Research on using carbon dioxide in supermarket refrigeration has been done in Energy Technology Department at KTH for more than 10 years. The studies has been financed by Swedish Energy Agency to find sustainable refrigeration solutions for supermarkets. The current research is within the Effsys+ program, as a continuation for previous research programs "Alternativa Köldmedier", "Klimat 21", "eff-sys" and "Effsys2".
A comprehensive evaluation of refrigeration and heating systems in supermarkets based on field measurements and modelling
This project investigates the performance of new vapour compression system solutions for heating and refrigerating needs in supermarkets. Focus will be on CO2 trans-critical and cascade solutions, the available solutions in the market will be investigated, suggestions for system modifications and optimization will be made, and new system solutions will be suggested.
The investigations in this project will be done on several levels; it will include general analysis of the vapour compression systems for heating and cooling needs and will investigate the performance of main system components. It will also include evaluation of the heating and cooling demands in supermarkets by surveying field installations and by performing calculations for representative cases.
This project will use the data bank created in earlier supermarket field test projects to perform more detailed analysis focusing on components performance, parasites energy consumption, and understand systems control. The project will also provide guidelines on how to instrument refrigeration systems and to explain the different analysis methods. Simple indicators of performance will be also provided.
In cooperation with the involved companies which include major manufacturers, suppliers and consumers in the field, a “state of the art” supermarket refrigeration system with heat recovery will be built. The researchers in this project will be involved at the early stages of system design; the system will be properly instrumented, analyzed and compared to the rest of the systems included in earlier stages of the study.