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Fluid-air heat exchangers

Armstrong International

  • Exchange coil / steam

Article: 00053583

Exchange coil / steam

For air-heating coils, steam is the preferred medium for heat transfer throughout much of industry. Steam is easy and inexpensive to move from the boiler to the point of use, and it gives up much of its energy at a constant temperature when it condenses. Process control is easy and fast with steam, and there is essentially no lag time.

Making decisions about coil construction and materials is a multi-step process involving many factors. Armstrong?s line of heavy-duty steam coils is designed and manufactured to provide what you want most?long life and efficient heat transfer.

Standard coils (Type S)
This type of coil is used for most applications where entering air temperatures are above 35?F (2?C) and steam is at constant pressure. It is used extensively in high-temperature process applications and for ?reheat? in HVAC systems. It is not, however, recommended where even outlet air temperatures are required immediately after the coil, such as in multi-zone heating systems or where a modulating steam control valve is used to control temperature. (See drawing.)

Centifeed coils (Type C)
The single-row centifeed coil can be used where air is below freezing and/or modulating control is used. It is recommended where:

A single row delivers the required performance
A modulating steam control valve is used
Even outlet air temperatures are required over the whole coil face
Stainless steel tubes are used

Two-row centifeed coils are available where (B) and (C) are required, but tandem-type coils are a better choice with freezing air temperatures

Specifications

  • Options: steam

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