Study of Magnetocaloric Cooling for Thermal Management
Abstract
Near room temperature magnetocaloric materials have attracted attention as a novel solid state thermal management technology as it has several advantages over conventional vapor compression systems. This effort is an investigation of the basic science of magnetocaloric materials wherein Fe, Co-based and Heusler alloys were used as replacements for gadolinium alloys. Findings from differential scanning calorimetry (DSC) and vibrating sample magnetometry (VSM) of Co substituted Ni-Mn-Sn Heusler melt spun ribbons show that the martensitic transition temperatures of Ni-Co-Mn-Sn decreased with increasing Co content. Co substitution resulted in a decrease in martensitic transition temperature by 25K per at. %Co. The magnetocaloric effect (MCE) in Fe80-x B12Cr8REx (RE=La, Ce or Gd, x = 1-15%) alloys was also investigated. RE additions could be used to tune the Curie temperature (TC); TC could be adjusted near room temperature with relatively constant peak magnetic entropy change for Fe-B-Cr-Ce amorphous alloys. Construction of a magnetic cooling system was done which possessed an active magnetic double regenerator cycle (AM2RC) and control subsystems. An active transient cooling system was also developed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 12, 2012
- Accession Number
- ADA570171
Entities
People
- E. V. Sampathkumaran
- G. Ramanath
- P. Keblinski
- Raju V. Ramanujan
Organizations
- Nanyang Technological University