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At
partial load conditions, the working points of the compressors
and expander change depending on the inlet temperatures
and pressures, which come from the temperatures of both
outside and inside the warehouse. Since
the system is based on a multistage design, the expander
and 2nd stage compressor are independent of the motor
speed and driven freely, so they have a wide range of
flexibility.
In addition, using 2 stages compression opens up the
system to utilize various driving devices for the 1st
stage compressor.
From
an efficiency point of view, the two stage compression
and inter-cooling forms a near reverse Ericsson cycle
which has higher efficiency than a reverse Brayton cycle.
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