Changes to the Minnesota Commercial Energy Code - MN …...efficiency, and as necessary, updated their code to meet or exceed Standard 90.1- 2010.” See 76 Federal Register 202 (October

Presented by: Andy Thielen, PE

Changes to the Minnesota Commercial Energy Code

Warning!

• The following is an outline of proposed code changes. There is no guaranteethat the final code adopted by the State of Minnesota will resemble what hasbeen proposed and/or outlined in the following.

• It is unknown when this code will be adopted by the State of Minnesota.

(Work began in 2006 on the current version of the energy code which was adoptedin 2009.)

2

What is an Energy Code?

• Energy codes are a subset of the Minnesota State Building Code, whichestablish baseline requirements and govern building construction in Minnesota.

• Energy codes set minimum efficiency requirements for the design of new andrenovation of existing buildings, assuring reductions in energy use and emissionsover the life of the building.

3

Who mandates the Energy Code?

The U.S. Department of Energy (DOE), through the Building Energy Codes Program(BECP), supports energy efficiency in buildings through the development andimplementation of model codes and standards. DOE also provides technicalassistance to states and localities as they adopt and enforce energy codes.

Model Energy Codes include, but are not limited to:• ICC’s International Energy Conservation Code (IECC)• ASHRAE’s Energy Standard for Buildings Except Low-rise Residential

Buildings (90.1).

4

How do the individual States, like Minnesota, become involved?

• The Federal Government requires individual states to “certify that they havereviewed the provisions of their commercial building code requiring energyefficiency, and as necessary, updated their code to meet or exceed Standard90.1- 2010.”

See 76 Federal Register 202 (October 19, 2011).

• Minnesota first adopted an Energy Code for Buildings in 1974 and, with severaleditions since that time, currently has adopted the ASHRAE Standard 90.1(2004) with amendments.

See Minnesota Rules Chapter 1323 (2009).

5

What is Minnesota doing to comply?

Most recently, the Federal Government has mandated that each State filecertifications of review by October 18, 2013.

• In an effort to certify, a Commercial Energy Code Advisory Committee wasformed to recommend changes to the Code. These recommendations havebeen made.

• Final decisions regarding the changes, if any, to the current rules, will bemade by either an Administrative Law Judge or the Commissioner of Laborand Industry. (Unknown time frame)

(Expect Minnesota to ask for an extension).

6

Historically:• As low as 68°F max heating design• As high as 78°F min cooling design

Proposed: (IECC Section C302.1)• Heating load interior design temperature: 72°F max.• Cooling load interior design temperature: 75°F min.

Interior Design Conditions

7

Interior Design Conditions

C302.1 Exception: (For Minnesota) Spaces that require different indoor designtemperatures due to the requirements of processes or functions occurring withinthose spaces, as approved by Authority Having Jurisdiction (AHJ).

Examples:• Surgical Rooms• Clean rooms• Nursing Homes• Process requirements

8

DOE Climate Zones will be used to determine envelope and efficiency requirements

9

Three Proposed Compliance Paths (New Buildings)

C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)

C401.2.2 (which requires)

401.3 (Commercial Parking Garages)

402 (Building Envelopes)

403 (Building Mechanical Systems)

404(Service Water Heating)

405(Electrical Systems)

406 (One subsection from)

406.2 (HVAC Performance)406.3 (Lighting System)

406.4 (Supply of Renewable Energy)

C401.2.3

10


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)










C401.2.3

11


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)










C401.2.3

12


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)










C401.2.3

13

“Shall be a minimum of 7 feet between doors in closed position.”Exceptions

• Doors in buildings less than four stories above grade.• Doors not intended to be used as a building entrance door, such as

mechanical or electrical equipment rooms.• Doors in building entrances with revolving doors

Current Vestibule Requirements

14

C402.4.7 Vestibules

• ALL Building entrances will require vestibules.• Installation of revolving door does not eliminate the requirement for a

vestibule at non revolving doors.• No distance requirement between doors (except for ADA)

Exceptions:Doors not intended to be used by the public, such as doors to mechanical or electrical equipment rooms, or intended solely for employee use…

15

Proposed: IECC C402Summary:

• More stringent requirements for the placement and detailing of the air barrier.• Building envelope insulating values have increased.• Building fenestration “U” values and SHGC’s are lower.

