Special products by ratiotherm for specific projects
Six million litre tanks
Within the context of a pre-planning study, a concept for a solar-powered local heating system with a seasonal heat storage facility has been developed for the Bavarian capital of Munich. The area to be supplied is a part of the new housing estate planned for "am Ackermannbogen" near to the Olympia Park. Mainly multi-storey residential buildings have been planned for the selected utility area with a gross area of 26,600 m2; these are to be built as low energy designs.
The total heat requirement for heating, the domestic hot water supply and distribution losses in the 2 conductor local heating network has been calculated at just under 2,000 MWh/a. The solar-powered local heating system has been designed to enable 50% of this amount of heat to be covered by solar power accumulated by thermal collectors.
The collectors installed on the roofs of the buildings make up a total area of approx. 2,700 m2; in the summer these charge the seasonal storage facility and then supply the buildings with solar heat right into the interseasonal periods. For the necessary back-up system, the local conditions require an efficient way of combining solar power and district heating. In the planned concept, district heating will be used to power an absorption heat pump. The heat pump is in constant operation from November to the middle of March pumping low temperature heat from the central area of the large-scale storage tank for use up to a temperature level of 60 °C to 70 °C; this means that the storage tank is able to store usable heat throughout the year and that a buffer is available to cover peak output periods. At the same time, the lower section of the storage tank is cooled to approx. 15 °C.
Press release "Sun, Wind and Heat here
Van der hoeven project
The company, van der Hoeven greenhoesebuilders bv, plan and crreate industrial greenhouse complexes with floor areas of 10000 to 40000 m².
The energy supply for heating these buildings is provided by gas condensing boilers. Furthermore, a part of the exhaust fumes emitted in the combustion process are fed into the greenhouses to improve the CO2 level
To bridge idle periods and take up excess heat during operation in the summer (CO2-led operation), heat storage facilities with a capacity of
approx. 300 to 4000 m³ water are planned. These thermal large-scale storage tanks are equipped with thermal-hydraulic charging and discharging devices which serve the purpose of increasing the efficacy of the boiler due to greater use of the heat output.
Crailsheim public utilities
Solar local heat supply for the Hirtenwiesen II housing estate
Crailsheim public utilities are planning the construction of a vertical buffer storage facility holding 100 m³ water. The project is being sponsored within the framework of the Federal research project, "Solar Heat 2000 Plus".
The storage facility has an internal diameter of 3200 mm, a total height of 12000 mm and the prototype is being constructed with finished, prestressed concrete parts. It will act as the "leading storage facility" for a large solar heat and district heating network. In the second construction phase, it will be extended by a seasonal water storage tank. An integrated thermal-hydraulic layer insert for a flow rate of 40 m³/h has been installed to enable a more efficient transfer of solar heat. (diameter 800 m; height 12000 mm). The storage tank has been completely lined with stainless steel and equipped with measuring technology from Stuttgart University (ITW). The ITW has been assigned the operational test measurement of the system.