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Why green roofs? |
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Green buildings retain rainwater, humidify the air, cool, reduce noise and filter dust and pollutants. Carefully designed roof gardens not only provide a habitat for animals and plants, but also serve as a recreational area.
Such green roof areas provide a visual enhancement of urban areas and thus improve the cityscape. From an economic point of view, green roofs can reduce operating costs and energy consumption. Due to their cooling effect, green roofs increase the yield of solar systems. As green roofs equalise the temperature and protect against UV rays, the service life of the roofs can almost double. This also makes the operation of the building more favourable. With our green roofs, green areas of a few square metres up to > 50m2 can be created for sound enclosures for large heat pumps or cooling systems. |
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Simulation of air flow and air velocity |
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Due to the dense construction, important green spaces are missing. In addition, heat pumps and air conditioning units are often located in courtyards and do not meet aesthetic requirements.
Our green acoustic enclosures are visually appealing thanks to the free choice of RAL colour in combination with the plants. They also make an important contribution to the fight against climate change. Green sedum plants, which require little water and sunlight, are particularly suitable for planting on sound enclosure roofs. The roof, which is designed as a plant trough, offers a depth of 20 cm for the plants. A filter fleece is integrated into the tray. A mixture of perlite and plant soil is suitable as a substrate. This combination allows the plant tray to be filled without creating a great deal of weight and provides the plants with an ideal structure for root formation. |
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Systems in the lower output range usually only have a maximum static fan pressure of 20 Pa, while larger systems, where heat recovery is also an issue, for example, have a much higher pressure. The first resistance that fans have to overcome is pressure loss when air enters the evaporator.
In addition, with most axial fans, the air is not discharged centred above the fan, but the greatest air volume and air speed is achieved at the edge of the fan blades. This must be taken into account when measuring the air volume and air speed of systems, as these values can increase by up to 60% from the fan centre to the outer edge of the fan. This prevents incorrect plan data from being used.
The design of acoustic enclosures for air-cooled systems is primarily based on the required air volumes of the systems and the desired air velocities; the physical dimensions of the systems are only of secondary importance when planning acoustic enclosures.
For an air volume of 6,000 m3/h, a free air inlet and outlet area of 0.83 m2 is already required to keep the air velocity at 2 metres/sec. The free area means the net area without grille or louvre structures.
For a large heat pump with a required air volume of 250,000 m3/h, the net free air inlet and air outlet areas are already 36.11 m2 at a planned air velocity of 2 metres/sec. It goes without saying that practically no noise reduction can be achieved with this free area (sound bridge). Here, the planned air velocity must be raised to a higher level; an air velocity of 6 metres/sec. already reduces the required free area to 12.04 m2 and thus optimises the sound insulation many times over.
In conclusion, standardisation of acoustic enclosures based on system size falls short and can lead to performance losses in the systems that often go unnoticed, regardless of whether this concerns acoustic enclosures with baffles, acoustic enclosures with targeted air routing or supply air and exhaust air acoustic baffles. The simulation or calculation of the air supply to the evaporators and condensers and the removal of cold air is a decisive factor when planning acoustic enclosures.
In addition, with most axial fans, the air is not discharged centred above the fan, but the greatest air volume and air speed is achieved at the edge of the fan blades. This must be taken into account when measuring the air volume and air speed of systems, as these values can increase by up to 60% from the fan centre to the outer edge of the fan. This prevents incorrect plan data from being used.
The design of acoustic enclosures for air-cooled systems is primarily based on the required air volumes of the systems and the desired air velocities; the physical dimensions of the systems are only of secondary importance when planning acoustic enclosures.
For an air volume of 6,000 m3/h, a free air inlet and outlet area of 0.83 m2 is already required to keep the air velocity at 2 metres/sec. The free area means the net area without grille or louvre structures.
For a large heat pump with a required air volume of 250,000 m3/h, the net free air inlet and air outlet areas are already 36.11 m2 at a planned air velocity of 2 metres/sec. It goes without saying that practically no noise reduction can be achieved with this free area (sound bridge). Here, the planned air velocity must be raised to a higher level; an air velocity of 6 metres/sec. already reduces the required free area to 12.04 m2 and thus optimises the sound insulation many times over.
