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Heat Exchangers performance is enhanced when fin to tube contact is made positive. The latest designs include mechanical expansion of aluminium tubes into aluminium fins. This feature enhances the
capacity to a great extent. Thereby reducing no-frost evaporator size.
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The
fins stand separately, divided into
several distinct layers, thus inhibiting
the formation of boundary layers and
permitting a high rate of contact
between fins and air.
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Use
of expansion system enhance closed
contact of the fins and refrigerant
tubes and reduce the contact resistance.
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The
pitch of the fins can be adjusted in
stages according to frost build-up.
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A
serpentine refrigerant circuit is made
of one piece tubing, thus reducing
welding points and leakage
problems.
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With reduction in size a great economy is achieved.
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Reduced size makes no-frost coil much lighter.
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For
low temperature application fin spacing should vary from 5 mm pitch to 15 mm pitch from top tube to bottommost tube. This is necessary to have maximum heat transfer efficiency for top 2
top and at the same time having very effective defrosting on the lower tubes. This is possible only with present designs.
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These evaporators are made
for R134a application with following process included in the manufacturing.
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Evaporative oil is used for expansion.
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Evaporators are internally cleaned under pressure with TCE and flushed with dry air.
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Evaporators are dehydrated when passed through continuous type oven at 60 deg C for 6 mins.
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Dry air is flushed
through the coil.
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Dry nitrogen is flushed through the coil and the coil is sealed with positive pressure.
