Thermodynamic analysis of heat driven Combined Cooling Heating and Power system (CCHP) with energy storage for long distance transmission
Thermodynamic analysis of heat driven Combined Cooling Heating and Power system (CCHP) with energy storage for long distance transmission
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DOI：
10.1016/j.enconman.2017.10.058
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发表时间：
2017-12
影响因子：
10.4
通讯作者：
B. Han;W. Cheng;Yi-Yi Li-Yi;Yong-Le Nian
中科院分区：
文献类型：
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作者：
B. Han;W. Cheng;Yi-Yi Li-Yi;Yong-Le Nian
低品位热源和可再生能源的不稳定性和间歇性带来了利用问题，而且在大多数情况下，能源源点距离能源需求点较远，如何实现能源的远距离输送一直是一个挑战。为解决上述问题，提出了一种新型的电力、制冷与溶液蓄能相结合的无保温远程供热/制冷系统。该系统将卡利纳循环与溶液储能循环相结合，基于浓氨液、弱氨液和液氨的浓度差，可根据热源和客户需求灵活改变运行方式。建立了分析模型，并进行了(火用)破坏分析，给出了部件的(火用)损失分布。优化后的系统(火用)效率为0.57，最大溶液储能密度达到523 MJ/m~3。此外，热能以潜热的形式储存，工质在环境温度下输送，因此不需要隔热，最大供热距离为143 km，是典型热水传输系统的15.7倍，管径减少到3/20，大大降低了水泵的工程量和建设成本。
The instability and intermittency feature of low grade heat sources and renewable energy brought about utilization problems, and in most cases, energy source site locates far away from energy demand site, how to implement long distance transmission of energy has been a challenge. To solve above problems, a novel combined power, cooling with solution energy storage and long distance heating/cooling system without heat preservation is proposed. The system integrates Kalina cycle with solution energy storage cycle, which is based on concentration difference of ammonia-strong, ammonia-weak solutions and liquid ammonia, and capable of changing operation modes flexibly according to heat sources and client needs. An analytical model is established and exergy destruction analysis is conducted to indicate exergy losses distribution of components. After optimization of proposed system, exergy efficiency is 0.57, and maximum solution energy storage density reaches 523 MJ/m3. Furthermore, thermal energy is storaged in the form of latent heat, and the working fluids are transported under ambient temperature, therefore, thermal insulation are unnecessary, the maximum heat supply distance is 143 km, 15.7 times that of typical hot water transmission system, and pipe diameter is reduced to 3/20, pump work consumption and construction costs can be reduced dramatically as a consequence.