Welcome to the AIRAH Vic Divisional Seminar...2019/05/08 · Civic Centre, NSW Shellharbour Civic Centre Façade of the library, museum and auditorium foyer View from the Public Square,

8/05/2019

Welcome to the AIRAH Vic Divisional Seminar

‘NCC2019 Update’

Upcoming events in Victoria

� Melbourne Industry Night – 15th May at Caulfield Racecourse

� Refrigerants Seminar – 5th June

� Trivia Night – 11th July

� Shepparton Industry Night – 4th September

� Vic Golf Day – 22nd November

29 May - Melbourne4 June – Perth5 June – Adelaide11 June – Canberra12 June – Sydney14 June - Brisbane

Members = $170Non-Members = $230

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Tonight’s Speakers:

Brett Fairweather, M.AIRAH - It’s Engineered

Jenny Lewis - WSP

Brett Fairweather, M.AIRAHIt’s Engineered

WHERE DOES THE NCC FIT IN?

� Government Acts & Regulations require NCC/BCA

� BCA permits Deemed-to-Satisfy (DTS) or Performance (Alternative) Solutions

� DTS ventilation requirements are included in F4.5, F4.11, F4.12, E2.2 etc, which refer to Standards

� Numerous Standards. The AS 1668 series lies at the core of mechanical ventilation design and certification

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� Readability improvements

�Application, Limitations, Notes & Explanatory Information are highlighted throughout

� State & Territory Variations highlighted

� Digital compatibility for web content

�The arrangement of some tables has changed

� Definitions for all volumes are combined in SCHEDULE 3

� Referenced documents moved to SCHEDULE 4

NCC2019 GENERAL CHANGES

IMPROVED ACCESS – IT’S ONLINE!ncc.abcb.gov.au

It’s also available in

mobile format!

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BUT DON’T WORRY…PDF & HARD COPIES STILL EXIST

HOW DO WE USE THE NCC?

Each volume of the NCC is divided into two main sections:

1. Administrative requirements contained within the Governing Requirements (SECTION A).

2. Technical requirements contained within the remaining sections of the NCC.

The Governing Requirements tell us the rules and instruct us in how we use and comply with the NCC.

Don’t ignore Section A!

SECTION AGoverning Requirements

Part A1 Interpreting the NCC

Part A2 Compliance with the NCC

Part A3 Application of the NCC in States and Territories

Part A4 NCC referenced documents

Part A5 Documentation of design and construction

Part A6 Building classification

Part A7 United buildings

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� New Verification Methods for parts of:

� Structure (Section B)

� Fire Resistance (Section C)

� Access & Egress (Section D)

� Services and Equipment (Section E)

� Health & Amenity (Section F)

� Ancillary Provisions (Section G)

� Energy Efficiency (Section J)

NCC2019 TECHNICAL CHANGES

� Our colleagues-in-coordination will be dealing with changes to:

� Building Envelope – Fabric, Glazing, etc

� Lighting Energy

� Lift Energy

� Fire Resistance

� Sprinklers

� Access & Egress Improvements

NCC2019 TECHNICAL CHANGES

� Section C – Fire Resistance (options for reporting)

� Section E – Smoke Hazard Management (clarifications)

� Section F – Condensation Management (new)

� Section J – Energy Efficiency (big changes!)

NCC2019 HVAC RELATED CHANGES

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� Amendment to Tested Systems, permitting the use of reports from an Accredited Testing Laboratory to confirm the FRL of systems that vary from a tested prototype.

� Refer to Section 4 of AS 4072.1

Components for the protection of openings in fire-resistant separating elements Service penetrations andcontrol joints

C3.15OPENINGS FOR SERVICE INSTALLATIONS

� The term “zone smoke control” became “zone pressurisation”, aligning with AS 1668.1

� Clarification that zone pressurisation only applies to “vertically separated” fire compartments.

� Wait, what…?

E2.2SMOKE HAZARD MANAGMENT

© Commonwealth of Australia and the States and Territories 2019, published by the Australian Building Codes Board.

extract from NCC2019 Volume 1 Table E2.2a

ZONE PRESSURISATION IN NCC2019

extract from NCC2019 seminar presentation, ABCB 2019

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WHAT DOES AS 1668.1SAY ABOUT THIS?

