shows the
scheme of the TES unit studied. They concluded that the transient
thermal responses in the composite improve as the diameter of the
brush increases until the diameter of the brush is larger than the
distance between the tubes, then it shows no increase. They found
out that the effective thermal conductivity, including the effect of
the thermal resistance of the composite is about three times as
large as that of PCM when the volume ratio of brush fibers to the
diameter of the tube pitch is 0.012.