Influence of inlet flow maldistribution and carryover losses on the performance of thermal regenerators

Trevizoli, Paulo V.; Peixer, Guilherme Fidelis; Nakashima, Alan T.D.; Capovilla, Matheus S.; Lozano, Jaime; Barbosa, Jader R.

doi:10.1016/j.applthermaleng.2018.01.055

Cited by 23 publications

(8 citation statements)

References 32 publications

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“…Extensive reviews of the developed machines are given in Kitanovski et al (2015) and Balli et al (2017). Recently it was demonstrated numerically and experimentally that maldistribution of heat transfer fluid through regenerator beds leads to severe reduction of the machine performance (Eriksen et al, 2016;Nakashima et al, 2018;Trevizoli et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Nature—Inspired Flow Patterns for Active Magnetic Regenerators Assessed Using a 1D AMR Model

Navickaitė

Bahl

2019

Front. Energy Res.

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A novel flow structure of a solid active magnetic regenerator is proposed in this paper. The numerical performances of two nature-inspired flow geometries, based on double corrugated tubes with an elliptical cross-section, are compared to the performance of conventional flow structures for Active Magnetic Regeneration (AMR) applications, namely, packed spheres and a cylindrical micro-channel matrix. The numerical performance of all the geometries is analyzed in terms of cooling power and coefficient of performance. Regenerators with various porosities and two different hydraulic diameters of the flow channels are evaluated varying utilization at fixed temperature spans between the hot and cold reservoirs. The selection of the regenerator geometry is based on two actual AMR machines. The numerical results demonstrate that a suitably optimized AMR geometry with a double corrugated flow pattern provides the same or higher efficiency at higher porosity compared to conventional AMR flow geometries. These findings suggest that the magnetocaloric material used to construct AMR beds can be exploited more efficiently and at a lower investment cost of an AMR device when suitable double corrugated flow pattern is used.

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Section: Introductionmentioning

confidence: 99%

Nature—Inspired Flow Patterns for Active Magnetic Regenerators Assessed Using a 1D AMR Model

Navickaitė

Bahl

2019

Front. Energy Res.

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“…Improving the ambient temperature control or improving the thermal isolation of the apparatus would benefit experiments using small regenerators with dead volumes. The void spaces outside the regenerator can be reduced by using small capillary tubing, glass spheres and check valves; however, small dead volume can impede performance due to flow maldistribution as shown elsewhere [75]. Design choices for optimizing structure of AMR devices warrant further study.…”

Section: Resultsmentioning

confidence: 99%

A concise approach for building the $s-T$ diagram for Mn–Fe–P–Si hysteretic magnetocaloric material

Christiaanse¹,

Campbell²,

Trevizoli³

et al. 2017

J. Phys. D: Appl. Phys.

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The objective of this work is to assess the potential of Mn-Fe-SiP for magnetic heat pump applications. Mn-Fe-SiP is a first order transition magnetocaloric material made from safe and abundantly available constituents. A significant magnetocaloric effect occurs at the transition temperature of the material. The transition temperature can be tuned by changing the atom ratios to a region near room temperature. Mn-Fe-SiP in magnetic heat pumps is investigated by determining the material's properties, 1D system modeling and experiments in a magnetic heat pump prototype. We characterize six samples of Mn-Fe-SiP , based on their heat capacity and magnetization. The reversible component of the adiabatic temperature change is found from the entropy diagram and compared to cyclic adiabatic temperature change measurements. Five of the six samples are selected to be formed into epoxy fixed crushed particulate beds, which can be installed into a magnetic heat pump prototype.

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“…This problem is that of the well‐known flow through porous or channeled bodies, or in the field of heat exchangers . This important issue was thoroughly investigated by other researchers . One of the last and most interesting studies on the subject was conducted by Navickaite et al, who investigated the possibility of improving the geometry of an active magnetic regenerator using double corrugated tubes.…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

359

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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Influence of inlet flow maldistribution and carryover losses on the performance of thermal regenerators

Cited by 23 publications

References 32 publications

Nature—Inspired Flow Patterns for Active Magnetic Regenerators Assessed Using a 1D AMR Model

Nature—Inspired Flow Patterns for Active Magnetic Regenerators Assessed Using a 1D AMR Model

A concise approach for building the $s-T$ diagram for Mn–Fe–P–Si hysteretic magnetocaloric material

Energy Applications of Magnetocaloric Materials

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