Analyzing the energetic performances of AMR regenerator working with different magnetocaloric materials: Investigations and viewpoints

Aprea, Ciro; Greco, Adriana; Maiorino, Angelo; Masselli, Claudia

doi:10.18280/ijht.35sp0152

Cited by 31 publications

(18 citation statements)

References 22 publications

(28 reference statements)

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“…The behavior of a caloric heat pump is described through a 2-D model, already introduced [18,19] and validated [20][21][22] in previous investigations. The geometry of the heat pump sees a parallel-plate regenerator made of caloric material, separated by channels in which the Heat Transfer Fluid (HTF) crosses the regenerator.…”

Section: Modelling Active Caloric Regenerative Heat Pumpsmentioning

confidence: 76%

Nanofluids as Heat Transfer Fluids for High-efficiency Caloric Heat Pumps

Greco¹,

Aprea²,

Maiorino³

et al. 2019

IJES

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Solid-state is the new frontier of Not-In-Kind technologies arisen as possible future replacement of vapor-compression-based systems. Caloric cooling and heat-pumping found their operation on caloric effect; a class of thermo-physical effects detected in caloric materials following an adiabatic change of the intensity of an applied external field, that results in a variation of the temperature in the material itself. A Brayton-based thermodynamical cycle, called Active Caloric Regenerative cycle, is used to build caloric cooling systems or heat-pumps. In ACR cycle the caloric material acts both as refrigerant and as regenerator and an auxiliary Heat-Transfer Fluid (HTF) is employed to vehiculate heat fluxes between the cold and hot environments. The most common HTF is water but advanced solutions could be adopted to enhance the heat exchange coefficients, like nanofluids. Nanofluids are suspensions consisting of solid high-thermal-conductivity nanoparticles dispersed in a base fluid to enhance the global thermal conductivity of the fluid. In this paper we investigate, numerically, the energy performances of a caloric heat pump employing water-based Al2O3 nanofluids as HTF. The analysis is perpetuated changing both the nanofluid volume concentrations and the caloric materials employing electrocaloric, elastocaloric and barocaloric ones.

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Section: Modelling Active Caloric Regenerative Heat Pumpsmentioning

confidence: 76%

Nanofluids as Heat Transfer Fluids for High-efficiency Caloric Heat Pumps

Greco¹,

Aprea²,

Maiorino³

et al. 2019

IJES

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“…The 2-D tool modelling the AMR refrigerator was already introduced [18][19] and validated [20][21][22] in previous investigations. Following are reported briefly the key points, mandatory to understand how it works.…”

Section: The 2-d Modelmentioning

confidence: 94%

On the Utilization of Nanofluids as Secondary Fluid for Heat Transfer in a Magnetocaloric Cooler

Greco¹,

Aprea²,

Maiorino³

et al. 2019

TI-IJES

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Magnetocaloric refrigeration is based on solid-state refrigerants exhibiting magnetocaloric effect, detected in a temperature change of the materials due to the adiabatic variation of the intensity of a magnetic field applied to it. Magnetocaloric refrigeration could represent potentially an alternative to vapor compression since the former is more environmentallyfriendly. The reference thermodynamical cycle is AMR cycle, applied to a solid-state structure made by the magnetocaloric material, placed between a cold and a hot heat exchanger and subjected to alternative magnetization/demagnetization cycles. To vehiculate the fluxes between cold and hot heat exchangers, a heat-transfer fluid is used: it usually is water or a water-ethylene mixture for sub-zero applications, but innovative solutions could be adopted, such as nanofluids in order to enhance the thermal conductivity of the resulting fluid. In this paper we report the results of an investigation conducted on a parallel-plate AMR refrigerator, employing nanofluids (Al2O3 and CuO) as heat-transfer medium. The analysis was perpetuated changing both the nanofluid volume concentration and the magnetocaloric material. The results are reported in terms of cooling power and coefficients-of-performance and we detect that the effect of using a waterbased nanofluid is always positive in terms of the energy performances of the AMR refrigerator.

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“…Magnetic materials are nowadays used in many applications [55,56]: among them the most commons are as refrigerants of solid-state magnetic refrigeration [57][58][59] and to increase the efficiency of the electric motors. One of the ways to increase electric motor efficiency is achieved by replacing traditional methods by Soft Magnetic Composite (SMC) or iron powder materials.…”

Section: Magnetic Materialsmentioning

confidence: 99%

A Review on Methods to Reduce Weight and to Increase Efficiency of Electric Motors Using Lightweight Materials, Novel Manufacturing Processes, Magnetic Materials and Cooling Methods

Solomon¹,

Greco²,

Masselli³

et al. 2020

ACSM

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The electric motor is the mechanism that transforms electrical energy into mechanical energy. Nowadays, electric motors are the cause of a considerable share of the use of electricity and therefore of the energy consumptions (70% in the industrial sector and 25-30% in the tertiary sector). Faced with ever-increasing energy demand and with a view to adhering to the all-over-the world imperative of adopting measures to reduce energy consumption in all the involved sectors, the use of efficiency enhanced electric motors is required. Generally, the efficiency of an electric motor depends on the type of motor, the size of the motor, the utilization factor, but also on the quality and quantity of the materials employed. Therefore, from all these aspects the need of using energy and costefficient components for developing electric motors arises. This review paper aims to draw a general framework on the methods of increasing efficiency and of reducing weight of the electric motors.

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Analyzing the energetic performances of AMR regenerator working with different magnetocaloric materials: Investigations and viewpoints

Cited by 31 publications

References 22 publications

Nanofluids as Heat Transfer Fluids for High-efficiency Caloric Heat Pumps

Nanofluids as Heat Transfer Fluids for High-efficiency Caloric Heat Pumps

On the Utilization of Nanofluids as Secondary Fluid for Heat Transfer in a Magnetocaloric Cooler

A Review on Methods to Reduce Weight and to Increase Efficiency of Electric Motors Using Lightweight Materials, Novel Manufacturing Processes, Magnetic Materials and Cooling Methods

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