Core objective

The core objective of the SWS-HEATING project is to develop a new sorbent material of the SWS family with optimised sorption properties, matching the working conditions of a heat storage cycle with low temperature solar heat charging (70 – 95 °C) to allow efficient application also in less sunny north European countries.

Overall objective

The overall objective of the proposed SWS-heating system is to overcome drawbacks current solar- active house concepts suffer from. The overall result is a reduced energy consumption in the residential and commercial buildings sector, while at the same time enhancing the thermal comfort of the users.

Specific Objectives

  • Develop a new sorbent material of SWS-family with a high heat storage density (1.1-1.3 GJ/m3)and high stability under relevant boundary condi- tions (1,000 cycles), at low cost (potential to reach a cost below 5 €/kg at mass production). The heat storage density will by over 30% compared to the current best-performing SWS-material, and by 40- 60% compared to state of the art sorbent materials for low temperature charging range up to 95 °C.

  • Develop a compact multi-modular SWS-STES con- figuration with high corrosion resistance, high dura- bility, ease of installation & maintenance and low total cost of ownership (TCO). Focus will be on the central switching unit with the new vacuum valves. The aim is to reduce the module size by at least 50% and its cost by 30% compared to the state of the art.

  • Optimise the design & compactness of the plate heat exchanger (HEX) for the adsorber of the SWS- STES configuration, leading to high specific heating power (~ 90 kW/m3), reduced size, and proven reliability, in terms of corrosion resistance.

  • Develop dedicated plate HEXs for the evaporator and condenser of the multi-modular SWS-STES configuration, reducing their size & cost up to 20%.

  • Develop low cost all-glass vacuum tubes for high-efficiency solar collectors for the low temperature
    range (70 – 95 °C). The final aim is to reduce the cost by 40% compared to state of the art.

  • Optimise the design of a compact vacuum combi-storage tank that minimises thermal losses, reaching more than 5 times lower than well-insulated hot water tanks.

  • Develop smart, adaptive and predictive control based on Digital Data Control (DDC) techniques to effec- tively manage the operations of the system parts, contribute to the solar fraction increase by up to 10%, and ensure thermal user comfort. Integrate advanced and user-friendly features, for enhancing user acceptance.

  • Realise & test the SWS-heating system using a containerised building prototype at two climatic zones (Germany/Sweden) to validate at intended environment the potential to reach a solar fraction of over 60%.

  • Develop a technology roadmap, to define the next steps of innovation/demonstration actions, and explore the possible uses of the novel material & configuration, and the advanced components & control.

  • Roll-out a comprehensive communication, dissemination and exploitation plan, sharing the project insights and results with various stakeholders through conferences, surveys, workshops, etc., with the overall aim to tailor strategies for societal awareness and engagement for both genders.