ P U T N A M P R I C E . C O M DUANE LEWELLEN L E W E L L E N A S S O C I A T E S
LISA ROSENOW
N O R T H W E S T E N E R G Y E F F I C I E N C Y C O U N C I L L I S A @ P U T N A M P R I C E . C O M
DUANE LEWELLEN
L E W E L L E N A S S O C I A T E S , L L C L E W E L L E N L L C @ G M A I L . C O M
Energy Source Metering Energy End-Use Metering Energy Consumption Measurement
Devices
Data Acquisition Energy Information Display
“What do a building’s energy
meters and an automobile’s gages for speed, gas, oil, water and engine temperature have in common? They control nothing, but provide vital information to help a design engineer or operator maximize equipment operations.”
Recommended resource –
Plourde, Jim. “Making the Case for Energy Metering” ASHRAE Journal, April 2011
“You can’t manage what you can’t measure” and
developed successful techniques for quality control
The purpose of energy metering and energy consumption management
requirements in the 2012 WS IECC is to provide building owners with the means to effectively monitor the energy consumption of their building systems. With this information they can:
Collect energy usage data on their property holdings Make informed building system management decisions Evaluate the efficiency of energy conservation measures Troubleshoot higher than expected energy consumption Diagnose potential system operational issues
Buildings shall be equipped
Required for all buildings
Metering categories:
Section C409.2 –
Section C409.3 –
For existing buildings,
Energy sources:
Electrical energy Natural gas and liquid fuels District energy Site generated renewable energy
Energy source meters shall collect
data for the whole building or each separately metered portion of the building
Energy source metering is not
required where end use metering for an energy source accounts for all usage of that energy type within the building
Solid fuels are not required to be
metered
Electrical energy - All electrical
energy supplied to the building and its associated site. Includes site lighting, parking, recreational facilities, and other areas that serve the building.
Liquid fuels – Includes diesel,
fuel oil and propane
District energy - All net energy
extracted from district steam systems, chilled water loops, hot water systems, or other energy sources serving multiple buildings
Renewable energy - All net
energy generated from on-site solar, wind, geothermal, tidal or
Energy end-use categories
All HVAC systems that provide
space heating and/or cooling, dehumidification and ventilation
Domestic and service water
heating (does not include hot water for space heating)
End-use meters shall collect data for
the whole building or each separately metered portion of the building
Multiple meters may be used for any
end-use category, provided that the data acquisition system totals all of the energy used by that category
Energy to be metered
Electrical, natural gas, liquid fuel,
district steam and district chilled water that is used by boilers, chillers, pumps, fans and other equipment that provides space conditioning and ventilation
Energy that serves process loads,
space water heating or miscellaneous loads does not need to be metered
Various energy end-use exceptions
apply, refer to Section C409.3
Sample energy metering data output – Source: BizEE Energy Lens
Section 409.4 - Measurement
Meters:
Shall have local display or
automatically communicates data to acquisition system
Provides at least hourly data Current sensors or flow meters
are allowed for end-use metering
Source meters shall be digital
Data acquisition:
Shall provide real-time energy
consumption data
Shall store required data for a
minimum of 36 months Energy display shall be:
A readily accessible and visible
A web page, OR An electronic source accessible
directly to building management, OR
Accessible to a third party
service who then makes the information readily accessible to building O&M personnel
Scope Thresholds Documentation Reporting
COMMISSIONING
Commissioning is required for:
Building mechanical systems Service water heating systems Electrical power and lighting systems NEW - Energy metering systems
Prior to passing final inspections or obtaining a
certificate of occupancy, documentation shall be provided to the owner showing that commissioning has been completed per the requirements of Section C408.
Mechanical system
Qualify under the Simple
Systems Path, and
Are not required to have
economizer per Section C403.3.1 – Economizers, and
The building total mechanical
equipment capacity is less than 480,000 Btu/h cooling capacity and 600,000 Btu/h heating capacity. (C408.2)
All other mechanical systems are
required to comply with the commissioning requirements
Service water heating system
The largest service water
heating system capacity in a building is less than 200,000 Btu/h (58,562 W) and there are no pools or in-ground permanently installed spas.
