Complete formula for calculating air energy storage capacity

How is energy stored in a low demand space?

In low demand periods, energy is stored by compressing air in an air tight space (typically 4.0~8.0 MPa) such as an underground storage cavern. To store energy, air is compressed and sealed in the space. To extract the stored energy, compressed air is drawn from the storage vessel, mixed with fuel, and then combusted. The expanded air is then passed through a turbine.

Where will compressed air be stored?

In a Compressed Air Energy Storage system, the compressed air is stored in an underground aquifer. Wind energy is used to compress the air, along with available off-peak power. The plant configuration is for 200MW of CAES generating capacity, with 100MW of wind energy.

Does compressed air energy storage improve the profitability of existing power plants?

The use of Compressed Air Energy Storage (CAES) improves the profitability of existing Simple Cycle, Combined Cycle, Wind Energy, and Landfill Gas Power Plants.\n\nNakhamkin, M. and Chiruvolu, M. (2007). Available Compressed Air Energy Storage (CAES) Plant Concepts. In: Power-Gen International, Minnestota.

How do you calculate the storage volume of a compressed gas?

The storage volume for a compressed gas is calculated using Boyle's Law: p_aV_a = p_cV_c = constant, where p_a is the atmospheric pressure, V_a is the volume of the gas at atmospheric pressure, p_c is the pressure after compression, and V_c is the volume of gas after compression.

How much energy does an air engine use?

Thus: a system where we heat the air for an air engine (heat added to keep it isothermal) - 1.5kWhr is the available energy. A 33% effcient air engine gets us 500Whr. This is not bad, worth pursuing. Essentially: 1/2kWhr of storage for a $300 tank cost. This paper shows 70% efficient engines.

How much energy is stored in a gas cylinder?

Energy stored in a cubic meter of volume at 70 bar is 6.3 kWhr. . Compare to 300 cu ft - which correcponds to 42l volume inside - 0.04 cu meter - but equiv to 0.1 of the above if done at 200 bar - then energy stored in the gas cylinder is 0.6 kWhr. And before, we said we have 12 minutes of 0.75 kW.