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A magnetically-activated thermal switch without moving parts
- Source :
- Energy Conversion and Management. 197:111881
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- With the ever increasing power dissipation in electrical devices, new thermal management solutions are in high demand to maintain an optimal operating temperature and efficient performance. In particular, recently developed magnetically-activated thermal switches (MATSs) provide an alternative to existing devices, using the magnetic and thermal properties of superparamagnetic nanofluids to dissipate heat in a controlled manner. However, the presence of moving parts is a major drawback in these systems that must still be addressed. Herein, we present a compact and automatized MATS composed by an encapsulated superparamagnetic nanofluid and an electromagnet allowing to activate the MATS without any moving part. We investigate the effect of different temperature gradients ( 10 , 26 and 40 °C) and powers applied to the coil (6.5, 15, 25 and 39 W) on the performance of this novel MATS. The results show that the highest ( 44.4 % ) and fastest ( 0.6 °C/s) temperature variation occur for the highest studied temperature gradient. On the other hand, with increasing power, there is also an increase in the efficiency of the heat exchange process between the two surfaces. These results remove one of the main barriers preventing the actual application of magnetic thermal switches and opens new venues for the design of efficient thermal management devices.
- Subjects :
- Materials science
Electromagnet
Renewable Energy, Sustainability and the Environment
business.industry
020209 energy
Energy Engineering and Power Technology
02 engineering and technology
Dissipation
law.invention
Temperature gradient
Fuel Technology
Nanofluid
020401 chemical engineering
Nuclear Energy and Engineering
Operating temperature
law
Electromagnetic coil
Heat exchanger
Thermal
0202 electrical engineering, electronic engineering, information engineering
Optoelectronics
0204 chemical engineering
business
Subjects
Details
- ISSN :
- 01968904
- Volume :
- 197
- Database :
- OpenAIRE
- Journal :
- Energy Conversion and Management
- Accession number :
- edsair.doi...........a4fa397d78d9f4a3f0a5f21740dd9a8c
- Full Text :
- https://doi.org/10.1016/j.enconman.2019.111881