Liquid-state dipolarcaloric refrigeration cycle with nitrate-based salts

Area of Science:

• Materials Science
• Thermodynamics
• Environmental Science

Background:

• Vapor compression refrigeration poses environmental challenges.
• Existing solid-state caloric refrigeration has limitations in performance and scalability.
• Need for efficient and sustainable cooling technologies.

Purpose of the Study:

• Introduce a liquid-phase dipolarcaloric refrigeration cycle.
• Demonstrate its potential as an environmentally responsible alternative.
• Identify suitable materials and validate the cycle experimentally.

Main Methods:

• Utilized endothermic dissolution of nitrate-based salts.
• Regenerated salts via electrodialysis.
• Conducted experimental validation supported by thermodynamic modeling.

Main Results:

• Achieved significant adiabatic temperature changes and high coefficients of performance.
• Identified effective saltwater pairs: ammonium nitrate for refrigeration, potassium nitrate for air conditioning.
• Demonstrated efficient heat transfer and scalability due to the fluidic nature.

Conclusions:

• Dipolarcaloric cooling is a viable, environmentally responsible refrigeration alternative.
• The cycle uses abundant, low-cost materials.
• The fluidic system ensures efficient heat transfer and scalability.