Design of a novel geothermal heating and cooling system: Energy and economic analysis
Design of a novel geothermal heating and cooling system: Energy and economic analysis
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DOI：
10.1016/j.enconman.2015.11.001
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发表时间：
2016-01
影响因子：
10.4
通讯作者：
G. Angrisani;G. Diglio;M. Sasso;F. Calise;M. D. d’Accadia
中科院分区：
文献类型：
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作者：
G. Angrisani;G. Diglio;M. Sasso;F. Calise;M. D. d’Accadia
在 TRNSYS 环境中进行了动态模拟研究，以评估基于低或中焓地热源与空气处理装置（包括干燥剂轮）之间耦合的新型加热和冷却系统的能源和经济性能。在夏季，井下换热器提供热量以再生干燥剂材料，同时井中不断抽取一定量的地热流体以维持较高的工作温度。同时，提取的地热流体驱动吸收式制冷机，为空气处理机组的冷却盘管产生冷冻水。相反，在冬季，地热能用于满足一定量的空间供暖需求。在夏季和冬季运行模式下，也使用地热能来供应生活热水。我们分析了一个案例研究，其中位于伊斯基亚（意大利南部那不勒斯附近的一个岛屿）的现有低热值地热井（96°C）用于驱动地热系统。结果表明，所提出系统的性能受到生活热水利用率的显着影响。事实上，考虑到该参数在 5% 到 100% 之间的变化范围，一次节能率从 77% 增加到 95%，投资回收期从 14 年减少到 1.2 年。模拟证明了所提出系统的技术和经济可行性。事实上，与文献中可用的类似系统的比较指出，这项工作中提出的布局的特点是具有更好的能源和经济性能，特别是在最佳场景下。最后，敏感性分析表明系统性能主要受标称地热流量和天然气成本的影响。
A dynamic simulation study in TRNSYS environment has been carried out to evaluate energy and economic performance of a novel heating and cooling system based on the coupling between a low or medium-enthalpy geothermal source and an Air Handling Unit, including a Desiccant Wheel.During summer season, a Downhole Heat Exchanger supplies heat to regenerate the desiccant material, while a certain amount of geothermal fluid is continuously extracted by the well in order to maintain high operating temperatures. Simultaneously, the extracted geothermal fluid drives an absorption chiller, producing chilled water to the cooling coil of the Air Handling Unit. Conversely, during the winter season, geothermal energy is used to cover a certain amount of the space heating demand. In both summer and winter operation modes, a geothermal energy is also used to supply Domestic Hot Water. A case study was analyzed, in which an existing low-enthalpy geothermal well (96 °C), located in Ischia (an island close to Naples, Southern Italy), is used to drive the geothermal system. Results showed that the performance of the proposed system is significantly affected by the utilization factor of Domestic Hot Water. In fact, considering a range of variation of such parameter between 5% and 100%, Primary Energy Saving increase from 77% to 95% and Pay-Back Period decreases from 14 years to 1.2 years, respectively. The simulations proved the technical and economic viability of the proposed system. In fact, a comparison with similar systems available in literature pointed out that the layout proposed in this work is characterized by better energy and economic performance, especially in the best scenario. Finally, a sensitivity analysis showed that the system performance is mainly affected by the nominal geothermal flow rate and by natural gas cost.