Automation and visualization (SCADA) of multi-storey houses heating supply in the Latvian city Broceni (Broceni city)

Used controller: based on Tiny Tiger (Wilke Technology GmbH)  Danfoss Comfort ECL300.

Used visualization program: General Electric Cimplicity .

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The main objective of this project was to switch all individual heating junctions of the multi-storey houses in a united network in order to ensure continuous data registration (heat counter indices and parameters of the heat regulators), as well as to create opportunity to perform change of parameters via central operator point (the computer), obtaining the necessary room and water temperature. Gathered information allows to analyse and optimise performance of the whole centralised heat delivery and distribution system as well as to diagnose potential faults in the operation of central heat supply system.

The network connects more than 70 houses in the city of Broceni. Information exchange between heating junctions and the central operator point- the computer- is ensured via MODBUS protocol. Each house in the network is a Modbus RTU slave with its individual address. The Modbus master is a PC in the operator room. Heating junctions (Slaves) are sequentially polled by the master with the help of software. After each such command, data control and transmission system transfers information to the central operator console. Commands are sent out approximately once a second, so the polling period for all system takes about 70 seconds.

All heating junctions are connected with a twisted pair cables. The entire cable network is divided into 8 segments by optically isolated repeaters so that each cable segment has a line structure. The common length of the cables, lied into the ground together with the main heating pipelines, is about 8 km. Cable connections is not the only way of information exchange. Radio, GSM or telephone communications, as well as the signal transformation through the supply voltage net connection lines could also be used, depending on the situation.

Heating facility structure

Each house has an individual heating junction, which consists of two devices, linked with information exchange (not taking into account the pipes, heat exchangers etc.):

  • heat counter (type Elkora B34), which measures the temperatures and energy consumption on the primary side of the heating facility (common pipeline rout side);
  • heating regulator (type Danfoss ECL300), which measures and maintains the temperatures on the secondary side of the heating facility in the heating and hot water circuits of the house according to the setpoints.

It must be remarked, that also other types of heat counters and heating regulators could be used, and they can be of different types connected in one net.

Each of the above mentioned devices have an RS232 port for information exchange with its own specific exchange protocols. In order to ensure information exchange with the devices and to maintain communication with the master, a special controller, based on Tiny Tiger Economy (the product of Wilke Technology, GmbH) is used in each heating junction. Each heating junction is pooled from controller and sends data to the computer - central operator panel. The communication between controller and computer is realized with the help of MODBUS protocol.

The process visualization programme

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The process visualisation programme is based on General Electric software Cimplicity as design tool. A MODBUS OPC server programme from "Matricon" manages with the communication between controllers and the computer. The process visualisation programme of central operator panel carry out the following functions:

  • The database formation for the parameters of heat counters and heat regulators;
  • The selected heating facility visualisation according to actual or archived data. This information can be in graphical or in a table form;
  • Change of the set value for selected temperature from the computer.
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The current situation about each heating junction can be derived with the help of navigator. The instant navigator presents all heating junctions in the table form according to addresses of the houses. By clicking on the selected address the image of the heating junction is derived, in which values of the temperatures, heat counters and summary consumption values are displayed. Beside that, the following time dependent changes of heating parameters are displayed in the graphical form:



  1. The primary side of heating junction
  • The direct flow temperature in the input;
  • The back flow temperatures of room heating and hot water heat exchangers.
  1. Heating circuit:
  • The direct flow temperature;
  • The day and night setpoints in the heating regulator;
  • Summary heat consumption;
  • Outside temperature.
  1. Hot water circuit
  • The direct flow temperature;
  • The day and night setpoints;
  • Summary heat consumption.

Each time period from the past can be easy observed by clicking on a special moving cursor of the time axis.

Web viewer - a special Cimplicity option - allows to access all data on the Internet via any web browser program.


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