The main case of heat recovery is from a data center which has been in operation a few years. The construction of the new data center in Denmark starting in 2017, was determined to be one of the most advanced, energy-efficient data centers in the world. 
The new facility features the latest hyper efficient hardware, cooled using outdoor air through indirect evaporative cooling technology and powered by clean and renewable wind energy. The facility is unique because of the infrastructure to capture and recycle the excess heat generated by the servers to provide heat to the local community. The heated air from cooling the servers flows via water coils, recovering the heat by raising the temperature of the water. This water is then supplied to a newly constructed Heat Pump install ...