Process modelling and performance assessment of an osmotic energy storage system based on reverse osmosis : forward osmosis with a pressure exchanger
Karimaddini, Mojtaba (2026)
Katso/
Sisältö avataan julkiseksi: 15.06.2028
Diplomityö
2026
School of Energy Systems, Energiatekniikka
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2026061571094
https://urn.fi/URN:NBN:fi-fe2026061571094
Tiivistelmä
As wind and solar generation expand in low-carbon electricity systems, storage is increasingly needed to manage generation–demand imbalances that persist over many hours or days. Osmotic Energy Storage (OES) offers a process route in which energy is stored as a salinity difference between two liquid streams.
This thesis develops and assesses a steady-state OES model in EBSILON Professional. The model represents reverse osmosis charging, forward osmosis discharge, and pressure exchange through user-defined components. It compares baseline and pressure-exchanger-assisted configurations within the same process boundary. Model validation is carried out for the baseline configuration using experimental data, while the PX-assisted configuration is assessed through internal consistency checks.
The results show that pressure exchange acts mainly on the charging side. In the base case, net charging input decreases from 7,060.851 to 5,808.350 kW, whereas net discharge output remains almost unchanged, from 1,424.104 to 1,423.932 kW. Efficiency therefore increases from 20.17% to 24.52%. The increase comes mainly from lower charging input rather than higher discharge output.
This thesis develops and assesses a steady-state OES model in EBSILON Professional. The model represents reverse osmosis charging, forward osmosis discharge, and pressure exchange through user-defined components. It compares baseline and pressure-exchanger-assisted configurations within the same process boundary. Model validation is carried out for the baseline configuration using experimental data, while the PX-assisted configuration is assessed through internal consistency checks.
The results show that pressure exchange acts mainly on the charging side. In the base case, net charging input decreases from 7,060.851 to 5,808.350 kW, whereas net discharge output remains almost unchanged, from 1,424.104 to 1,423.932 kW. Efficiency therefore increases from 20.17% to 24.52%. The increase comes mainly from lower charging input rather than higher discharge output.