In conclusion, standardisation of acoustic enclosures based on system size falls short and can lead to performance losses in the systems that often go unnoticed, regardless of whether this concerns acoustic enclosures with baffles, acoustic enclosures with targeted air routing or supply air and exhaust air acoustic baffles. The simulation or calculation of the air supply to the evaporators and condensers and the removal of cold air is a decisive factor when planning acoustic enclosures.
Sound enclosures modular frame structure |
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The basic structure of the acoustic enclosure consists of individual modules made of aluminium plug-in profile frames. In the example below, 4 individual modules were connected on site to form an acoustic enclosure.
The air inlet openings and air outlet openings and the service doors around the system are integrated into the profile frames. The service doors are based on aluminium panels with a thickness of 1.5 mm with 40 mm thick Stratocell® Whisper insulation on the inside. The sound enclosure example shown below for 2 sound enclosures mounted one behind the other consists of 4 modules which, when assembled, have the following dimensions: 13,600 x 3,400 x 3,222 mm (L x W x H) with a weight of 2,322 kg. The free surfaces of the air inlet and air outlet openings are designed for an air volume of 650,000 m3/h. The air flow is offset to the side so that no air short circuit can occur between the exhaust air and supply air. The air inlet is on the left or right on the narrow side of the bonnet, the air outlet on the long sides at the top. By deflecting the air by 90°, the airborne sound is broken up and the air outlet speed is reduced to around 5 to 6 m/sec, which leads to a significant reduction in the outlet noise. |
Sound enclosure construction |
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The basic structure of the acoustic enclosure is an aluminium plug-in profile frame into which the service doors around the system are integrated. The service doors around the system can be easily removed with a tilt dimension of 6 cm and allow unhindered access for service and maintenance work on the systems. They are installed on a level concrete foundation in the basic dimensions of the acoustic enclosure.
The service doors are based on 1.5 mm thick aluminium panels with 40 mm thick Stratocell® Whisper insulation on the inside, which has some of the best sound-absorbing properties available on the market. As the laminated polyethylene foam absorbs noise and does not reflect it, it is an excellent alternative to many of the noise protection materials used today. The insulation is also moisture-resistant, does not build up mould, can be rinsed with a high-pressure cleaner and complies with fire protection class: B-S2-d0 (flame retardant). The air openings and the free air inlet openings are designed at around 7% above the required air volume of the system. The air routing is offset to the side so that no air short circuit can occur between the exhaust air and supply air. |
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Alluminium base frame adaptable to all system sizes, required air volumes and installation situations 2) Service doors around the units with a tilt dimension of 6 cm 3) Roof panels with a tilt dimension of 6 cm for unrestricted access to the fans. The roof panels are designed for a load of 160 kg/m2 4) Air chamber separation and freely selectable air routing |
Project-specific acoustic enclosures for large systemsLarge heat pumps and air- and water-cooled refrigeration systems |
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Large heat pumps and air- and water-cooled refrigeration systems
Thanks to the modular design, individual modules up to 6 metres in length and width and a height of around 3.5 metres can be easily realised. Larger systems or several systems can also be equipped with a sound enclosure by combining individual modules. Attachments for pipework, electrical cabinets or simply for escape routes can also be realised. Customised products for the following situations: 1 ) Enclosure of several systems, even with different dimensions. 2 ) Various combinations of air ducting. 3 ) Heat recovery. 4 ) Combination with pre-cooling |
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Free choice of RAL exterior colour for your acoustic enclosure |
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I would like to find out what colour a physical object is (example facade) How do I do this?
We recommend comparing the colour of the object with the colour samples in a physical colour fan. Please note that it may also be a RAL colour or a colour from another colour system used by a specific paint manufacturer, for example. You should also bear in mind that the colour on the object may have faded over time. RAL offers an electronic device that determines a RAL colour by "scanning" the object. |
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