Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 227, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2020.113566
Keywords
Combined cooling and power system; Ejector refrigeration cycle; Nuclear power; Multi-objective optimization
Categories
Funding
- National Natural Science Foundation of China [51776020]
- Chongqing Postdoctoral Science Foundation [cstc202jcyj-bshXOO73]
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A novel combined cooling and power system integrating sCO2 recompression Brayton cycle with E-TCRC is proposed to utilize nuclear power effectively. The system performance is evaluated and optimized through mathematical and economic models, with exergy efficiency and total product unit cost as main criteria.
A novel combined cooling and power (CCP) system integrating a supercritical carbon dioxide recompression Brayton cycle with an ejector transcritical carbon dioxide refrigeration cycle (E-TCRC) is proposed to realize the effective utilization of nuclear power. In the proposed system, a portion of CO2 exiting the pre-cooler is used to drive the E-TCRC for generating cooling and recovering partial waste heat of sCO(2) turbine exhaust. The mathematical model and economic model of the proposed system are established under steady-state conditions. Besides, the exergy efficiency and total product unit cost of the system are selected as the main criteria to evaluate system performance. Parametric analysis is applied to study the effects of four key parameters on the system performance. The CCP system, conventional separated cooling and power (C-SCP) system and ejector separated cooling and power (E-SCP) system are optimized by single-objective and multi-objective optimization. Single-objective optimization reveals that the exergy efficiencies of the CCP system are up to 1.08%pt (percentage point), 0.80%pt and 0.47%pt higher than those of the C-SCP system at the corresponding evaporation temperatures (-20 degrees C,-10 degrees C and 0 degrees C). Besides, the CCP system performs better than the E-SCP system at lower turbine inlet pressures. The multi-objective optimization shows that when the evaporation temperature increases from -20 degrees C to 0 degrees C, the total product unit cost of the CCP system decreases from 10.087 $/GJ to 9.668 $/GJ, and exergy efficiency increases from 59.25% to 60.97%.
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