1,721,074 research outputs found
Experimental evaluation of R22 and R407C evaporative heat transfer coefficients in a vapour compression plant
No full textA dimensionless numerical analysis for the optimization of an AMR cycle
No full textRefrigeration by an active magnetic regenerative system (AMR) is potentially more attractive, as compared to conventional
techniques. Indeed, devices based upon an AMR cycle are more efficient, compact, environment-friendly and can operate
over a broad range of temperatures. In this paper, attention is focused to the near room-temperature range.
On the other hand, however, the AMR cycle poses a variety of complex problems, in terms of fluid dynamics, heat transfer
and magnetic field. In order to identify the optimal operational parameters, the design and optimization of a magnetic refrigeration
system can be supported by modelling. In this paper, a dimensionless approach was adopted to simulate an AMR cycle following
a Brayton regenerative cycle. In the simulation, the temperature range that has been explored is 260 – 280 K and 275 – 295 K.
The heat transfermediums are, respectively, water–glycol mixture (50% by weight) and pure water. The Gd0.8Dy0.2 alloy and pure
Gd have been chosen as constituent material for the regenerator of the AMR cycle. With this model, the influence of the different
parameters on cycle efficiency has been analysed. In particular, the study has been focused on the influence of the secondary fluid
properties,magnetic material particle diameter, fluid blow time, secondary fluidmass flow rate, regenerator geometry and effect of
axial thermal conduction. The model enables to find optimal dimensionless numbers in order to maximize the cycle
performances. The results can be extended to widely different situations and therefore can be easily employed for the design
and the optimization of new experimental prototypes
Experimental evaluation of R22 and R407C evaporative heat transfer coefficients in a vapour compression plant
No full textA numerical analysis of an active magnetic refrigerant system with a multi-layer regenerator
No full text
A comparison of different magnetic materials in an AMR cycle in the near room temperature range
No full text
- …
