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Evaluation of the performance of an absorption-demixtion heat pump for upgrading thermal waste.

Author(s) : NIANG M., CACHOT T., LE GOFF P.

Type of article: Article

Summary

The absorption/demixtion heat pump uses a partially miscible mixture as working fluid instead of a binary miscible mixture. Under low pressure the mixture is a heterogeneous solution of two non-miscible phases in thermodynamic equilibrium but at very different compositions. The solution then splits into two liquid phases without any energy supply. Beyond a critical pressure the two phases become miscible. At high temperature, the more volatile phase is evaporated and its vapour absorbed in the less volatile phase. The authors calculated the system's performance and compared its values against those of the absorption heat pump and the compression heat pump: the COP is respectively 2 and 100 times greater because the separation does not need costly energy. Moreover, the system offers investment cost savings because the separator is a simple decanter.

Details

  • Original title: Evaluation of the performance of an absorption-demixtion heat pump for upgrading thermal waste.
  • Record ID : 1999-1902
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 18 - n. 12
  • Publication date: 1998/12

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