Vattenfall Wärme Berlin AG, a unit of Sweden-based utility Vattenfall, and Germany's Siemens Energy AG are currently building an 8MW high-temperature heat pump at Potsdamer Platz in Berlin to provide green district heating with waste heat and renewable electricity, and feed it into the German city's district heating network.
“The facility makes efficient use of renewable power from the local grid,” a Siemens Energy spokesperson told pv magazine. “Solar PV is not the predominant source in Berlin and direct coupling of heat pumps with solar without storage is a challenge, as heat pumps are more economical the more operating hours they accumulate. However, solar in general is an opportunity the more it penetrates the grid as it provides ever more economic and green power to feed power to heat facilities. “
The Qwark3 project – named according to the German acronym for “coupling of district heating, power, and cooling” – should begin commercial operations by the end of this year. Vattenfall and Siemens signed the agreement to build the facility in March 2021.
The heat pump is expected to provide 8MW of thermal capacity to the district heating network and delivers forwarding temperatures of between 85 C and 120 C. The high-temperature heat pump from Siemens Energy can deliver heat to the district heating network as required, even under cold winter conditions.