� AS 1668.1 is “neutral” on WHERE and WHEN Zone Pressurisation is applied.

� Requirements are all relative to fire compartments.

� Relevant compartments determined by the NCC

(ie: “vertically separated”).

� Non-mandatory Appendix A in AS 1668.1 (for Health and Aged Care Buildings) was revised to improve neutrality, but remains “informative” only.

(eg: “which may exceed the requirements of the NCC”)

WHILE WE’RE TALKING ABOUTAS 1668.1…

Amendment 1 to AS 1668.1:2015 was published in December 2018 ( & this is referenced in NCC2019 )

• Redefined minor systems relative to an “air path”

• Shutdown exemption for some dedicated OA in a single enclosure

• Subduct configurations • Kitchen exhaust protection

• 2m duct concessions –breakaway joints

• Shutdown Systems –more alignment with NCC E2.2(b)

• Stair Pressurisation –number of doors in testing • Additional commentary

• Stair pressurisation –equipment protection

• Corrected figures

� Emerging realisation that there are health risks associated with trapped water vapour inside buildings, particularly in colder climates, where ventilation is poorly managed by occupants

� Managing the water vapour may preventing mould growth

� Part F6 may not solve the problem! (this is not “Condensation Control”)

� Designers may exceed these minimum provisions, if additional prevention is required

� Part F6 is an initial step in a staged implementation of condensation management requirements in the NCC

F6CONDENSATION MANAGMENT

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F6CONDENSATION MANAGEMENT

� 3 elements of construction addressed in the new Part F6 (NCC Volume 1):

� Pliable building membrane (sarking, only where this is included)

� Flow rate and discharge of exhaust systems (only where this is included)

� Ventilation of roof spaces (would only apply to voluntary provisions that exceed AS 1668.2)

� Part F6 is limited to Class 2 SOU’s & Class 4 parts

� Part F6 only applies IF these construction elements exist

(none are enforced by Part F6 alone)

F6Condensation Management

� IF a Pliable Building Membrane exists,

� It must comply with AS/NZS 4200 Parts 1 & 2

� Pliable building membranes and underlays (materials & installation)

� Where it’s used in climate zones 6,7 and 8, it must be “vapour permeable”

� not just perforated sarking

� stops water getting in, allows water vapour out

� Must be positioned correctly, relative to the wall construction


� IF an exhaust system exists

� Prescribed minimum exhaust from bathrooms, laundries and kitchens

� Consistent with flow rates in much of AS 1668.2

� Kitchen exhaust MUST be discharged outside

� Recirculating rangehoods will no longer comply!

� Bathroom or laundry exhaust may be discharged

� to outside (consistent with AS 1668.2); or

� to an adequately ventilated roof space (inconsistent with AS 1668.2)

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� IF an exhaust discharges into a roof space

� This will not comply with AS 1668.2, so this is only possible for systems not required by Part F4

� Minimum unobstructed area is prescribed, relative to the roof pitch

� Half the area over 22° pitch

� What is the “unobstructed area”?

� Openings must promote air movement through the roof space:

� 30% of openings not more than 900mm below roof pitch

� Remaining area provided by eave vents


� Part F6 does not

� stop condensation

� make any reference to Part F4 or AS 1668.2

� mention make-up air (consider FP4.3 & FP4.4)

� tell the occupants to open a window

Changes to NCC Section J

2019Jenny Lewis

Associate - Sustainability

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NCC Section J Changes in 2019

� Much more stringent minimum compliance

� Highly unlikely that a fully glazed façade will meet minimum compliance !

Source: Energy Action

Timeline for Implementation

Transition period until May 2020

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Which projects does this impact?

