Compressed Air Energy Storage Calculations
Compressed air energy storage or gravity water storage costs 10x less than any other based on 100 year vs 10 year lifetime of the system.
Contents
About
- 'Only 10% to 20% of the energy required to generate compressed air ever reaches the point of use' - [1]
- This could be true if compressor efficiency is 60% and tool efficiency is 20-30% for standard air tools.
- 7-8 hp input to compressor yields 1 hp at the air tool shaft. [2]
Losses:
Calculations
- Work to compress, thus energy stored in isothermal conditions - is W = P1V1 * ln(P2/P1) [3]
- Units of Pascals, Meters, Joules.
- W=2E7 Pa * 0.05 cubic meters * ln(200)=5.3MJ=1.5 kWhr
Ok.
- Adiabatic compression - [W = P1V1 - P2V2 / (1 - γ)] [4]
- Let's take industrial gas cylinders with K, T, 3K, 6K standards - 300 cu ft for T [5]. 2200-2600 psi is the standard, but also 3000 PSI and 6000 PSI.
- T type - 300 cf
Other
- 150 PSI, 660 gal receiver tank - $3500 [6]
Links
- Full treatment at Compressed Air Calculations
