Thermo-economic analysis of composite district heating substation with absorption heat pump
Thermo-economic analysis of composite district heating substation with absorption heat pump
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DOI：
10.1016/j.applthermaleng.2019.114659
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发表时间：
2020-02
影响因子：
6.4
通讯作者：
Zhangxiang Wu;Yaran Wang;Shijun You;Huan Zhang;Zheng Xuejing;J. Guo;Shen Wei
中科院分区：
文献类型：
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作者：
Zhangxiang Wu;Yaran Wang;Shijun You;Huan Zhang;Zheng Xuejing;J. Guo;Shen Wei
提出并分析了一种新型的吸收式热泵复合式区域供热变电站。该系统由1台水-溴化锂吸收式热泵和2台板式换热器组成，可提高地热水和一次集中供热管网一次供水的利用效率。通过实例研究分析了地热水温度、质量流量和一次供水质量流量变化对系统性能的影响。目标是通过地热水和初级供水的级联利用，实现净利润的最大化和投资回收期的最小化。基于TOPSIS决策方法，进行了经济分析和多目标优化，确定了一次供水的最优质量流量。在最优工况下进行火用损失分析，找出哪些部件的火用损失最大。结果表明，在一次供水质量流量为46.16 kg/s时，系统全寿命净收益为16.22 M$，最小投资回收期为2.2 年，系统COP和火用效率分别为1.85和59.81%。
A novel composite district heating substation (CDHS) with absorption heat pump was proposed and analyzed in this paper. The CDHS was composed of a water-LiBr absorption heat pump and two plate heat exchanges, which could improve the utilization efficiency of geothermal water and the primary supply water of the primary district heating network. The effect of geothermal water temperature and mass flow rate, and primary supply water mass flow rate variation on system performance were investigated and analyzed by case study. The objective was to maximize net profit and minimize payback period by the cascade utilization of the geothermal water and primary supply water. In addition, economic analysis and multi-objective optimization were conducted to find the optimal mass flow rate of the primary supply water based on the TOPSIS decision making method. Exergy loss analysis was applied under the optimal condition to discover which components had the largest exergy loss. Results indicated that, the proposed system had a net profit of 16.22 M$ in the life time and the minimum payback period was 2.2 years at the optimal primary supply water mass flow rate of 46.16 kg/s where the COP and exergy efficiency of the system were 1.85 and 59.81%, respectively.