PORVOO CENTRAL SCHOOL 

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The installation of new energy technology at Porvoo Central School, led by IOTOI Oy, benefits the energy company and the property owner.

More than 90% of the heat energy used by the Central School is now taken from the district heating return pipe using the PIP3-method of the circular economy era. Utilizing return heat decreases the temperature in the district heating network, which most energy companies aim to improve power plant efficiency and reduce combustion.

The PIP3-method also makes it possible to connect waste heat sources to the return pipe. In this case, it is unnecessary to warm up the waste heat to high temperatures of the supply pipe, substantially reducing the electricity consumption of heat pumps. When the return pipe works as a waste heat supply and distribution channel, all the recycled heat reduces the need for combustion in the power plant. The method opens up completely new opportunities for modern district heating business models.

The heating and ventilation of the Porvoo Central School are controlled by CO₂- and temperature sensors. Based on collected data, the automation optimizes the energy consumption according to the actual need, depending on room occupancy and outdoor temperature.
 
In September-November 2020, the school consumed 160 000 kWh of electricity. In the corresponding period this year, only 92 000 kWh. Electricity consumption has fallen by more than 40%.
 
According to financial statements in 2019, the City of Porvoo paid 157 000 € for energy (92 000 € for district heating and 65 000 € for electricity). 
After the IOTOI installation, the expected annual saving on energy costs is 60 000 € (37 000 € for district heating and 23 000 € for electricity).