Dynamic electromagnonic crystal based on artificial multiferroic heterostructure

Abstract One of the main challenges for the modern magnonics, which, as opposed to the conventional electronics, operates with quanta of spin waves in magnetically ordered materials—magnons—is energy efficient control of magnon transport on small time and space scales. The magnon propagation in a time-dependent periodic spatial potentials—dynamic magnonic crystals—paves a way to this aim. To date, dynamic manipulation of the magnonic crystals has been realized with electric current and optic control influence. However, both approaches show limited potential for reduction in energy consumption and miniaturization of magnonic circuits. Voltage (or electric field) control of magnon currents promises to be fast and low energy consuming. It can be achieved in ferrite-ferroelectric (multiferroic) heterostructures, where strong coupling of magnons and microwave photons constitutes new quasiparticles called electromagnons. Here, we present an experimental realization of a voltage-controlled dynamic electromagnonic crystal operating with electromagnons at microwave frequencies.

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Energy Efficient Control of the Dehumidification Process in Heat Exchangers with Air Bypass

E3S Web of Conferences ◽

10.1051/e3sconf/201911104035 ◽

2019 ◽

Vol 111 ◽

pp. 04035 ◽

Cited By ~ 1

Author(s):

Stephan Kusche ◽

André Badura

Keyword(s):

Heat Exchanger ◽

State Space ◽

Heat Exchangers ◽

Basic Concept ◽

Energy Efficient ◽

Reduction Method ◽

Krylov Space ◽

Air Stream ◽

Efficient Control ◽

Energy Consuming

This paper deals with an energy efficient approach for the dehumidification process of supply air. The basic concept consists of an air bypass, which separates the airstream. Later the unprocessed air is mixed with the conditioned air. This mixing allows one to avoid the energy consuming reheating of the air stream. Application of this concept demands for a sophisticated controller. In this case a state space controller is designed. Therefore, the underlying model for the heat exchanger is derived and a Krylov Space based reduction method is applied. This model is broadened for the bypass. The overall linear model is derived via numerical linearization.

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Identification and energy efficient control for a building: Getting inspired by MPC

2015 American Control Conference (ACC) ◽

10.1109/acc.2015.7170973 ◽

2015 ◽

Cited By ~ 2

Author(s):

Eva Zacekova ◽

Matej Pcolka ◽

Jaroslav Tabacek ◽

Jiri Tezky ◽

Rush Robinett ◽

...

Keyword(s):

Energy Efficient ◽

Efficient Control

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Energy efficient control techniques in continuous cooking application

IFAC Proceedings Volumes ◽

10.3182/20100329-3-pt-3006.00054 ◽

2010 ◽

Vol 43 (1) ◽

pp. 297-302 ◽

Cited By ~ 1

Author(s):

Timo Ahvenlampi ◽

Timo Malmi ◽

Mervi Liedes ◽

Enso Ikonen

Keyword(s):

Energy Efficient ◽

Control Techniques ◽

Efficient Control

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Research of the energy efficiency of a combined air and water heating of a public building

Safety and Reliability of Power Industry ◽

10.24223/1999-5555-2021-14-2-124-131 ◽

2021 ◽

Vol 14 (2) ◽

pp. 124-131

Author(s):

K. A. Ignatiev ◽

E. R. Giniyatullin ◽

M. G. Ziganshin

Keyword(s):

Energy Efficiency ◽

Indoor Air ◽

Energy Efficient ◽

Heating System ◽

Temperate Climate ◽

Water Heating ◽

Efficient Control ◽

Temperature And Humidity ◽

Academic Building ◽

Continental Climate

Combined air and water heating schemes have been actively used recently for heating public and residential premises. They have certain advantages in countries with a warm climate, whereas in a temperate climate, their use may be unfeasible. The most effective regulation of the heating system in the building can be expected, if all the technology specifics are taken into account, in terms of both the purpose of the room and the methods of regulation. A system focused only on weather-based regulation falls short of meeting to energy-efficient control classes: a heat carrier with the same temperature is distributed among rooms with different requirements for temperature and humidity characteristics. The issues of ensuring the energy efficiency of the combined air and water heating system in public buildings for the temperate continental climate of Russia — the academic building (AB) and laboratory building (LB) of the Kazan State Energy University (KSEU) have been considered. Heating devices of the KSEU heating system have manual control valves installed in the premises, or radiator valves with thermostatic heads, but without room controllers, which does not meet the energy-efficient control classes. An experimental survey of the functioning of the heating system of the KSEU buildings during the 2019 – 2020 and 2020 – 2021 heating seasons was conducted. The optical pyrometry method was used to measure the temperature of the surfaces of windows, walls and elements of the heating system, as well as the temperature and humidity of the air in lecture rooms and corridors of the AB and LB of the KSEU. The parameters of heating devices and indoor air in rooms of various purposes were found compliant with the current sanitary and hygienic requirements. At the same time, the need to switch to a higher class of regulation has been revealed, since, under the current situation, the parameters of the indoor air depend on the outdoor temperature: in the abnormally warm winter of 2020, the indoor air temperature was at the edge of the maximum permissible value, while in the normal climate of winter of 2021, it was at the edge of the minimum permissible value.

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