New Concept for High-Efficient Cooling Systems Based on Solid-State Caloric Materials as Refrigerant

Bartholomé, Kilian; Heß, Tobias; Winkler, Markus; Mahlke, Andreas; König, Jan

doi:10.1007/978-3-319-47196-9_15

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…In these conventional thermal switch based designs, the timescale of heat exchange to the fluid is fast, but the operational frequency is restricted to several Hz due to the limitation of viscous losses and large pressure drops from the fluid flow [10]. A recently-proposed heat pipe design by Bartolomé et al replaces the heat transfer fluid with an evaporation and condensation heat exchange process, and a self-transporting mechanism which avoids the need of other moving parts [11], allowing in principle much faster heat exchanger transfer rates. In this case, the rate limiting step becomes the transfer of heat from within the refrigerant to the surfaces in contact with the exchanger.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)₁₃

Lovell¹,

Bratko²,

Caplin³

et al. 2017

J. Phys. D: Appl. Phys.

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Refrigeration cycle rates of the order of 15 Hz are desirable for efficient solid state based magnetocaloric cooling, placing an upper bound on the combined magnetic transition and the heat transfer times of the order of tens of msecs. We use microcalorimetry and magnetometry to probe the transition dynamics as a function of magnetic field sweep-rate, sample size, thermal environment, temperature and hydrostatic pressure in LaFe 11.74 Mn 0.06 Si 1.20 . Although second order caloric materials follow the magnetisation or demagnetisation driving field without lag, here we show that the field driven evolution of the first-order phase transition in La(Fe,Si) 13 -based compounds show temporal dynamics on timescales that are significantly longer than tens of msecs, associated with the thermal linkage within the sample and the linkage to the external bath. We observe that features associated with the first nucleation of the transition are field sweep rate independent, and from measurements of the latent heat we infer that the barriers to magnetisation and demagnetisation are of different magnitude. Increasing the temperature or applying hydrostatic pressure reduces the dynamic effects, suggestive of diminishing first-order character of the transition under these conditions.

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Section: Introductionmentioning

confidence: 99%

Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)₁₃

Lovell¹,

Bratko²,

Caplin³

et al. 2017

J. Phys. D: Appl. Phys.

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“…The saturated steam pressure in the system leads to a linked temperature and pressure (ideal gas law with constant volume). The ethanol in the three reservoirs is tempered to 25 We developed and manufactured a check valve with which the measuring method was tested 21,22 . The check valve was developed for use in a magnetocaloric heat pump according to the specifications made in Bartholomé et al As mentioned by Bartholomé et al the magnetocaloric heat pump consist of magnetocaloric material, which is located in a heat pipe.…”

Section: Forward Directionmentioning

confidence: 99%

Method to characterize a thermal diode in saturated steam atmosphere

Maier

Heß

Kaube

et al. 2020

Review of Scientific Instruments

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We present a novel measurement method for the characterization of thermal diodes in a saturated steam atmosphere. A measuring setup has been developed in which two pressure sensors are integrated. Using a developed analytical model, the heat flow, the volume flow and the cracking pressure are determined from the measured absolute pressures and the pressure difference. The analytical model was verified using a flow through an orifice. We first calculated the volume flow through the orifice, with a diameter of 3 mm, using the Reader-Harris equation and then compared it to experimentally determined values. The experimentally values showed a discrepancy of 9%. With the measurement setup, we have characterized a check valve developed for magnetocaloric heat pumps, which has a thermally rectifying behavior. The developed check valve consists of three spring arms, which are radially attached to a valve disk. The heat flow through the check valve in forward direction is 166 W for water, 239 W for ethanol and 547 W for methanol at a temperature difference of 1 K. In the reverse direction, the heat flow is −0.03 W at a temperature difference of −1 K. For methanol, this corresponds to a rectification coefficient of more than 18,000.

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Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

378

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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New Concept for High-Efficient Cooling Systems Based on Solid-State Caloric Materials as Refrigerant

Cited by 6 publications

References 10 publications

Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)₁₃

Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)₁₃

Method to characterize a thermal diode in saturated steam atmosphere

Energy Applications of Magnetocaloric Materials

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New Concept for High-Efficient Cooling Systems Based on Solid-State Caloric Materials as Refrigerant

Cited by 6 publications

References 10 publications

Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)13

Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)13

Method to characterize a thermal diode in saturated steam atmosphere

Energy Applications of Magnetocaloric Materials

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Product

Resources

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Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)₁₃

Nucleation and dynamics of the metamagnetic transition in magnetocaloric La(Fe,Mn,Si)₁₃