GLOSSARY TERMS

AIR PRESSURE DROP

This is the air pressure drop for the coil at standard rating conditions. The air pressure drop is a function of flow rate, Fin Type, Rows and FPI. In addition, on dehumidifying coils, the air pressure drop is affected by the condensate on the fin surface.

AIRFLOW (CFM)

Airflow refers to the volumetric flow of air across the coil. CFM stands for Cubic Feet Per Minute. The amount of airflow allowed across a coil is a function of the face velocity. Too little airflow may cause unpredictable thermal performance, while too much airflow may cause water carryover, noise and erosion problems.

For wet coils (where the total capacity is greater than the sensible capacity), a face velocity of less than 550 SFPM should be maintained.

CASING MATERIAL

Casing material refers to the end plates, tube supports and top & bottom plates. We offer the following materials: Galvanized Steel, 304 Stainless Steel, 316L Stainless Steel, and Aluminum. Casing material affects the coil weight and price.

CASING TYPE

All coils are offered with the following casing options: Slip and Drive, Flanged (Standard), Inverted, Stackable, Collared End Plates and End Plates Only. With Steam Coils, you are also given the option of a Pitched Casing.

COIL COATING

We offer three different types of protective coatings for your coils based on application and environment.

For coastal environments the entire finned surface of the condenser and evaporator coil is coated with Energy Guard® DCC Green.
For sever coastal environments and marine applications coils are coated with Energy Guard® DCC Green LV, and the interior and exterior case and cabinet are coated with Ameron PSX® 700 Epoxy Coating.
For industrial applications coils are coated with Energy Guard® DCC Green LV. The interior and exterior case and cabinet and all refrigeration lines including all exposed copper are coated with Ameron PSX® 700 Epoxy Coating.

COIL STYLE

Coil Style refers to the circuiting arrangement of a DX coil. Available styles include: Standard (single circuit), Face Split (dual circuit), Row Split (dual circuit), Interlaced (dual circuit) Face Split, Interlaced (4 circuits). The coil style is a function of the application. Feel free to contact us if you need help making a selection.

CONDENSING TEMP.

This value is only applicable to Condenser coils. Condensing Temperature refers to the saturated refrigerant temperature at the inlet of the condenser coil. Condenser coil capacity is proportional to condensing temperature.

CONNECTION MATERIAL AND TYPE

Valid connection materials and types are as follows:

DX & Condenser Coils – Copper SWT Only
Water & Steam Coils – Copper SWT, MPT or FPT, and Steel MPT or FPT, Flanged or Grooved, and Red Brass MPT or FPT.

ENTERING AIR DRY BULB TEMPERATURE

The sensible temperature entering the coil is referred to as the entering air dry bulb temperature.

ENTERING AIR WET BULB TEMPERATURE

The temperature of the air entering the coil as measured by a psychrometer. This temperature represents the amount of moisture in the air.

ENTERING FLUID TEMPERATURE

This value is only applicable to Water coils. This is the temperature of the fluid (water/glycol) at the inlet of the coil.

EVAPORATING TEMPERATURE

This value is only applicable to DX coils. The Evaporating Temperature is the saturated refrigerant temperature at the exit of the DX coil. DX Coil capacity is inversely proportional to evaporating temperature. This temperature does not include superheat. The amount of superheat at the exit of the DX coil has been factory set at 10 °F for calculation purposes.

FACE PITCH

Face Pitch is the centerline distance between two consecutive tubes in the coil face.

FEEDS

The number of parallel circuits in the coil.

FEMALE PIPE THREAD (FPT)

A segment of threads on the inside diameter of the pipe. FPT’s connect to MPT (Male Pipe Thread) Connections of the same outside diameter.

FIN HEIGHT

Fin Height is the distance of the front face perpendicular to the tubes. This dimension can only be in multiples of the face pitch. Please see Fin Type for more information on face pitch values.

