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Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Deep Eutectic Solvents Mixed with Fluorinated Refrigerants for Absorption Refrigeration: A Molecular Simulation

Rubaiyet Abedin1, Yan Shen1, John C Flake2

  • 1Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115, United States.

The Journal of Physical Chemistry. B
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This study evaluated fluorinated refrigerants mixed with deep eutectic solvents for low-temperature waste heat absorption refrigeration. The R245fa-ethaline mixture showed the highest efficiency, highlighting potential for waste heat recovery.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Chemical Engineering

Background:

  • Absorption refrigeration cycles can utilize low-grade waste heat.
  • Deep eutectic solvents (DESs) are emerging as potential working fluids.
  • Optimizing refrigerant-DES mixtures is crucial for efficient waste heat recovery.

Purpose of the Study:

  • To evaluate mixtures of fluorinated refrigerants with DESs for single-effect absorption refrigeration cycles.
  • To compute waste heat cycle efficiency using molecular simulations.
  • To compare simulation results with previous COSMO-RS predictions.

Main Methods:

  • Molecular simulations were used to determine mixture densities and Henry's law constants.
  • Phase equilibrium calculations and pure refrigerant enthalpies were incorporated.
  • Waste heat cycle efficiency was computed for various refrigerant-DES combinations.

Main Results:

  • The R245fa-ethaline mixture yielded the highest efficiency (η = 6.82).
  • Other mixtures like R245fa-levuline and HFO1336mzzE-levuline showed lower efficiencies.
  • Molecular simulations revealed strong refrigerant-DES interactions and enhanced species diffusivities.

Conclusions:

  • Refrigerant-DES mixtures show promise for low-grade waste heat utilization.
  • Further optimization of working fluids and cycle conditions can improve efficiency.
  • Discrepancies with COSMO-RS predictions necessitate further validation of simulation methods.