  Thermoacoustic Refrigerators (TARs) use acoustic power to generate cold
temperatures. Apart from the operating frequency and the mean temperature of
the working medium, the charging pressure and the dynamic pressure in the TAR
govern its attainable cold temperature. The effect of charging pressure on the
dynamic pressure in a loudspeaker driven gas filled standing wave column has
been well understood. The present work aims to investigate the effect of
charging pressure on the cold end temperature of a standing wave TAR. The cold
end temperature lift and the cooldown for several changing pressures are
reported. The effect of vacuum around the cold end on the TAR performance is
also presented.