FIN MATERIAL

Currently, there are two options for fin material:
1. Aluminum (Standard)
2. Copper
Note: Fin material will impact the thermal performance, weight and price of the coil.

FIN THICKNESS

Available Fin Thickness is a function of the Fin Type. Fin thickness will impact the thermal performance, weight and price of the coil.

FIN TYPE

Fin Type refers to the desired coil fin surface. The fin type specifies the Tube OD, Face Pitch, Row Pitch and Configuration of the fin. Fin Type descriptions are as follows: Tube OD _ Face Pitch x Row Pitch _ Configuration

FINNED LENGTH

Finned Length is the distance of the front face parallel to the tubes.

FINS PER SQUARE INCH (FPI)

Fins per square inch represents the total number of fins that occupy one inch of space when measured horizontally.

GALLONS PER MINUTE (GPM)

This value is only applicable to Water coils. This is the volumetric flow rate of the internal fluid (water/glycol).

COIL HAND

Coil hand can sometimes be confusing…different manufacturers have different ways of referencing the coil hand. Our standard reference is determined by the entering air side of the coil. When facing the entering air side of the coil, a right hand coil will have the manifolds located on the right and a left hand coil will have the manifolds located on the left.

LEAVING AIR DRY BULB TEMPERATURE

The sensible temperature leaving the coil is referred to as the leaving air dry bulb temperature.

LEAVING AIR WET BULB TEMPERATURE

The temperature of the air leaving the coil as measured by a psychrometer. This temperature represents the amount of moisture in the air.

LEAVING FLUID TEMPERATURE

This value is only applicable to Water coils. This is the temperature of the fluid (water/glycol) at the outlet of the coil.

LIQUID TEMPERATURE

This value is only applicable to DX coils. Liquid Temperature is the temperature of the subcooled refrigerant entering the DX coil. Neglecting temperature loss in the liquid line, this is equivalent to the refrigerant temperature leaving the condenser.

MANIFOLD

Manifold refers to a segment of tubing that connects supply and return feeds with the purpose of consolidating the amount required connections.

MALE PIPE THREAD (MPT)

A segment of threads on the outside diameter of the pipe. MPT’s connect to FPT (Female Pipe Thread) Connections of the same outside diameter.

REFRIGERANT PRESSURE DROP

Applicable to DX and Condenser Coils. This is the difference in refrigerant pressure at the inlet and the exit of the coil.

ROW PITCH

Row Pitch is the centerline distance between tubes in one row and the next.

ROWS

Rows represents the coil depth in rows. Row availability is a function of the coil type.

SENSIBLE CAPACITY

Sensible capacity refers to the amount of heat transfer measured by a change in dry bulb temperature. This value is applicable to all coils. The sensible capacity for a heating coil or a dry cooling coil will be equal to the total capacity.

On wet coils, the difference between total and sensible capacity is called latent capacity and it is a function of the water vapor condensed out of the airstream during the cooling/dehumidifying process.

STEAM CONDENSATE

Applicable to Steam Coils only. This the amount of condensate generated by a steam coil operating at the specified conditions.

STEAM PRESSURE

This value is only applicable to Steam coils. Steam Pressure refers to the saturated steam pressure at the inlet of the Steam coil. Steam coil capacity is proportional to Steam Pressure.

SUBCOOLING

This value is only applicable to Condenser coils. Subcooling refers to the difference between the saturated refrigerant temperature and the actual refrigerant temperature at the exit of the condenser coil.

TOTAL CAPACITY

This is the total capacity of a single coil at the conditions specified. This value is applicable to all coils. Tube material will impact the thermal performance, weight, and price of the coil.

TUBE DIAMETER

The distance across the extreme outside dimension of a tube. It is sometimes called the OD or outside diameter.

TUBE THICKNESS

Available Tube Thickness is a function of the Tube Diameter and therefore a function of Fin Type. Note: Tube thickness will impact the thermal performance, weight and price of the coil.