Energy stored in compressed air?

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SUMMARY

The discussion focuses on calculating the energy stored in compressed air during an adiabatic process. The user is compressing 174 cubic feet per minute into 35 cubic feet, with a temperature increase from 70°F to 550°F. To determine the available heat energy, one must utilize the internal energy values from thermodynamic property tables and apply the first law of thermodynamics, which states that the sum of heat energy equals the sum of work done. This calculation involves multiplying the change in internal energy by the flow rate.

PREREQUISITES
  • Understanding of thermodynamics, specifically the first law of thermodynamics.
  • Familiarity with adiabatic processes in thermodynamic systems.
  • Knowledge of thermodynamic property tables for internal energy calculations.
  • Basic skills in fluid dynamics related to air compression.
NEXT STEPS
  • Research the calculation of internal energy changes using thermodynamic property tables.
  • Study the principles of adiabatic processes in greater detail.
  • Learn about the specific heat capacities of air at varying temperatures.
  • Explore practical applications of compressed air energy storage systems.
USEFUL FOR

Engineers, thermodynamics students, and professionals involved in energy storage systems or compressed air applications will benefit from this discussion.

kevinv
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Hi, I am trying to figure out how much energy is stored in compressed air. I have figured out that a device I am looking at compresses about 174 cubic feet per minute into 35 cubic feet and that the temperature would rise from 70 F to 550 F.

I now want to know how much energy, in the form of heat, is available. I am assuming it is an adiabatic process.

Can you help me understand how I calculate the energy?

Thank you!
 
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You can just take the internal energy (after-before) from a table of thermodynamic properties and multiply by the flow rate.
 
according to thermodynamics 1st law sum of heat energy equal to sum of workdone so u have to calculate amount of energy
 

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