- NatHERS star ratings unchanged

- Maximum heating and cooling loads introduced

- Thermal break requirements apply

ALL CLASS 2-9

CLASS 2 RESIDENTIAL

RETAIL “DISPLAY GLAZING” DEFINITION TIGHTENED

CLASS 3-9 IMPACTED

HOLISTICALLY

Key areas of change

Building Fabric: Walls and Glazing

WWR x SHGC x Shading factor ≤ 0.13 (climate zone 6)

Now assessed holistically

Window-to-Wall ratio has a dramatic impact

on compliance

Fully glazed facades with no shading will require an SHGC of

0.13

Therefore, a reduction in glazing and/or

increased shading will realistically be

required

Class 3, 9C, 9a ward area: Area-weighted

U-value of 1.2 W/m2K required

Other classes: Area-weighted U-value of 2

W/m2K required

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Building Fabric

� Roofs:

� Minimum R-value remains R3.2 for Victoria

� Minimum surface absorptance introduced (≤ 0.45)

� Floors:

� R-value R2.0 with no in-slab heating/cooling

� R3.25 with in-slab heating/cooling, plus slab edge insulation

� Thermal breaks: prescriptive requirements introduced for walls and roofs

Air Conditioning and Ventilation Systems

� Increased requirements for outdoor air heat recovery and CO2 control

� Increased fan system efficiency requirements

� Increased pumping system requirements

� Increased piping insulation requirements

� Maximum pressure drops permitted in airside and waterside systems decreased

Lighting and Power

� Lighting power density allowance (W/m²) is reduced by about half to meet market standard (LED)

� Architectural/feature lighting may be more difficult to comply – e.g. foyer spaces, lobbies, restaurants, hotels

� Increased requirements for automatic controls –sensors, dimming, etc.

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Lifts

� Lighting and ventilation must turn off when the lift is unused for 15min

� Minimum requirements for idle and standby power and energy efficiency class

� Requirement to meet ISO 25745-2

Verification MethodsJV1 – NABERS Energy for Offices

� Class 5 only

� 5.5 Star NABERS Energy Commitment Agreement

� Base building GHG not more than 67% of the 5.5 Star level

� PMV ±1 for 95% of the floor area for 98% of hours

Verification MethodsJV2 – Green Star

� Class 3, 5, 6, 7, 8 or 9

� Complies with the simulation requirements and is registered for a Green Star Design and As Built rating

� Annual GHG emissions of the proposed building are less than 90% of the reference building

� PMV ±1 for 95% of the floor area for 98% of the hours

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Verification MethodsJV3 – Verification using a reference building

� Class 3, 5, 6, 7, 8 or 9

� Annual GHG emissions of the proposed building not more than the GHG emissions from the reference building

� PMV ±1 for 95% of the floor area for 98% of the hours

Collins Arch Development, 447 Collins Street, Melbourne

Building Fabric, Roof Lights and Glazing

Compliance with 2016 is achieved through JV3

assessment

Individual elements did not meet DTS

provisions proposed for 2019

JV3 modelling demonstrates

NO elements would require upgrading to meet

compliance with 2019

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Features which support good performance

� Shading:

• 300mm-500mm on west

• 500mm on north

• Overshadowing

� Glazing:

• SHGC 0.25

• U-value: 2.5 W/m2K

� Extensive optimisation via simulation


� The majority of elements meet the DTS provisions of 2019

� Non-compliances include:

� Heating hot water pipework insulation will need to be increased (R1.5 to R1.7)

Artificial lighting and power

� The majority of spaces meet the DTS provisions of 2019 via LED lighting


� Lighting power density requirements are not met in the hotel lobby, hotel standard room or commercial lobby

� Additional sensors would need to be included in the design to achieve compliance

� Dimming controls would need to be provided

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CASE STUDY: Shellharbour Civic Centre, NSW

Shellharbour Civic Centre

Façade of the library, museum and auditorium foyer View from the Public Square, showing office tower behind


� The building was designed to meet Section J 2016 as well as achieve a 5 Star Green Star and NABERS 5 Star

� JV3 modelling demonstrates the building is deemed compliantwith the 2019 requirements

� PMV ±1 achieved for all zones

Key features which

assisted compliance:

Copious shading on fully glazed

areas

Reduced WWR on exposed facades

Dark glass

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Motorised dampers would be

needed to be added at

every riser take-off at every floor

One new fan selection

was made to check

possible compliance

Attenuators would have to increase in size to reduce

pressure drop

Pipework will need to be upsized to reduce pressure

drops

Refrigerant piping and heating hot

water insulation

will need to be nominally doubled in thickness


� Lighting power density in the proposed design met compliance with Part J6 of the NCC 2019

� Additional motion sensors would need to be included in the car park entry to achieve compliance

Economic Analysis

� No changes were required to building fabric and glazing

� Additional dampers would be required at an estimated cost of $64,000

� Additional motion sensors required in the car park entryway, at a nominal cost.

