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  • Neutrons for Heat Storage, NHS, (completed)

    The Neutrons for Heat Storage (NHS) project aims to develop a thermochemical heat storage system for low-temperature heat storage (40-80 °C). Thermochemical heat storage is one effective type of thermal energy storage technique, which allows significant TES capacities per weight of materials used. In the NHS project, reversible chemical reactions (absorption and desorption) between metal halides and ammonia (NH3) are used. The project is a Nordic collaboration between Technical University of Denmark (DTU) - Denmark, Institute for Energy Technology (IFE) - Norway; Amminex Emission Technology (AET) - Denmark and KTH- Sweden. DTU, IFE and AET are working on materials development and characterizing for this types of reaction systems. Their research therefore include developing novel metal halides, their thermos-physical property characterization as well as improving these characteristics by e.g. producing composites by combining with materials having better thermal conductivity. Based on the inputs from these materials’ research, the KTH partners are designing a bench-scale TCS system employing one chosen metal halide candidate, for the reversible absorption/desorption with NH3.

  • Combined Heat and Power plants in combination with borehole thermal energy storage (completed)

    Many combined heat and power plants in Sweden waste large amounts of heat summer time due to low heat demand and permanent generation of electricity. This project will provide design and decision making tools for including seasonal thermal storages in the ground so that summer time waste heat can be use during the winter.

  • Integrating Latent Heat Storage into Residential Heating Systems

    This project experimentally and numerically investigated the performance of thermal energy storage (TES) tank with phase change material (PCM). The experimental analysis has been conducted on a test rig that is designed and built within this project at the Energy Technology Department at KTH. The test rig’s experimental capacity covers wide range of heating and cooling/refrigeration applications; it can run in the temperature range of - 10 to 90°C with a heating capacity of about 20kW and cooling capacity of about 10 kW. The test rig is fully equipped with highly accurate measurements that facilitate detailed analysis of the PCM-TES tank performance.

  • Novel tool and guidelines for designing ground source heat pumps (GSHPs) in densely populated areas

    Ground source heat pumps (GSHPs) are a widespread technology in Sweden and its spread is forecasted to increase even further. However, designers of such systems lack a dedicated design tool when dealing with independent GSHPs, like in densely populated areas. This results in systems operating with lower efficiency than expected.

  • Novel tool and guidelines for designing ground source heat pumps (GSHPs) in densely populated areas

    Ground source heat pumps (GSHPs) are a widespread technology in Sweden and its spread is forecasted to increase even further. However, designers of such systems lack a dedicated design tool when dealing with independent GSHPs, like in densely populated areas. This results in systems operating with lower efficiency than expected.

  • Deep Borehole Heat Exchanger (completed)

  • Long-term performance measurement of GSHP systems serving commercial, institutional and multi-family buildings

    Measured long-term performance data for ground source heat pump systems serving commercial, institutional and multi-family buildings are rarely reported in the literature. Energy use intensity figures are occasionally published, but as they necessarily lump the building loads and the system performance together, they are of limited usefulness in understanding real-world system performance. Annex 52 will bridge the gap between those who see the heat pump system as a complex environment and the ground source as a black box, and those who see the ground source as a complex environment and the heat pump system as a black box.

  • HYSTORE - Hybrid services from advanced thermal energy storage systems

  • Distributed Cold Storages in District Cooling

    The project “Distributed Cold Storages in District Cooling” is a work package (WP 2.3) in the program “Thermal energy storage- the solution for a flexible energy system” coordinated by Energiforsk.