Base building air conditioning consists of floor-by-floor air handling system to provide conditioned outside air, and centralised hydronic system serving active chilled beams. On floor plant rooms are located at the north-west and south-west cores adjacent to the bathrooms
Cooling Plant
The condenser water system comprises three cooling towers located on Level 29, above the Level 28 plant room.
Four chillers in total located on Level 28 are served by the cooling towers, consisting of one absorption chiller, two centrifugal chillers, and one screw chiller.
The chillers operate in parallel and together serve all AHUs within the building. Chilled beams are served via a pair of plate heat exchangers in a duty/standby arrangement.
A pair of plate heat exchangers in a duty/standby configuration is served by the cooling towers, and supplies condenser water to for supplementary tenant connections
Heating Plant
Two boiler units are in the Level 28 plantroom.
All AHUs within the building are supplied with hot water from the boilers
Ventilation
Supply air is distributed throughout the building via 8 ducts from the six units on each of the Level 28 plantroom and the Level 3 plantroom, within 5 risers. Supply air is distributed throughout the floor via rigid ductwork and swirl diffusers.
Return air is achieved via the ceiling plenum into a single return air/smoke exhaust riser shaft. Additional ventilation is provided to the amenities spaces via dedicated exhaust systems.
Outside Air
Outside air is supplied to each AHU within both the Level 3 and Level 28 plantrooms. These units are controlled by the BMS to ensure that the supply air maintains conditions above the dew point of the chilled beams within the served zones.
Tenant Condenser Water System\A tenant condenser water system is available with 100% stand-by power generation. The tenant condenser water system consists of a pair of primary pumps, supplying a pair of plate type heat exchangers. A pair of secondary pumps supplies the tenant condenser water loop.
All pumps are installed with VSDs and operate in a duty/load configuration. The heat exchangers operate in a duty/load configuration via motorised isolation valves.
The condenser water system is designed to the following conditions:
- 30.5°C entering temperature, 36°C leaving temperature
- 200kPa static pressure allowance at take-offs
- 33W/m² cooling
- Floor connection valve sized to 84W/m²
- Podium 1 and Podium 3: 285l/s per floor
- L4 – L11: 460l/s per floor
- L12 – L15, L17: 495l/s per floor
- L16: 390l/s
- L18: 480l/s
- L19 – L27: 530l/s per floor
- Outside air is tempered to levels 4-27
- L4 – L15, L17: 300l/s per floor
- L16: 235 l/s
- L18: 295 l/s
- L19 – L27: 32l/s per floor
- Podium 1 and Podium 3: 300l/s per floor
- The systems are fitted with a VSD to converse energy when the maximum air quality is not required
- L4 – L27: 300l/s per floor
- Podium 1 and Podium 3: 380l/s per floor
- L16 – L27: 2600l/s total
- L4 – L15: 2600l/s total
- Ground Floor Restaurant Tenancy: 3000l/s
- Podium 1 and Podium 3 Tenancy: 4000l/s total
- Supplementary air conditioning unit control must be able to supplement the control of space conditions maintained by the Building Management and Control System (BMCS).At no time will the supplementary unit operate in opposition to the base building system, and as such no Tenant supplementary units will be permitted in open office areas without prior approval from Building Management.
- Relocation of base building thermostats are to be clearly documented and submitted for approval. In the event of the supplementary system and base building serving the same area, base building thermostats must be excluded from set point calculations. Works should ensure that there is no impact on the base building operations.
- The base building temperature sensors/controller signals in areas served by the Tenant’s packaged a/c units should be deselected from the overall base building supply air temperature control. The areas will operate under local control of the terminal unit controller but will not have the capability to override the central plant operation.
- Air Conditioning System
- Chilled water system
- Ventilation and exhaust systems
- Miscellaneous air conditioning units
- Tenant condenser water system
- Car park ventilation system
- Electrical services – selected control and monitoring
- Fire services – monitoring alarms
- Lift services – lift motor room monitoring (note temper
- Hydraulic services – selected control and monitoring
- the provision of details of the proposed installation for review and approval
- the provision of details of the equipment including the model and manufacturer, the output in kilowatts and the water flow requirements, and
- confirmation that units will be set-up to run to suit tenant needs for only if is necessary.
