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Updated: Apr 21, 2026
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Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
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Deep Eutectic Solvents as Designer Phase-Change Materials for Organic Rankine Cycle Applications
Johan González1, Pía Cruz1, Ricardo Hernández1
1Departamento de Tecnologías Industriales, Faculty of Engineering, Universidad de Talca, Merced 437, Curicó 3340000, Chile.
ACS Omega
|April 20, 2026
Summary
Adding a thermal energy accumulator (TEA) with novel deep eutectic solvent (DES)-based phase-change materials (PCMs) significantly boosts organic Rankine cycle (ORC) efficiency. Hydrocarbons and specific DES-PCMs show superior performance, enhancing energy utilization.
Area of Science:
- Thermodynamics and Energy Systems Engineering
- Materials Science for Energy Applications
- Renewable Energy Technologies
Background:
- Organic Rankine cycles (ORCs) are key for utilizing renewable and residual energy.
- Thermal energy accumulators (TEAs) can enhance ORC energy utilization efficiency.
- Deep eutectic solvent (DES)-based phase-change materials (PCMs) offer potential for advanced thermal storage.
Purpose of the Study:
- To analyze thermal and exergetic efficiency changes in ORCs with added TEAs.
- To evaluate novel DES-based PCMs against benchmark paraffin wax.
- To compare the performance of various working fluids (WFs) in ORC systems with TEAs.
Main Methods:
- Simulation and analysis of ORC systems incorporating TEAs.
- Experimental or computational evaluation of seven novel DES-based PCMs and paraffin wax.
- Testing with ten different working fluids, including fluorinated gases and hydrocarbons (HCs).
Main Results:
- R1233zd and n-pentane demonstrated the highest thermal and exergetic efficiencies.
- Choline chloride plus suberic acid and choline chloride plus 4-hydroxybenzoic acid were the top-performing PCMs.
- TEAs increased exergetic efficiency by up to 95%, with higher-melting-temperature PCMs being most effective.
Conclusions:
- The integration of TEAs with DES-based PCMs significantly enhances ORC performance.
- Hydrocarbons are practical working fluids for ORCs coupled with TEAs.
- PCMs with higher melting temperatures and fusion enthalpies are crucial for optimizing ORC-TEA systems.
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