Thermodynamic method to convert heat of a lower temperature range to a higher temperature range

摘要

1. A thermodynamic process for converting heat of a low temperature level to a higher temperature level, wherein a medium consisting of a mixture of at least two components is conducted in a closed cycle, the medium, on at least one point of the cycle is evaporated by heat removal from a heat source of lower temperature, is compressed, on at least one other point of the cycle, is condensed to a heat sink of a higher temperature by heat transfer and is again released, and wherein, as the recirculated medium, a mixture is used that behaves azeotropic either under the lower pressure during evaporation or under the higher pressure during condensation, characterised in that either the quantitative ratio of the components contained in the mixture or the pressure of the recirculated medium is adjusted such that the mixture either at a first pressure and at a temperature being slightly below a heat source of constant temperature boils constantly and is condensed at a second pressure differing from the first pressure within a decreasing temperature range, the temperature difference between the heat sink and the condensed medium being kept substantially constant during the heat transfer, or is constantly condensed at a first pressure and at a temperature being slightly above a heat sink of constant temperature and is evaporated at a second pressure differing from the first pressure within an increasing temperature range, the temperature difference between the heat source and the evaporating medium being kept substantially constant during the heat transfer.