Heatcraft Booster Coils

Available now in our online store

Northrich Company is pleased to offer Heatcraft Booster Coils. To accommodate minimal GPM flows, many of the sizes are the headerless type, and to keep water velocities above laminar flow situations.

On several of the larger sizes, headers are used in order to minimize water pressure drops and maximize capacities.

Coil sizes range from 6" x 6" to 24" x 48" and are available in both one and two rows deep. Northrich Company is able to cover many of your reheat applications needs with our partnership with Heatcraft.

Check out our impressive line of booster coils available for purchase in our store.

 

Chilled Water Coils

Chilled water coils are often used in commercial buildings. Chilled water coils respond to the cooling effect of surfaces when wet by moisture condensed from the air. The sum of sensible heat transferred by a dehumidifying cooling coil represents total heat values. Sensible heat transfer, whether cooling or heating, refers to the change in dry bulb temperature only. The system characteristics that affect a chilled water coil's performance are gallons per minute, velocities, and temperature ranges of the fluid through the tubes as well as the cubic feet per minute, velocities, and temperatures of air across the coil fins.

Hot Water Coils

Hot water coils, due to the ability of the water to freeze, will generally be found in a reheat portion of a heating system. Normally this insures that air below 35° will not come into contact with the reheat coil at a temperature between 45° and 75°. Hot water coils are typically located in duct work where zone heating takes place.

Steam Coils

Steam Distributing coil applications are primarily for below freezing air applications. The inner distributing tubes supply hot steam down the entire length of tubes, thus warming the condensate that has been formed inside the tubes.

Standard Steam coil applications are for above freezing applications. This coil requires standard oversized holes in tube sheets for expansion and contraction requirements.

Most HVAC preheat coils use 100 percent outside air with low pressure steam. In very large HVAC systems, longer coils (over 60" long) are required to meet the performance. These longer lengths could cause the 5/8" steam distributing coils to clog with condensate. This clogging reduces capacity because steam and condensate may take up the same space at the same time. It also may cause condensate freeze up. Therefore, 1" steam distributing coils are recommended for these applications.

Direct Expansion Coils

Direct Expansion coils are commonly used in air conditioning refrigeration applications and many types of commercial refrigeration systems. Air to be cooled or dehumidified is circulated through the finned surface. Multiple rows and various tube patterns are used to achieve the desired heat transfer from the air to the circulating refrigerant. Copper tubes with copper or aluminum fins are most commonly used for efficient heat transfer.

Air conditioning systems need to operate efficiently at maximum design loads as well as partial load conditions. Many types of system capacity controls are used to match the load requirement with system capacity. With refrigerant evaporator coils, this generally takes place in the form of surface reduction and/or one of the following:

VAV (Variable Air Volume) systems use buildup coil banks or large air handling units with one refrigeration system. To balance system capacity to load requirements, some form of face or row control is required. During the time of reduced capacity, it is imperative to maintain a fully active dehumidification process at the heat transfer coil. This is best accomplished by row control on standard DX coils or by use of "intertwined" refrigerant circuits. Row control is used for partial load surface balance. Whichever circuit is deactivated first results in full face area operation of the remaining circuit, keeping the full volume of air in contact with active coil surfaces.