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An experimental study on performance of Li-Fe-Co-Si active magnetic regenerator for room temperature cooling applications.

Number: 2405

Author(s) : SINGH P., SRIKANTI K., CHANDRA M., GOPALAN R., SESHADRI S.

Summary

The need to shift towards environmentally benign cooling technologies has increased due to nearly 8% of global greenhouse gas emissions coming from conventional refrigeration systems based on vapor compression technology. The existing vapor compression-based cooling technology is mature in many aspects, but it has adverse environmental impacts. A magnetic refrigeration system (MRS) is emerging as one of the best alternatives to conventional refrigeration systems due to its negligible ozone depletion potential and low global warming potential. Magnetocaloric materials (MCM) are the core component of this technology due to their property to become hot on magnetization and cold when demagnetized. The magnetic refrigeration system is analogous to the conventional vapor compression refrigeration system. The heating and cooling on demagnetization of solid refrigerant MCM are like compression and expansion of gas refrigerants. Many compounds are classified as MCM, among which the La-Fe-Co-Si group of MCM is earth abundant and works near ambient temperatures (15 – 25 °C). The second component of MRS is the magnet, and for this study, we chose the nested Halbach magnet array (1.5 T). We selected the combshaped geometry of La-Fe-Co-Si MCM with an area-to-volume ratio of 4.5 for efficient heat transfer. La-Fe-Co-Si group of MCM contains Fe, making it prone to corrosion, limiting our choice of heat transfer fluids to non-aqueous. A hydrocarbon heat transfer fluid was thus used to evaluate the MCM array's performance in this study. A slotted tray consisting of MCM blocks inside a cylindrical tube and heat transfer fluid forms the Active Magnetic Regenerator (AMR). MCM blocks are cascaded in AMR cylinder with respective curie temperatures (in °C) in the following order 10.9, 12.9, 14.9, 16.9, 18.9, 20.9, 24.9, and 26.9. A reciprocating system is chosen for this configuration to reduce power consumption. From our observations, 10 watts of refrigeration capacity is achievable with this configuration. For the frequency range of 2.8mHz and 75mHz, the temperature span achieved is nearly 0.85K for 0.5 lit/min of HTF flow rate. The specific refrigeration capacity was 6.29K/kg of solid refrigerant La-Fe-Co-Si MCM. The cooling capacity and temperature span of MRS were dependent on the rate of change of magnetic flux across the MCM affected by moving it in and out of the magnetic field and on the response time for heat transfer. The study helped to optimize the heat transfer in AMR by tuning of frequency and flow rate for this system.

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  • Original title: An experimental study on performance of Li-Fe-Co-Si active magnetic regenerator for room temperature cooling applications.
  • Record ID : 30030714
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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