Building Envelope

16

17

18

19

20


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)




403 (Building Mechanical

Systems)






C401.2.3

21

C403.1 Mechanical systems and equipment serving the building heating, cooling or ventilation needs shall comply with Section C403.2 and either:1. Section C403.3 (Simple systems)

1. 10 pages of tabulated equipment efficiencies2. Section C403.4 (Complex Systems)

1. Economizers, VAV systems, Hydronic (3 pipe and 2 pipe change over systems), Heat rejection equipment fan speed control, Heat recovery for service water heating & hot gas bypass (limited to designs with multiple capacity steps)

Building Mechanical Systems

22

C403.2.1 Calculation of heating and cooling loads. Design loads shall be determined in accordance with the procedures described in ANSI/ASHRAE/ACCA Standard 183.


23

C403.2.2 Equipment and system sizing. The output capacity of heating and cooling equipment and systems shall not exceed the loads calculated in accordance with Section C403.2.l.

Exceptions:1. Required standby equipment …2. Multiple units of the same equipment type with combined capacities

exceeding the design load and provided with controls that have the capability to sequence the operation of each unit based on load.

3. Heating and cooling equipment sizing may be up to 10% greater than the calculated peak heating and cooling loads to allow for building pickup and cool down after temperature set back. (proposed amendment)


24

Summary:• Warm air furnace efficiency requirements are unchanged.• Hot water boiler efficiency requirements have increased slightly for boilers

over 300,000 Btuh.• Steam boiler efficiency requirements have increased slightly for some

sizes.• Some required efficiencies are thermal efficiency, and some are combustion

efficiency.

Table 403.2.3(4) & (5)Warm Air Furnaces and

Gas-and Oil-Fired Boilers

25

Summary:

• More breakdown in chiller sizes.• Efficiency requirements in new code are stated as EER for air cooled

chillers, kW/ton for water cooled chillers, and COP for absorption chillers.• New code efficiency requirements are very similar to old code, but IPLV

values now included.• Water cooled chillers have two paths for satisfying efficiency:

• Path A: Lower full load EER, higher IPLV.• Path B: Higher full load EER, lower IPLV.

Table 403.2.3(7) Water Chilling Packages

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Summary:• Includes cooling towers, fluid coolers, and air cooled condensers.• Now includes closed circuit cooling towers.• Requirements of new code are essentially the same as existing code. For

example, for open circuit cooling tower:• Existing code performance requires: 38.2 gpm/HP.• New code performance requires: > 38.2 gpm/HP.

• Similarly for other heat rejection equipment.

Table 403.2.3(8)Heat Rejection Equipment

27

Summary:There are some mechanical equipment efficiency requirements that are in ASHRAE 90.1-2010 that are not included in IECC 2012. It is proposed to add these:

• Electrically Operated Variable Refrigerant Flow Air Conditioners.• Electrically Operated Variable Refrigerant Flow Air-to-Air and Applied Heat

Pumps.• Air Conditioners and Condensing Units Serving Computer Rooms.

C403.2.3 Proposed:Additional Mechanical Equipment

28

Current: Different requirements for < 20,000 cfm and > 20,000 cfm. • 1000 cfm system Name Plate HP < 1.2

Proposed: • Same requirements for all cfm.• Allowable fan power has decreased for <20,000 cfm systems.

• 1000 cfm system: Name Plate HP < CFM X 0.0011 < 1.1 HP• BHP method allows for restrictions in the system, including:

• Scrubbers.• Air filters.• Exhaust filters.• Sound attenuators.

• Amendment allows for preheat coils and air blenders used in Minnesota’s climate.

