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Fill should be designed for in-situ or withdrawn cleaning without damage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Fill should be designed for in-situ or withdrawn cleaning without damage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