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Spray-cooled compression: Theory and simulation
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DOI：10.1016/j.applthermaleng.2023.120619.png)
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Abstract
En 中文
Compressed air energy storage (CAES) is a low-cost, long-duration, and reliable storage option, but the con-ventional adiabatic approach leads to heat build-up that is lost during storage, rendering poor roundtrip effi-ciency. The efficiency of CAES can be significantly improved with isothermal compression; this can be accomplished with spray cooling during the compression process, where interphase heat transfer reduces the unwanted gas temperature rise. However, the theoretical limits and the key non-dimensional parameters which control the spray-cooling efficiency have not been previously identified to guide the system design and opti-mization. These are addressed in the present study and favorably compared with results from a computational model validated against recently published experimental results for spray-cooled air compression. Using this computational model, a parametric analysis of the design space was performed using a new non-dimensional number for droplet heat transfer speeds, the Crowe number, which was theoretically related to the effective polytropic index of the compression process. The results indicated that a high isothermal efficiency can be achieved with droplet mass loadings of 3 or more coupled with a Crowe number of 0.1 or less. In addition to droplet size and mass loading, the relationship between droplet thermal response time and domain time was found to be an important predictor of performance. The fast-running models developed herein can be used in the design process for CAES systems. Future work is recommended to consider multi-dimensional effects, expansion conditions, and losses due to spray work.
Keywords:
Compressed air energy storage
Spray cooling
Isothermal
Efficiency
Polytropic index
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