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Evaporator Coil

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

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


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


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


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)


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


  • Sweat Brass
    • 0.625" OD - 2.625" OD


  • 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:

  • Coil model number
  • Duct size
  • Air Flow Rate in CFM (cubic feet per minute)
  • Entering Air Dry Bulb Temperature in °F
  • Entering Air Wet Bulb Temperature in °F (cooling coils only)
  • Fluid flow rate in GPM (gallons per minute, for water coils only)
  • Entering fluid temperature in °F
  • Desired capacity in MBH or tons
  • Desired leaving air temperature in °F

Sizing Guidelines

Blank Drawings

Related Applications:

Replacement Coil