Case

Large Scale solar heating in Marstal

Ramboll

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Ramboll is a leading multidisciplinary independent consultancy company Our 1,500 experts in energy provide our customers with cost-effective energy and climate solutions that meet today’s standards. We are among the leading consultants in the world within important energy, climate mitigation and climate adaption services: •Sustainable development of liveable cities •Least cost energy planning and strategies •District heating and cooling •Combined heat and power •Heat pumps •Waste to energy •Large scale solar water heating •Thermal storage tanks and storage pits •Wind farm infrastructure on and off shore •Power grids •Integrated smart energy system •Climate strategies •Waste management •Biogas •Exploration of oil and gas •Natural gas transmission and distribution •Natural gas storage Our multidisciplinary approach also includes other renewable sources, hydro power, geothermal energy, energy efficiency in building and industry and low energy buildings. Furthermore, Ramboll’s experts address global water and climate challenges by working across the water cycle from water resources and supply, processing and treatment, to sewerage and discharge. Working with municipalities, utilities, and industrial clients we draw on multidisciplinary expertise to create innovative, sustainable and liveable solutions for our customers and society. Our more than 700 water consultants – mainly engineers, hydraulic specialists, water consultants and landscape architects, but also economists, legal advisors and management consultants – work with water projects on a global scale with more than 50 years of proven experience. Discover more in this video about Ramboll's global water practice. To learn more about Urban Energy Solutions, see Rambolls blog

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Marstal District Heating, a traditional consumer-owned district heating company with approx. 1,650 consumers.

The company has designed and built a solar heating plant consisting of more than 33,360 m2 of solar panels as a supplement to heat production based on biomass (wood chips). For years, it was the largest solar heating plant in the world, and still ranks among the largest. The solar panels cover up to 50% of the annual heat production. The latest extension included a new 75,000 m3 water reservoir for heat storage. The water is heated by the sun through the solar panels during the summer and stored for use in the winter.

The company has played an important role in the development of the technology for large scale solar water heating plants and underground pit thermal hot water storages which can store water up to 95 dgr.C.

The plant has developed in steps to test the technologies. First 18,000 m2 in two steps. then new 10,000 m3 pit heat storage and latest an extension to 33,360 m3 and an new larger pit storage.

Ramboll has provided consultancy services for system design, procurement and implementation for part of the plant

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