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Exergetic and exergoeconomic analysis of a novel hybrid solar-geothermal polygeneration system producing energy and water

机译：一种新型的产生能量和水的混合太阳能-地热多热发电系统的能量和能经济分析

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摘要

A dynamic simulation model of a novel solar-geothermal polygeneration system and the related exergetic and exergoeconomic analyses are presented in this paper. The plant is designed in order to supply electrical, thermal and cooling energy and fresh water for a small community, connected to a district heating and cooling network. The hybrid system is equipped with an Organic Rankine Cycle fueled by medium-enthalpy geothermal energy and by a Parabolic Trough Collector solar field. Geothermal brine is also used for space heating and cooling purposes. Finally, geothermal fluid supplies heat to a Multi-Effect Distillation unit, producing also desalinized water from seawater. Dynamic simulations were performed in order to design the system. The overall simulation model, implemented in TRNSYS environment, includes detailed algorithms for the simulation of system components. Detailed control strategies were included in the model in order to properly manage the system. An exergetic and exergoeconomic analysis is also implemented. The exergetic analysis allows to identify all the aspects that affect the global exergy efficiency, in order to suggest possible system enhancements. The accounting of exergoeconomic costs aims at establishing a monetary value to all material and energy flows, then providing a reasonable basis for price allocation. The analysis is applied to integral values of energy and a comparison of results between summer and winter season is performed. Results are analyzed on different time bases presenting energetic, exergetic, economic and exergoeconomic performance data. Results show that global exergy efficiency varies between 40% and 50% during the "Thermal Recovery Mode" operation and between 16% and 20% during the "Cooling mode" operation. It was also found that electricity, chilled water, cooling water and desalinated water exergoeconomic costs vary respectively in the ranges 0.1475-0.1722 (sic)/kW h, 0.1863-0.1888 (sic)/kW h(ex), 0.01612-0.01702 (sic)/kW h(ex) and 0.5695-0.6023 (sic)/kW h(ex). (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文提出了一种新型的太阳-地热多联产系统的动态模拟模型，并进行了相关的能动和能经济分析。该工厂的设计目的是为与社区供热和制冷网络相连的小型社区提供电能，热能和制冷能以及淡水。混合系统配备了有机朗肯循环，该循环由中焓地热能和抛物槽收集器太阳能场提供燃料。地热盐水也用于空间加热和冷却目的。最后，地热流体为多效蒸馏装置提供热量，并从海水中产生淡化水。为了设计系统，进行了动态仿真。在TRNSYS环境中实现的总体仿真模型包括用于仿真系统组件的详细算法。模型中包含了详细的控制策略，以便正确管理系统。还进行了精力充沛的和能动经济分析。充分的分析可以识别影响全局火用效率的所有方面，以建议可能的系统增强。能效经济成本的核算旨在确定所有物质和能量流的货币价值，然后为价格分配提供合理的基础。将该分析应用于能量的积分值，并比较夏季和冬季的结果。在不同的时间基础上对结果进行分析，显示出充满活力，充满活力，经济和人类经济表现的数据。结果表明，在“热恢复模式”运行期间，整体的火用效率在40％至50％之间变化，在“冷却模式”运行期间，整体的效率在16％至20％之间变化。还发现电力，冷冻水，冷却水和淡化水的人为经济成本分别在0.1475-0.1722（sic）/ kW h，0.1863-0.1888（sic）/ kW h（ex），0.01612-0.01702（sic）之间变化）/ kW h（ex）和0.5695-0.6023（sic）/ kW h（ex）。 （C）2016 Elsevier Ltd.保留所有权利。

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