Datacentre supplies local heating in Mäntsälä, Finland
The city of Mäntsälä located approximately 55 km north of the Finish capital Helsinki, installed a heat pump capable of supplying 1500 homes with heating. The heat pump extracts heat from a nearby data centre.
Hot air from data centres holds a huge potential for energy recovery. By removing the air and utilizing the excess heat it can be used in local district heating networks. In 2015 Mäntsälä installed a 4.0 MW heat pump which utilize the excess heat from the local Yandex data centre.
Heat exchangers extract hot air from the data centre servers at temperatures of approximately 40°C. This is used in the heat pump, where the temperature is increased to approximately 85°C. The heat pumps are optimized to achieve high temperatures hereby having a high COP, which potentially can be above 4.0. The heat pump does not affect the design of the data centre, as energy is harvested from the outgoing airstream. Extra fan-power is merely added to the building to extract the heat from servers.
By extracting waste heat from the computing centre, 75 % of the energy originally used can be reused. Further, the excess heat replaces natural gas heating and hereby reduce the annual CO2-emission with approximately 4000 ton CO2 in the first years, which later can be up to 11,000 ton CO2. Currently the heat pump can supply 1500 homes with heating through the district heating network. Later, as the district heating network is to be expanded, this number can rise to about 4000 homes.
Facts about this case