Abstract
Adiabatic compressed air energy storage (A-CAES) is an effective balancing technique for the integration of renewables and peak-shaving due to the large capacity, high efficiency, and low carbon use. Increasing the inlet air temperature of turbine and reducing the compressor power consumption are essential to improving the efficiency of A-CAES. This paper proposes a novel solar–thermal-assisted A-CAES system (ST-CAES), which features a higher inhale temperature of the turbine to improve the system efficiency. Solar–thermal energy, as an external thermal source, can alleviate the inadequate temperature of the thermal energy storage (TES), which is constrained by the temperature of the exhaust air of the compressor. Energy and exergy analyses were performed to identify ST-CAES performance, and the influence of key parameters on efficiency were studied. Furthermore, exergy efficiency and the destruction ratio of each component of ST-CAES were investigated. The results demonstrate that electricity storage efficiency, round-trip efficiency, and exergy efficiency can reach 70.2%, 61%, and 50%, respectively. Therefore, the proposed system has promising prospects in cities with abundant solar resources owing to its high efficiency and the ability to jointly supply multiple energy needs.
Highlights
Modern cities are facing environmental and energy shortage issues, and the large-scale development and utilization of renewable energy sources (RES) in smart cities is a primary strategy for addressing those issues [1]
The major contributions of this paper are: (1) A novel hybrid Adiabatic compressed air energy storage (A-compressed air energy storage (CAES)) based on the utilization of solar energy, which can be used for RES integration and peak-shaving and, could significantly improve the round-trip efficiency, is proposed and analyzed; (2) Compared to the current Hybrid A-CAES (HA-CAES), solar–thermal-assisted A-CAES system (ST-CAES) eliminates the combustion chamber that has already been proposed in [22]
The STC consists of a parabolic trough collector (PTC), a low-temperature oil tank (LOT), and a the four-stage compressor can meet the requirement of maximum air pressure in steel pipeline tank (SPT)
Summary
Modern cities are facing environmental and energy shortage issues, and the large-scale development and utilization of renewable energy sources (RES) in smart cities is a primary strategy for addressing those issues [1]. The major contributions of this paper are: (1) A novel hybrid A-CAES based on the utilization of solar energy, which can be used for RES integration and peak-shaving and, could significantly improve the round-trip efficiency, is proposed and analyzed; (2) Compared to the current HA-CAES, ST-CAES eliminates the combustion chamber that has already been proposed in [22]. This is associated with the influence of primary parameters on system performance in Section 4, followed by
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