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Design Example: Flow Through a Fire Extinguisher01:12

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Water-Spray-Cooled Quasi-Isothermal Compression Method: Water-Spray Flow Improvement.

Guanwei Jia1, Xuanwei Nian2,3, Weiqing Xu2,3

  • 1School of Physics and Electronics, Henan University, Kaifeng 475004, China.

Entropy (Basel, Switzerland)
|July 2, 2021
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Summary
This summary is machine-generated.

This study introduces a novel water-spray flow rate control for quasi-isothermal compressed air energy storage (AA-CAES). Optimizing water flow reduces energy consumption by matching heat transfer to compression power.

Keywords:
compressed-air energy storageflow improvementheat transferquasi-isothermal compressionwater-spray cooling

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Area of Science:

  • Energy Storage
  • Mechanical Engineering
  • Thermodynamics

Background:

  • Advanced adiabatic compressed-air energy storage (AA-CAES) faces heat energy losses.
  • Water-spray cooling in compressed air energy storage improves compression efficiency.
  • The energy impact of water spray itself requires careful management.

Purpose of the Study:

  • To develop a water-spray cooling strategy for quasi-isothermal compressed air energy storage that minimizes energy consumption.
  • To address the challenge of managing heat generated during air compression at increasing pressures.
  • To optimize the water flow rate for effective heat transfer during the compression cycle.

Main Methods:

  • A time-sequenced water-spray flow rate algorithm was designed.
  • Real-time water-spray flow rate is determined by the difference between compression power and heat-transfer power.
  • The proposed method was compared against a uniform water flow rate strategy.

Main Results:

  • The compression process generates increasing amounts of heat as air pressure rises.
  • A dynamic water-spray flow rate effectively matches the variable heat transfer requirements.
  • The optimized flow rate strategy resulted in reduced overall energy consumption compared to uniform flow.

Conclusions:

  • Water-spray-cooled quasi-isothermal compressed air energy storage can mitigate heat losses inherent in AA-CAES.
  • A dynamic, algorithm-controlled water-spray flow rate is more energy-efficient than a constant rate.
  • This approach offers a viable method for enhancing the efficiency of compressed air energy storage systems.