The police station in Rotorua on New Zealand’s North Island is not simply an administrative building. The architecture of the complex, which was inaugurated in 2014, should illustrate the role of the policy in the community. While the enormous laser cut screens point to cultural heritage, the robust palisades stand for law and justice. The building technology has also been considered very carefully. A fully up-to-date ‘automation and energy management system’ was implemented. The choice fell on KNX, an “open system which is modern, flexible and reliable” according to the system integrator.
Usually public buildings are maintained by several engineers. KNX complies with this requirement with its open standard as well as the fact that it is not necessary to be dependent on one manufacturer when selecting devices. The prerequisite for an application-wide energy management system are a wide selection of functionality and the simple integration of other systems and protocols. The KNX system with the applications of lighting control, energy management and smart metering is seamlessly integrated into the building management system via KNX / IP according to BACnet / IP.
Energy-efficient Lighting Control
A police station is occupied both day and night. An energy-saving, automatic lighting control system is therefore called for. During the day, the large windows and reflective surfaces bring natural light into the building. If this is not sufficient, a constant lighting control system supplements the required lux values through metered artificial light. It also promotes energy saving as presence detectors and time programs switch on the lighting when required individual areas. An astronomical time program adapts the outside lighting perfectly according to the seasons. Peak load management is also implemented via KNX. For optimum management of the energy use, all the usage is logged via the bus system, requirement analyses are created and the loads are controlled accordingly. If there is a potential overload, any unnecessary loads such as chillers are temporarily disconnected.
Through coupling with the HVAC via KNX / BACnet, KNX data is available for multiple uses. KNX presence signals automatically activate the comfort mode or standby mode of the room temperature control dependent on the presence or absence of the staff.
Rapid Remote Maintenance
The building management system (BMS) makes a graphical interface (GUI) available for the visualisation. The device status, all the values and logic functions are displayed. Floor plans with the position of the installed devices provide an overview. Documented processes and loads enable optimisation to be carried out in the building automation. The reliability of the building technology is compulsory in a police station. KNX collects fault messages, displays them via GUI and forwards them to the relevant engineers via SMS. The possibility of remote access to the KNX installation also ensures rapid maintenance. With the help of ETS tool software installed on a PC on site, it is possible to carry out diagnostics, program changes and configuration not only directly on site but also via the Internet.
Benefits of KNX in this Project