A full solid-state conceptual magnetocaloric refrigerator based on hybrid regeneration

Area of Science:

• Materials Science
• Thermodynamics
• Refrigeration Technology

Background:

• Magnetocaloric refrigeration offers an eco-friendly alternative to traditional vapor compression systems.
• Conventional regenerators (PMRs, AMRs) suffer efficiency losses due to heat transfer fluid limitations, especially at high frequencies.
• These losses stem from dead volume, pressure drops, and non-uniform temperatures within the heat transfer substances.

Purpose of the Study:

• To introduce a novel hybrid magnetic regenerator (HMR) design for improved magnetocaloric refrigeration.
• To enable both high thermal conductivity materials (HTCMs) and magnetocaloric materials (MCMs) to actively participate in the regeneration process.
• To reduce regeneration losses and enhance refrigeration performance at high operating frequencies.

Main Methods:

• Development of a conceptual hybrid magnetic regenerator (HMR) integrating solid-state HTCMs and MCMs.
• Utilizing experimentally derived adiabatic temperature changes and magnetic work data.
• Employing finite element simulations to model the HMR's performance.

Main Results:

• The HMR design significantly reduces regeneration losses associated with dead volume, pressure, and temperature non-uniformity.
• Achieved a maximum temperature span of 26 K.
• Demonstrated a high cooling power of 8.3 kW/kg at 10 Hz.
• Attained a maximum ideal exergy efficiency of 54.2%.

Conclusions:

• The proposed HMR design offers a promising pathway to overcome limitations of current passive and active magnetic regenerators.
• This integrated approach shows potential for achieving superior, advanced performance in magnetocaloric refrigerators.
• The HMR concept could lead to more efficient and environmentally friendly cooling technologies.