C403.2.10.1 Proposed:Fan Power Limitations

29

Current:

90.1 6.4.3.8 … a design occupancy for ventilation of greater than 40 people per1000 ft2 of floor area and served by systems with one or more of the following:

• an air-side economizer• automatic modulating control of the outdoor air damper,• a design outdoor airflow greater than 3,000 CFM

C403.2.5.1 Demand Controlled Ventilation (DCV)

30

C403.2.5.1Demand Controlled Ventilation (DCV)

Proposed (more restrictive):

…average occupant load of 25 people per 1,000 ft2 and served by systems withone or more of the following:

• Air-side economizer.• Automatic modulating control of outdoor air damper.• Design outdoor airflow greater than 3,000 cfm.

Exceptions.• Energy recovery• Multiple dumb (i.e. lacks central DDC) zones• Systems under 1,200 cfm Outdoor Air

31

Current:

Requires exhaust air heat recovery for systems over 5,000 cfm with a minimumoutdoor air supply of 70%.

Proposed:

C403.2.6Energy Recovery Ventilation Systems

32

Exceptions1. Where energy recovery systems are prohibited by the International Mechanical

Code.2. Laboratory fume hood systems that include at least one of the following features:

2.1. Variable-air-volume hood exhaust and room supply systems capable ofreducing exhaust and makeup air volume to 50 percent or less of designvalues except where higher volumes are required to maintain safe operatingconditions.

2.2. Direct makeup (auxiliary) air supply equal to at least 75 percent of theexhaust rate, heated no warmer than 2°F above room setpoint, cooled to nocooler than 3°F below room setpoint, no humidification added, and nosimultaneous heating and cooling used for dehumidification control.

3. Systems serving spaces that are heated to less than 60°F and are not cooled.

C403.2.6 Energy Recovery Ventilation Systems

33

Exceptions (continued).

4. Where more than 60 percent of the outdoor heating energy is provided fromsite-recovered or site solar energy.

5. Cooling energy recovery in Climate Zones 3C, 4C, 5B, 5C, 6B, 7 and 8.6. Systems requiring dehumidification that employ energy recovery in series

with the cooling coil. (supermarket)7. Where the largest source of air exhausted at a single location at the building

exterior is less than 75 percent of the design outdoor air flow rate.(You can avoid an ERV by using 2 exhaust fans exhausting 50% of the airflow each)


34

Exceptions.(continued).

8. Systems expected to operate less than 20 hours per week at the outdoor airpercentage covered by Table C403.2.6

9. Systems exhausting toxic, flammable, paint, or corrosive fumes or dust.10. Commercial kitchen hoods used for collecting and removing grease vapors

and smoke.• Not allowed by the IMC (i.e. nothing in the ductwork)• “Dragon Fyre” Energy recovery system installs in the hood.


35

C403.2.9 Mechanical systems commissioning andcompletion requirements.Mechanical systems shall be commissioned andcompleted in accordance with Section C408.2.

Proposed System Commissioning

36

Current:

Required on all systems 3,000 cfm or greater capacity.• (Approximately 72,000 Btuh)Exceptions:

• 9 exceptions

Economizers

37

Proposed: Requires either an air or water economizerExceptions:

1. Individual fan-cooling units with a supply capacity less than 33,000Btuh• Changes from 72,000 Btuh

2. Where more than 25 percent of the air designed to be supplied by thesystem is to spaces that are designed to be humidified above 35°Fdew-point temperature to satisfy process needs.• No Change

3. Systems that serve residential spaces where the system capacity is lessthan five times the requirement listed in Table C403.3.l (1).• < 6600Btuh

C403.3.1Economizers

38

Exceptions (continued)

4. Systems expected to operate less than 20 hours per week.• No Change from current code

5. Where the use of outdoor air for cooling will affect supermarket openrefrigerated casework systems.• No Change from current code

6. Where the cooling efficiency meets or exceeds the efficiencyrequirements in Table C403.3.1(2).• Southern Climates - does not apply to MN

C403.3.1Economizers

39


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)










C401.2.3

40

Summary:

• Requirements are essentially the same for both Codes.• Minimum performance of water heating equipment is the same for most

categories in both Codes.

