Eibiswald District Heating

Eibiswald District Heating: Overall efficiency increase via solar and storage solution

The 2,265 m² of collector area can cover up to 100% of the heat demand during the summer.

The installed heat storage, with a capacity of 165 m³, results in an overall efficiency increase via energy management.

The district heating grid operator Nahwärme Eibiswald heats its district heating grid via a wood chips heat plant.

Wood chips are 100% CO2 free but are still subject to fluctuating purchase prices. As the biomass boiler could not be operated in the low-load range, an alternative had to be found. While an oil boiler was out of the question, a solar option with a constant heat price was an attractive alternative. In 1997 Nahwärme Eibiswald installed its first district heating solar plant. With the installed collector area of 1,150 m²/12,379 ft² and solar heat storage volume of 105 m³/27,740 gal, Nahwärme Eibiswald was able to cover up to 90% of its heat demand via the solar thermal plant during the summer months.

Over the years the district heating grid and its energy demand grew constantly, resulting in a necessary extension of the existing solar system to keep a high solar heat coverage during the summer months. In 2012, an additional 1,115 m²/12,000 ft² of advanced high-temperature flat plate collectors were installed. The hot water storage volume was increased by 60 m³ / 15,850 gal.

SOLID evaluated the existing heat demand profile, and solar yield data of the initial solar plant, as a basis for the engineering of the solar extension.

The existing local wood chips drying plant (operated via circulation of outdoor air) was upgraded with an air-water heat exchanger, and integrated into the solar supply system. In this case, valuable solar heat overproduction can be used for the drying process.

Technical Specifications

Comissioning
2012

CO2 Savings
300 t/a

Collector area
2265 m²

Storage
165 m³

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