Sustainable lake-cooling

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GRØN DYST 2014 Technical University of Denmark

Sustainable lake-cooling
Paper
Author:C. Rossing (DTU Mechanical Engineering, Technical University of Denmark, Denmark)
D. Bond (DTU Mechanical Engineering, Technical University of Denmark, Denmark)
N. Funk (DTU Mechanical Engineering, Technical University of Denmark, Denmark)
M. Bahrenscheer (DTU Mechanical Engineering, Technical University of Denmark, Denmark)
Date: 2014-06-27     Track: Main     Session: 1

This project was developed in the course ‘Thermodynamic modeling’ with Brian Elmegaard as our supervisor and the basic idea is to use the difference in temperature from the underground or in this case, a lake, and the surroundings above, to cool a container and its contents. The concept was developed with use at the Roskilde Festival in mind, since there is a large, deep lake, which is a relic of the area's time as a gravel pit. A limited part of the lake serves as bathing lake and with 20,000 daily bathers a huge success. However, we believe that the lake has even more potential. The cooling of canned beer is done today, by large refrigerated containers connected to the grid; the single most energy-consuming activity at the Roskilde Festival. This can be done smarter - with a solution that uses the festival environment, for a more energy-efficient cooling, based on the cold water from the lake’s bottom.