Abstract
Active magnetic regenerators need magnetocaloric materials of sufficient size, shape, and quantity to create a matrix for characterization in a test apparatus. Limited availability of novel magnetocaloric materials in a suitable form leads to regenerator beds which are smaller than desired. When implemented in a test apparatus, result in unwanted loss mechanisms such as void spaces between the regenerator and heat exchangers. The loss of cooling power due to dead volume losses and thermal interactions with the ambient environment when using small regenerators is investigated with experimental and 1D numerical methods. Due to uncertainty regarding the casing thermal state, a range of cases for casing temperature are numerically tested including: a fixed temperature and a linear temperature profile from hot to cold end using the simulation boundary conditions. Including dead volume sections improves simulation results while casing heat leaks impact simulations with a net cooling power up to 2.5 W.
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