� Total budget impact of 0.1% of the construction budget

� Does not include any impact on the Green Star strategy for the project

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CASE STUDY: Bupa Stirling, ACT

Bupa Stirling

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� Compliance with 2016 is achieved through JV3 assessment

� Individual elements did not meet DTS provisions proposed for 2019

� JV3 modelling demonstrates the following elements would require upgrading to meet compliance with 2019:

Additional R0.5 of

insulation added to external

walls

Roof insulation

was increased by R1

A tint applied to all

windows to achieve SHGC

0.44 (currently

0.65)

Existing shading

doubled in depth from 300mm to

600mm

Additional shading

added to all windows on north, east and west

which did not have shading

previously




Air-to-air heat exchangers required for all outside fans OR demand controlled ventilation

Fan efficiencies. Alternative fan selection was made to check possible compliance

Some ductwork will have to increase in depth


� Lighting power density requirements are not met in the toilets, the foyer or the office spaces

� Additional sensors would need to be included in the design to achieve compliance

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Complications with meeting compliance

� Increasing the size of services would require coordination with other services and the architect

� The lighting design was found to be compliant with the exception of the lighting power density in the hotel and commercial lobbies and hotel standard rooms

Compliance could be achieved in this instance through reducing the lighting installed and no cost addition would be expected, however the amenity of the spaces may be impacted

Economic Analysis

ITEM INDICATIVE 2019 COST IMPACT

Building Fabric and Glazing – roof and wall

insulation, improved SHGC in glazing, increased

shading

$68,652

HVAC and Ventilation – CO2 sensors, heat

exchangers

$86,400

Lighting and Power – motion detectors, dimming

controls, new switches

$24,800

Lifts $14,475

TOTAL $194,327

Approx 1.5% of the construction

budget

2019 Update

Energy Efficiency Project

The project has a commercial and a residential component, with the commercial building changes targeting the common areas of apartment buildings (Class 2 buildings), Class 3 buildings and Class 5 to 9 buildings.

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NCC 2019 – HVAC Update

The planned changes for commercial buildings include:

– Increasing the stringency to a point where the value of energy saved outweighs the increased cost of construction;

– improving the current reference building Verification Method (JV3);

– formally recognising NABERS Energy and Green Star as Performance Verification Methods;

– simplifying the Deemed-to-Satisfy Provisions; and

– introducing basic comfort levels for building occupants.

These changes will result in more efficient and comfortable buildings, while also simplifying compliance options. The changes will also play an important part in Australia meeting its greenhouse gas reduction and energy productivity targets.

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Performance RequirementsJP1

a) For a building with a conditioned space, achieving an hourly regulated energy consumption, averaged over all hours of operation in a year, of not more than –

i. For a class 2 common area, Class 5, 6, 7b, 8, 9a building, or a Class 9b School, 30kJ/m2.hr; and

ii. For all other building classifications, 8kJ/m2.hr.

Use of a set value energy consumption level to be proved by modelling

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JV3 Verification using a reference

building

The general methodology has not changed for JV3. A reference building is built and then the 2 proposed model comparison is still used.

The overall comparison results are now expressed in Green House gas emissions, not energy consumption.

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Software Validation– ANSI/ASHRAE Standard 140 improves on the BESTEST

methodology as per the peer review of the software test methodologies completed by the U.S. Department of Energy.

– https://www.energy.gov/sites/prod/files/2014/10/f18/emt62_Judkoff_042214.pdf

Infiltration– Leakage rates are based 10m3/hr.m2 at 50Pa. This will require

energy modelling software to have the capability to do mass flow calculations in determining the performance of the façade system.

