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Design and thermoeconomic analysis of a solar parabolic trough – ORC – Biomass cooling plant for a commercial center
Solar Energy ( IF 6.7 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.solener.2020.11.080
Eduardo A. Pina , Miguel A. Lozano , Luis M. Serra , Adrian Hernández , Ana Lázaro

Hybrid renewable polygeneration systems are regarded as key solutions for the sustainable energy supply of buildings. While solar heating and cooling comprises a wide range of technologies, there has been limited research on the combined production of power and cooling only, with little or no heat demand. This study designs and analyzes a hybrid solar–biomass ORC-based polygeneration system from energy, economic, and environmental viewpoints. The polygeneration system is designed to cover the electricity and cooling demands of a commercial center located in Zaragoza, Spain. A parabolic trough collector field coupled with thermal energy storage, and an auxiliary biomass boiler supply heat to an Organic Rankine Cycle (ORC), which generates electricity to cover electrical demands and to produce cooling in mechanical chillers. The biomass boiler supports the solar thermal production to ensure a stable and reliable heat supply to the ORC. The system is connected to the electric grid, so that electricity purchases and sales are possible. The equipment sizing is performed with the goal of achieving a high renewable fraction in the total electricity consumed by the commercial center. The analysis of the proposed plant includes the hourly operation throughout the year, complemented by an economic assessment, considering investment and operation costs, and an estimate of the environmental benefits of the plant. Also, a thermoeconomic analysis is developed to determine the cost formation process of the internal flows and final products of the plant. The unit cost of each flow is broken down into investment and operation cost components. Sensitivity analyses of the investment cost, interest rate, biomass price, and electricity selling price discount are made. The results show that, in economic terms, the system is not presently viable, since the cost of the electricity produced (279.07 €/MWh) is much higher than the electricity purchase price (126.70 €/MWh). In environmental terms, the system is capable of displacing 96.1% of the CO2 emissions and 85.6% of non-renewable primary energy consumption relative to a conventional system consuming grid electricity only.



中文翻译:

太阳能抛物线槽– ORC –商业中心生物质冷却装置的设计和热经济学分析

混合可再生多联产系统被视为建筑物可持续能源供应的关键解决方案。尽管太阳能采暖和制冷包含广泛的技术,但仅对电力和制冷的联合生产进行的研究很少,而对热量的需求很少或没有。这项研究从能源,经济和环境的角度设计并分析了基于太阳能-生物质ORC的混合发电系统。多联产系统旨在满足位于西班牙萨拉戈萨的商业中心的电力和冷却需求。抛物槽式集热器场与热能存储相结合,辅助生物质锅炉将热量提供给有机朗肯循环(ORC),有机朗肯循环(ORC)产生电力来满足电力需求并在机械冷却器中产生冷却。生物质锅炉支持太阳能发电,以确保向ORC提供稳定可靠的热量。该系统已连接到电网,因此可以进行电力购买和销售。进行设备选型的目的是在商业中心消耗的总电力中实现较高的可再生比例。对拟建工厂的分析包括全年的每小时运行,辅以经济评估,考虑投资和运营成本以及对工厂的环境效益的估计。此外,还进行了热经济分析,以确定工厂内部流程和最终产品的成本形成过程。每个流程的单位成本分为投资和运营成本两个部分。对投资成本,利率,生物质价格和电价折价进行了敏感性分析。结果表明,从经济角度来看,该系统目前尚不可行,因为发电成本(279.07€/ MWh)远高于购电价(126.70€/ MWh)。就环境而言,该系统能够置换96.1%的二氧化碳与仅消耗电网电力的常规系统相比,排放量仅为2,占不可再生一次能源消耗的85.6%。

更新日期:2021-01-10
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