Performance analysis and optimization of combined cooling, heating and power system based on carbon dioxide energy storage

Carbon dioxide energy storage is a new energy storage technology, which has excellent thermodynamic, economic and environmental performance. In this paper, a thermo-electric energy storage system based on water storage, including two carbon dioxide cycles of heat pump charging and heat engine discharging, is established by Aspen Hysys software. And the characteristics of combined cooling, heating and power technology is further investigated. A multi-objective optimization model for maximum energy efficiency and economic benefit considering user demand is built. Taking a typical daily load demand of cooling, heating and power as an example, the Pareto front of the system operation scheme is calculated based on genetic algorithm. The two objective functions are weighted by the entropy weight method considering information entropy, and a suitable operation configuration is selected by TOPSIS method. The study provides a reference for multi-function operation scheduling optimization. Besides, development prospect and existing challenges of the system are discussed preliminarily.