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IIR document

Performance simulation of a heat pump drying system using r744 as refrigerant.

Number: pap. 1037

Author(s) : BANTLE M., KVALSVIK K. H., TOLSTOREBROV I.

Summary

Drying is an energy intensive thermal process. The specific energy consumption in industrial systems is normally higher than 0.8 kWh/kg of evaporated water and the thermal energy demand in most drying systems is provided through burning of fossil fuels. The potential of using R744 (CO2) as working media in a heat pump drier was investigated for a drying process at 45°C, 60°C and 70°C. The trans-critical temperature glide of CO2 reduces the large temperature differences during re-heating of the drying air. The obtained Coefficients of Performance were between 3.4 and 4.3 resulting in specific energy consumption in the range of 0.24 to 0.27 kWh/kg of evaporated water for the different drying processes. The simulations confirm that heat pump assisted drying has the potential to reduce the energy demand by around 70% in general and shows the feasibility of applying heat pump drying also at drying conditions up to 70°C.

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Pages: 8 p.

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Details

  • Original title: Performance simulation of a heat pump drying system using r744 as refrigerant.
  • Record ID : 30019096
  • Languages: English
  • Source: 12th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2016). Proceedings. Édimbourg, United Kingdom, August 21st-24th 2016.
  • Publication date: 2016/08/21
  • DOI: http://dx.doi.org/10.18462/iir.gl.2016.1037

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