Share

IIR document

High-temperature CO2 heat pump integration for milk powder spray drying.

Number: 1205

Author(s) : KONG L., WALMSLEY T. G., CARSON J. K., KLÖPPEL S., SCHLOSSER F., CLELAND D. J.

Summary

In the spray drying process, air is heated from approximately 15 to 200 °C, which currently cannot be achieved with commercially available heat pump systems. While the maximum sink temperatures that can be achieved by high-temperature heat pumps are continuing to increase, the COPs are still limited – particularly for heat pumps that use natural refrigerants. The study provides a comparison between different integration strategies for a high-temperature CO2 heat pump and represents either the full electrification (heat pump only) or partial electrification (combined with biomass boiler) of the spray drying process with the objective to lower the operating cost. At the current prices of electricity (~40 NZD/GJ) and biomass (13 NZD/GJ – 21 NZD/GJ excluding transport costs), the high-temperature heat pump was found to be operationally cost competitive with the biomass boiler. Partial electrification to 120 °C and 150 °C showed similar costs overall, with 120 °C being more advantageous at times of high electricity price (70 NZD/GJ) and 150 °C being more advantageous at times of low electricity price (40 NZD/GJ). The electrical grid emissions factor was the most significant factor that affected the emissions of the different solutions.

Available documents

Format PDF

Pages: 12 p.

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: High-temperature CO2 heat pump integration for milk powder spray drying.
  • Record ID : 30032718
  • Languages: English
  • Source: 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Publication date: 2024/08
  • DOI: http://dx.doi.org/10.18462/iir.gl2024.1205

Links


See other articles from the proceedings (135)
See the conference proceedings

Indexing