I Sainsbury's
Horsham store in
Sussex, Britain,
goes green by
adopting secondary
refrigeration
for storing both
chilled and frozen
foods. Ammonia is
used as the main
refrigerant while
the secondary
cooling agent is a
combination of
glycol and silicon
oil (Technology
Partnership
Initiative, issue 7).
Each of the nine
compressors
contain 140 kg of
ammonia, while
the secondary system
uses 3,960 kg
of propylene glycol.
Serving 41
chilled use
sections, the system
can
recover heat. The
likelihood of leaks
has been minimised
by operating
the unit at low
pressure and maintaining a constant
flow in the secondary circuits.
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