- isolating valves on the flow and return pipelines
- Head pressure modulating control valve
- an electrically operated solenoid or motorised valve in the flow to the unit activated only when the compressor starts
- a fine mesh strainer in the flow pipeline to the unit
- a "STAD" water balancing valve in the flow to each unit
- a “STAD” water balancing valve at the take-offs on each rise to allow flow checks to be carried out
- a mechanical interlock, which disables the refrigeration component on loss of condenser water flow and resets automatically on return of flow
- where the Tenant is not a whole floor tenant there must be a set of capped off isolation valves left for future connection by other suite tenants, and
- straight pipe runs that minimise system pressure losses.
- all valving as noted above in the approximate area of it intended or actual location, and
- all pipe work shown in its intended or actual location and dimensions.
- investigation and recording of existing air and water quantities
- system pressures and fan operating currents and pressures, and
- smoke control and stair pressurisation systems.
- The Tenant is responsible for ensuring that the air distribution is suitable for Premises loads.
- testing and commissioning of all modified mechanical systems as well as smoke control and stair pressurisation systems, and
- Re-commissioning and re instatement of all existing systems must be undertaken to ensure that the balance and performance of base building systems is not detrimentally affected.
- re-testing of stairwell pressurisation systems to ensure compliance and provision of certification of the systems performance equivalent to the annual Fire Certification for the floors affected
- re-testing of all fire mode operation of central plant including dampers in fire affected and non-fire affected modes and provision of certification of the systems performance equivalent to the annual Fire Certification for the floors affected
- re-establishing of the floor supply air static pressure and air quality for each zone at full cooling
- Recommissioning of all VAV and mixing box terminals including maximum and minimum air quantities and rebalance of heating water flows. Note this includes updating the BMCS parameters within the controllers
- balancing supplementary condenser water system where supplementary air-conditioning systems are installed
- demonstration that air flows, water flows and system operation to the satisfaction of Building Management
- provision of technical data for all supplementary systems, testing and commissioning data and as installed drawings in hard copy and AutoCAD 2000 format for inclusion in the buildings Operating & Maintenance Manuals, and
- testing of base building systems and other tenanted areas is to be undertaken outside of Building Service Hours or at times agreed with Building Management to cause minimum disruption to other tenants.
- Air balancing and system testing must be undertaken by a qualified contractor.
Tenants must provide all details regarding the condenser water usage rates for each package unit to Building Management before works commence.
All water supply pipework must reticulate within the Premises. Tenant condenser water flow and return lines to the riser must be suspended independent of all other services and be run so that they do not prevent the removal of ceiling tiles, light fittings, smoke detectors, or any other services.
Flexible hoses for final connections to Tenant’s supplementary air conditioning units are not permitted. As such units can only be suspended from acoustically insulated brackets fixed to the side of beams.
The condenser water pipework, supplementary units and associated equipment are to be designed such that they do not create index runs in any location and do not increase the pressure drop above the design intent of the condenser water system.
Connection to the Tenant Condenser Water System is subject to agreement by Building Management. The Tenant is responsible for all works, cleaning and maintenance beyond the floor valve connection take off point.
Supplementary Outside Air System
A supplementary outside air riser for additional tenant outside air requirements is provided. The supplementary outside air system consists of an outside air fan in the Level 3 plant room serving Podium 1 and 3 levels, a dedicated AHU in the Level 3 plant room serving levels 4-15, and a dedicated AHU in the Level 28 plant room serving levels 16-27. The system design is as follows:
Connection to the system is subject to agreement by the landlord and the tenant shall be responsible for all works, cleaning and maintenance beyond the floor outside air take off branch.
