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Carbon dioxide as a refrigerant in a sludge drying heat pump.

Author(s) : FLAGA A., SCHNOTALE J.

Summary

A carbon dioxide (CO2) heat pump system for sewage sludge drying can be an energy efficient alternative to the traditional methods, that also avoids emissions from the drying installation. In this system, sludge is dried by closed-loop circulating air, treated in the heat pump. Due to the critical parameters of CO2, the process in the CO2 heat pump is the transcritical cycle with a high compressor discharge temperature. It provides additional hygienization of dried product which becomes sanitary safe and environmentally sound. The paper presents data from laboratory measurements of sludge drying in controlled temperature and humidity environment and energetic evaluation and optimization of the working parameters of the transcritical CO2 heat pump. Impact of the internal heat exchanger and gas cooler pressure on energy efficiency of the heat pump and the whole drying system have also been analysed.

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Pages: ICR07-E2-210

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Details

  • Original title: Carbon dioxide as a refrigerant in a sludge drying heat pump.
  • Record ID : 2007-2803
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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