C404Service Water Heating

41


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)










C401.2.3

42

Current vs. Proposed:

• Lighting watts per square foot allowances are largely the same as currentcode for many spaces. However:• Office spaces are reduced from 1.0 w/s.f. to 0.9 w/s.f.• Retail spaces are reduced from 1.5 w/s.f. to 1.4 w/s.f.• Warehouse spaces are reduced from 0.8 w/s.f. to 0.6 w/s.f.

• There are more requirements for lighting controls.

C405 Electrical Power and Lighting Systems

43


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)


401.3 (Commercial Parking

Garages)



Systems)




406.2 (HVAC Performance) (1-2 point higher SEER rating on

equipment)

406.3 (Lighting System) (9 – 30% decreases in consumption)

406.4 (Supply of Renewable Energy) -.5 w/ft2 of conditioned space

-3% of the energy used in the building

C401.2.3

44

C406.2 Efficient HVAC performance. Equipment shall meet the minimum efficiencyrequirements of Tables C406.2(1) through C406.2(7) in addition to the requirementsin Section C403.This section shall only be used where the equipment efficiencies in Tables C406.2(1)through C406.2(7) are greater than the equipment efficiencies listed in TableC403.2.3(1) through 403.2.3(7) for the equipment type.

C406 Additional Efficiency Package Options

45


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)



Garages)



Systems)





equipment)

406.3 (Lighting System) (9 – 30% decreases in

consumption)



C401.2.3

46

C406.3 Efficient lighting system. Whole building lighting power density (Watts/sf)shall comply with the requirements of Section C406.3.1

C406.3.1 Reduced lighting power density. The total interior lighting power(watts) of the building shall be determined by using the reduced wholebuilding interior lighting power in Table C406.3 times the floor area for thebuilding types.


47

48


C401

.2 (re

quire

s fol

lowi

ng o

ne o

f thr

ee)

ASHRAE 90.1 (2010)

C401.2.2 (which

requires)


Garages)402

(Building Envelopes)403

(Building Mechanical Systems)



406 (One subsection

from)

406.2 (HVAC Performance) (1-2 point higher SEER rating

on equipment)

406.3 (Lighting System) (9 – 30% decreases in

consumption)

406.4 (Supply of Renewable Energy) -.5

w/ft2 of conditioned space -3% of the energy used in

the building

C401.2.3

49

C406.4 On-site renewable energy. Total minimum ratings of on-site renewableenergy systems shall comply with one of the following:

1. Provide not less than 1.75 Btu (1850 W), or not less than 0.50 watts persquare foot of conditioned floor area.2. Provide not less than 3 percent of the energy used within the building forbuilding mechanical and service water heating equipment and lightingregulated in this chapter.


50

Three Proposed Compliance PathsC4

01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3

C407 “an annual energy cost that is less than or equal to 85% of the annual energy

cost of the standard reference design.”

C402.4 “Air Leakage”

C403.2 “Provisions applicable to all mechanical systems”

C404 “Service Water Heating”

C405.2 “Lighting Controls”

405.3 “Tandem Wiring”

405.4, “Exit signs”

405.6 “Exterior lighting”

C405.7 “Separate meters in buildings with dwelling units” – mandatory requirement

51


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3

C407 “an annual energy cost that is less than or equal to 85% of the annual energy cost of the standard

reference design.”






