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New power electronics for solid-fuel heat pumps with 97.4% efficiency – pv magazine International

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Germany’s Fraunhofer Institute for Utilized Strong State Physics (IAF) has developed an ultra-efficient circuit topology for voltage converters with {an electrical} effectivity of 99.74%. The expertise can enhance the coefficient of efficiency for electrocaloric warmth pumps and scientists at the moment are contemplating elements primarily based on the semiconductor gallium nitride (GaN) for greater energy density and effectivity.

From pv journal Germany

The IAF has developed particular energy electronics for electrocaloric warmth pumps to extend their electrical effectivity.

With the electrocaloric impact, electrical voltage is utilized to an electrocaloric materials manufactured from particular ceramics or polymers, and the fabric heats up. When the stress is eliminated, the fabric cools once more, making the entire course of practically reversible.

IAF scientists declare to have developed an ultra-efficient circuit topology for voltage converters with {an electrical} effectivity of 99.74%. Warmth pumps are presently restricted to about 50% of Carnot’s bodily restrict as a result of expertise, however electrocaloric warmth pumps can theoretically attain 85%.

These solid-fuel warmth pumps can be delivered to the market as an alternative choice to the bases of present compressor expertise, since they promise better effectivity and don’t require refrigerants.

Scientists are presently researching elements primarily based on the semiconductor gallium nitride (GaN) for greater energy density and effectivity. They succeeded in growing an ultra-efficient circuit topology for voltage converters primarily based on GaN transistors, with {an electrical} effectivity of 99.74%. The GaN-based multilevel DC/DC converter is way from the present state of analysis which is lower than 90% recharging effectivity for {the electrical} management of this new warmth pump.

The development within the effectivity of the facility electronics additionally has a direct impact on the efficiency of the whole system, straight resulting in a better coefficient of efficiency for the whole warmth pump system. Nonetheless, there may be nonetheless quite a lot of analysis to be completed to make the solid-fuel warmth pump a extra environment friendly and utterly emission-free answer for heating and cooling.

“Vital for the conclusion of a excessive coefficient of efficiency of the electrocaloric warmth pump is a really excessive effectivity of the supplies, the electronics and the warmth switch,” stated Kilian Bartholomé, supervisor of the ElKaWe undertaking. “When you can management every little thing, electrocaloric expertise has nice potential.”

Six Fraunhofer institutes are concerned within the ElKaWe undertaking. They revealed their ends in IEEE Journal of Rising and Chosen Subjects in Energy Electronics.

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