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低温余热喷射式发电制冷系统工质选择

发表时间:2016-07-31  浏览量:1710  下载量:368
全部作者: 解西敏,赵良举,张墨耕,熊壮
作者单位: 重庆大学动力工程学院
摘 要: 以低温余热为热源,把循环系统的制冷量、热效率以及㶲效率作为热力学评价指标,根据热力学第一定律以及热力学第二定律,对喷射式发电制冷复合系统的工质进行研究。根据工质性质,选择R141b、R245fa、R600、R600a、R601以及R601a共6种有机工质作为系统的循环工质,在定热源温度下分析蒸汽发生温度、冷凝温度、制冷蒸发温度变化对系统的制冷量、热效率以及㶲效率的影响,并且选择出适合的系统循环工质。结果表明,系统的制冷量和热效率随蒸汽发生温度和制冷蒸发温度的升高而升高,随冷凝温度的升高而降低,系统的㶲效率随制冷蒸发温度的升高而升高,随蒸汽发生温度以及冷凝温度的升高而下降;工质R245fa作为循环系统的工质时,制冷量输出较大,工质R600及R600a拥有最高的㶲效率以及较高的制冷量和热效率。
关 键 词: 工程热物理;工质;热力学性能;发电制冷复合系统
Title: Working fluid selection for combined power and ejector refrigeration cycle driven by low-temperature waste heat
Author: XIE Ximin, ZHAO Liangju, ZHANG Mogeng, XIONG Zhuang
Organization: School of Power Engineering, Chongqing University
Abstract: In the system, the low temperature waste heat was selected as the heat source. The refrigerating capacity, thermal efficiency and exergy efficiency were chosen as thermodynamic evaluation indexes of the combined cycle. According to the first and second low of thermodynamic, the thermodynamic performance of the system was studied. According to the properties of the fluids, R141b, R245fa, R600, R600a, R601 and R601a were selected as working fluids. For the given heat source temperature of the system, the effect of the generating temperature, compensating temperature, and evaporating temperature on the cooling capacity, system efficiency and exergy efficiency were calculated and analyzed. The results show that the cooling capacity and system efficiency is increased with the generating temperature and evaporating temperature and decreased with the compensating temperature; the exergy efficiency is increased with the evaporating temperature and decreased with the generating temperature and compensating temperature. Under the same conditions, fluid R245fa has high cooling capacity among the researched working fluids, R600 and R600a has the highest of energy efficiency as well as higher cooling capacity and system efficiency.
Key words: engineering thermophysics; working fluid; thermodynamics performance; combined power and ejector refrigeration cycle
发表期数: 2016年7月第14期
引用格式: 解西敏,赵良举,张墨耕,等. 低温余热喷射式发电制冷系统工质选择[J]. 中国科技论文在线精品论文,2016,9(14):1421-1430.
 
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