Abstract
Cogeneration of heat and power systems based on the organic Rankine cycle (ORC-CHP) has been proven to be an effective way to utilize waste heat at medium and low temperatures. In this work, three ORC-CHP (combined heat and power based on organic Rankine cycle) systems are simulated and compared, including the SS (serial system), the CS (the condensation system), and the SS/CS. The multi-objective genetic algorithm (MOGA) is used to optimize the three systems respectively to achieve higher exergy efficiency and profit ratio of investment (PRI). The optimal thermal-economic performance is obtained. Twelve organic fluids are adopted to evaluate their performance as working fluids. The calculation results show that SS has the highest exergy efficiency, while SS/CS has the best economic performance. Compared with the highest exergy efficiency of SS and the best economic performance of SS/CS, CS will be the optimal solution considering these two objective functions. Under the optimal working conditions, SS has the highest thermal efficiency because it has the highest net power output. The components with the largest proportion of exergy destruction are the heat exchangers, which also has the highest cost.
Highlights
The energy problem is an important factor affecting the development of human society and economy
The results showed that two-stage series organic Rankine cycle (TSORC) is superior to organic Rankine cycle (ORC) in terms of net power output when the flue gas temperature is between 200 and 300 ◦ C, and ORC has more advantages in terms of economic performance because the increased investment of TSORC is lower than the income
The optimization results of different organic working fluids adopted in the three size different heat source temperatures200
Summary
The energy problem is an important factor affecting the development of human society and economy. How to effectively utilize the limited energy to promote social development in a sustainable way has always been a research hotspot. Due to the limited technical level, these heat sources have not been fully used, and the utilization rate is not high, especially for some low-temperature heat [2]. In the process of industrial production, at least 50% of the energy is wasted, mainly in the form of low-grade waste heat [3]. Recycling these low-temperature waste heat sources is an important way to improve energy utilization efficiency
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