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Technical Considerations
Chilled Water Installation
general
The University is undecided at this stage which way it will proceed with regards to the provision of air conditioning to future buildings. For buildings constructed after the year 2000, other technologies (eg VRV systems) may be considered. However for the purposes of the master plan exercise, it has been assumed that the University will continue with the use of chilled water to provide air conditioning to the buildings on the Main Precinct site.
The information provided is conceptual only and is provided to assist in the overall site master planning exercise. The concepts proposed do not constitute a detailed ‘Chilled Water Master Plan’. No detailed calculations have been performed in providing the concepts. We recommend that a detailed Chilled Water Master Plan is developed which would investigate possible alternative air conditioning systems, make recommendations and include detailed calculations to confirm spatial requirements.
Existing Chilled Water Installation Detailed updated plans (Authorisation required from Architects Office for access)
The existing chilled water installation consists of chilled water plant located in three locations:
- Plantroom 1 provides chilled water to buildings 2, 4, 5 and 6 via a below ground pipework reticulation system.
- Plantroom 2 provides chilled water to buildings 7, 8, 17 and 18 via a separate below ground pipework reticulation system.
- Plantroom 1 and plantroom 2 and their associated pipework systems are not connected.
- The Sports and Recreation building has a dedicated air cooled chiller located remotely from the building. This building operates as an independent commercial entity and as such there are benefits in not having this building connected to the central plant.
The Applied Science Building (Stage 2) is in design stage. This building will be connected to plantroom 2 via the associated pipework system. To provide adequate cooling, a new 1,360 Kw chiller and matching cooling tower will be provided and located in plantroom 2. In addition, a 1.2 ML chilled water storage tank will be provided adjacent plantroom 2. The storage tank will be sized to provide partial chilled water storage. Chilled water will be generated by the chiller plant at night making use of a lower electrical tariff and stored in the tank. The stored chilled water will be pumped around the site via the associated pipework system during the day with additional cooling, as required, provided by the chillers.
Chilled Water Installation (up to 2022)
Main Precinct:
For the purposes of the master plan exercise, we have assumed that the University will continue with the use of chilled water for the Main Precinct and in particular the present philosophy of partial chilled water storage in conjunction with chillers.
- The chilled water reticulation system emanating from plantroom 2 shall be extended to serve the new buildings.
- Preliminary calculations indicate that additional plantroom space (of equivalent area to the existing plantroom 2) will be required. It is proposed that the chilled water generating plant is centralised around the existing plantroom 2. The additional plantroom space has been provisionally located adjacent the new 1.2Ml storage tank.
- Extending the partial chilled water storage concept, it is envisaged that an additional 2.4 Ml of chilled water storage will be required. Due to the spatial limitations of the site it is proposed that the additional storage space is located below the new plantroom.
- The existing air cooled chiller serving the Sports and Recreation Building will be relocated and coupled to a new air cooled chiller. The combined chiller installation will provide chilled water to the original and extended building.
City Precinct:
It is assumed that the commercial buildings and the hotel on the City Precinct site will operate as separate commercial entities and as such will be air conditioned via dedicated chillers (or other forms of air conditioning) located wihin the buildings themselves.
Chilled Water Installation After 2022 (future)
Main Precinct:
- The chilled water reticulation pipework serving the main campus will be joined to form a ring main.
- Additional plantroom space (equivalent in size to existing plantroom 2) will be provided.
- An additional 4.8 Ml of chilled water storage will be required. Due to the spatial limitations of the site it is proposed that this is provided below ground storage.
City Precinct:
- The Faculty Area will be provided with dedicated chillers (or other forms of air conditioning) within each building. This arrangement will provide flexibility of use if it was decided to convert faculty space to commercial space at a latter stage. As such it is preferred to the option of providing a reticulated chilled water system with central plant.
- The additional commercial area shall be air conditioned via dedicated plant in each building.
Service Strategy
When considering a services strategy for a development of this intensity, a key impact is access for maintenance and accurate recording of existing service locations in times of emergency.
It is for these two reasons, that proposed corridors be identified early in the Masterplanning stage for the provision of service mains. In this particular situation, the corridors will provide dual access paths between buildings and University operations.
The location of corridors in the relatively clear area required for pathways, will allow easy and quick access to all services when needed with minimal investigation of actual position and are generally sufficiently wide for service locations. Corridors will also provide an opportunity to allow sharing of trenches for service conduits to be installed. This is of particular assistance when corridors are narrow and trench widths are constrained. Although, not preferred, it is possible to locate all services in one single wide trench. Of course, if it is necessary to access only one service in the trench, all services will be exposed and possibly temporarily disconnected while works are undertaken.
The strategy of locating services in corridors is also an extension of the current established service corridor strategy for existing buildings.
Sewer Reticulation
An existing 100mm dia gravity sewer currently services University buildings including a small pump station discharging waste from Edith Cowan House.
An existing 225mm gravity connection is available at Lakeside Drive.
It is proposed that for future development the existing pump station may become obselete and the whole site could be serviced by a 150mm dia gravity main installed in the service corridor. Property connections from buildings can then be installed to individual buildings. However, confirmation of the requirement for the existing pump station must be investigated further when more detailed information or future planning is available.
Development to the West of Grand Boulevard can be serviced by a gravity sewer connection located near the Collier Place intersection.
Water Reticulation
The existing buildings are currently serviced by a ring main connected from Grand Boulevard.
Ultimately, a 150mm dia Water Ring Main extension will be required and located in the services corridor indicated. This service will provide sufficient supply for individual building connections to be made to the reticulation main and provide fire protection by strategically positioned fire hydrants. The necessity for a separate dedicated fire main should be investigated at the detail design stage and requirements confirmed with the authorities.
West of Grand Boulevard can be serviced by water main supply available in Grand Boulevard.
Gas Supply
Two existing gas connections are available, one connection from Grand Boulevard is currently used and services existing buildings. A second connection point from Joondalup Drive will be used for future development and will eventually connect to the existing gas main to complete a looped main. The proposed gas main will be located below ground in the service corridor indicated. Gas Supply exists in Grand Boulevard to service development to the West and will be located in a road corridor.
Power Supply
Power supply to existing buildings is provided by overhead connection from Joondalup Drive. Underground power reticulation then services the existing buildings including five electrical substations of various sizes. Future buildings will be serviced by underground reticulation located in the proposed services corridor. It is proposed that all future substations will be located within new buildings.
Communication
Telstra currently provide user connections to all existing buildings form Grand Boulevard. Additional capacity, if required, for future development is available for Joondalup Drive. Communication mains will be located at the service corridor which will distribute services to individual buildings.
Fibre Optics
Provision for the installation of Fibre Optic cables can be provided in the services corridor and will generally be laid in a shared trench with Telstra cabling.
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