Layers - buffer storage without heat exchanger

Layered buffer storage PLC

Application areas

The SPS stratified buffer storage tank is designed for use in heating, solid fuel and solar thermal systems, as well as in combined heat and power plants. It ensures efficient temperature stratification and provides usable energy as needed from different heat sources.

Thanks to the optimized feed-in and return flow, the storage tank is suitable for individual systems as well as for connecting several buffer storage tanks in series, for example in larger building concepts or combined energy supplies.

material & construction

The tank is made of high-quality steel S235JRG2 according to DIN 4753 and Euronorm EN 12897. The inside of the container is left raw, the outside is factory primed and stands on a stable base ring.

To improve stratification, stratification channels and a welded-in stratification separator plate are integrated. The sockets are arranged at a 90° angle, which simplifies assembly and the connection of multiple storage tanks.

Technical features

The storage tank is designed for a maximum operating pressure of 5 bar and features two sockets for electric heating elements. Additional connections are positioned to optimize return flow and maintain temperature stratification.

The design reduces thermal mixing, thus enabling high utilization of the stored heat across different temperature zones.

Insulation options

Several insulation options are available for the SPS buffer tank: 100 mm STS EPS (efficiency class C), 130 mm STS EPS AirPor® (efficiency class B), or 150 mm PU super rigid foam (efficiency class A) for tank sizes from 600 to 1000 liters. All insulations are supplied with a silver-gray plastic jacket and a sealing strip.

The insulation is precisely fitted and removable to facilitate installation and maintenance. Depending on the design, this can significantly reduce heat loss.

EPS AirPor® gray polystyrene foam

EPS AirPor® insulation combines polystyrene foam with added graphite, resulting in improved heat reflection and reduced heat loss. The 130 mm version (110 mm EPS + 20 mm fleece) meets energy efficiency class B, while the 100 mm version (80 mm EPS + 20 mm fleece) meets energy efficiency class C.

Advantages include up to 30% reduced heat loss compared to conventional insulation materials, easy and quick installation, 100% recyclability, and additional floor and lid insulation. The thermal conductivity according to DIN EN 12667 is 0.0316 W/mK; fire protection class according to DIN 4102: B2.

PU super-rigid foam insulation

The PU super rigid foam insulation, with a thickness of 150 mm, offers excellent insulation properties and achieves energy efficiency class A. It consists of 150 mm polyurethane combined with 10 mm polyester fiber fleece and is covered with a PS jacket in RAL 9006.

The fleece lamination minimizes convection losses at the container walls, lid, and joints. The insulation is removable, skin-friendly, environmentally friendly, and also 100% recyclable. Thermal conductivity according to DIN EN 12667: 0.023 W/mK; fire protection class according to DIN 4102: B2.

Assembly & installation

The pre-assembled 90° angled sockets allow for easy and secure connection to heating circuits and convenient connection of multiple storage tanks to battery packs. The stand ring design simplifies on-site installation.

Thanks to removable insulation and precisely fitting locking strips, installation is quick and maintenance-friendly.Two sockets for electric heating cartridges allow the use of additional electric reheating if required.

Advantages & Operation

The SPS stratified buffer tank combines robust steel quality with sophisticated stratification technology and various insulation options, allowing it to be optimized for different requirements. Reduced heat loss, improved stratification, and flexible connection options increase efficiency and operational reliability.

Overall, the storage system offers a durable, economical solution for energy storage in modern heat supply systems and facilitates the integration of renewable heat sources as well as the optimization of consumption and operating costs.

Scope of delivery

• Stratified storage tanks without heat exchangers of your choice
• including selected insulation
• Assembly & Operating instructions