Large Heat Pumps in Europe: Vienna district heating

| A high-temperature heat pump is used to boost the capacity of the city’s district heating system.

Vienna is the capital and largest city of Austria with a population of about 1.8 million people. One third of all residences in Vienna are supplied by district heating. By using a 255 kW high-temperature heat pump supplied by Ochsner, the capacity and efficiency of the Vienna district heating system is increased, without enlarging the capacity of the power plant, respectively of the boiler. Therefore, in this example, the return line of the district heating system, with a temperature level of about 45°C is used as heat source for the heat pump. The heating capacity of the heat pump is used as a supply line for a secondary system, with a temperature that ranges between 70 and 85°C, but the same device can also supply flow temperatures of up to 98°C. The heat pump achieves an annual COP of 5,3, and uses the non-flammable and non-poisonous refrigerant ÖKO 1.

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