Sontay helps lift energy efficiency at Eden
The Eden Project in Cornwall, one of the UK’s largest visitor attractions, has undergone a site-wide upgrade of its Building Management System (BMS) to enable control of multiple buildings and the iconic Eden biomes. The installation features a number of Sontay’s temperature, humidity, CO2, pressure sensors and other devices, chosen for their reliability, accuracy and ability to work in critical environments.
The aim of the upgrade was to provide an easy to maintain system that also helped Eden save energy. As a result, Eden is now one of the first projects in the world to fully integrate horticultural and building control systems.
Kevin Bate, BMS Technician at the Eden Project explains: “The purpose of the installation was to provide Eden with an ‘intelligent steering wheel’ to control all of the plant room equipment, including the heating and venting systems of the Biomes under one complete networked IP LAN system. The BMS also provides a method to monitor and intelligently control systems to save gas and electricity, substantially reduce energy costs and our carbon footprint.”
Completed over a two year period, the Eden Project commissioned greenhouse systems specialist, CambridgeHOK, to fit the completely new control system. A new Priva BMS was installed containing 66 IP LAN based controllers, which are responsible for the heating of many buildings, controlling the Energy Centre for hot water and the total control of the Biomes for heating and ventilation. As part of the new control system, Sontay products were used throughout the site to measure and deliver reliable data and other inputs to the new Priva controllers.
The project was undertaken in three different phases. Phase one included replacing all of the existing controls in the Energy Centre, Visitor Centre, kitchens and restaurant, office block and education centre. The next phase was to replace all existing controls in the Biomes, making improvements to energy efficiency and environmental controls including mechanical engineering works.
The final phase is a continual long term phase which involves the provision and installation of sensors and intelligent controls on site-wide pumping equipment for water management and remote alarm monitoring.
A total of 66 Sontay TT-522 duct temperature sensors were specified which were used in 33 air handling units (AHUs) within the Biomes.
Sontay PL-511 Pressure Sensors also feature on the project. These devices quantify heating ring pressures up to 10 Bar, which control inverters on the 45KW pumps in Eden’s Energy Centre. Sontay PA-930 DP Air Switches were installed on the building’s AHUs to detect positive fresh air flow or negative extract air. The Link Building bakery fresh air ventilation unit uses an AV-DSP Single Point Air Velocity sensor to measure air speed and the bakery itself uses GS-CO2-RHT sensors fitted to the walls to measure temperature & CO2 ppm as more visitors use the area. These sensors provide direct feedback to intelligently control AHU fan speeds in the plant room. The GS-CO2-RHT sensors use a non-dispersive infrared sensor for measuring CO2 and the self-calibration algorithm offers long term stability and accuracy, vital for measuring environmental parameters in these critical spaces.
A number of EP-SW72 Fusible Thermal Links are installed above the boilers for over-heating protection in plant rooms.
Kevin continues: “Duncan Grant at CambridgeHOK recommended Sontay and, now that the products are installed, we can see their quality and we are very happy with them. Some Sontay sensors are located in quite inhospitable places with respect to temperatures and high humidity, so we need reliable, accurate products for critical control.”
The BMS installation has helped create a more comfortable environment for staff and visitors as well as substantial energy savings and alarm monitoring. It was also winner at the BCIA awards 2012 for “Technical Innovation of the Year” a joint award between CambridgeHOK and Eden Project.
Sontay will be exhibiting on stand D1 at Building Controls Sandown Park