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This study concerns the development of fluids and industrial high temperature heat pumps using non azeotropic mixtures. Three mixtures (chlorofluore hydrocarbon/chlorofluore hydrocarbon, chlorofluore hydrocarbon/paraffin hydrocarbon and water/alcohol) were selected and characterised. A prototype 10-50 kW heat pump was built. The poor reliability of the compressor limited the experimental work to thermal characterisations at low temperature. An analysis has been made of dry compressors adapted to a chlorofluore hydrocarbon/chlorofluore hydrocarbon mixture, in particular of the thermal power of heat pumps with standard centrifuge compressors and on the air tightness of such dry compressors. An economic study shows that the relative gain on the pay-back time given by a non azeotropic mixture by comparison with a pure fluid is a function of the temperature difference through which the process streams are to be heated or cooled.

Additional information

Authors: ROUSSEAU G, Société Nationale Elf Aquitaine, Saint Symphorien d'Ozon (FR)
Bibliographic Reference: EUR 12860 FR (1990) 108 pp., MF, ECU 8, blow-up copy ECU 13.75
Availability: (2)
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