Supplementary General Exhaust System
A supplementary general exhaust system is provided for additional tenancy requirements. The supplementary general exhaust system consists of a general exhaust fan on Level 29 plant room serving levels 4-27, and a general exhaust fan in the Level 3 plant room serving Podium 1 and Podium 3 tenant spaces. The system design is as follows:
Connection to the system is subject to agreement by the Building Management. The Tenant is responsible for all works, cleaning and maintenance beyond the floor exhaust take off point.
Supplementary Toilet Exhaust System
A supplementary toilet exhaust system is provided for additional tenancy requirements. The supplementary toilet exhaust consists of a blanked off branch from the base build toilet exhaust system on each tenanted floor. The system design is as follows:
Connection to the system is subject to agreement by the Building Management. The Tenant is responsible for all works, cleaning and maintenance beyond the floor exhaust take off point.
Supplementary Kitchen Exhaust System
A supplementary kitchen exhaust system is provided for additional tenancy requirements. The supplementary kitchen exhaust system consists of a dedicated kitchen exhaust fan on Level 29 serving levels 16-27, a kitchen exhaust fan on Level 29 serving levels 4-15, a kitchen exhaust fan serving Podium 1 and 3 levels, and a dedicated kitchen exhaust fan serving the Ground Floor restaurant tenancy.
The system design is as follows:
Connection to either system is subject to agreement by the Landlord and the tenant shall be responsible for all works, cleaning and maintenance beyond the floor exhaust take off point, including extraction hoods and make-up air systems, which are to be provided by the tenant.
Premises Controls System and Logic
The Premises controls system must have no impact on the base building operations and must meet the following minimum criteria:
All equipment and software must be capable of handling and interpreting time, day and year dates (including leap years) indefinitely from the present date without error.
All equipment and components including software, firmware and controls must conform to the requirements of Australian Standard HB104 or British Standard PD2000.
Building Monitoring and Control System (BMCS)
The BMCS system is a Delta Controls ORCA system. The system consists of system managers, application controllers, and field modules, with all hardware being native BACnet.
The BMCS controls generally and/or monitors all the services within the Building, such as:
Operator Workstation
An operator workstation complete with high-resolution monitor, keyboard, alarm and logging printers is in the Building Manager’s office on the Mezzanine Level. A server is in the Level 3
plant room, running the ORCA web server. The ORCA web front-end is designed for use by both facility staff and tenants, with no limit on the number of simultaneous users
After-Hours Air-Conditioning Interface
After hours air conditioning is available on selected floors via existing control panels. Access is also available via web based portal. Consult building management where required.
The details and costs of this system are available from Building Management.
Premises Considerations
Tenants adding components must ensure the BMCS system is fully updated to reflect additional devices. All Premises changes and variations to the BMCS, both hardware and software, in its entirety, must be performed by an Approved Contractor. All BMCS information must be forwarded to the BMCS Controller for inclusion in the BMCS Site Quality Manual.
Interlocks must be provided to prevent base building air conditioning control conflicting with premises PAC controls.
General Works Conditions – Mechanical
Thermostats are to be in the areas they serve.
Where it is determined that the Tenant will have an increased need for air conditioning outside of the Building Service Hours (for example, for call centres and operations centres) the Tenant must install Tenant supplementary units to minimise energy use of the base building plant and reduce costs to the Tenant.
All supplementary air conditioning units serving areas other than computer rooms must have timer switches to allow the unit to run for a maximum time of 1 hour maximum before turning off. The controls should be manual on and automatic switch off based on a timer.
All supplementary units are to be connected to the BMCS.
Where it is necessary to remove or relocate any existing mechanical infrastructure, including mixing boxes, thermostats and/or controls the Tenant will require approval from the Approved Consultant for Mechanical Services so that the performance of the existing design is not affected.
Where it is necessary to remove or relocate any existing mechanical infrastructure, including mixing boxes, thermostats and/or controls the Tenant must engage the relevant Approved Contractors to complete the works.
Any amendments must be pre-approved by Building Management and must be properly installed or removed and connected or disconnected from the BMCS system by the Approved Contractor for Mechanical Services.
