A novel approach for the thermodynamic modelling of two-phase power cycles

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-02-24 DOI:10.1016/j.tsep.2025.103415

Christopher R. Belfiore, Truong H. Phung, Linh Nguyen, Ibrahim A. Sultan

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Abstract

When modelling thermodynamic power cycles, it is typical to determine state properties through the use of an equation of state to evaluate parameters of interest. This results in a black-box-like model of the cycle with heavy reliance upon equations of state, leading to compromises in algorithm speed and stability. This paper presents a new approach for cycles within which expansion is contained within the two-phase region (which can include the trilateral flash cycle and partial evaporation organic Rankine cycle), based upon fundamental thermodynamic relations. Thermodynamic properties need only be determined for saturated and liquid states, which along with system constants and independent variables, allows for the rapid evaluation of important cycle parameters. In this paper, a definition is provided for a two-phase power cycle, governing equations are presented, and the thermodynamic derivation of the model is provided. The different types of working fluid are discussed with respect to the considerations which must be made for each. Lastly, a comparison between three simple algorithms (proposed model, hybrid model, and conventional model) is presented to demonstrate the validity of the proposed model and the improvements possible over the conventional method. Results show that the algorithm running the proposed model shows substantial improvements when compared to the conventional approach, demonstrating an improvement in runtime by a factor of 44.77, a reduction in cyclomatic complexity of 72.73%, and a reduction in reliance upon equations of state of 99.72%, with no compromises in accuracy.

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.