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Middelburg public building De Helm heated by invisible solar tubes

Goal

Harvest thermal solar energy without affecting the esthetical appearance in a historical city.

 

Description

Innovative sustainability is being made in the heart of the historic center of Middelburg. The Q-roof system is being used with the help of the European subsidy project Solarise. We do this on the roof of an outbuilding of the monumental city hall of Middelburg. Under the slate roof covering of the building at De Helm in Middelburg, where the Volksterrenwacht Middelburg is located, water is heated by the sun.

A thermal systems has to be placed under the roof tiles. The slates are pressed on a metal sheet, that transfers the heat of the sun to a tubing system that is connected to a heating system .

The tubes who are connected on the battens under the roof tiles (slates in this case) contain an anti freeze liquid. The sun heats the slates, that heats the liquid, that heats the water in a boiler inside the building. A small electric pump ensures that the water circulates.

Key figures

Location: Middelburg (NL)

Size: maximum thermal power 3400 kW (170 Watt per m2)

Energy production per year: 2780 kWh (= 10GJ/year)

Owner: The municipality of Middelburg

Energy use: domestic hot water

Technology: Q-roof – invisible sunheat/energy

Current status

The tubes are in place since june 2020 and the boiler is almost placed in the building. After that,the tubes must be connected to the boiler and the drain. Then finaly the control technology must be installed.

 

Attention points / lessons learned

 

 

Technical schema