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Water heating coil
Fin Type: Coil
Tube Material: Copper, stainless steel
Fin Material: Aluminum, Copper, Brass, Steel, Stainless
Water heating coils are one of the simplest parts to an HVAC unit, but it can be important to know the parts so you know what type of connections and where they need to be located. Similar to chilled water coils, If and when a coil is to leak it usually happens in the copper u-bends.
But with hot high pressured water, it will first leak at the weakest place which can be on a return bend or in the middle of the coil. When patching a leak in the middle of the coil it will significantly destroy that area causing the coil to lose a great deal of efficiency.
Water heating coil description
Water heating coils are a type of heat exchanger often called hydronic coils that use hot water from a boiler to heat or remove moisture from the air. The air moves through the fins of the coil which is hot from water flowing through the tubes. This is a type of heat exchanger mostly used in commercial and industrial air handler units, roof top units as well as ductwork installations downstream.
In parts of the country and world, you may be more familiar with radiant heat or baseboard heat. Those particular units do not have air moving through them but simply radiates the air near the units. Hot water coils on the other hand are used in forced air systems and booster coils or reheat coils are used in ductwork downstream to reheat the air that has cooled off.
Water heating coil manufacturing process
Fins——Expansion——Casing——Brazing or welding——Testing——Crating
The cold machining process of fins provides excellent mechanical resistance , fins are strong and have strong resistance to atmospheric corrosion, etc. The pressure required to extrude the fin from the aluminum sleeve creates an excellent “pressure bond” between the two materials.
In addition, the aluminum finned material completely surrounds the metal of the tube, so there is no risk of electrical corrosion at the fin root (between the tube and the fin). All of these advantages ensure the most stable performance over time of all other fin types.
Water heating coil maintainance
The heated liquid does not contain substances that should not corrode the components. During use, the scale or carbon on the pipe surface should be removed frequently, otherwise it will affect the efficiency and life of the components.
The working voltage of the heating element shall not exceed 1.1 times of its rated value, the ambient humidity shall not exceed 95%, and the shell shall be effectively grounded.
The electric heating element of the water heating pipe should be stored in a dry place. If the insulation resistance to the ground is lower than 1MΩ due to long-term storage, it can be dried in an oven at about 200℃ for several hours to recover.
When tightening the main thread of the water heating pipe, do not use excessive force on the terminal.
Water heating coil applications
Booster heat, reheat, waste heat reclamation, pre-heat, fluid process heat and more.