Liquid gas refrigeration system
In this system the non poisionous liquid (Nitrogen) is used
to cool the space. This system is called as expandable
refrigerant refrigeration system also or chemical
refrigeration.
It is used on trucks and other vehicles in the transportation
and storage of refrigerated or frozen foods. It has a heavily
insulated space,which is cooled by either being surrounded
by tubes carrying evaporating liquid nitrogen or by spraying
liquid nitrogen directly into the space to be cooled. The
liquid nitrogen (see fig) is supplied from a cylinder inside
the refrigerated space is kept under pressure (200 psi).
An automatic pressure relief valve will open as a safety
measure and allows the nitrogen vapour to escape, while
the pressure exceed the relief valve setting.
A temperature servicing element control box and liquid
controls valve, control the flow of liquid nitrogen from the
nozzles. They maintain the desired temperature inside the
refrigerted space.
Негізгі бет Class -26 l Liquid nitrogen refrigeration system l
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