团队硕士生夏振华关于中深层地热能供暖系统性能和经济性的研究成果“Analysis of economy, thermal efficiency and environmental impact of geothermal heating system based on life cycle assessments”发表于Applied Energy期刊。

 Figure 1. Monte Carlo analysis of two BHEs.                     Figure 2. The proportion of carbon emission in different stages of two BHEs.

在本研究中，采用基于生命周期节约模型的蒙特卡罗模拟来评估同轴井和对接井两种换热器系统的经济性，并通过平准化能源成本对两种地热供暖系统的热经济性进行综合评估，最后采用碳强度对地热系统的环境影响进行评价。结果表明，同轴井和水平对接井系统的投资回收期分别为6.7-9.2年和9.1-11.7年。从生命周期的角度来看，同轴井的平准化能源成本和碳强度分别为$ 8.67–9.35/GJ和70.43–80.86 g(CO₂₎/kWh，略高于对接井。进一步揭示了与传统加热方法相比，深层地热供暖系统更符合低碳政策，同时从生命周期的角度来看，钻井施工和运行阶段是碳排放的主要原因。

In this study, the Monte Carlo simulation and sensitivity analysis based on life cycle saving are employed to evaluate the economy of the two borehole heat exchanger systems. The heat extraction considering both performance and economic factors is examined by the levelized cost, while the environmental impact is assessed by the carbon intensity analysis. The results showed that the payback periods of a coaxial borehole heat exchanger system and a horizontally-butted borehole heat exchanger system are 6.7-9.2 years and 9.1-11.7 years respectively. From the life cycle perspective, the levelized cost of energy and carbon intensity of the coaxial borehole heat exchanger is $ 8.67-9.35/GJ and 70.43-80.86 g(CO₂)/kWh, slightly higher than those of the butted borehole heat exchanger. It can be proved that the two borehole heat exchangers are more in line with the low-carbon policy than the traditional heating methods, and the well construction and operation phase contributes a major carbon emission from the perspective of the life cycle.

论文链接：http://doi.org/10.1016/j.apenergy.2021.117671