405.4, “Exit signs



52


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3











53


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3











54


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3











55


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3











56


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3








405.4, “Exit signs”



57


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3











58


01.2

(requ

ires f

ollo

wing

one

of t

hree

)ASHRAE 90.1 (2010)









equipment)




C401.2.3










C405.7 “Separate meters in buildings with dwelling units” –

mandatory requirement

59

Two Proposed Compliance Paths (Existing Buildings)

C401

.2.3

Appl

icatio

n

ASHRAE 90.1 (2010)

All of the following

Section C402

Section C403

Section C404

Section C405

60


C401

.2.3

Appl

icatio

n (E

xistin

g Bu

ildin

gs)

ASHRAE 90.1 (2010)


Section C402

Section C403

Section C404

Section C405

61


C401

.2.3

Appl

icatio

n (E

xistin

g Bu

ildin

gs)

ASHRAE 90.1 (2010)


Section C402 (Building Envelopes)

Section C403

Section C404

Section C405

62


C401

.2.3

Appl

icatio

n (E

xistin

g Bu

ildin

gs)

ASHRAE 90.1 (2010)



Section C403 (Building Mechanical Systems)

Section C404

Section C405

63


C401

.2.3

Appl

icatio

n (E

xistin

g Bu

ildin

gs)

ASHRAE 90.1 (2010)




Section C404 (Service Water Heating)

Section C405

64


C401

.2.3

Appl

icatio

n (E

xistin

g Bu

ildin

gs)

ASHRAE 90.1 (2010)




Section C404 (Service Water Heating)

Section C405 (Electrical Systems)

65

Current Code: “HVAC System Acceptance Testing”.

• HVAC systems shall be tested and adjusted for function andperformance to ensure that control elements are calibrated, and in properworking condition and that components, equipment, systems, andinterfaces between systems conform to the construction documents.

• Acceptance testing and documentation shall be completed in accordancewith Sections 7.2.9, 7.2.10, 7.2.13, and 7.2.15 of ASHRAE Guideline 0-2005.

• "The Commissioning Process" and the documentation shall be submittedto the building official upon request.

System Commissioning

66

C408.2 Mechanical system commissioning and completion requirements.• Prior to passing the final mechanical inspection, the registered design

professional shall provide evidence of mechanical systems commissioningand completion in accordance with the provisions of this section must beprovided.

• Copies of all documentation shall be given to the owner and madeavailable to the code official upon request in accordance with SectionsC408.2.4 and C408.2.5.

Proposed System Commissioning

67


(C408.2 continued)Exception: The following systems are exempt from the commissioningrequirements:

1. Mechanical systems in buildings where the total mechanicalequipment capacity is less than 480,000 Btu/h cooling capacityand 600,000 Btu/h heating capacity.

2. Systems included in Section C403.3 that serve dwelling units andsleeping units in hotels, motels, boarding houses or similar units.(reminder of section unchanged).

68

C408.2.1 Commissioning plan. A commissioning plan shall be provided and shallinclude the following items:

1. A narrative description of the activities that will be accomplished during eachphase of commissioning, including the personnel intended to accomplish eachof the activities.

2. A listing of the specific equipment, appliances or systems to be tested and adescription of the tests to be performed.

3. Functions to be tested, including, but not limited to calibrations andeconomizer controls.

4. Conditions under which the test will be performed. At a minimum, testing shallaffirm winter and summer design conditions and full outside air conditions.

5. Measurable criteria for performance.


69

C408.2.4 Preliminary commissioning report. A preliminary report ofcommissioning test procedures and results shall be completed and certified by aqualified registered professional and provided to the building owner. The report shallbe identified as "Preliminary Commissioning Report" and shall identify:

1. Itemization of deficiencies found during testing required by this section thathave not been corrected at the time of report preparation.

2. Deferred tests that cannot be performed at the time of report preparationbecause of climatic conditions.

3. Climatic conditions required for performance of the deferred tests.


70

C408.2.4.1 Acceptance of report. Buildings, or portions thereof, shall not pass thefinal mechanical inspection until such time as the code official has received a letter oftransmittal from the building owner acknowledging that the building owner hasreceived the Preliminary Commissioning Report.

C408.2.4.2 Copy of report. The code official shall be permitted to require that acopy of the Preliminary Commissioning Report be made available for review by thecode official.


