Design and modelling of a novel compact power cycle for low temperature heat sources

Jorrit Wronski, Morten Juel Skovrup, Brian Elmegaard, Harald Nes Rislå, Fredrik Haglind

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch

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    Power cycles for the efficient use of low temperature heat sources experience increasing attention. This paper describes an alternative cycle design that offers potential advantages in terms of heat source exploitation. A concept for a reciprocating expander is presented that performs both, work extraction and heat addition. Heated by thermal oil, evaporation takes place in two expansion chambers with a transfer of
    the working fluid at an intermediate pressure level. Using saturated liquid as feed leads to an expansion in the two-phase domain. A dynamic model of this expander is used to determine the state of the working fluid during the process. Based on this model, a first optimisation by means of changed valve timing is conducted and the results of this scenario are shown in this paper. The heat transfer during expansion is investigated and used to establish a representation of the dynamic calculation results for use with a steady state cycle evaluation. An organic Rankine cycle model is developed and used for a comparison. The performance of the expander itself and the different requirements regarding heat source and temperature levels are studied.
    Original languageEnglish
    Title of host publicationProceedings of ECOS 2012
    EditorsUmberto Desideri, Giampaolo Manfrida, Enrico Sciubba
    Number of pages15
    Publication date2012
    Publication statusPublished - 2012
    EventECOS 2012: 25th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Perugia, Italy
    Duration: 26 Jun 201229 Jun 2012


    ConferenceECOS 2012
    Internet address


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