No exceptions for
Commissioning plan
Requirements similar to 2009
WSEC NEW - Preliminary
Identify deficiencies found
during preliminary testing
Deferred tests and required
climatic conditions to complete them
Progress report of operator
training NEW – Acceptance of
The jurisdiction shall receive
notification from the building
Preliminary Commissioning Report was provided to owner.
Figure C408.1.2.1 --
Commissioning compliance checklist satisfies this requirement
Acceptance of preliminary
report is required to pass final inspections
Jurisdiction may request copy
Final commissioning report -
Results of performance testing Air and hydronic system
balancing reports
List of deficiencies found and
corrective measures taken or recommended
Record documents that convey a
record of the alterations to the
O&M manuals for all equipment
requiring maintenance that includes a narrative of how each system is intended to operate
Final report of operator
training - Training shall include documentation review and hands on demonstration of normal and emergency maintenance procedures.
The final commissioning report is
not required for a certificate of
delay due to testing that can only be completed during specific climate conditions.
Refer to specific
Design Loads and System Sizing Mechanical Equipment Efficiency Tables Mechanical System Controls Loading Dock and Parking Garage
Ventilation
Dampers Energy Recovery Duct, Plenum & Shafts Piping Insulation Fan Power Economizers Hydronic System Provisions Variable Air Volume Systems Cooler & Freezer Mechanical Systems Service Water Heating System Provisions
Governs all mechanical
Equipment that are not required
to comply with the provisions of Sections C403 Mechanical Systems–
Those used for manufacturing,
industrial or commercial processes, other than for conditioning spaces or maintaining comfort and amenities for the occupants of the building
Manufacturing, industrial or
commercial process equipment that do have to comply:
Equipment regulated under C403
and C404 performance tables for HVAC and service water heating
Snow melt systems Kitchen hoods and lab exhaust
systems
Piping insulation requirements Electric motors, unless integral to
specialized process equipment
Condenser heat recovery for
service water heating
Walk-in & refrigerated warehouse
coolers and freezers
Similar to 2009 WSEC
C403.2 – Provisions for all applicable mechanical systems C403.3 – Provisions for Simple HVAC Systems & Equipment C403.4 – Provisions for Complex HVAC Systems & Equipment C403.5 & 6 – Mechanical equipment serving walk-in and
Many mechanical system provisions are unchanged or have
Several requirements have been moved from the “Complex
Design load calculations, equipment and system sizing instructions Direct digital control system capabilities Exhaust system requirements for kitchen hoods and laboratory
systems
Energy recovery from ventilation, condensate and condenser systems Heat rejection equipment Variable flow controls Large volume fan systems Electric motor efficiency
Approved methods of
Maximum of 70°F 72°F for heating and minimum of 75°F for cooling
Outdoor design temperatures per Appendix C
Heating and cooling loads shall
be adjusted to account for load reductions achieved with energy recovery systems per ASHRAE HVAC Systems and Equipment Handbook
Equipment and system
Output capacity of heating
and cooling equipment and systems shall not exceed the loads calculated per the approved load calculation method
The 150% rule is no
longer allowed 2009 WSEC allowed systems to be sized up to 150% of the design load
Exceptions
A single piece of equipment that
provides both heating and cooling may satisfy the calculated load for just one function (heating or cooling). The equipment capacity for the other function shall be as small as possible, within available equipment options.
