Design and Application

for Hygienic Outcomes

AS/NZS 3666.1

Reflection

Craig JohnsonBusiness Development Manager

Baltimore Aircoil Australia Pty Ltd

Baltimore Aircoil support and promote the

responsible, effective use of evaporative

cooling equipment . . .

Evaporative cooling is the most economical,

environmentally sustainable, scalable and

flexible cooling method available . . .

Legionella Primary &

Point Sources

Potable WaterPrimary Source

Aerosol Point Sources

Aspirated Point Sources

Spa Baths

Fountains

Supermarket Misters

Towers

Hybrid Mists

Warm WaterServices

Water Supply

Un-HygienicLow Flow Pipes

Showers

Dentist Drill

Equipment shall be constructed from non corrosive materials

Pultruded Composite Components provide up to 5 times the glass (strength) of conventional hand laid LRTM G235

GalvanisedSteel

304/316StainlessSteel

AS/NZS 3666.1 DESIGN REQUIREMENT

All internal corners and edges to facilitate cleaning and shall be smooth faced

AS/NZS 3666.1 DESIGN REQUIREMENT

Provision for quick draining and refilling

AS/NZS 3666.1 DESIGN REQUIREMENT

Basins and sumps should be water tight and graded to a (min 50mm dia) drain outlet

AS/NZS 3666.1 DESIGN REQUIREMENT

BEST PRACTICE

Stainless steelfully welded, coldwater basin option

Corrosion resistant Louvres included to prevent debrisand splash out, and exclude direct sunlight

AS/NZS 3666.1 DESIGN REQUIREMENT

Combined Inlet Shields (CIS) / louvresare fitted to all BAC evaporative units

Hot water box covers for cross-flow configurations

AS/NZS 3666.1 DESIGN REQUIREMENT

Maximum drift loss shall not exceed 0.002% max design circulation (AS/NZS 4180)

AS/NZS 3666.1 DESIGN REQUIREMENT

Maximum drift loss shall not exceed 0.002% max design circulation (AS/NZS 4180)

AS/NZS 3666.1 DESIGN REQUIREMENT

Ease of maintenance access

AS/NZS 3666.1 DESIGN REQUIREMENT

Counter-flow Configurations

Ease of maintenance access

AS/NZS 3666.1 DESIGN REQUIREMENT

Counter-flow Configuration's

Ease of maintenance, particularly for . . . water distribution system

AS/NZS 3666.1 DESIGN REQUIREMENT

Ease of maintenance, particularly for . . . cleaning eliminators

AS/NZS 3666.1 DESIGN REQUIREMENT

Fill should be designed for in-situ or withdrawn cleaning without damage

AS/NZS 3666.1 DESIGN REQUIREMENT

Fill should be designed for in-situ or withdrawn cleaning without damage

AS/NZS 3666.1 DESIGN REQUIREMENT

Ease of maintenance, particularly for . . . cleaning basin and sumps

AS/NZS 3666.1 DESIGN REQUIREMENT

AS/NZS 3666.1 DESIGN REQUIREMENT

BEST PRACTICE

Ease of maintenance, particularly for . . . cleaning basin and sumps

Observation of towers with small cold water basinsSmall water retention volumes = harder to manage water chemistry

= risk

Evaporation, bleed, drift, leakage, overflow

Make up WaterWater treatment

Potential for remote sumps to avoid dry running of pump at start up and water + chemical overflow at shut down

BEST PRACTICE

Access to equipment for maintenance and cleaningNon-Corrosive Pultruded Materials

“Easy and safe access for cleaning, inspection and maintenance shall be to and about all plant, equipment and components covered in this (standard).”

BEST PRACTICE

Access to equipment for maintenance and cleaningNon-Corrosive Pultruded Materials

BEST PRACTICEAccess to equipment for maintenance and cleaning

BEST PRACTICE

Access to equipment for maintenance and cleaning

Automatic bleed off to limit the build-up of dissolved and undissolved

solids, minimize scale, corrosion and fouling

AS/NZS 3666.1 DESIGN REQUIREMENT

“Cooling water systems shall be provided with suitable, automatically controlled water treatment systems for effective management of corrosion, scaling, fouling and micro-biological growth including water treatment when the water is first introduced into the system during the construction phase.”

BEST PRACTICE

Basin design should compliment use of sump sweeper piping and nozzles

Sump sweeper piping / nozzles and side stream filtration enhance system hygiene.

Orientation – avoid contamination from exhaust discharges of kitchens and other towers (8m)

AS/NZS 3666.1 DESIGN REQUIREMENT

Refer to AS/NZS1668.2 Mechanical Ventilation specifically

Orientation/Placement – direct sunlight is minimized from wetted areas

AS/NZS 3666.1 DESIGN REQUIREMENT

Discharge away from occupied areas pedestrians and thoroughfares air intakes, building openings, traffic areas

AS/NZS 3666.1 DESIGN REQUIREMENT

Enclosures not to interfere with tower airflow

AS/NZS 3666.1 DESIGN REQUIREMENT

Unit Configurations Adjacent to a Solid Wall or Building

Maximum acceptable envelope air velocity ≤ 1.5 m/sec *

Where Envelope Velocity (m/sec) = Unit Airflow (m3/sec) Envelope area (m2)

Single Side EntryFour Side Entry

Double Side Entry

and ① = Unit Inlet

Enclosures not to interfere with tower airflow

AS/NZS 3666.1 DESIGN REQUIREMENT

Unit Configurations in a Well Installation

Maximum acceptable envelope air velocity ≤ 2.0 m/sec *

Where Envelope Velocity (m/sec) = Unit Airflow (m3/sec) Envelope area (m2)

Single Side EntryFour Side EntryDouble Side Entry

and ① = Useable Louvre

Enclosures not to interfere with tower airflow

AS/NZS 3666.1 DESIGN REQUIREMENT

Unit Configurations in a Louvered Well Installation

Maximum acceptable envelope air velocity ≤ 2.5 m/sec *

Where Envelope Velocity (m/sec) = Unit Airflow (m3/sec) Envelope area (m2)

Single Side EntryFour Side Entry

Double Side Entry

and ① = Unit Inlet

Enclosures not to interfere with tower airflow

AS/NZS 3666.1 DESIGN REQUIREMENT

BEST PRACTICEDesign Exceptions to the Rule – Raised Louvres

Not to recirculate discharge air

AS/NZS 3666.1 DESIGN REQUIREMENT

AS/NZS 3666.1 DESIGN REQUIREMENTPlease note :

AS/NZS 3666.1: Clause 4.1.5

“Cooling towers that undergo retrofit of components such as fill, basins or eliminators or any upgrade for performance shall be required to meet all requirements associated with cooling towers, of this standard”

THANK YOU