All ductwork, rigid and flexible must be supported from the under-side of slab. No ductwork must be supported on the ceiling grid. Similarly, no ceiling grid or other service is to be supported from the ductwork or pipework.
All occupied areas/rooms meeting rooms and function rooms must be provided with minimum outdoor air rates in compliance with AS 1668.2 - 2012. All calculations and documentation must be presented to Building Management to demonstrate compliance with minimum outside air rates.
Appropriate sizes, numbers and locations of access panels must be provided for the maintenance services of all mechanical plant, dampers, VAV boxes and duct heaters etc. Access panels must be sized to allow safe access to all equipment and be of a standard like that throughout the Building.
All condensate from the additional package unit(s) is drained to tundishes/floor wastes via condensate drainage pipes. Where falls are inadequate to facilitate effective drainage a suitable pump out system must be installed.
Where condensate pumps are utilised, these are to be interlocked with the operation of the associated air conditioner to prevent flooding on failure and fitted with an alarm. Condensate pump are to include drip trays and water leak detection in line with supplementary units.
Where computer room type units are used the condensate / humidifier waste must drain to a cooling tank prior to being pumped. The supply air outlets (and/or return air inlets) that are being relocated must be rebalanced. The Tenant must present the new commissioning figures of the whole Premises to Building Management on the completion of the works.
A solenoid valve is to be provided to each of the condenser water flow lines to the package air conditioning units to avoid circulation of condenser water through these units when they are not operating.
Where supplementary systems are supplied with outside air from the Tenant’s supplementary outside air system, motorised dampers are required to shut off the supplementary air supply when the associated unit is not running.
Each supplementary air conditioning unit must be electrically connected to the Tenant’s non- essential distribution board. Each unit must be clearly numbered on the outside of the unit
and identified on the distribution board. All controls associated with package units must be electric/electronic type.
No modifications to chilled, heating or condenser water loops are permitted without the approval of the Approved Consultant for Mechanical Services.
During works all return air riser take-offs and chilled beams on floors affected by the works must be covered with an appropriate filter media to minimise dust in the return air plenum and ductwork.
Tenancies on multi-tenanted floors may require either acoustic security transfer ducts across the Premises dividing partition or return air grilles in the Premises wall to the core corridor and corridor ceiling grilles, to allow the return air from the Premises to leave the Premises and return to the false ceiling level to the return air duct.
Areas which are highly partitioned or have floor to slab partitioning must have sufficient return air grilles to allow return air to traverse the above ceiling space when partitioned doors are shut.
The VAV boxes and air diffusion equipment layout must be designed and installed to allow correct VAV modulation and thus avoid hot spots, under-sized zones, poor temperature sensing and the like. Ductwork modifications will be minimised to maintain straight duct runs and resultant pressure loss through system. Use of flexible duct must be kept to a minimum with bends kept gentle (bend radius >1.5 diameters).
Prior to commencing works, the Tenant must provide a detailed plan showing the location of all staff, equipment and lighting to determine the heat load and the usage of all areas. These plans must be provided to the Approved Consultant for Mechanical Services for approval.
Connection to the dedicated condenser water system for package units is generally available subject to the following:
The pipe work to the unit must include the following:
All drawings submitted must include the following:
Building Management may carry out spot checks on Premises condenser water flow rates at any time. Should the checks show that the flow rate exceeds that agreed between the Tenant and the Building Management Building Management will require the Tenant to return the flow to the agreed level or alternatively pay for the excessive use at agreed rates.
Where existing air and water systems are to be modified as part of the works the following must be undertaken prior to commencement of the work and submitted to the Building Management for review:
Premises Commissioning
Following the completion of the Premises ductwork changes, the following commissioning procedures associated with the base building systems, must be completed by the Tenant:
Following the completion of works, the following commissioning, testing and proving procedures associated with the base building systems must be undertaken by the Tenant:
All commissioning to be undertaken in accordance with ASHRAE Guideline 1 and CIBSE Commissioning Code A, B, C, M, R and W.