Heat Exchanger Coils Water Coils DX Coils Condensers Dry Coolers

Heat Exchanger Coils

A complete range of Heat Exchanger Coils with a wide variety of dimensions and endless customisation options to suit your application.

3 diameters in 3 geometries (S22-7, S22-8, S22-10)
Heat Exchanger Coils optimized for a wide range of applications
4D product range meeting all heat exchange needs: water coils, evaporators (DX) and condensers.

Flexibility with a selection of production materials (copper, aluminum, galvanised steel, stainless steel, brass, etc.)
Multiple protective surface treatment options to choose from to suit your application environment.

Technical & Features

FINNED PACK

The finned pack consists of drawn tubes mechanically expanded into fins provided with self-spaced collars. This ensures optimal heat exchange between tubes & fins, plus regular spacing between fins.

FINS

Created by high precision molding of aluminium, pre-painted aluminium, hydrophilic aluminium and copper strips. The fins are corrugated so as to improve the secondary heat transfer coefficient without heavily affecting the air pressure drops. This allows for improved condensate drainage & prevents dirt from obstructing the finned pack. Also available are louvered fins, the structure of which increases heat exchange efficiency

TUBES

Our coils are manufactured with high quality tubes, which can be smooth or internally grooved on all diameters. The tubes are resistant to the vast majority of primary fluids in both heating and cooling applications alike.

FRAME

The frame can be of galvanized steel, aluminium, copper, brass, or stainless steel, manufactured through a process of punching and deep drawing. The frame protects the finned pack and fastens the heat exchanger to the rest of the system.

HEADERS

Headers are made of carbon steel or copper drawn tubes. The header collects all of the coil’s parallel circuits into one tube that will be connected to the main circuit of the equipment.

DISTRIBUTORS

4D offers brass Venturi-type distributors. Along with the brazed copper capillary tubes, these distributors optimize coolant distribution in the parallel circuits of evaporators.

REFRIGERANTS

In light of our commitment to product improvement & sustainability, 4D Coils Limited uses materials that are compatible with new generation refrigerants, which ensure lower environmental impact and excellent performance.

QUALITY

We inspect for proper mechanical expansion of tubes into the fins; brazing of bends, connections & headers in an inert atmosphere; final pressure leak test in a water bath. During final inspection, the coil is checked against the customer’s specifications to ascertain its compliance.

Flexibilty

4D Heat Exchanger Coils are highly customisable to suit your specifications or application. Each coil is individually designed, with the fin material selected to take into account the environment in which it is to be located.

Tube material, diameter and wall thickness is selected with the medium, temperature and refrigerant or working pressure in mind and to customers specifications. Casing material can be galvanised or stainless steel to suit harsher operating environments.

Fin Material Options
Materials: copper, aluminium
Different geometries
Special treatments including hydrophillic & pre-painted
Customisable Headers
Materials
Diameters
Various types of construction
Surface Treatments
Heresite
Blygold
Cataphoresis
Tube Configuration Options
Materials: copper, aluminium, stainless steel
Diameters: ∅7, ∅7.94 (5/16″), ∅9.52 (3/8″)
Cutsomisable Frame
Fe Zn, Al, Aisi
Cu Zn, Cu

Geometry

4D Heat Exchanger Coils are available in 3 geometries with the following configurations to suit a variety of applications & standardised packaged heating & cooling products;

S22-7

7mm tubes, in the staggered geometry 25.00 x 21.65 mm with corrugated fins. Ideal solution for small condensers & heat exchangers requiring lower internal volumes

Diameter 7mm

Geometry 25.00 x 21.65

S22-8

5/16″ tubes in the staggered geometry 25.00 x 21.65 mm with corrugated and louvered fins. Ideal solution for small condensers with capacities upto 12 kW; fan coils and air heaters.

Diameter 5/16"

Geometry 25.00 x 21.65

S22-10

With 3/8″ (9.52 mm) tubes in the staggered geometry 25.00 x 21.65 mm with corrugated and louvered fins, an ideal solution for medium sized condensers and fan coils.

Diameter 3/8"

Geometry 25.00 x 21.65

Configurations

The table below summarises tube geometries & specifications available for each tube diameter. With 3 tube diameters we can optimize heat exchangers for any specific application.

	Tube Diameter	Geometry Code	Geometry	Length	Tube Types	Tube Thickness – smooth	Tube Thickness – grooved	Fin Thickness Options	Fin Spacing Options
	mm	–	mm	mm	–	mm	mm	mm	mm
S22-7	7mm	7.	25 x 21.65	90-1000	Smooth / Grooved	0.25	0.31	0.10 / 0.12 / 0.15 / 0.18	1.6/3.2
S22-8	5/16″ 7.94mm	5.	25 x 21.65	90-4600	Smooth / Grooved	0.28/0.41	0.33	0.10 / 0.12 / 0.15 / 0.18	1.6/6.0
S22-10	3/8″ 9.52mm	6.	25 x 21.65	100-7350	Smooth / Grooved	0.28/0.35/0.5	0.33/0.4	0.10 / 0.12 / 0.15 / 0.18	1.6/6.0