Minimizing COP loss from optimal high pressure correlation for transcritical CO2 cycle

作者：Yang Liang; Li Hui; Cal Si Wei; Shao Liang Liang; Zhang Chun Lu^*

来源：Applied Thermal Engineering, 2015, 89: 656-662.

DOI：10.1016/j.applthermaleng.2015.06.023

• CO2
• Transcritical cycle
• High pressure
• Correlation
• Optimization

CO2 transcritical cycle has been successful applied in many refrigeration and heat pump systems. High pressure optimization and control play a critical role in maximizing COP (coefficient of performance) of CO2 transcritical systems. This work reviewed optimal high pressure correlations of transcritical CO2 cycles in open literature and found a potential significant COP loss near the critical pressure due to error propagation from optimal high pressure approximation to actual COP. Therefore, a COP loss minimization method is proposed to restrain the error propagation and obtain more robust high pressure correlation. Case study on the single-stage CO2 transcritical cycle demonstrated that the maximum COP loss from the conventional high pressure optimization method can be significantly reduced from -71% to -0.7% using the new method.

• 出版日期2015-10-5
• 单位同济大学