Evaporator Coil

Emergent Coils provides custom evaporator coils for a wide range of applications.

Design
Specifications
Performance
Sizing

Evaporator Coil Design

Evaporator coils are used to cool or remove moisture from air streams. They are sometimes called direct expansion. They are one of the four main components in the refrigeration or air-conditioning cycle. A liquid-vapor mixture of refrigerant enters the coil and cools the air as it evaporates, and eventually leaves the coil as a gas.

Typical applications for evaporators:

Comfort Cooling
Dehumidification
Process Cooling
Air Conditioning
Refrigeration

Evaporator Coils come in a variety of shapes and sizes, but there are some properties that are common in most evaporator coils:

Rows

Generally, the evaporating refrigerant temperature is closer to the air temperature than a heating coil. Also, to keep water from running off excessively the air face velocity has to be low. Both of these factors increase the number of rows required. Typical Evaporators will have between 4 and 8 rows.
Tube Diameter

The refrigerants moving through an evaporator have fairly high operating pressures, although they are significantly lower than those in the condenser. There are situations in which 5/8" tubes are used, but most commonly we see 3/8" and 1/2".
Connections

Connections for most refrigerant applications are copper sweat. Other types of connections are prone to leak, which is a big problem when working with refrigerants.

Evaporator Coil Specifications

Tubes

Constructed from UNS 12200 seamless copper while conforming with ASTM B75, ASTM B88 and ASTM B251d

1/2" diameter
- 0.017", 0.025", or 0.032" wall
3/8" diameter
- Rifled
  - 0.012" or 0.016" wall
- Smooth
  - 0.016" wall

Fins

All fins feature continuous die formed construction

1/2" x 1.250" x 1.083" pattern
- Waffle or flat corrugation
- H1100 aluminum or C12200 copper
- 0.0060", 0.0075", or 0.0100" thickness
- 4-14 fins per inch
3/8" x 1.000" x 0.866" pattern
- Waffle or louvered corrugation
- H1100 aluminum or C12200 copper
- 0.0045", 0.0060", or 0.0075" thickness
- 6-24 fins per inch

Headers

Constructed from UNS 12200 seamless copper while conforming with ASTM B75, ASTM B88 and ASTM B251d

Available Schrader valves for refrigerant charging or evacuation

Headers range from 0.75" nominal diameter (0.875" outside diameter) to 2-1/2" nominal diameter (2.625" outside diameter)

Connections

Sweat
- Copper (Type "L")
  - 0.375" OD - 2.625" OD

Distributors

Sweat Brass
- 0.625" OD - 2.625" OD

Casing

16 or 18 gauge
- Galvanized Steel (G90)
- Stainless Steel (304)
- Stainless Steel (316)
- Aluminum (H11)

Evaporator Coil Performance

Coil performance varies greatly from application to application. Flow rates and temperatures for both fin and tube sides will greatly influence the performance characteristics for any given coil.

We have state of the art software that we can use to quote performance. For a detailed performance run tailored to your situation, please email sales@emergentcoils.com with as many of the following details as you have available: