Design and performance study of the active magnetic refrigerator for room-temperature application

Zheng, Zhigang; Yu, Hong; Zhong, Xi; Zeng, D.C.; Liu, Zhongwu

doi:10.1016/j.ijrefrig.2008.06.004

Cited by 51 publications

(17 citation statements)

References 15 publications

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“…approximately no net temperature span). Zheng et al (2009) describe the design and theory behind the operation of a permanent magnet AMR using gadolinium as the refrigerant (Zheng et al, 2009). No experimental results are provided, but they present calculated COP values taking into account cycle irreversibilities that produce additional thermal load.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of a two-material active magnetic regenerator

Arnold

Tura

Rowe

2011

International Journal of Refrigeration

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Section: Introductionmentioning

confidence: 99%

Experimental analysis of a two-material active magnetic regenerator

Arnold

Tura

Rowe

2011

International Journal of Refrigeration

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“…This type requires at least two regenerators to which the fluid flow can be controlled. The modulating type of device can either be of the reciprocating type (Zheng et al, 2009) or of the rotary type (Okamura et al, 2006). As the flow in the heat exchange circuit is unidirectional in the continuous type of device, an advantage is that the heat exchangers are not constrained to be directly adjacent to the regenerators, but can be placed some distance from them.…”

Section: Classification Of Devicesmentioning

confidence: 99%

Development and experimental results from a 1 kW prototype AMR

Bahl

Engelbrecht

Eriksen

et al. 2014

International Journal of Refrigeration

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A novel rotary magnetic refrigeration device has been designed and constructed following the concepts recently outlined in Bahl et al. (2011). The magnet and flow system design allow for almost continuous usage of both the magnetic field and the magnetocaloric material in 24 cassettes, each containing an active magnetic regenerator (AMR) bed. As outlined in Pryds et al. (2009) a small scale AMR test device has been used for materials choice and optimising operation, with each component being thoroughly characterised and tested before implementation. The prototype design facilitates easy exchange of the 24 cassettes, allowing the testing of different material amounts and compositions. Operating with 2.8 kg of commercial grade Gd spheres a maximum no-span cooling power of 1010 W and a maximum zero load temperature span of 25.4 K have been achieved. For the purpose of actual operation, simultaneous high span and high performance is required. At a heat load of 200 W a high temperature span of 18.9 K has been obtained, dropping to a span of 13.8 K at the higher heat load value of 400 W.

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“…The fifth Chinese reciprocating prototype was developed by the South China University of Technology in 2009 and was presented by Zheng et al [21]. The design of the device was similar to that of Huang et al [19].…”

Section: Chinese Prototypesmentioning

confidence: 99%

Overview of Existing Magnetocaloric Prototype Devices

Kitanovski

Tušek

Tomc

et al. 2014

Magnetocaloric Energy Conversion

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Since Brown [1] built the first magnetic refrigerator prototype working near room temperature in 1976 there has been a large number of different prototypes [2] designed and built over the past 40 years. However, despite there being 4 decades of scientific input into the field of magnetocaloric energy conversion near room temperature, the technology is only now at the brink of commercialization. With every new prototype that is built, we see slow but measureable improvements toward the desired goal. Figure 7.1 shows the number of prototypes built until 2014. It is clear that the number of prototypes increases with each new year, pointing to the fact that the magnetocaloric energy conversion research community is expanding research activities together with the S-curve of technology development.The reasons why magnetocaloric technology near room temperature is only now slowly becoming market-ready lie in the fact that there are a number of different obstacles regarding the device's design, which need to be overcome before finalizing the idea of commercializing magnetocaloric technology. Addressing all the design issues is, of course, a difficult task. With each prototype built researchers try to solve different design issues, ranging from the heat-transfer problems of the AMRs and the working fluids, the design issues of the AMRs and magnet assemblies, to the problems related to peripheral elements, such as pump and valves systems. In this manner, each prototype built up until now has its own special feature. Each of them is trying to address one or more of the engineering barriers, but almost never a system as a whole.However, there is one major characteristic that can be distinguished for all the existing prototypes. There are two groups of devices, i.e. the ones operating in a reciprocating (linear motion) manner and the others operating in a rotary manner. The reciprocating and rotary operations of the magnetocaloric device are more or less related to the way how the AMR is exposed to the alternating magnetic field, as is described in Chap. 4 on Active Magnetic Regeneration (see also Chap. 8). One possibility is to move the AMR or the magnet in a reciprocal direction back and forth, and the other is to rotate the AMR or the magnet. As you will see in the following sections, each of the two methods has its pros and cons, depending on the functionality of the device. Is it an experimental testing device? Or is it a real

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Design and performance study of the active magnetic refrigerator for room-temperature application

Cited by 51 publications

References 15 publications

Experimental analysis of a two-material active magnetic regenerator

Experimental analysis of a two-material active magnetic regenerator

Development and experimental results from a 1 kW prototype AMR

Overview of Existing Magnetocaloric Prototype Devices

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