The Cryofuel Systems Group (CFS) is working towards the development of refuelling systems for the distribution of both compressed and liquified natural gas to vehicles. A key component of the refuelling station is the liquefier. CFS has identified magnetic refrigeration as having the potential to provide a high efficiency, low cost liquefier. For an efficient liquefier, a highly effective regenerator is necessary. A regenerator consists of a matrix of porous material that acts as a thermal storage device. Heat is transferred to and from the solid by the fluid in one cycle of operation. Any ineffectiveness in the regenerator seriously impacts the cooling power of the liquefier.

This thesis describes the development of three different regenerator beds constructed using spheres, flakes and wires respectively. A computer model developed to simulate regenerator performance is also discussed. Finally, the details of a differential test apparatus used to characterize the performance of the three regenerators are presented.