Time: 12:00 to 12:45 (CET)
Venue: via Zoom
Highly efficient high-temperature heat pumps with temperature glide by Dennis Roskosch (ETHZ) and Leon Brendel (OST)
Dennis Roskosch and Leon Brendel will introduce the research project “High-efficiency high-temperature heat pumps with temperature glide” and present the first results. The research project is a Bridge Discovery project funded by the SNF and Innosuisse. It is a joint project of ETH Zurich (André Bardow) and the Eastern Swiss University of Applied Science (Stefan Bertsch).
The project aims to overcome the challenges of industrial heat pumps by introducing a holistic design approach for refrigerants and process designs with temperature glide, e.g., realized by refrigerant mixtures. Heat pumps with temperature glide can optimally meet the specific requirements of industrial applications, significantly increasing efficiencies. As a further benefit, the use of refrigerants with temperature glide enables higher temperatures with standard heat pump components enlarging their field of application without increasing cost. However, the current knowledge gap in the refrigerant selection and handling in practice is still too large to trigger industrial research and development.
This project combines the modeling and experimental elements needed to bridge the gap towards the faster market introduction of high-efficiency industrial heat pumps with temperature glide. Refrigerants will be optimized for typical industrial applications by an integrated refrigerant and process design framework. An experimental test rig was developed and up to 16% COP improvements of glides were experimentally demonstrated. Mixtures were also found to generally maintain a COP higher as operating conditions changed. Several initial concerns regarding the handling of high glide refrigerant mixtures were not encountered during the experimental campaign. These findings revealed by several hundred datapoints will be presented and discussed.