Multiple units of the same
equipment type with combined capacities exceeding the design load provided they have controls that sequence the operation of each unit based on actual load demand. Example – Part load chillers
Standby equipment
Minimum efficiency tables have been added for the
Table C403.2.3(1)B –Air Conditioners and Condensing Units Serving
Computer Rooms
Table C403.2.3(1)C –Electrically Operated Variable Refrigerant Flow
Air Conditioners
Table C403.2.3(1)D – Electrically Operated Variable Refrigerant
Flow Air-to-Air and Applied Heat Pumps
Table 404.2 – Service Water Heating Equipment
T H E R M O S T A T I C C O N T R O L S O F F - H O U R A N D O P T I M U M S T A R T C O N T R O L S O C C U P A N C Y - B A S E D C O N T R O L S L O A D I N G D O C K A N D P A R K I N G G A R A G E V E N T I L A T I O N S N O W M E L T S Y S T E M C O N T R O L S
Zone and system level
The supply of heating and
cooling energy to each system zone shall be controlled by individual thermostatic controls capable of responding to temperature within the zone
At a minimum, each floor of
a building shall be considered as a separate zone
Systems required to have
economizers and serving single zones shall have multiple cooling stage capability that activates the economizer as the first stage
NEW - Where
humidification or dehumidification or both is provided, at least one humidity control device shall be provided for each humidity control system
NEW - Independent perimeter systems
Systems designed to offset building envelope
heat losses or gains may serve multiple perimeter zones and be controlled by a single thermostat provided:
for each building exposure having exterior walls facing only one orientation (within +/-45°) for more than 50 contiguous feet; AND
be located within the zones served by the system
Photo Source – AHRI Photo Source - Zehnder
Off-hour controls
Includes requirements for
thermostatic setback, automatic setback and shutdown, and automatic start capabilities
Exceptions (REVISED) -
continuously
Btu/h (2 kW) that have a readily accessible manual shutoff switch
Setback – Each zone shall have
automatic thermostatic setback capability that is controlled by either an automatic time clock or programmable control system. Setback temperature capability shall be down to 55° F and up to 85° F.
Automatic start – Automatic
start controls shall be provided for all HVAC systems (systems > 2,000 CFM). Controls shall be capable of automatically adjusting the daily start time of the system to bring each space to the design occupied temperature immediately prior to occupancy.
Group R-1 hotels & motels
No changes from 2009 WSEC Setback controls are required
for mechanical systems serving guest rooms when unoccupied
Applies to room based or whole
building systems
Minimum 5° F setback in
winter and setup in summer
Provide by one of the following:
room access – key, card, deadbolt, etc
Also required to control room
lighting
Photo Source – Speed Key
Group R-2 and R-3 dwelling
A programmable thermostat is
required for the primary space conditioning system of each dwelling unit
Thermostat shall be capable of
5-2 programmable scheduling (weekdays/weekends) that includes at least 2 setback periods per day
Exceptions include primary
systems controlled by
manual timer (with 2 hour limit), or ductless heat pumps Group R-2 sleeping units
Requirements are identical
to Group R-2 and R-3 dwelling units
One additional exception -
Zones with a full HVAC load demand not exceeding 3,400 Btu/h (1 kW) and having a readily accessible manual shutoff switch
Photo Source – Honeywell
Requirements now listed under “Occupancy Sensors” - Was under
Required in all classrooms, gyms, auditoriums and conference
Occupancy sensor controls shall either close outside air dampers
Not required if space is equipped with another means to
NOTE – “Ventilation Controls for High-Occupancy Areas” has
Required for loading docks
Gas sensors Occupancy sensors
Required for enclosed
Gas sensors only Exception – Ventilation
system with total design capacity under 8,000 cfm may use occupancy sensors
Automatic time clocks are
no longer a compliance
System control methods
Gas sensor system
carbon monoxide (CO) sensors set to maintain levels
million (ppm), in conjunction with,
nitrogen dioxide (NO2) sensors set to maintain levels
for 8 hour exposure
Occupancy detection sensors -
System shall detect entry along vehicle and pedestrian pathways
Controls for snow- and ice-melting systems, supplied through
Automatic shut-off controls for when pavement temperature is above
50°F and no precipitation is falling, AND
Automatic or manual
controls that allows shut-off when outdoor temperature is above 40°F
Photo Sources – M&T Mechanical and Power Radiant Floor Heat, Canada
B U I L D I N G A I R L E A K A G E M A N A G E M E N T D A M P E R C O N T R O L S
Damper requirements are located under Building Envelope
C402.4.5.1 - Stairway and shaft vents C402.4.5.2 - Outdoor air intakes and exhaust C403.2.4.4 - Shutoff damper controls
Outdoor air supply and exhaust ducts shall be
Operation of dampers is allowed during
Outdoor air intakes and
Outdoor air supply intake,
exhaust openings and relief
Class IA motorized dampers which close automatically when the system is off. Return air dampers shall also be equipped with motorized dampers.
