Theoretical study of an auto-cascade high-temperature heat pump using vapor injection and parallel compression techniques for steam generation

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-03-05 DOI:10.1016/j.tsep.2025.103482

Chunyu Feng, Cong Guo, Junbin Chen, Sicong Tan, Yuyan Jiang

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引用次数: 0

Abstract

Utilizing high-temperature heat pump (HTHP) technology to recycle waste heat for steam generation is energy-efficient and environmentally friendly. To enhance the thermodynamic performance of steam generation, vapor injection, and parallel compression techniques were incorporated into an auto-cascade HTHP system. Additionally, dual-stage condensation enabled the simultaneous production of two sets of steam at different temperature levels. Through Python-based models, a comparison of various low-GWP zeotropic mixtures was conducted. The improved auto-cascade cycle exhibited a COP increase of 18.17%-37.4% compared to the basic cycle and 6.3%-21.2% compared to the basic auto-cascade cycle. The two-stage condensation technology enhanced the temperature-matching capabilities of the condensers. Among the zeotropic mixtures, R1234ze(E)&R1336mzz(Z) exhibited the highest thermodynamic effectiveness. The heat transfer degradation of zeotropic mixtures led to a more than 15% increase in the condenser heat transfer area compared to pure refrigerants. Parametric analysis indicated that adjusting key design parameters, such as evaporator outlet superheat and cascade heat exchanger outlet pinch temperature difference, can achieve economical operation while maintaining optimal thermodynamic performance.

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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.