Which PTEs variant uses supercritical carbon dioxide as the working fluid?

In this article, a PTES variant that uses supercritical carbon dioxide (sCO2) as the working fluid is introduced. sCO2-PTES cycles have higher work ratios and power densities than the systems based on ideal gases that have been investigated to date.

What is the supercritical carbon dioxide Technology program?

The Supercritical Carbon Dioxide Technology Program is focused on developing technologies for the implementation of highly eficient power cycles utilizing supercritical carbon dioxide (CO 2) as the working fluid.

Why is SCO2 a supercritical gas cycle?

To remain supercritical = because increasing the sCO2 cycles have a minimum 2 leads pressure of 80 bar, and the maximum pressure is chosen to be in the range of 240-260 bar. The sCO2 is more dense than argon, so that power densities are higher assumptions made about the loss factors than the ideal-gas cycle.

Why is CO2 a good energy storage fluid?

Carbon dioxide (CO 2), has become an outstanding candidate for the working fluid in compressed gas energy storage systems due to its excellent physical properties . Specifically, CO 2 can reach its critical condition (31.3 °C, 7.38 MPa) or undergo liquefaction much easier compared to air whose critical point being −141 °C, 3.77 MPa.

How does a hot fluid transfer energy to a cold storage media?

The hot fluid transfers its energy to a thermal storage media such as a packed bed of rocks or molten salt (23) before being expanded (and cooled) to its original pressure (34), before finally exchanging heat with the cold storage media (41). The charging process thus creates a cold store and a hot store.

How does a compressed energy storage system work?

For a compressed energy storage system, more CO 2 released during the discharging process leads to more out-put work when the storage pressure (Ps,dis), discharge end pressure (Pe,dis), and tank volume (V) are fixed.