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District Heating

Germany: First Record-Size Solar District Heating Plant in 11 Years

Submitted by Baerbel Epp on September 27, 2016
Senftenberg GermanyFriday, 23 September 2016, was the inauguration date for the now largest solar thermal collector field in Germany. Since August, 8,300 m² of vacuum tube collectors (5.8 MWth) set up in the town of Senftenberg, 140 km south of Berlin, have been feeding energy into the municipality’s district heating network. The previously largest field since 2005 – a 7,100 m² flat plate collector installation (5.1 MWth) – is located in the southern German town of Crailsheim. The new Senftenberg solar field was designed, manufactured and implemented by German system integrator Ritter XL Solar. The 1,680 collectors, the heat transfer unit and around 6,600 m of pipework were installed within record time: All in all, the project took only six months. The general contractor for the EUR 4.5 million investment was Berlin-based E&G Energiebau, which had received support from the Integral Project, the company responsible for sizing and integrating the solar heat into the existing network. 
Photo: Stadtwerke Senftenberg
 

District heating: “The industry is very optimistic about its future prospects”

Submitted by Baerbel Epp on September 23, 2016

Ralf Roman SchmidtDistrict heating has a long history in Scandinavia: The international symposium on district heating was launched there in 1987. In the meantime, the technology has reached the global stage and the 15th International Symposium on District Heating and Cooling was the first one supported by the IEA District Heating and Cooling programme (IEA DHC). Dr Ralf Roman Schmidt had been invited to speak at this two-day conference held in South Korea in September and attended by more than 200 people. The research engineer from the AIT, Austrian Institute of Technology, is about to become Austria’s alternate country representative within the IEA DHC.

IEA SHC: Attractive Solar Solutions for Urban and Landscape Planning

Submitted by Baerbel Epp on September 15, 2016
Case Studies Task 51How can urban planners be convinced to consider solar energy technologies in municipality projects? This is the key challenge faced by the international group of researchers of Task 51, Solar Energy in Urban Planning. One way to attract interest from these planners is to present them with case studies of successfully implemented solar projects. So the members of Task 51 headed by Maria Wall, Professor at the Energy and Building Design department of Sweden’s Lund University, have collected around 40 solar case studies and are about to design a brochure for all of them. The authors distinguish between three types of studies: new urban areas, existing urban areas and landscapes.
Image: Task 51
 

Denmark: Arcon-Sunmark Announces Silkeborg Solar Plant Development

Submitted by Baerbel Epp on August 19, 2016
On 13 July, Arcon-Sunmark, the Danish large-scale solar heating specialist, officially announced that as the chosen turnkey provider, it was beginning construction on the 156,694 m² solar district heating system (110 MWth) on behalf of the Danish city of Silkeborg and its district heating company Silkeborg Forsyning. The plant is scheduled for completion by the end of the year and will then be the largest solar district heating system worldwide.
 

TASK 45 / 55: Guidelines on How to Design Seasonal Storage

Submitted by Baerbel Epp on August 1, 2016
Bore Hole StorageSeasonal storage is a key component in the transformation of today’s energy industry. Besides storing energy in summer for heating in winter, it can also be used to save waste heat from the industry and to increase the electricity production from biomass CHP plants. Experiences gathered with the technology during case studies were summarised as part of the study Seasonal thermal energy storage – Report on state of the art and necessary further R+D, which was published by Task 45, Large Scale Solar Heating and Cooling Systems, of the IEA SHC programme. Together with the Guidelines for Materials & Construction on the two most common storage types, borehole (see the chart) and water pit, it provides a good overview of the current advancements in this field (all three documents attached). Additional research into the design of seasonal storage will be carried out in follow-up Task 55, Towards the Integration of Large SHC Systems into District Heating and Cooling (DHC) Network. Interested stakeholders have been invited to join the kick-off meeting of Task 55 in Graz, Austria, between 19 and 21 October (see contact details below).
Chart: TASK 45
 

Switzerland: PVT System Output Reaches 330 kWhth/m² on Top of 163 kWhel/m²

Submitted by Baerbel Epp on July 29, 2016
PVT OberfeldCrystalline PV modules utilise only 12 to 15 % of the incoming sunlight, while the rest is usually treated as waste heat. Hybrid solar panels, also called PVT elements, will channel this unused low-temperature heat, as shown by a large-scale demonstration plant in Switzerland. The PVT system’s 1,300 m² are used to regenerate a borehole field in a Swiss multi-family housing area. Monitoring data of the system’s first year in operation between August 2014 and July 2015 resulted in an annual thermal yield of 330 kWh/m² in addition to the 163 kWh/m² of electricity produced by the PV modules, according to a statement made by researchers from the Swiss SPF – Institute of Solar Technology earlier this year. The borehole field serves as the energy source for the heat pumps, which supply hot water all-the-year and space heating in winter. Most probably, the recommendations that the SPF researchers made to optimise the system in a paper published in May 2016 will even lead to a higher thermal yield during the installation’s second year. 
Photo: SPF Rapperswil
 

Top District Heating Countries – Euroheat & Power 2015 Survey Analysis

Submitted by Baerbel Epp on July 1, 2016
Euroheat & Power LogoSolar district heating has enjoyed increasing attention from all across Europe and China, triggered by Denmark’s enormous growth rates in the field. Until the end of last year, the Scandinavian country had seen 577 MW of solar thermal power fed into 79 district heating networks mostly run by municipalities. There are another 364 MWth in the pipeline, scheduled for the beginning of this year. To identify the countries with the largest potential for solar district heating, it is worth taking a closer look at the country-by-country statistics of the biennial Euroheat & Power publication, whose most current version is from March 2015 and includes the key market indicators. Euroheat & Power, the association for district heating and cooling, is headquartered in Brussels and has 11 full-time staff.
 

Denmark: Solar Concentrating Systems to Offer Wide Array of Uses

Submitted by Baerbel Epp on June 20, 2016
Aalborg Tars InaugurationAt present, the Danish turnkey supplier of concentrating solar systems, Aalborg CSP, has two more large projects under construction. Both installations – one for Danish district heating company Brønderslev Forsyning and one for Australian vegetables producer Sundrop Farms – cover electricity and heat demand at their sites. Yet another first-of-its-kind project was inaugurated in August 2015 in the Danish village of Tårs (see photo), 30 km north of Aalborg. It entailed 4,039 m² of parabolic trough collectors and a preheating flat plate collector field of 5,972 m². Simulations have pointed to a 31 % coverage of annual heat demand even without seasonal storage, since overheating in summer can be avoided by moving the parabolic trough collectors out of focus. Aalborg CSP is an experienced planner of steam and boiler systems and has been offering concentrating solar solutions since 2007. 
Photo: Tårs
 

Austria: Decision on Operating Company for Big Solar Graz Expected Soon

Submitted by Baerbel Epp on June 17, 2016
Gleisdorf Solar 2016“Large-scale solar thermal systems in the GW range – an insignificant niche market or the future for solar thermal?” was the official title of a panel discussion at the Gleisdorf Solar conference in Austria in early May. The most important question was: What will be next for the planned 350 MWth solar district heating system called Big Solar in the Austrian city of Graz? “The challenge was to adapt the Danish district heating solutions to Austrian conditions,” emphasised the project’s initiator, Christian Holter (right), Managing Director of S.O.L.I.D. Meanwhile, Christian Stadler (left), Managing Director of one of Arcon-Sunmark’s subsidiaries, Arcon-Sunmark Germany & Austria, represented the company that has stated his own interest in realising Big Solar.
Photo: AEE INTEC
 

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