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Turbo-compressors for R-718: Experimental evaluation of a two-stage steam compression cycle

Bantle, Michael; Schlemminger, Christian; Gabrielii, Cecilia H; Ahrens, Marcel Ulrich
Chapter
Accepted version
Åpne
Bantle (Låst)
Permanent lenke
http://hdl.handle.net/11250/2639327
Utgivelsesdato
2019
Metadata
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  • Institutt for energi og prosessteknikk [2622]
  • Publikasjoner fra CRIStin - NTNU [19694]
Sammendrag
Water (R-718) is a safe and energy-efficient refrigerant. Mechanical vapour recompression (MVR), an open-loop heat pump using R718, can significantly reduce the energy consumption for steam-heated processes like drying, pasteurization, evaporation or distillation. However, the existing compression technology is not cost-efficient, especially in the capacity range from 500 kW to 4 MW. Therefore, a novel two-stage turbo-compressor system, developed for application in industrial superheated steam drying and based on mass-produced automotive turbocharger technology, was developed. Its performance was evaluated in a test facility, showing that it is possible to compress superheated steam from atmospheric pressure up to 3 bar, delivering 300 kW at 133°C, with a COP of 5.9, an isentropic efficiency of 74% and a Carnot efficiency of 48%. With an estimated investment cost of 150 €/kW installed heating capacity, the system clearly has the potential of being a cost-effective solution for heat recovery in steam-heated industrial processes.
Utgiver
International Institute of Refrigeration

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