Simulation and evaluation of a CCHP system with exhaust gas deep-recovery and thermoelectric generator
Simulation and evaluation of a CCHP system with exhaust gas deep-recovery and thermoelectric generator
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DOI：
10.1016/j.enconman.2014.06.036
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发表时间：
2014-10
影响因子：
10.4
通讯作者：
Wang Jialong;J. Wu;C. Zheng
中科院分区：
文献类型：
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作者：
Wang Jialong;J. Wu;C. Zheng
冷热电联产(CCHP)系统被认为在能源利用方面具有很高的效率。但仍有进一步提高系统性能的潜力。提出了一种用于发电、制冷和生活热水生产的基于内燃机(ICE)的冷热电联产系统。为了有效地回收内燃机废气余热，采用了热电机组和冷凝式换热器。所有的能量流程都是基于能量梯级利用的原则来设计的。根据一台16kW内燃机的试验结果，对冷热电联产系统从怠速到满载的特性进行了仿真研究。特别是对三甘醇和吸收式制冷机的部分负荷性能进行了模拟和讨论。为使生活热水温度保持在一定范围内，确定了适宜的内燃机运行区域和给水流量。结果表明，由于排气冷凝余热的回收，系统一次能源效率可达0.944。一次节能率可达0.304，成本节约率可达0.417。考虑到再增加一些设备，总投资增量约为11.1%。
Combined cooling, heating and power (CCHP) systems are thought to be highly efficient in energy utilization. But there are still potentials to further improve system performance. This work proposed a CCHP system based on internal combustion engine (ICE) for power generation, refrigeration and domestic hot water production. Thermoelectric generator (TEG) and condensing heat exchanger are applied to efficiently recover the exhaust gas waste heat of ICE. All the energy flows are designed based on energy cascading utilization principle. Basing on the test results of a 16 kW ICE, CCHP system characteristics are investigated by simulation from idling condition to full load condition. Especially, the part load performance of TEG and absorption chiller are simulated and discussed. The feasible operating zone of ICE and feed water flow rate are figured out to keep the domestic hot water temperature within a certain range. Results show that the primary energy efficiency of system can reach 0.944, thanks to the condensing heat recovery from exhaust gas. The primary energy saving ratio and cost saving ratio can reach 0.304 and 0.417, respectively. Considering some more equipment is incorporated, the total investment increment is about 11.1%.