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Table 2 Advantages and limitations of different cooling methods

From: Approaches in cooling of resistive coil-based low-field Magnetic Resonance Imaging (MRI) systems for application in low resource settings

Cooling Method Advantages Limitations
Conduction • Good with low current density systems.
• No moving parts required.
• Can be coupled with convective cooling methods.
• There is a limit to how much heat transfer material is to be used.
• Not suitable for high current density values.
• Significant increase in system weight if more heat conductive material is added.
• Eddy currents in case of excess material [42] and from changing fields
Air cooling • Cooling medium is readily available.
• Can easily be coupled with conductive cooling and indirect liquid cooling.
• Dry method hence no fear of shocks from leakage.
• Limited to current densities of 2 A/mm2.
• Low coefficient of heat transfer (between 2.5–10 (natural convection) 10–500 W/m2K (forced convection) [64]).
• Often bulky with high space requirements.
Liquid cooling • Relatively high coefficient of heat transfer (100–15,000 W/m2K [64])
• Compact design is possible hence lower space requirements.
• No thermal barriers when direct cooling through hollow conductors is used
• Possible electric shocks in case of leakages
• Corrosion of cooling channels due to high flow rate and pressure requirements
• Additional power and operational costs from pumping