Damper maximum leakage rate
is 4 cfm/ft2 at 1” w.g. per AMCA 500D.
There are a few exceptions to
the motorized damper requirement.
When allowed, gravity
dampers (nonmotorized) for ventilation air intakes shall be protected from direct exposure to wind. A common cause for a
Gravity (nonmotorized)
Relief dampers serving systems
with less than 5,000 cfm total supply airflow in buildings less than 3 stories above grade
Group R occupancies where the
design intake or outlet capacity does not exceed 400 cfm Allowed gravity damper
Up to 20 cfm/ft2 at 1” w.g. Gravity dampers smaller than
24” in either dimension are permitted to have a leakage rate of 40 cfm/ft2 at 1”w.g. Stairway and shaft vents
Vents shall be provided with
Class 1 motorized dampers with maximum leakage rate
AMCA 500D.
V E N T I L A T I O N S Y S T E M S C O N D E N S E R A N D C O N D E N S A T E S Y S T E M S ( R E Q U I R E M E N T S U N C H A N G E D )
Air-to-Air Systems Heat Pipe Run Around Loop
Any system with minimum outside air requirements at design conditions
greater than 5,000 CFM or any system required by Table C403.2.6 shall include an energy recovery system
The aggregate outside air (cfm) of units serving a single space shall be used
in applying this requirement
2009 WSEC fan system energy recovery general requirements unchanged Table C403.2.6 – Energy Recovery Requirement
An energy recovery ventilation
Multi-zone systems with cold
deck supply air and zone reheat where the minimum outdoor air is less than 70% of total supply air
Systems for residential
multifamily spaces where air exhausted at any single location is less than 25% of the design outdoor air flow rate
Where energy recovery systems
are prohibited by IMC
Systems requiring
dehumidification that have energy recovery in series with the cooling coil
Laboratory fume hood systems
that comply with the exception details - includes requirements for:
controls
label no longer required
exceptions still applicable
I N S U L A T I O N S E A L I N G T E S T I N G
Outside air ducts, shafts and plenums Supply and return air ducts and plenums Duct sealing – Low, medium and high pressure Duct testing
WS IECC requirements are comparable to 2009 WSEC
Ducts, shafts and plenums
Comply with all applicable
air leakage and building envelope insulation requirements in the Building Envelope section
Comply with all applicable
building envelope vapor control requirements from the IBC
Insulation and vapor
retarder shall extend continuously from the building exterior to an automatic shutoff damper or heating or cooling equipment
Duct surfaces shall meet the
insulation R-value requirements for metal framed walls (Building Envelope - Table C402.1.2)
2009 WSEC requirements
Outside air duct with R-7
insulation that serves an air handler that has less than 2,800 cfm of supply air capacity
Unheated equipment rooms
with combustion air louvers, provided they are isolated from conditioned space at sides, top and bottom of the room with R-11 nominal insulation
Insulation requirements
If located within the building envelope assembly, the duct or plenum
shall be separated from the building exterior (or unconditioned or exempt space) by insulation as required for exterior walls under Building Envelope Section C402.2.3
Insulation Exception - Where the design temperature difference
between the interior and exterior of the duct or plenum does not exceed 15° F
Supply ¡& ¡Return ¡Ductwork ¡and ¡Plenums ¡ Required ¡ insula9on ¡ Located ¡in ¡uncondi7oned ¡spaces ¡ R-‑7 ¡R-‑6 ¡ Located ¡outdoors ¡ R-‑7 ¡R-‑8 ¡ Located ¡within ¡condi7oned ¡space: ¡ ¡Supply ¡air ¡ temperature ¡< ¡55° ¡F ¡or ¡> ¡105° ¡F ¡ R-‑3.3 ¡
Pressure Classifications
Low pressure: ≤ 2” w.g. Medium pressure: > 2” w.g.
and < 3” w.g.
