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The Technology of Radiant Tubes
Flexibility is our strength. Schwank infrared radiant tube heaters are ideal for a wide range of heating applications, including those with average to low ceiling heights. The new and innovative burner which is used in all our radiant tube appliances constitutes the core of Schwank tube heaters. The Schwank burner is the result of permanent development and more than 50 years of experience.
Firing rates from 45,000 Btuh to 200,000 Btuh, tube lengths from 10 to 70 feet in “U”-tube or straight tube configuration, and an optional modular 90° elbow kit ensures that system design matches your heating needs. To satisfy heating and comfort requirements of a building with a one million Btu per hour heat loss, the illustration below compares the required input and the sensible heat output that is delivered to the occupancy level for various heating system technologies.
Schwank Burner – The Core Technology:
- Long flame – high efficiency
The Schwank ceramic burner creates a long and laminar flame in the tube system. This leads to a uniform transfer of heat to the tube, ensuring even distribution of the radiant heat. This makes Schwank tube heaters extremely energy efficient.
- As Quiet as a Whisper
The position of the fan, high quality motor bearings and the optimized flow properties of the burner make the system very quiet - as quiet as a whisper.
- 2-stage feature improves comfort
This technology, known from boilers, is now available for Schwank tube heaters. The 2-stage feature allows controlling the heat output according to the actual heat requirement. This improves heating comfort and can save energy.
- Pressure or vacuum system
A pressure burner system achieves reliability. Important burner components, such as the fan and bearings, are not exposed to the heat and moisture of the exhaust flue gas. This considerably increases the lifetime of the system and reduces life-cycle costs. When and where required, Schwank also offers a vacuum tube system constructed of high quality durable components.
Comfortable Control
Our heating systems can be controlled according to individual project needs ranging from single thermostat, TruTemp infrared set-back thermostat, to a central building control.
The Combustion
The gas-air-mixture is created in an especially designed burner.
This mixture is forced through a ceramic tile – a Schwank invention – and is ignited at the surface by an electrode. With this construction, natural gas or LPG combusts in a laminar flame that reaches a length of up to 16 feet. The tube is heated by the long flame and combustion gasses and emits comfortable infrared radiant heat. An integrated turbulator ensures even temperature distribution over the total length of the tube. Air Intake and Exhaust
The flue gas of the radiant tube is carried through a four inch exhaust vent system to the outside. The combustion air can be taken from the inside the building or from the outside through an air intake duct.
Individual Heaters and Heating Systems
Besides the exhaust vent system for individual heaters, it is possible to indirectly vent our tube heaters with a central flue fan. Do not hesitate to ask us for assistance in the planning of such systems. Radiant Tube Heater Construction
We have designed the highest level of quality into our products: the tubes consist of aluminized and heavy gauge emissive coated steel to provide corrosion-resistant durability and withstand high temperatures. The radiant-optimized Focus Shield reflector traps convection heat for conversion to radiant heat that is directed to the area where it is needed. This additionally increases the radiant performance and increases the level of comfort.
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