BMS is a critical system for Cisco’s operations in Bedfont Lakes. Not only does it monitor and control traditional commercial facility systems providing for occupant safety and comfort, the BMS also manages the HVAC systems that supply cooling to Cisco’s labs, the heart of Cisco’s solution development and support. Prior to the installation of the Metasys™ system, the buildings in Bedfont Lakes were operating on an outdated and no longer supportable BMS. The replacement with the Metasys™ system now provides Cisco with a highly supportable BMS platform with available parts, service and a long-term commitment to enhancements and migration.
Lighting Control and
provided all of the building services data from a range of disparate building systems such as the HVAC plant, lighting controls, energy metering and remaining elements of the legacy BMS, to provide control through to Cisco’s SDP. This is a dynamic solution that Cisco uses to interact with their business systems such as email, calendar, energy analytics, and carbon reporting.
The interface to the Cisco SDP application utilises the open protocol oBIX (open Building Information Exchange) so Johnson Controls provided, installed, and configured a gateway solution using the Soft Jace AX system (Software Java Application Control Engine, AX is reference to the current revision).
The S+CC system at Bedfont together with the Johnson Controls MetasysTM system form a common seamless operating platform for the BMS, lighting, fire monitoring, and energy metering; it also forms the link between the BMS system and Cisco’s SDP via the oBIX interface. The S+CC at Bedfont along with the AX/MetasysTM System carries out high level energy monitoring and control of lighting and HVAC in the conference rooms.
Supportable System
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Daylight Harvesting Integrated to the Metasys™ BMS is a lighting control system with sensors in each conference room, which controls the lights based on a combination of inputs. The lighting control system uses DALI and was installed as part of the Johnson Controls scope of work. In addition to the typical control scheme based on occupancy and the momentary light switch in the room, the BMS also receives commands from the IP phone in the room via the SDP. Lights in each conference room can be set for use in combination with overhead projectors and can be set to 25%, 50%, 75% and 100% of full brightness.
The lighting control solution also allows for daylight harvesting in the open office areas. During illuminated times the lighting will be dimmed to meet the current room lighting set point as outside light becomes more intense, enabling daylight harvesting for that room.
HVAC and Thermal
Energy Metasys™ was used to collate and manage the measurement of thermal energy used by the buildings. Metasys™ is able to calculate energy consumption associated with the use of hot and chilled water in the HVAC systems. The information is supplied dynamically to the Cisco SDP for early identification of problems and management of energy consumption.
In a similar manner to the lighting, the Metasys™ and SDP coordinate to manage the temperature of the conference rooms. When the building is unoccupied during nights and weekends, the BMS uses the unoccupied temperature set point for the entire building. However, during occupied hours, the set point for the conference room is established by the SDP which informs the BMS of upcoming meetings scheduled in the room. If a meeting is scheduled the BMS uses the occupied set point and when no meetings are scheduled, the BMS uses a standby set point, which allows the BMS to rapidly heat or cool the room should the room become occupied.
Energy Conservation
Scheme An important element to the success of an S+CC facility is the ability to monitor overall and sub-metered energy consumption enabling higher productivity of the building and the potential for energy savings and carbon emission reduction. All electrical circuits are metered for consumption and all electrical circuits fall into one of the three measurable categories, lighting, HVAC and plug load. The facility energy usage is also segregated between office and lab areas.
To facilitate these measurements, new multi circuit meters were installed and connected directly to MetasysTM. Integration of the Johnson Controls MetasysTM with CISCO’s EnergyWise protocol, allows for the measurement and verification of 94% of the building energy consumption. Thus enabling Cisco to receive and control data from both CISCO’s IT infrastructure as well as from their building services.
With Return on Investment (ROI) savings’ projected at £120k per year per building through ongoing collaborative works with Accenture, Johnson Controls has made valuable energy data visible to CISCO from the site level facility management team to the corporate level sustainability group through the CISCO SDP.
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