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Turbine power output can be increased
substantially by chilling the inlet air. IHT has supplied inlet chilling coils
on over 250 gas turbine projects worldwide. IHT has incorporated many features
into these coils as further described below |
Flat
Fins |
Flat fins are used where cleanability is important or if
fins are in the horizontal position in condensing service. |
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Configured fins offer improved heat transfer
performance with low Reynolds Numbers (face velocities below 350 Ft/Min); but
with an increase in pressure drop.
At 500-600 Ft/Min face velocity, Flat fins offer
improved performance at lower pressure drop. Over 95% of IHT's inlet
chilling coils have been FLAT FINS! |
Configured Fins |
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Mechanical Bond |
An oversized ball is driven through the un-expanded tube.
This expands the tubes into the fin collars providing a mechanical bond that
lasts a lifetime and insures high heat transfer efficiency. This bond is
designed for up to 1000 deg. F. |
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Other Casings
IHT
Casings |
Many coil manufacturers provide casings as shown on
the left. IHT provides configured casings that are formed on metal brakes for
greater rigidity and structural strength. Stainless Steel is the common
material of construction normally supplied for this service. Heavy gauge metal
thickness (up to 7 Ga) is standard on larger coils. Weld nuts are commonly
added to the casing for ease of installation.
This design recesses the fins into the casing and
prevents air bypass. On non-interlocking designs, 3% of
the air typically bypasses the fins along the casing! This can cause uneven
cooling and loss of performance. |
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Coil Construction
- .011 thick flat Aluminum Fins
- 5/8" .024" tube wall Copper Tubes
- 304 SS Casings and Intermediate Supports
- 304 SS or Copper Headers
- .0005 Btu/Hr-ft2 -F Fouling Factor is included as
standard
Optional Features
- Baked Pheonolic (Heresite) coating for a salt air
environment
- Copper fins for increased corrosion resistance
- Backing nuts welded to the casing for ease of
installation
- Increased fouling factors can be added for fluids
containing sediment or hardness
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