|
6883 |
|
Tuesday, May 04, 2021, Hall 1 4:30 PM Heat Exchanger Products for HVAC&R |
|
Multifunctional heat exchangers for thermal energy storage |
|
Andreas Strehlow* / AKG Verwaltungsgesellschaft mbH, Germany André Große / FAHRENHEIT GmbH, Germany Ralph Herrmann/ FAHRENHEIT GmbH, Germany Birgo Nitsch/ AKG Verwaltungsgesellschaft mbH, Germany Ursula Wittstadt/ FAHRENHEIT GmbH, Germany |
|
HYBUILD: Innovative compact HYbrid storage systems for low energy BUILDings The HYBUILD project aims at developing cost-effective and environmental-friendly solutions, while ensuring comfort conditions in residential buildings located in two different climates: Mediterranean climate where cooling is critical; and Continental climate where a stronger focus is put on heating demand. A key to improve the energy efficiency of the system by maximising the use of renewable energy is the integration of hybrid energy storage components. Besides the use of electric storage and buffer tanks for domestic hot water the heating and cooling units (heat pumps) are combined with thermal storage through latent heat materials and adsorption cooling. One type of thermal storage is optimised by integrating a phase change material directly in the heat exchanger used to heat or cool water by condensation or evaporation of refrigerant. Such heat exchangers are part of AKG’s product portfolio for compressed air dryers since many years. Several new designs were developed, manufactured and tested to adapt the technology to the large storage capacities needed in buildings, while significantly reducing the footprint of the unit compared to conventional thermal storage solutions. The other type of thermal storage is an adsorption chiller. The compression chiller is boosted by cascading it with the adsorption chiller. Conventional adsorption heat exchangers are tube & fin heat exchangers either filled or coated with an adsorbent to adsorb or desorb water vapour at low pressure. Fahrenheit GmbH has developed a method to coat aluminium heat exchangers with zeolite type sorption materials that show a better performance for these climatic conditions. The in-situ crystallization of the sorbent material directly on the surface of the aluminium heat exchanger results in good heat transfer. |