Exhaust Air Chimneys
Big Dutchman offers an extensive product line of exhaust air chimneys and corresponding chimney fans for optimal exhaust air removal. Thanks to the flow-optimised chimneys, the fan’s air performance is improved and power consumption can be reduced by up to 20 percent.
The fans we use in our chimneys are of an exceptionally high quality, winter-proof and corrosion-free, and consume little power. Our product range includes both the well-proven standard FC fans and a new generation of fans with aerodynamic blades. These fans require even less power and are pressure-resistant and quiet. Our recommendation is to install three-phase fans. These are very pressure-resistant and much more efficient than single-phase fans (power requirements up to 10 percent lower). The following chimneys and connected systems are available:
- CL 600 and CL 920 exhaust air chimneys
- CL 600 guide vane
- BD exhaust air chimneys VC
- chimney silencers
- centralised exhaust air removal
- Dynamic MultiStep
CL 600 – the Original for climate pros
The CL 600 exhaust air chimney has an aerodynamic shape and ensures optimum ventilation conditions. The chimney is made of polypropylene, has a smooth, dirt-repelling surface and is insensitive to sunlight and frost. The chimney can easily be cleaned with a high-pressure cleaner.
The labyrinth seal installed between the roof duct and the roof sheet guarantees watertightness. No additional sealing material is required. The self-supporting design renders supplementary suspension or bracing unnecessary. Roof sheets and external extension ducts are made of GRP and can be adapted on site. The roof sheet is available customised to the roof slope, roof profile, height above roof, colour of the roof and for side or ridge installation.
In addition to different standard roof sheet profiles, we can also provide customised profiles. The ridge-installed roof sheet is available as smooth version only. Assembly and disassembly are easily possible.
CL 920 – the XL version
The air performance of the CL 920 is almost double that of the CL 600, which is why the CL 920 should be installed in barns with large exhaust air removal requirements. The suction head with integrated butterfly valve and the diffusor are made of polypropylene. The high-density polyurethane foam exhaust air duct consists of two half pipes, thus saving transport costs.
This structure ensures good insulation and prevents condensation water. The chimney is also easy to clean. Noises are significantly reduced as an additional advantage. The chimney can be connected to the roof by means of a roof sheet, similar to the CL 600, or by means of an economic, universal roof covering.
CL 600 guide vane
The CL 600 guide vane is simply screwed tightly to the CL 600 exhaust air chimney right above the fan. The exhaust air jet is concentrated by deviating the radial and circular flow components. This leads to a significantly increased working range of the chimney. The guide vane can be retrofitted easily.
- up to 80 % increased working range of the chimney;
- only minimal decrease (approx 3 %) in exhaust air performance of the chimney;
- no chimney extension required → no storm bracings, no unappealing outward appearance of the barn;
- economic alternative compared to chimney extension;
- quick and easy assembly.
BD exhaust air chimneys VC
BD exhaust air chimneys are available with several different diameters (520, 650, 730, 820, 920 and 1270 mm) and can therefore be adapted to any ventilation concept and spacing of roof trusses. The fans and exhaust air chimneys offered by Big Dutchman are exactly coordinated. An exhaust air chimney with aspirating mouth and diffusor leads to a 10 to 15 percent higher air performance. At the same time, the specific power consumption is reduced by 5 to 10 percent.
BD exhaust air chimneys consist of 30 mm thick polyurethane pipes coated with smooth, glass-fibre reinforced polyester. This means that all BD chimneys are well-insulated, condensation water is prevented and noises are reduced.
The chimney pipes are delivered in halves (VC) and are assembled on site, thus saving transport costs. They are, however, also available as full pipes (AF). The chimney is closed off by a butterfly valve. Each chimney is delivered with the necessary fixing material. A roof sheet seals all chimneys.
The new chimney silencer is an innovation used to reduce noise emissions. The German Technical Inspection Association TÜV Nord measured a noise reduction of up to 12 dB(A) (for pipe diameters of 650, 730, 820 and 920 mm) in official tests. The total length of the silencer is 2.5 m.
Central exhaust air removal
Reducing emissions from livestock housing facilities will become more and more important in the future. Especially for new barn buildings, licensing authorities often require that the point of exit of the exhaust air be installed at a height of no less than 10 m and that the exhaust air is extracted at one location (i.e. bundled). This makes the air jet produced by a bundled emission source more stable.
- separation of animal area and exhaust air tower significantly improves hygienic conditions;
- no leaking air because of idle fans;
- no openings for unwanted leakage of rain water into the building;
- no undesired incidence of light;
- thorough and simple cleaning of tower and chimneys with a high-pressure cleaner, separate from the barn;
- simple installation of the chimneys on the tower;
- no problems with the static values of the roof;
- no stability problems in case of strong wind.
The exhaust air principle MultiStep® combines stepless control and group control. The principle’s advantage is a significant reduction in energy consumption while the same air performance can be maintained: Compared to traditional negative-pressure systems, annual savings of up to 50 percent are possible.
Due to the steady, maximum exit speed of the exhaust air, unpleasant odours are significantly reduced. The entire ventilation system is more pressure-resistant and less susceptible to wind.
The enhanced version of the well-proven MultiStep principle is called “Dynamic MultiStep”. This system works exclusively with the new ECblue fans that save even more energy. Instead of starting them at 100 percent speed, these fans begin working as early as at 30 percent (up to 50 percent depending on the required pressure resistance). Only after all fans have been started one after another at 30 percent is their speed increased simultaneously to 100 percent when the ventilation demand requires this.
Compared to the already very energy-efficient MultiStep solution, the power consumption of the new Dynamic MultiStep exhaust air principle is another 50 percent lower! The climate computer is responsible for controlling this system as well.
ECblue fans not only save energy but are also extremely resistant to pressure and thus less susceptible to wind. This stability is very important when using minimum ventilation. This is because strong winds have extreme effects on the minimum ventilation concept, especially regarding the animal’s well-being and the heating costs.
The noise level of the ECblue fans is also approx. 50 percent lower than that of standard fans. ECblue is powered by an external-rotor EC motor. When using these fans in combination with Dynamic MultiStep, you may save up to 75 percent in electricity costs compared to traditional systems!
- very high energy-saving potential;
- high efficiency in the entire speed range;
- universal activation via a 0-10 V analogue signal;
- pre-set ventilation level is precisely maintained due to the included speed feedback;
- very low noise level thanks to corrugated blade edges;
- easy and cost-efficient installation.
DynamicAir is a new principle invented to optimise the air exchange in livestock housing facilities. Especially with minimum ventilation, it is very important to know exactly how much air passes through the exhaust air chimney to be able to provide optimal climate conditions for the animals and to reduce the heating costs at the same time.
To use DynamicAir, a negative-pressure sensor has to be installed in the aspirating mouth of the chimney. The sensor converts the measured differential pressure signal into an analogue 0-10 V signal and transmits this information to the climate computer. The computer translates this signal into the respective exhaust air rate. This permits a very accurate control of the air exchange. The climate computer contains the characteristic curve of the extraction unit as determined in a test facility. The DynamicAir sensor can be retrofitted easily.
- very accurate recording of the air rate of exhaust air chimneys without any additional mechanical/moving components;
- reduction of heating costs thanks to precise minimum ventilation;
- suitable both for new buildings and for retrofitting*;
- long service life at a continuously high operational reliability;
- patent pending.
* only in combination with the 135pro, 235pro and ViperTouch climate computers