Energy management systems

The complex of buildings of the Polytechnic University of Zografou comprises installations of an area of 262,000 m², which are scattered over about 1,000 acres. The existing electricity supply network consists of installed low and medium voltage fields in which there are analogous voltage and current measuring instruments.

The measured quantities refer to phase voltage and current, active and inert power per phase, total energy as well as total power factor.

In addition to the Zografou Polytechnic complex, electricity meters have also been installed in the Patission complex in the Tositsa, Averoff and Mpoumpoulina buildings with a total area of 26,000 m².

In total, 70 energy meters are installed in the buildings of the two complexes. Data from the meters (kW, kWh, A, V, PF etc.) are collected at regular intervals (15′) and stored in databases.

In particular, to monitor energy consumption for heating, cooling and lighting, the following have been installed:

• 70 electricity meters

• 58 Power Converters

• 23 analog to digital converters

• 2 PLC

While to monitor the thermal comfort of a typical -pilot- office have been installed

• 4 temperature sensors

• 4 lux meters

• 4 Relative Humidity Sensors

To assess the comfort conditions in workplaces, four temperature/humidity measuring devices were installed. in the reception area of the secretariat of the School of Mechanical Engineering The temperature sensor is PT100 type with a measurement range of -20 to 100 °C. The humidity sensor takes measurements of absolute humidity, dry and wet bulb temperature, with a measurement range of 0 – 100%RH, accuracy

±1.5%RH and 0.1% RH instrument resolution.