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Thermodynamic pre-determination of power generation potential in geothermal low-temperature applications
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0001-7732-6971
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2014 (English)In: Geothermal Energy, Vol. 2, no 4, 1-10 p.Article in journal (Refereed) Published
Abstract [en]

Background: Small capacity, low temperature, geothermal heat sources providesignificant opportunities for distributed, small scale power generation. Projectdefinitions and pre-dimensioning however require advanced thermodynamicengineering at a cost independent of project size. In order to reduce this cost, anew method has been developed to allow basic level engineers to performpre-optimisation of thermodynamic potential as well as expected performance usingavailable power plant technology at such pre-optimized conditions.Results: By reducing the complexity of second-law computations, a simpletwo-dimensional diagram is shown representing the dimensioning criteria requiredfor maximum power generation using the particular heat source and sink whileconsidering expected power plant performance, using systems and componentson the market.Methods: By sensitivity analysis the combination of thermodynamic analysis and realworld data correlations was simplified and arranged for pre-dimensioning ofbusiness cases.Conclusions: Optimal pre-dimensioning of power generation system for anygeothermal heat source, with a defined heat sink, can be determined withoutadvanced thermodynamic expertise. This reduces the cost for business case proposals,pre-dimensioning and tender specifications of small-scale power generation systemsfor low temperature heat sources. The intended implication of this work is to increasethe use of low-temperature geothermal wells for distributed power generation.

Place, publisher, year, edition, pages
Springer, 2014. Vol. 2, no 4, 1-10 p.
Keyword [en]
ORC; Kalina; Waste heat; Power cycle; Geothermal; Performance;
National Category
Energy Engineering
Research subject
Energy Technology
URN: urn:nbn:se:kth:diva-188003DOI: 10.1186/s40517-014-0004-2ScopusID: 2-s2.0-84942116253OAI: diva2:932997

QC 20160603

Available from: 2016-06-02 Created: 2016-06-02 Last updated: 2016-06-03Bibliographically approved

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