High pressure: ≥ 3” w.g. Pressure classification of all
ductwork shall be clearly noted on drawings Sealing
Joints and seams shall be
joined and sealed per the requirements defined in Section 603.9 of the IMC Leak Testing
Only high pressure duct
systems are required to be tested. Low pressure duct system testing requirements in 2009 WSEC have been removed.
Test representative sections
totaling at least 25% of the total duct area
Test per SMACNA HVAC Air
Duct Leakage Test Manual
Tested air leakage rating
shall be ≤ 6.0 CL. Refer to Section C403.2.7.3.3 for calculation procedure, which is different than 2009 WSEC.
Pipe insulation
Protection of exterior pipe
Piping insulation exposed to
weather shall be protected from damage, including that due to solar radiation, moisture, equipment maintenance and wind
Adhesives tape is not
permitted Exceptions to table
Factory-installed piping
within HVAC equipment, including fan-coils and unit ventilators
Piping that conveys fluids
that have not been heated or cooled through the use of fossil fuels or electric power
Strainers, control valves, and
balancing valves associated with piping < 1-inch
Direct buried piping that
conveys fluids at or below 60°F
Photo Sources – Airex, Poly Guard Products, All-American Insulation
Table C403.2.8 -- Minimum Pipe Insulation Thickness (in inches)
Fluid ¡Opera9ng ¡ Temperature ¡ Range ¡and ¡ Usage ¡(°F) ¡ Insula9on ¡Conduc9vity ¡ Nominal ¡Pipe ¡or ¡Tube ¡Size ¡(inches) ¡ Conduc9vity ¡ Btu*in. ¡/ (h*P2*F) ¡ Mean ¡Ra9ng ¡ Temperature, ¡ *F ¡ < ¡1 ¡ 1 ¡to ¡< ¡1-‑1/2 ¡ 1-‑1/2 ¡to ¡< ¡4 ¡ 4 ¡to ¡< ¡8 ¡ ≥ ¡8 ¡ > ¡350 ¡ 0.32 ¡-‑ ¡0.34 ¡ 250 ¡ 3.0 ¡4.5 ¡ 3.5 ¡5.0 ¡ 3.5 ¡5.0 ¡ 4.5 ¡5.0 ¡ 4.5 ¡5.0 ¡ 251 ¡-‑ ¡350 ¡ 0.29 ¡-‑ ¡0.32 ¡ 200 ¡ 2.0 ¡3.0 ¡ 3.0 ¡4.0 ¡ 3.5 ¡4.5 ¡ 3.5 ¡4.5 ¡ 3.5 ¡4.5 ¡ 201 ¡-‑ ¡250 ¡ 0.27 ¡-‑ ¡0.30 ¡ 150 ¡ 2.0 ¡2.5 ¡ 2.0 ¡2.5 ¡ 2.5 ¡ 2.5 ¡3.0 ¡ 2.5 ¡3.0 ¡ 141 ¡-‑ ¡200 ¡ 0.25 ¡-‑ ¡0.29 ¡ 125 ¡ 1.5 ¡ 1.5 ¡ 1.5 ¡2.0 ¡ 2.0 ¡ 2.0 ¡ 105 ¡-‑ ¡140 ¡ 0.22 ¡-‑ ¡0.28 ¡ 0.21 ¡-‑ ¡0.28 ¡ 100 ¡ 1 ¡ 1 ¡ 1.5 ¡ 1.5 ¡ 1.5 ¡ 40 ¡-‑ ¡60 ¡ 0.22 ¡-‑ ¡0.28 ¡ 0.21 ¡-‑ ¡0.27 ¡ 100 ¡75 ¡ 1.0 ¡0.5 ¡ 1.0 ¡0.5 ¡ 1.5 ¡1.0 ¡ 1.5 ¡1.0 ¡ 1.5 ¡1.0 ¡ < ¡40 ¡ 0.22 ¡-‑ ¡0.28 ¡ 0.20 ¡-‑ ¡0.26 ¡ 100 ¡75 ¡ 1.0 ¡0.5 ¡ 1.5 ¡1.0 ¡ 1.5 ¡1.0 ¡ 1.5 ¡1.0 ¡ 2.0 ¡1.5 ¡
F A N F L O O R H O R S E P O W E R L I M I T S F A N M O T O R H O R S E P O W E R L I M I T S
Allowable fan floor hp
Total fan power of each HVAC
system at design conditions shall not exceed allowable limits per Table C403.3.10.1(1)
Exceptions include:
systems that utilize flow control devices to maintain space pressurization
shall have electronically commutated motors (ECM) or 70% motor efficiency. A few exceptions apply.
