Ystad Arena is located in the southern Swedish city of Ystad, and is the home arena of Ystad IF HF which is one of the country’s top handball teams. On its roof, 36 collectors from Savosolar were mounted during spring 2017. The system is owned and maintained by the municipality owned energy company Ystad Energi AB, and feeds its district heating network with clean thermal energy. Ystad Energi AB is working towards the goal of becoming fossil fuel free by 2020 and currently produces ca. 160,000 MWh of thermal energy annually, of which 97-99% are based on bio-fuels.
As much as 89% of the thermal energy for the district heating network is produced by four wood chip burners between 3 and 10 MW capacity and the rest is produced from straw, rapeseed, gas and oil. Ystad Energi AB has ca. 1,850 customers, of which ca. 1,300 are single family homes.
Jelling Varmeværk is a Danish district heating plant in the historical village of Jelling, which is the former home of the Viking Chief Harald Bluetooth. Apart from the 20,125 m² collector field, Jelling Varmeværk produces its energy from a 1 MW wood chip boiler, a 1.5 MW absorption heat pump and 2 gas CHP engines with a total capacity of 8 MW heat and 6 MW electricity.
The first solar system was commissioned in summer 2016 and during its first week of operation, the collector field set a new Danish record by producing nearly 5 kWh/m² in a day.
The collector field in Jelling has double stanchions which allows for two collector rows to connect to one and the same pipe and thereby save costs and thermal losses. The annual solar thermal production is about 11,200 MWh, which covers over 25% of the town’s energy need for heating.
In 2018, Jelling Varmeværk placed a second order with Savosolar for the 4,836 m² extension of the successfully running existing collector field. The extension will be installed in first half of 2019 and it will further grow the fraction of district heating produced with solar energy.
“We chose Savosolar as our collector supplier due to their high efficiency in combination with their innovative solutions. They enable us to have an environmentally friendly, stable and low price for heating over the next 20 years. Collectors have integrated hose connections which means that they disturb the landscape as little as possible in an historic village of Jelling. The collectors can also follow the curvature of the landscape which means that we didn’t have to level out the ground of the field.”
FORS A/S is an energy company owned by three Danish municipalities. Their district heating plant in Jyderup has about 900 customers and produces about 5000 MWh solar thermal energy per year. For the rest of its energy production, the plant uses two gas boilers with 7 MW thermal capacity and two gas engines with 6 MW electrical capacity.
In Jyderup, the collector field is a so-called hybrid field, with both single and double glazed collectors. The single glazed collectors are in the cold end of the collector rows and increase the low temperature as rapidly as possible, while the double glazed collectors are located in the warm side of the collector rows where it is more important to reduce the heat losses. The collector field also has double stanchions which allows for two collector rows to connect to one and the same pipe and thereby save costs and thermal losses.
As a general contractor, Savosolar built a solar thermal system on behalf of Fernwärme Ettenheim GmbH for the largest possible solar feed-in into the existing district heating network. 112 pieces Savo 15 SG-M large collectors generate fuel-free healthy heat, which is temporarily stored in two 100 m³ buffer storage tanks.
This also allows the operating hours of the CHP and the biomass boiler to be optimized. The scope of delivery included the fence and video surveillance system, as well as the creation of a meager meadow to enrich local biodiversity.
The construction work was temporarily interrupted due to the COVID19 restrictions. All system hydraulics were completely housed in a container. The keys were handed over in October 2020.
A PV system still to be built on the east side will generate the electricity for the pumps in the future.
The picture on the left shows the boiler house and the buffer storage tank. Handover of keys from Jari Varjotie, CEO Savosolar Oyj, to Peter Blaser, managing director of the customer.