Project
BUILDING MANAGEMENT SYSTEM The BMS is essentially an HVAC-only management system , as it does not have any monitoring or alarming functions with regards to electrical plant , hot water generation , access control or vertical transportation services .
The BMS is based on a state of the art Tridium Niagara Framework platform , which resides on an IP backbone which is installed throughout the buildings . Each main plant room has control panels which house controllers , and the points monitored are attached to these controllers .
The following HVAC plant is controlled and monitored by the BMS :
• Chiller plant : critical chiller functions monitoring and alarms , control of secondary chilled water pumps .
• Basement ventilation : CO monitoring and fan speed control .
• Chilled water energy monitoring .
• Hotel Restaurant AHU metering and VAV control .
• Hotel admin . / BOH AHU monitoring and control .
• Various ventilation fans monitoring , control and alarming .
The guest room and office air conditioning fan coil units are all on stand-alone control ( not monitored or controlled by the BMS ).
WSP
Figure 5 : An example of a BMS graphic – AHU-H1 .
GREENSTAR INTERVENTIONS Rabie Property Group stated from the outset their intention to achieve a 5-star Greenstar rating for the Bridgewater development . PJ Carew were appointed as the Greenstar consultants , and from the concept design stage , they issued a list of interventions to be targeted by the various services consultants .
In terms of the HVAC design , such interventions included , inter alia :
• Minimum fresh air quantities for the offices and retail tenancies , as well as hotel guest rooms to be 66 % above the SANS10400 requirements .
• Minimising of noise levels in hotel guest rooms .
• Use of high efficiency water cooled chillers .
• Thermal energy metering and sub-metering .
• CO sensors to control parking exhaust fans .
• Use of zero ODP refrigerants in chillers , VRV and split DX units .
RACA Journal | Benjamin Brits
The rooftop view of the cooling towers and fresh air fan .
RACA Journal | Benjamin Brits
An example of the ‘ exposed style ’ finish in one of the completed offices .
RACA Journal | Benjamin Brits
The open kitchen canopy and pizza oven extract fans of the hotel .
www . hvacronline . co . za RACA Journal I January 2022 41