News on CSHPs

July 22, 2014

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Online map of solar energy ressources

July 22, 2014

solarmapYou can find an online resource on solar energy systems and you may even add your system to the map…


New record size Central Solar Heating plant in Vojens, Denmark

June 5, 2014
Vojens district heating company has agreed in installing the world’s largest solar thermal plant with 52,491 m2 solar collectors from Danish ARCON Solar.
Hereby Dronninglund with a collector area of 37,275 m2 will be set second.
You can follow the plant extension on the district heating home page (in Danish) at

2nd International Solar District Heating Conference

February 14, 2014

2nd International Solar District Heating Conference

3-4 June 2014, Hamburg

Call for abstracts – 3 days left to submit your abstract – Deadline 14.02.2014

The 2014 edition of the solar district heating conference invites market actors and experts to gather in Hamburg on 3-4 June to exchange experience and network at international level. Don’t miss the opportunity to present your interesting activities, submit your abstract!

Key topics of the conference sessions are:

Topic 1: Technical system integration of solar thermal into district heating
Topic 2: Smart district heating systems including solar thermal
Topic 3: Solar district heating for housing areas and villages
Topic 4: Policy, market strategies and business models
Topic 5: New products, technologies and services

To submit your abstract, please send it as a word document of 1-2 pages to before 14.02.2014.

Your abstract will be evaluated by our scientific committee and you will be notified on 21.03.2014.

Looking forward to your contributions!

Your SDH Conference 2014 Organizing Team

More information:


100% renewable district heating for smart cities – New Sunstore 4 website launched

December 21, 2013

The Sunstore 4 plant, located in Marstal Denmark, provides citizens with 100% renewable district heating from solar thermal, biomass and heat pump. The new project website includes technical details of the system and pictures, as well as information about its real development on the ground.

Source: Newsletter by SDH.

SDH Online-Calculator available

December 21, 2013

A tool has been developed for dimensioning and forecast of performance and economics of solar district heating systems. The SDH Online-Calculator is now available at

Source: Newsletter by SDH.

1th Solar District Heating Conference SDH, Malmø, April 2013

April 10, 2013

The conference presentations will be visible on in a few days.

The conference clearly showed that there are improvements during the last years on every part of the solar district heating systems. This includes especially reduction of the district heating temperatures, simplification of the overall systems, improved efficiency of solar collectors, reduction of price for solar collectors and especially large-scale storage systems. It is probably at the time to make an update of my old paper on 15 years going now to “25 years of experiences in large-scale solar heating”.

The Danish systems seem to be still leading and partly driving the developments. The presenter from the Danish District Heating Association, Birger Lauersen, did give his version, why this is the case. Basically it is due to the fact that district heating exist, that cooperative organisation of DH systems with for-non-profit economic model are the most important preconditions. High gas prices and low interest rates support, however also. I may add the first movers on the buyers, on the producers and the consultancy sides. However the findings from Denmark may not be valid in cities, which is also the case for Copenhagen, where solar must be produced on rooftops or in the outskirts. In Copenhagen this is certainly realistic due to the DH piping to a very large region around Copenhagen covering approx. 50 km diameter the resent years. There is enough space for solar between the cities. It will be interesting to see, if this happens. In the first term of energy transformation, bio energy seems to be the first choice. In the longer run, the demand for biomass for transport will probably set an end to this direction.

Example systems and projects where presented from all over Europe. Sweden seems to have stopped the developments, where Germany has its “Energiewende” that is driving developments. The southern countries are suffering from the economic crisis, even though the potentials are available.

An online tool for large scale solar heating with/without large storage by Solites, based on thousands of TRNSYS computations, was presented. The thousands of values from the computations are placed into a database and represented by multidimensional fit into approximations for lookup by the online tool – Hence no computations are “online” leading to fast results, but in the same time limits the number of combination of parameter, locations and system configurations. The tool is applicable for distributed and central systems. You find it at

IP-Solar is an online monitoring system for distance control and monitoring of central solar systems with minimum sensors and configurations to keep costs down. Due to its web-appearance, the possibility of applying modern devices such as smart phones, tables etc. are at hand. The solution does provide failure diagnostics by approx. 160 predefined algorithms to ease surveillance of plants. Notification is supported. As an example, the overheating of the solar collectors would be notified as warning in a first temperature-range, advancing to a critical condition notification as the temperature rises. I feel that such tools will help the solar heating sector to spread. Supporting this cheap and simple support with a full-scale distance monitoring and support consultancy would give a full coverage of such services to new operators and hereby probably lead to further expansion.

Most important are the talks in the break giving insight into the actual projects, findings and issues at the different plants and by the different stakeholders. The new Marstal extension is one of the most important steps showing that the limit of size is not reached yet. The pit did again show price reduction due to size, now being approx. half of the price from the previous pit. It also shows new challenges with the new pit storage has a serious attach of corrosion on the inlet and outlet pipes, probably due to biological material that was carried into the pit under construction. This is new due to size and long construction period with an open pit. The answer is not found yet and the condition is very critical, a solution must be found to avoid similar situations.

Next solar district heating conference will take place in Germany in May 2014.


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