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District Heating, Heat Storage

Switzerland: Borehole Storage Regeneration as Solar Thermal’s Ray of Hope

Submitted by Baerbel Epp on December 22, 2016
Solarwärme SchweizOn 24 November, the fifth Solar Heat Switzerland (Solarwärme Schweiz) conference organised by the solar industry association Swissolar, the building services association suissetec and the Federal Office of Energy was held in Lucerne, Switzerland. As 2017 funding for solar heat incentives remains in doubt in several cantons and the priorities of the country´s energy policy haven’t been announced yet, the market outlook for solar thermal has not been very encouraging. But there seems to be a ray of hope in the form of low-temperature collectors for borehole regeneration and solar district heating. Click here to download the German-language presentations from the conference.
Photo: Swissolar
 

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
 

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
 

American Solar Works – Harness Your Energy for Your Business (2008)

Submitted by Raquel Ponte Costa on June 13, 2015

This document was prepared by the American Solar Works Holdings LLC. While it gives background information, it primarily tries to encourage solar thermal use for commercial buildings and businesses. Several commercial examples are used of what solar thermal can be used for including: heating hotel domestic hot water, providing showers for athletes and students, washing livestock, providing “green” clean clothes at a laundry mat, heating a building in the winter and augment your absorption chilling in the summer.

Heating Water with Solar Energy Costs Less at the Phoenix Federal Correctional Institution (2004)

Submitted by Raquel Ponte Costa on June 13, 2015

This report was released by the Energy Efficiency and Renewable Energy section of the U.S. Department of Energy in 2004. It highlights a large-scale solar thermal system installed at the Phoenix Federal Correctional Institution (FCI) and breaks down the statistical output. The system was financed through an Energy Savings Performance Contract (ESPC), which include an average annual savings of $6,700.

Canada Shines With Solar Expertise (2010)

Submitted by Raquel Ponte Costa on June 13, 2015

This paper was released by Foreign Affairs and International Trade Canada in 2010. The Vancouver Olympic Games showed large-scale success of solar thermal energy in Canada. Solar thermal modules supplied energy that supplied the Vancouver Olympic Village buildings and utilized it for other purposes. Estimates say that the buildings achieved 30 to 70 percent greater energy efficiency compared to standard buildings built to minimum code.

Heating Water with Solar Energy Costs Less at the Phoenix Federal Correctional Institution (2004)

Submitted by Raquel Ponte Costa on March 15, 2015

This report was released by the Energy Efficiency and Renewable Energy section of the U.S. Department of Energy in 2004. It highlights a large-scale solar thermal system installed at the Phoenix Federal Correctional Institution (FCI) and breaks down the statistical output.

Denmark: 37 MW Field with 203,000 m³ Storage Underway

Submitted by Baerbel Epp on August 30, 2014
Vojens Seasonal StorageConstruction has begun on another large-scale installation: This time, the new number one solar thermal plant in the world will be in Vojens, a small town in southern Denmark, near the city of Kolding. The customer is Vojens District, which signed a contract with Danish collector manufacturer Arcon Solar this May about delivering and installing a 37 MWth collector field (52,491 m²). The 4,166 collectors will all be produced in Arcon´s factory in Aalborg. At present, the seasonal pit heat storage with 203,000 m³ is underway: Vojens District is uploading pictures once a month and the ones from August show the lining of the huge water-filled basin with high-density polyethylene foil (see photo). The currently largest solar thermal plant, a 26 MWth installation with 61,700 m³ of seasonal storage, is located in the Danish town of Dronninglund.
Photo: Vojens District
 

Denmark: Dronninglund Inaugurates 26 MWth Solar District Heating Plant

Submitted by Baerbel Epp on June 1, 2014
Dronninglund1The world’s currently largest solar district heating plant was inaugurated in Dronninglund, Denmark, on 2 May this year. The photo shows Carsten Møller Nielsen, Board Chairman at Dronninglund Fjernvarme, welcoming Rasmus Helveg Petersen, Danish Minister for Climate, Energy and Building (to the left of the speaker). The system consists of 2,982 collectors with a total solar thermal capacity of 26 MWth (37,573 m²) and a 61,700 m³ seasonal pit heat storage and is planned to provide about 15,000 MWh per year. Its output will meet half of the annual heat demand of the plant’s 1,350 customers. According to the local district heating supplier Dronninglund Fjernvarme, the total investment costs for the plant amounted to DKK 106 million (EUR 14.6 million), of which EUR 6.1 million were invested in the solar installation (see the chart below). The plant was subsidised by the Danish Energy Technology Development and Demonstration Program, EUDP, which supported the project with Danish Krone (DKK) 21 million (EUR 2.953 Mio). The payback period is said to be 25 years. Solarthermalworld.org spoke with Søren Elisiussen, CEO at Arcon Solar, which delivered the collectors and the support structure for the solar field, about the plant’s technical specifications.
Photo: Arcon Solar
 

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