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Water Heating systems– Accounting for energy use and efficiency impacts due to the water

volume, time of operation, feed water pumps, efficiency of the heating unit based on different input water temperatures, and thermal losses

Ancillary Energy– Co-generation and Tri-generation systems modelling is required to account

for all ancillary energy consumption of these systems.

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J5 Air Conditioning and Ventilation SystemsMajor changes are summarised as:

– increased stringency on control of systems, for both air and water based systems

– Time switching on smaller systems than previously required, now down to 2 kWr and 1 kWheating

– Energy reclaim for mechanical ventilation systems to conditioned spaces

– Demand control ventilation required in accordance with AS1668.2

– A required outdoor air treatment framework based on climate zone and air volumes

– Carpark exhaust systems must have contaminant based control

– Calculated fan minimum performance operating efficiency using a formula

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J5 Air Conditioning and Ventilation Systems

New items within the 2019 code– direct signals from the control components responsible for the delivery

of comfort conditions

– minimum control dead band of 2°C

– balancing dampers and balancing valves that ensure the maximum design air or fluid flow

– independently operating space of over 1000 m2 and every separate floor of the building has provision to terminate airflow independently

– automatic variable temperature operation of heated water and chilled water circuits

– when deactivated, must close any motorised outdoor air and return air damper

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J5.4 Fan systems

• ɳmin = the minimum required fan operating efficiency; and

• P = the motor input power of the fan (kW); and

• N = the minimum performance grade obtained from Table J5.4a; and

• a = regression coefficient a, obtained from Table J5.4b;

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J5.4 Fan systems

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J5.4 Pump systems

(a) General— Pumps and pipework that form part of an air-conditioning system must

either—

(i) separately comply with (b), (c) and (d); or

(ii) achieve a pump motor power per unit of flowrate lower than the pump motor power per unit of flowrate achieved when applying (b), (c) and (d) together.

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J5.7 Pump systems(b) Circulator pumps — A glandless impeller pump, with a rated hydraulic power output of less than 2.5 kW and that is used in closed loop systems must have an energy efficiency index (EEI) not more than 0.27 calculated in accordance with European Union Commission Regulation 622/2012

(c) Other pumps — Pumps that are in accordance with Articles 1 and 2 of European Union Commission Regulation No. 547/2012 must have a minimum efficiency index (MEI) of 0.4 or more when calculated in accordance with European Union Commission Regulation 547/2012

(d) Pipework — Straight segments of pipework along the index run, forming part of an air-conditioning system—

(i) In pipework systems that do not have branches and have the same flow rate throughout the entire pipe network, must achieve an average pressure drop of not more than—

(A) for constant speed systems, the values nominated in Table J5.7a; or

(B) for variable speed systems, the values nominated in Table J5.7b; or

(ii) in any other pipework system, must achieve an average pressure drop of not more than—

(A) for constant speed systems, the values nominated in Table J5.7c; or

(B) for variable speed systems, the values nominated

able J5.7d.

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J5.4 Pump systems

where—

• ɳmin= the minimum required pump efficiency at design duty

• Qduty = the design operating flow of the pump (m3/h); and

• Hduty = the design operating head of the pump (m); and

• a, b, c, d and e = regression coefficients, obtained from Table J5.7a. ;

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Pump Sample CalculationThe details of the pump 39.24 m3/h (10.9 L/s) at 29.56 m of head (290 kPa) with a 2 pole motor. These parameters meet the criteria within J5.7(c)(i), (ii) and (iii). Therefore, the minimum pump efficiency requirements apply.

From the table 5.7a – the coefficients in the formula are:

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Pump Sample Calculation

ɳmin =

(−0.000649×39.24)+0.169×ln(9.24)+(−0.00221×29.56)+(0.00000146×29.562+0.148

= 0.679 (67.9%)Therefore on the pump selection curve at the operating point of the proposed pump must be better than the above efficiency.

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Thank you for your attention

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Documents

Welcome to the AIRAH Vic Divisional Seminar...2019/05/08 · Civic Centre, NSW Shellharbour Civic Centre Façade of the library, museum and auditorium foyer View from the Public Square,