Energy and exergy analyses of a modified combined cooling, heating, and power system using supercritical CO2

Energy and exergy analyses of a modified combined cooling, heating, and power system using supercritical CO2
复制标题

使用超临界二氧化碳对改进的冷却、加热和电力联合系统进行能量和火用分析

DOI:
10.1016/j.energy.2015.04.043
复制
发表时间:
2015-06
期刊:
影响因子:
9
通讯作者:
Yourong Li
Yourong Li
中科院分区:
工程技术1区
文献类型:
--
作者:
Chao Liu;Xiang Fu;Hong Gao;Yourong Li

文献摘要

参考文献

被引文献

相似文献

为了减少温室气体排放,提高低品位热效率,提出了一种利用超临界CO2的改进型冷热电联供系统。该循环通过增加抽气涡轮机将布雷顿循环和跨临界喷射制冷循环结合起来。建立了改进型冷热电联供系统的数学模型。通过参数分析和火用分析,研究了关键热力学参数对系统性能和火用损失的影响。针对冷热电联供系统热效率评价的困难,引入了一种更实用的性能指标来量化系统性能。结果表明,较高的抽气速率和抽气压力均有利于制冷量的增加。在所考虑的工况下,采用抽汽涡轮机的改进型冷热电联供系统的(火用)效率比不采用抽汽涡轮机的改进型冷热电联供系统的(火用)效率提高了10.4%~ 22.5%。此外,随着涡轮机入口温度的增加,涡轮机的功率输出和(火用)效率有很大的增加。结果表明,热源质量的提高有利于系统性能的提高。
In aim to reduce the greenhouse-gas emissions and improve the low-grade heat efficiency, a modified CCHP (combined cooling, heating, and power) system is proposed using supercritical CO2. This cycle combines a Brayton cycle and a transcritical ejector refrigeration cycle by adding an extraction turbine. A mathematical model is developed to simulate the modified CCHP system. Parametric analysis and exergy analysis are conducted to investigate the effects of key thermodynamic parameters on the performance and exergy destruction. Due to the difficulties in the thermal efficiency evaluation for CCHP system, a more practical performance metric is introduced in order to quantify system performance. The results indicate that both higher extraction rate and extraction pressure are helpful to gain more refrigeration. For the conditions considered, the exergy efficiency of the modified CCHP with the extraction turbine is higher than that of the CCHP with the no-extraction turbine from 10.4% to 22.5%. Furthermore, there is a large increase in the turbine power output and the exergy efficiency with increased turbine inlet temperature. It reveals that a rise of heat source quality benefits the system performance.
太阳能驱动的跨临界二氧化碳新型冷热电联产系统的参数分析
DOI: 10.1016/j.apenergy.2012.01.007
发表时间: 2012-06
期刊: Applied Energy
影响因子: 11.2
作者:
Wang Jiangfeng;Zhao Pan;Niu Xiaoqiang;Dai Yiping
通讯作者: Dai Yiping
DOI: 10.1016/j.energy.2008.04.007
发表时间: 2008-09
期刊: Energy
影响因子: 9
作者:
J. Sarkar
通讯作者: J. Sarkar
DOI: 10.1016/c2013-0-00894-8
发表时间: 2012-05
期刊: --
影响因子: --
作者:
T. Kotas
通讯作者: T. Kotas
DOI: 10.5860/choice.33-4516
发表时间: 1995-11
期刊: --
影响因子: --
作者:
A. Bejan;G. Tsatsaronis;M. J. Moran
通讯作者: A. Bejan;G. Tsatsaronis;M. J. Moran
DOI: 10.1016/j.ijrefrig.2008.06.007
发表时间: 2009-05
期刊: International Journal of Refrigeration-revue Internationale Du Froid
影响因子: --
作者:
A. Khaliq
通讯作者: A. Khaliq