Total fan power requirements
apply to supply fans, return/ relief fans, and fan-powered terminal units associated with systems providing heating or cooling capability.
Single zone VAV systems shall
comply with the constant volume fan power limitations. Motor nameplate horse
For each fan, the selected fan
motor shall be no larger than the first available motor size greater than the bhp.
Table C403.3.10.1(1) -- Fan Power Limitation
A = Adjustments per Table C403.3.10.1(2)
Table C403.3.10.1(2) -- Fan Power Limitation Pressure Drop Adjustment
E L I G I B I L I T Y C R I T E R I A Q U A L I F Y I N G S Y S T E M T Y P E S E C O N O M I Z E R R E Q U I R E M E N T S
Eligibility requirements
Applies to unitary and
packaged HVAC systems
Systems must serve only one
zone and are controlled by a single thermostat in the zone served
No simultaneous heating and
cooling or active humidification Qualifying system types
Same types and capacity
limits as defined in WSEC
NEW – Also applies to two-
pipe heating systems serving
cooling system is installed
Qualifying heating water
systems with output capacity
shall comply with all Complex Systems hydronic system control requirements
Each qualifying simple
Air economizers on simple
systems with cooling capacity greater than 65,000 Btu/h shall have integrated economizer controls
High-limit shutoff types and
controls setting requirements are specified in Table C403.3.1.1.3 (under Complex Systems) These exceptions are now
Qualifying small equipment Systems with dehumidification
that affect other systems
NOTE - C403.3.1 Exception 4
does not apply to WA State
Qualifying Group R cooling
E C O N O M I Z E R R E Q U I R E M E N T S H Y D R O N I C S Y S T E M C O N T R O L S V A R I A B L E - A I R - V O L U M E S Y S T E M S C O O L E R A N D F R E E Z E R M E C H A N I C A L S Y S T E M S
G E N E R A L R E Q U I R E M E N T S H I G H L I M I T S H U T - O F F E X C E P T I O N S
As the baseline, all complex
Integrated economizer
Exceptions to integrated include -
Direct-expansion systems with
capacity less than 54,000 btu/h
Direct-expansion systems with
controls that prevent coil frosting at the lowest step of compressor unloading, provided this step is no greater than 25% of the system capacity
Economizer operation cannot
Requirements for water
Design capacity Maximum pressure drop Integrated economizer
capability and impact to building heating requirements apply to water economizer systems as well
Air economizers shall automatically reduce outdoor air intake to
Electronic enthalpy controllers are devices that use a combination of
humidity and dry-bulb temperature in their switching algorithm
Fixed enthalpy controllers are prohibited in WA State Climate Zones
Table C403.3.1.1.3(1) -- High-limit Shutoff Control Options for Air Economizers
Table C403.3.1.1.3(2) -- High-limit Shutoff Control Setting for Air Economizers
These exceptions are only
Chilled beam and chilled
ceiling space systems served by water economizer
High efficiency water-source
heat pump systems
Chilled water terminal units
served by chilled water generation equipment with IPLV ratings >25% better than table values
Applicable variable refrigerant
flow (VRF) systems
Equipment used to cool
dedicated server rooms, electronic equipment rooms or telecom switch rooms that comply with one of the options under this exception
Exceptions no longer available
Systems with special OSA
filtration requirements
Site-recovered cooling capacity
Qualifying Group R cooling
equipment exception is applicable for both Simple and Complex Systems
B O I L E R & P I P I N G S Y S T E M R E Q U I R E M E N T S W A T E R - L O O P H E A T P U M P S Y S T E M S P A R T - L O A D C O N T R O L S
Boiler requirements
Single boilers with capacity
> 500,000 Btu/h input design capacity shall have either a multi-staged or modulating burner
Multiple-packaged boilers
that deliver hot water or steam to a common distribution system shall have automatic controls that sequence boiler operation Hydronic piping system
3-pipe systems are
prohibited
2-pipe changeover systems
are allowed. Specific deadband controls, changeover temperature, and minimum time period in heating or cooling mode prior to changeover apply.
