Abstract
The comprehensive utilization technology of combined cooling, heating and power (CCHP) systems is the leading edge of renewable and sustainable energy research. In this paper, we propose a novel CCHP system based on a hybrid trigenerative compressed air energy storage system (HT-CAES), which can meet various forms of energy demand. A comprehensive thermodynamic model of the HT-CAES has been carried out, and a thermodynamic performance analysis with energy and exergy methods has been done. Furthermore, a sensitivity analysis and assessment capacity for CHP is investigated by the critical parameters effected on the performance of the HT-CAES. The results indicate that round-trip efficiency, electricity storage efficiency, and exergy efficiency can reach 73%, 53.6%, and 50.6%, respectively. Therefore, the system proposed in this paper has high efficiency and flexibility to jointly supply multiple energy to meet demands, so it has broad prospects in regions with abundant solar energy resource.
Highlights
Nowadays, the balance between cooling, heating and power supply and demand has become a key issue in many countries, due to the increasing penetration of intermittent renewable energy source (RES) and distributed generation (DG) [1,2]
WCOM · τch + ExHTF · τc where Qheat is the thermal energy supply to the heat load, QCS is the cooling energy that generated by absorption chiller supply to the residents collected and stored solar thermal energy, Exheat is enthalpy exergy of Qheat, ExHTF is the heat transfer fluid (HTF) enthalpy exergy absorbed by the parabolic trough collector (PTC), and ExCS is enthalpy exergy of QCS
The pressure of the outlet air of the throating valve, which is determined by the expansion ratio of each stage
Summary
The balance between cooling, heating and power supply and demand has become a key issue in many countries, due to the increasing penetration of intermittent renewable energy source (RES) and distributed generation (DG) [1,2]. Apart from micro-CAES acting as CCHP, another promising solution for improving the performance of the above system is hybrid external solar thermal energy and CAES (ST-CAES), which could notably enhance the storage heat temperature and capacity [22]. Proposed a gas turbine combined solar energy and CAES system and focused on process design and efficiency analysis. Mohammadi et al [29] analyzed an integrated micro gas turbine, compressed air energy storage, and solar dish collector system. The bottomgaspart the last stage of the expander before entering the turbo expander and is further heated by the highis a small-scale AA-CAES system where compression heat generated in the charging process is stored temperature VP-1 of the heat exchanger (HE5–HE7) to enhance the comprehensive efficiency of HTin the high-temperature water tank (HWT) to provide heat for residents. An HT-CAES is mainly composed of five units, i.e., compression air storage unit (COM), air turbine
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