  The design of a Double Inlet Pulse Tube Refrigerator is investigated by means
of an analogy with an electric circuit. The results obtained with the electric
scheme are compared with both those of the thermodynamic model (Part A) and
experiments. The basic formulation of equivalent electronic components is
discussed and a few improvements are proposed to adjust the theoretical
expressions of the electrical impedances of capillaries and regenerator in
order to consider additional effects such pressure drops due to geometrical
singularities at different internal flow regimes. A simplified formulation for
the regenerator inefficiency is deduced from considerations on its harmonic
functioning. The main purpose of this analysis considers especially the design
of miniature cryocoolers dedicated to electronic applications. These models are
applied to a commercial miniature refrigerator. A discussion of their relevance
is achieved and a few suggestions on the refrigerator design are proposed to
improve the cooling production.
