Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen

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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen ( modeling-low-temperature-rankine-cycle-small-scale-cogen )

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Sylvain Quoilin Appendix 1 : Other solutions for low grade heat recovery 4. The Ericsson Cycle : The Ericsson cycle is very similar to the Stirling cycle. It comprises 4 transformations : − 1­2 : Isothermal compression − 2­3 : Isobaric heating − 3­4 : Isothermal expansion − 4­1 : Isobaric cooling This cycle, like the Stirling cycle, uses a regenerator for the transformations 2­3 (isobaric cooling) and 4­1 (isobaric heating). The isothermal compression and expansion are achieved by permanently cooling (resp. heating) the compressor (resp. turbine). The efficiency of the ideal cycle is the Carnot efficiency but, like the Stirling cycle, it involves reversible heat transfers, which is not practically feasible. A particularly difficult issue is a proper heat transfer at the compressor and turbine level between the working fluid and the heat sources. Figure 68: Ericsson ideal cycle Figure 69: Working principle of the Ericsson Engine 123

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