‘Freeze Resistant’
Applications
Supply pre-heat, outside air tempering, and modulating steam applications are typical uses for steam distributing coils.
With our tube-within-tube design, steam distributing coils provide a level of protection against freezing in low-temp applications. The inner tube insures steam distribution through the full length of the coil, keeping a constant outside tube temperature under all conditions.
Steam enters through the supply connection and into the internal distribution tubes. Directional dispersion holes meter the flow of steam from inside the distribution tube into the space between the tubes. The steam then condenses and flows into the return header. Steam Distributing coils maintain a constant temperature rise across the face of the coil while facilitating condensate drainage.
A common misconception of steam distributing coils is that they provide non-freeze protection. While all coils are subject to freezing under the right conditions, we refer to steam distributing coils as ‘freeze-resistant’.
What is the difference between a steam coil and a steam distribution coil? Steam coils are circuited like standard water coils, designed for applications where the entering air temperature is 13 degrees Celsius (55 degrees Fahrenheit) or higher and are not suited for outside entering air. Steam distribution coils are manufactured for low temperature applications with a tube within tube design. Steam entering the header is distributed to the inner tubes. From the inner tubes the steam is then distributed through small holes or “Steam Jets”. These Steam Jets are directionally punched, so that the steam helps push the condensate in the outer tube toward the outlet connection. The main decision in deciding what coil to use is entering air temperature. What type of steam coil is most efficient and effective? Steam distribution coils offer better distribution of the steam throughout the entire coil allowing steam condensate to exit as quickly as possible, allowing for an efficient effective steam coil. Standard steam coils reduce even distribution of steam and do not allow the condensate to exit the coil at a fast rate allowing for possible steam obstruction. Many times steam distribution coils are the primary product for steam heat. Does a steam coil need to be pitched? All steam distribution coils need to be pitched to allow proper removal of condensate. Madok steam distributing coils feature a pitched in casing design that is manufactured to be pitched within a level casing allowing our customers to install a level steam coil that is built with proper pitch. This along with placing the return connection at the lowest possible point on the header ensure proper and efficient operation of the steam coil. Standard Steam Coils do not need to be pitched for correct operation. Heresite protective coating – standard! Madok Steam Distributing Coils are designed to perform and built to last. We are Canada’s authorized applicator of Heresite Protective Coatings. We know the value of protecting your HVAC-R investment and understand the benefits that Heresite phenolic coatings bring to our products. Steam Distributing Coils are hard at work in some pretty nasty environments. We know what these coils are up against, so we apply Heresite baked phenolic coating to every Madok Steam Distributing Coil that we make – standard! That’s a feature that’s hard to ignore and one that delivers tangible results over the long term.