|Type of building
|Number of KNX devices
||The Centre for Medicine campus will be home home to the College of Medicine, Biological Sciences and Psychology departments. Covering 12,836m2, it will provide teaching rooms, offices, lecture theatres, dry lab research facilities, and support spaces to more than 2,350 staff and students.
More than one third of the new centre will be dedicated to research and provide a central point for the university’s world-leading academics.
It is UK's largest non-residential project built to the ultra-energy efficient Passivhaus standard and is designed to be up to ten times more energy efficient than a normal building of the same size.
The University of Leicester's new Centre for Medicine will replace an existing building on the same site and has been designed to reduce annual energy bills by 80%.
Passivhaus buildings provide a high level of occupant comfort while using very little energy for heating. This requires very controlled and well designed control algorithms to ensure maximum efficiency
|Main technical highlights
||Integration to enable energy efficiency-all devices are integrated on one platform. Heating, cooling, lighting, solar control are all controlled via the same control data and algorithms.
Complete integration of large scale BMS and field control. The BACnet headend that controls plant receives all the KNX field data for room temperature, occupancy, slab temperatures, lux levels, solar gain, sun position etc are fed back to ensure the best overall building control decisions.
Huge reduction and capital saving compared to traditional install. One KNX cable into a room for all control services!
|Benefits of KNX
||KNX has allowed the building to be controlled to passivhaus standards to a scale never achieved in the UK before. To achieve passivhuas levels of energy efficiency the buildings heating control and control of lighting, solar radiation,c02, natural vent etc all need to be controlled in relation to one another. KNX allows every element of the building control to be integrated and building wide control decisions to be taken and local control decisions to be made that focus on maximum energy efficiency gains.
KNX also feeds back all the integrated data to allow plant control decisions to be made.
|Which functions were realised with KNX
||Integrated Room controller(temp,lighting,C02,blinds,natural ventetc): Siemens QMX
Slab cooling:Arcus EDS Temp/humidity sensor for slab soffit and internal temp and humidity, Theben Cheops for valve control
Lighting control:Siemens DALI gateway w/Osram DALI PIR, Theben thePrema & theRonda PIR,
C02 control:Theben Amun716
Blind and solar control: Theben meteodata 140GPS, ABB JRA/S blind controller, Theben thePrema PIR
Radiator control: Theben Cheops
Fan Coil H&C: Siemens RXB
VAV control: Siemens VAV GLB181
lecture theatre control: RS232 interface
Atrium vent control: ABB sa/s
||Complete building DALI led control with daylight dimming, presence, absence detection, scene control, lecture theatre lighting control into AMX system.
Architectural fittings controlled on switch actuator channels.
External lighting control
Scheduled lighting control from front end
||Individual room internal black out and external solar shading control. Occupancy signal from PIR to set automatic mode based on weather station data of sun position, height, intensity etc
When rooms are unoccpuied they act as a complete facade and operate together to reduce impact of solar gain
Integrated with room temperature feedback from KNX room controller to utilise solar gain if room below temp or to reduce solar gain if over temp.
Schedule used to determine building wide operational mode of solar/blind controllers
Building wide alarm for wind, frost, rain to override all for safety.
|Heating, ventilation, air conditioning
||Zoned UFH control via KNX room controller,occupancy, time schedule and Theben Cheops for valve control.
Fan coil heating and cooling based on occupancy, room temperature, building mode on time schedule.
Radiator valve control based on occupancy, room temperature, building mode, room controller set point
C02 quality control utilising occupancy PPM, fan coil and natural vent control from VAV controller
VAV control provides fresh air based on C02 levels, occupancy, room temperature
Solar control of heating from blind controller and weather station data
||link to fire and security alarm to engage lighting to 100% output in event of activation
monitoring of critical alarms in comms rooms via volt free contact and temp sensors to specific alarm conditions
||KNX forms the entire field level control and data provision for the building wide BEMS.
All control data on occupancy, lighting levels, internal room temperature, C02 levels, solar levels, external lighting levels, wind speed, rain and frost alarms, blind position, ventilation actuator position and airflow, slab temperatures and humidity are all integrated with one another and with the BEMS to influence plant control decisions, building wide KNX control decisions and local room level kNX control decision.
|Audio / Video
||Interface to theatre AMX systems for lighting and scene control including activation of blinds
||Entire building alarming, data display, monitring functions are displayed on one comepltely integrated building BEMS head End.
Control decisions and monitoring of the entire system can be taken from this visualisation as can alarm handling.
A bespoke integration page developed between KNX/BACnet to indicate for each object the value received on the KNX side and the BACnet side to reduce complications of fault detection and rectification between integrated systems without requirement to have engineering knowledge of both protocols.
|Interfaces with other systems
||Interface of complete system to BMS provide for plant room control and building wide control from one point.
Interface with AMX system
Interface to fire and security alarm
||Remote access to entire building available to ETS platform or to Front End.
KNX apps provided to lecture theatre controllers
||Specialist slab cooling/night purge routine employed as part of passivhaus system.
This monitors the buildings concrete slabs for humidity and temperature within the slab and at its surface.
Monitored alongside room temperatures, external air temperatures and the temperature of the water running within the concrete slab and can exchange heat from the water to the slab if heating is required within rooms or remove heat from a room by running cold water through the slab.
humidity sensors are used to ensure water formation does not occur due to differential in moisture content and air temp