71

C408.2.5.4 Final commissioning report. A report of test procedures and resultsidentified as "Final Commissioning Report" shall be delivered to the building ownerand shall include:

1. Results of functional performance tests.2. Disposition of deficiencies found during testing, including details of corrective

measures used or proposed.3. Functional performance test procedures used during the commissioning

process including measurable criteria for test acceptance, provided hereinfor repeatability.

Exception: Deferred tests which cannot be performed at the time ofreport preparation due to climatic conditions.


72

C408.3 Lighting system functional testing. Controls for automatic lighting systemsshall comply with Section C408.3.

C408.3.1 Functional testing. Testing shall ensure that control hardware andsoftware are calibrated, adjusted, programmed and in proper working condition inaccordance with the construction documents and manufacturer's installationinstructions. The construction documents shall state the party who will conduct therequired functional testing.


73


Where required by the code official, an approved party independent from the design orconstruction of the project shall be responsible for the functional testing and shall providedocumentation to the code official certifying that the installed lighting controls meet theprovisions of Section C405. Where occupant sensors, time switches, programmableschedule controls, photosensors or daylighting controls are installed, the followingprocedures shall be performed:

1. Confirm that the placement, sensitivity and time-out adjustments for occupantsensors yield acceptable performance.

2. Confirm that the time switches and programmable schedule controls areprogrammed to turn the lights off.

3. Confirm that the placement and sensitivity adjustments for photosensor controlsreduce electric light based on the amount of usable daylight in the space asspecified.

74

Essentially the same for both codes.

C408.2.5.1 Drawings. Construction documents shall include the location andperformance data on each piece of equipment.

System CommissioningDocumentation Requirements

75

C408.2.5.2 Manuals. An operating and maintenance manual shall be provided and include all ofthe following:

1. Submittal data stating equipment size and selected options for each piece of equipmentrequiring maintenance.

2. Manufacturer's operation manuals and maintenance manuals for each piece of equipmentrequiring maintenance, except equipment not furnished as part of the project. Requiredroutine maintenance actions shall be clearly identified.

3. Name and address of at least one service agency.4. HVAC controls system maintenance and calibration information, including wiring diagrams,

schematics, and control sequence descriptions. Desired or field-determined setpoints shallbe permanently recorded on control drawings at control devices or, for digital controlsystems, in system programming instructions.

5. A narrative of how each system is intended to operate, including recommended setpoints.

System CommissioningDocumentation requirements

76

C408.2.5.3 System balancing report. A written report describing the activities andmeasurements completed in accordance with Section C408.2.2.

C408.2.5.4 Final commissioning report. A report of test procedures and resultsidentified as "Final Commissioning Report“.


77

C408.3 Lighting system functional testing. Controls for automatic lighting systems shall complywith Section C408.3.

• Functional testing. …Where required by the code official, an approved partyindependent from the design or construction of the project shall be responsible for thefunctional testing and shall provide documentation to the code official…

• Where occupant sensors, time switches, programmable schedule controls,photosensors or daylighting controls are installed

• Confirm that the placement, sensitivity and time-out adjustments foroccupant sensors yield acceptable performance.

• Confirm that the time switches and programmable schedule controls areprogrammed to turn the lights off.

• Confirm that the placement and sensitivity adjustments for photosensorcontrols reduce electric light based on the amount of usable daylight in thespace as specified.


78

Summary

• Although the updated Code has a different publisher, the Codes say nearlythe same thing.

• Updated Code has more stringent building envelope requirements.

• How does the updated Code effect utility rebates?• How does the updated Code effect existing buildings?

79

Presented by: Andy Thielen, PE

Changes to the Minnesota Commercial Energy Code

Documents

Changes to the Minnesota Commercial Energy Code - MN …...efficiency, and as necessary, updated their code to meet or exceed Standard 90.1- 2010.” See 76 Federal Register 202 (October