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Visualization and control of the HVAC system at Kadriorg Palace in Tallinn, Estonia

September 24, 2014 | Bretislav Valek

Kadriorg Palace is a baroque building located in Tallinn, the capital city of Estonia. The palace houses the Kadriorg Art Museum, which displays, for example, paintings and sculptures from Western Europe, Estonia, and Russia.


In the summer of 2012, the renovation of the museum began. One of the main parts of the renovation was the modernization of the museum's HVAC system. The new SCADA-based system, which was implemented by the Imoko OÜ company, was required to meet strict requirements to maintain the desired microclimate in every exhibition room all year round (temperature: 20 °C ± 1 °C, humidity: 45 % ± 5 %). This goal was achieved by using a new complex system of four distribution boards operating thirteen recirculation AHU (air handling unit) systems, four AHU systems, two cooling stations, and one district heating substation.



Control system

To control and monitor the system, Beckhoff PLCs and Reliance SCADA are used. For data transfer between the PLCs and the monitoring computer, an internal Ethernet network with Internet connection and a Reliance data server (Reliance 4 Control Server) was built to allow the service staff to monitor the current situation from outside the control room any time they need.


In addition, a detailed data storing system with trends and reports was created to provide climate information from different museum zones to the art committee and representatives of future exhibitions.


The service staff is notified of any alarms via text messages using a GSM modem or via email messages, which allows them to react immediately if something goes wrong.


After adjusting and putting into operation, the new HVAC system fully copes with assigned tasks.





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