The core element of comfort cooling
It draws heat from air into chilled water from the chiller or into the refrigerant directly, forming the cooling side of air handling units and fan coil systems.
Product group · Heat Transfer Products
Cooling Coils
The cooling and dehumidification element of air handling units, drawing heat from air into chilled water or a direct-expansion refrigerant. Used from comfort cooling to industrial humidity control.
CapacityProject-specific
FluidChilled water (6-12 °C) / DX
Tube materialCopper
Fin materialAluminum (hydrophilic coating optional)
Cooling coil · air flows vertically, cold fluid passes horizontally
Why it matters
What does a cooling coil do?
When the air passing through an air handling unit needs to be cooled and dehumidified, that job falls to the finned tube coil, which brings the air into contact with a cold surface.
Also handles dehumidification
When air is cooled below its dew point, the moisture it carries condenses out. A cooling coil lowers temperature and controls relative humidity at the same time.
Flexible integration with a DX or water circuit
It can be designed for either a chilled water circuit or a direct-expansion (DX) refrigerant circuit, selected to match the existing cooling infrastructure.
Works together with condensate drainage
Condensed moisture collects in a drip tray and is removed through a trapped line; drainage that isn't properly designed creates a risk of overflow and mold.
Types
Sub-types of cooling coils
All three cool air; what sets them apart is the refrigerant type and the dehumidification capacity.
Chilled water coil
The standard element of central cooling systems, running on chilled water from the chiller (typically 6-12 °C).
- Compatible with central chiller systems
- Suited to a wide capacity range
- Capacity can be adjusted via the chilled water flow rate
Direct-expansion (DX) coil
A type widely used in split and VRF systems, where the refrigerant vaporizes directly in the tubes.
- Needs no central water circuit
- The number of circuits is calculated from the refrigerant type
- Common in split/VRF air handling units
Deep-row dehumidification coil
Designed with more rows and tighter fin spacing to increase the air's contact time with the cold surface, for applications needing intensive humidity control.
- High dehumidification capacity
- Higher air resistance, affecting fan selection
- Used in storage and areas needing precise humidity control
Selection criteria
What data determines the right cooling coil?
Capacity alone isn't enough. Once the six points below are clear, the choice narrows to a single model.
ParameterWhy it mattersWhat we need from you
Cooling capacity
Air flow rate together with the inlet–outlet temperatures determines capacity. An undersized coil can't reach the target temperature and humidity.
kW and air flow rate (m³/h)
Fluid type
Chilled water (typically 6-12 °C) or a DX refrigerant; each calls for a different circuit and connection design.
Chilled water / DX (R410A etc.)
Dehumidification / dew point target
The target relative humidity and outlet temperature determine the number of rows and the fin spacing.
% relative humidity + °C dew point
Air flow rate and face velocity
Fin spacing and row count are optimized against face velocity. Getting it wrong causes either excess pressure loss or insufficient heat transfer.
m³/h and m/s
Fin coating and ambient conditions
Coastal locations, high humidity or dirty environments call for a hydrophilic/epoxy coating or stainless steel.
Standard / hydrophilic / epoxy
Condensate drainage
The drip tray size and drain line slope are designed to match the amount of condensate generated.
Drain line diameter and slope
For a quote, having the following is enough
It's fine if you don't have all of it. We'll fill in the gaps together with you.
Create a quote request- Cooling capacity (kW)
- Air flow rate and inlet–outlet temperatures
- Fluid type (chilled water or DX)
- Target relative humidity / outlet temperature
- Ambient conditions (coastal, dirty air, etc.)
- Mechanical project or specification, if available
FAQ
Questions from the field
The questions we hear most often when quoting cooling coils.
Where does condensate go in a cooling coil?
As the air is cooled, the moisture that condenses is collected in a drip tray beneath the coil and removed through a trapped drain line. The tray and drain line slope are designed together with the capacity.
What is the difference between a DX coil and a chilled water coil?
In a chilled water coil, chilled water from the cooling plant (typically 6-12 °C) circulates through the circuit. In a DX coil, the refrigerant itself vaporizes directly in the tubes to draw heat; this is common in split/VRF systems, and the number of circuits is calculated separately.
Is a dehumidification coil different from a standard cooling coil?
Yes. In applications needing intensive dehumidification, more rows and tighter fin spacing keep air in contact with the cold surface for longer; this raises air resistance, which directly affects fan selection.
What coating should be used in coastal or dirty environments?
Standard aluminum fins can corrode quickly in salty air and dirty environments. In these conditions, hydrophilic or epoxy-coated fins are preferred, and in some cases stainless steel.
Do you only serve Istanbul?
No. While our office is on Istanbul's Anatolian side (Ataşehir), we supply and ship across Istanbul's European side, the surrounding provinces and the Marmara region, and Turkey as a whole — covering your equipment end to end, from a single source.
Next step
Let's calculate the capacity together
Share the air flow rate, temperature range and fluid type, and let's work out the right coil together.
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