How to design organic Rankine cycle system under fluctuating ambient temperature: A multi-objective approach

摘要: Abstract Affected by the fluctuating ambient temperature, organic Rankine cycle (ORC) system deviates from design point during operation, resulting in deterioration of performance. How to best ORC considering temperature is an important and challenging topic. This study proposes a multi-objective approach determine optimal system, based on hourly off-design operating conditions. The concept ( T a,opt d ) introduced represent multiple parameters. Its specific value, relationship with characteristics, variation for three different target variables two configurations are revealed. results 15 cities climate zones indicate that, although average value annual av itself not point, it significantly affects . To maximize lifetime electricity generation, should be designed 5 °C lower than In contrast, if optimization objective net present higher Moreover, compared conventional where 20 °C or , using can increase production 7% 0.8%, respectively. Furthermore, effects market parameters including discount rate price also revealed sensitivity analysis.