thermodynamics of cores.2nd law breach?

[picowatt]

@milehigh,true.let me give another analogy.evrybody knows that if you take a permanent magnet and heat it,it loses magnetic strength.the opposite is also true thus if you cool a permanent magnet the domains fall into more orderly alignment and magnetic strength increases.thus in our inductor the aligned domains order suddenly increase at moment of cooling,thus magnetic field strength increases,thus back-inductance is stronger than forward-inductance.additional heat intake is now required to re-randomize those domains to original state due to this increased shifting alignment of domains.its a sinkhole for ambient heat.

How are you performing this "cooling"?

PW

[profitis]

@pw..the battery energy performs the cooling.the ambient energy plus the expelled battery energy performs the return to equilibrium.

[picowatt]

@pw..the battery energy performs the cooling.the ambient energy plus the expelled battery energy performs the return to equilibrium.

The battery energy produces heating.

In modern prototypes, electromagnets have been replaced with permanent magnets and the MC material is just moved into or out of the permanent magnetic field (or the magnets themselves moved).

In either case, application of a magnetic field to a magnetocaloric material liberates heat, i.e., increases its temperature.

PW

[profitis]

no picowatt,picture the magnetic domains in our inductor core as a type of elastic band.the battery heats up our elastic during stretching,heat dissipates to environment,then when we cut battery power off the rubber band snaps,instantly cooling the entire band,and the energy collected on our kickback load.im saying that the moment it cools we collect extra potential energy from sudden strengthening of rubber molecules.some ambient heat being added to stored battery energy(in the stretchd band)on collision with our fingers(ouch)

[picowatt]

no picowatt,picture the magnetic domains in our inductor core as a type of elastic band.the battery heats up our elastic during stretching,heat dissipates to environment,then when we cut battery power off the rubber band snaps,instantly cooling the entire band,and the energy collected on our kickback load.im saying that the moment it cools we collect extra potential energy from sudden strengthening of rubber molecules.some ambient heat being added to stored battery energy(in the stretchd band)on collision with our fingers(ouch)

This is exactly what I said, application of a magnetic field to a magnetocaloric material liberates heat, i.e., increases the material's temperature.

To produce cooling, the heat generated during the application of the magnetic field must be removed while the magnetic field remains in place (using liquid or air cooling for example).

When the magnetic field is then removed, the equivalent amount of heat removed while the material remained magnetized is absorbed by the material (assuming 100% efficiency).

The process is very analogous to most every other refrigeration cycle such as compressing a gas, which raises its temperature, extracting heat using air or liquid cooling, and then releasing the pressure on the gas so that it absorbs the heat that was extracted from it while pressurized.

Basic heat pump action, but not 100% efficient.

PW