Thermodynamic analysis and performance optimization of transcritical power cycles using CO2-based binary zeotropic mixtures as working fluids for geothermal power plants
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Thermodynamic analysis and performance optimization of transcritical power cycles using CO2-based binary zeotropic mixtures as working fluids for geothermal power plants
- 发表刊物：
- APPLIED THERMAL ENGINEERING
- 摘要：
- Transcritical power cycles (TPCs) using CO2-based binary zeotropic mixtures for the conversion of lowgrade
geothermal water at 100–150 C into power are presented and analyzed when cooling water temperature
(Tcw) is 10–30 C in this paper. 6 refrigerants are selected as the additives into CO2 according to 2
criteria. Performances of TPCs with 6 selected CO2-based mixtures are optimized by pattern search algorithm
(PSA). Thermodynamic and economic analyses are conducted. The results reveal that R161/CO2 is
the best fluid for a TPC in terms of both thermal performance and economic performance while R290/CO2
might be an unsuitable working fluid in TPC due to its lower thermal performance. When Tcw = 10–20 C,
a TPC using R161/CO2 at XR161 = 0.7 can increase net power output by 14.43–50.46% and decrease cost per
net power by 27.96–48.72% compared with a TPC using CO2. The selected CO2-based mixtures can reduce
CPP of a TPC compared with CO2 although more heat transfer area is required. Meanwhile, the CO2-based
mixtures can decrease the high operating pressure, and enlarge the condensing temperature range compared
with CO2. In addition, the CO2-based mixtures except R161/CO2 and R152a/CO2 are not recommended
for a TPC when Tcw is low.
- 合写作者：
- 吴闯，王顺森，蒋希航，李军
- 卷号：
- 115
- 页面范围：
- 292-304
- 是否译文：
- 否
- 发表时间：
- 2017-08-25