Conventional district energy supply (DES) systems have relatively lower efficiencies when compared to polygeneration systems. The use of fossil fuels as a primary energy source in DES generates high levels of CO₂ emissions, degrading their environmental performance. On the other hand, renewable energy systems are generally integrated into the energy portfolio mix to improve the overall efficiency and sustainability, whilst curbing the overall greenhouse gas (GHG) emissions. In this study, an alternative renewable energy polygeneration system design based on biomass and solar energy is proposed. A thermodynamic analysis of the system was carried out, and the energetic and exergetic efficiencies were subsequently compared against the reference case. The results indicate that the alternative system only demonstrates slightly improved efficiencies over the reference system on the basis of cogeneration. However, when implemented for polygeneration, the alternative system offers a clear advantage with estimated energy and exergy efficiencies of 62.9% and 41.9%, respectively. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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天然气与可再生能源发电和海水淡化系统进行多联产的性能比较

与多联产系统相比，传统的区域能源供应（DES）系统的效率相对较低。在DES中使用化石燃料作为主要能源会产生大量的CO ₂排放，降低其环境绩效。另一方面，可再生能源系统通常集成到能源组合中，以提高整体效率和可持续性，同时减少整体温室气体（GHG）排放。在这项研究中，提出了一种基于生物质和太阳能的替代性可再生能源多联产系统设计。对该系统进行了热力学分析，随后将能量效率和能量效率与参考案例进行了比较。结果表明，在热电联产的基础上，替代系统仅显示出比参考系统略有提高的效率。但是，当用于多联产时，替代系统具有明显的优势，估计的能量和火用效率分别为62.9％和41.9％，分别。©2020年化学工业协会和John Wiley＆Sons，Ltd.