Photo source – Tekmar Controls
Water-loop heat pump
Deadband - Systems with a
common heat pump water loop shall have a 20° F deadband between heat addition and heat rejection modes
Heat rejection - A heat
exchanger shall be provided to isolate the cooling tower from the heat pump loop. Simplified (fewer options) than 2009 WSEC.
Heat pump isolation
requirements unchanged
Part load controls not required
Hydronic system part load
Heated or chilled water
systems with > 300,000 btu/h capacity shall have:
unchanged from 2009 WSEC
flow by at least 50% using adjustable speed drives or multi-stage pumps. This requirement only applies to hydronic systems with pump system capacity > 3 hp.
A supply air system serving multiple zones shall be a VAV
During periods of occupancy the system shall reduce primary air
supply to each zone before reheating, recooling or mixing
Approved methods:
the total system supply airflow rate
WSEC
Exceptions
Zones where special humidity levels are required to satisfy process
needs
Zones where air volume to be reheated, recooled or mixed is no
greater than the volume of outside air required to meet ventilation requirements
75% of the energy for reheating or for providing warm air in mixing
systems is provided from a site-recovered or site-solar energy source
Additional exceptions apply
Hospital and lab systems that serve multiple zones, including
Mechanical systems that
Requirements apply to:
Anti-sweat heaters Evaporator fan motors Condenser fan motors
Additional requirements
System requirements
Anti-sweat heaters without
controls shall draw ≤ 7.1 watts/ sf of door opening for walk-in freezers, and 3.0 watts/sf for walk-in coolers
Anti sweat heaters shall operate
based on relative humidity of air
Evaporator fan motors that are
< 1 hp and < 460 volts shall have ECM or 3-phase motors
Condenser fan motors that are
< 1 hp shall use ECM, permanent split capacitor type,
E Q U I P M E N T E F F I C I E N C Y S Y S T E M C O N T R O L S P I P E I N S U L A T I O N M E T E R I N G
Requirements for
Temperature controls Shut-off controls Heat traps Water heater and
Domestic hot water
Water heater
Photo Source – Bradford White & Rheem
Temperature controls:
Temperature setting
requirements under review Heat traps
Water-heating equipment
serving non-circulating systems without integral heat traps shall have heat traps on the supply and discharge piping Dwelling unit domestic hot
Required for Group R multi-
family buildings with central hot water service Pipe insulation
Automatic-circulating hot water
and heat-traced systems –
See section for additional
requirements & exceptions
Circulation/heat trace controls
Circulating hot water system
pumps or heat trace shall turn
when there is limited hot water demand
They shall also have automatic
time switches or other controls to turn off the system during periods of nonuse
Building energy efficiency related news
2012 WS IECC Commercial Compliance
Fact sheets, presentations, webinars Email and telephone technical support
Technical Support Coordinator
Lisa Rosenow - (206) 624-0283
Website – www.neec.net
LISA ROSENOW
N O R T H W E S T E N E R G Y E F F I C I E N C Y C O U N C I L L I S A @ P U T N A M P R I C E . C O M
DUANE LEWELLEN
L E W E L L E N A S S O C I A T E S , L L C L E W E L L E N L L C @ G M A I L . C O M