Associations
The CESA AON Business Excellence Awards recognise the contribution that engineering practitioners make in pursuit of excellence in service delivery in various project categories .
Various passive design options were investigated and implemented to ensure that there is no abnormal heat transfer and also to provide a reduction in the heat load required for cooling the data centre space . The HVAC system complied with the following principles : an ASHRAE Class A1 environment for the IT equipment and services
• energy efficiency
• lowest possible capital and operational costs
• reliable and trouble-free installation .
The units selected for this project are all air- cooled units and not dependent on a water supply . Additionally , the Mitsubishi PFD units employ inverter-driven compressors and not digital scroll compressors as per the norm . Minimal ( if any ) humidification is required , which saves additional water .
The system uses high-efficiency inverter compressors and DC fan motors . In addition to this , the system is equipped with a heat interchange circuit , which provides additional subcooling , improving the capacity of refrigerant delivered to the expansion device .
It is notable that the outdoor unit has a guaranteed ambient operating range of between -20 ° C and + 52 ° C . The system is also equipped with an electrical noise filter circuit protecting the electronic circuits of the system . This means that no additional third-party protecting devices are required .
The electrical noise filter circuit protects against over- and under-voltage conditions , and is equipped with an auto phase correction facility . The system is also programmed for a quick auto power recovery .
The project achieved Tier III Certification from the Uptime Institute in March 2020 .
The project team : Client : Orange Botswana Lead consultant :
AOS-GBK
Mechanical and fire : AOS Engineers
Architect : GBK Architects
Electrical engineer : Onezero Consulting
Contractor :
Concor
Participation in the next CESA AON Awards is encouraged and nominations under this category can be made directly to CESA when open . RACA
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RACA Journal I February 2021 www . hvacronline . co . za