In the new city district Brunnshög in Lund the world’s largest LTDH network is being built. The network is based almost exclusively on fossil free surplus heat recovered from the MAX IV facility.
Lund is a fast growing city with close to 120,000 inhabitants, whereof 41,000 students and 7,500 researchers connected to Lund University. The city is also home to the research facilities MAX IV (basically a synchrotron radiation-based microscope) and the European Spallation Source, ESS (a new joint European particle accelerator).
In Lund there is a high activity to demonstrate the latest solutions in many fields, not least in the new city district Brunnshög which is being built right next to the research facilities. In 2060, when Brunnshög is fully developed, about 40,000 people will live and work there. The ambitions are exceptionally high – besides hosting the world’s best research and innovation environment the district will be a showcase for sustainable urban development.
The world’s largest LTDH network is being built
In Brunnshög, Lund’s energy and utility company, Kraftringen, is currently building the the world’s largest Low Temperature District heating (LTDH) network. It is based almost exclusively on fossil free surplus heat recovered from the MAX IV facility. The construction of the network started in 2017 and will continue to expand for as long as Brunnshög grows – eventually covering about 100 hectares of land. The network started to deliver heat to the first customer in September 2019, to “Möllegården” at Brunnshög’s Science Village.
The supply temperature in the LTDH network is 65 degrees Celsius, which can be compared to a normal average temperature of about 90 degrees. The reduced supply temperature brings more efficient heat production, reduced heat losses and that distribution pipes in plastic can be used instead of classic steel pipes. All this means that Brunnshög’s district heating customers can be offered a lower district heating price than normal.
Heat being used for new applications
Besides developing, demonstrating and evaluating optimized heat production and distribution technologies, the Brunnshög LTDH project offers the opportunity to develop new business models and test new exciting applications. In addition to heating homes, the surplus heat and the low-temperature network will be able to be used for things that not usually use heat for today. For example, the technology will be used to heat the ground at Brunnshög’s tram stops in the winter, so that snow cuttings are avoided. Other applications and technologies are being investigated in the EU-funded innovation project COOL DH.
• 65⁰C supply temperature
• 35⁰C return temperature
• So far, the LTDH network’s planned – and partly already built – length is 6.5 km, but it will become longer as Brunnshög expands.
• Start of construction: Autumn 2017
• Start of delivery: September 2019, to “Möllegården” at Science Village Scandinavia