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Initial position Both projects involve enclosing 2 Samsung inverter outdoor units that have already been installed. The systems each have two axial fans with a maximum air volume flow of 7,200 m3/h (full load). The static pressure of the fans is a maximum of 20 Pa. The system is located in the Swiss canton of Bern. Acoustic enclosure concept The basic structure of the acoustic hood is an aluminum plug-in profile frame, the service doors around the system and in the roof are integrated into this profile frame. The acoustic hood was installed on site without screws by simply plugging the prepared modules together. To protect against high wind loads at the exposed position, the corner connectors were also screwed on so that the sound hood remains in position even with hurricane force. The service doors are based on aluminum panels with a thickness of 1.5 mm with internal 40 mm thick insulation made of Stratocell® Whisper, the material has one of the best sound-absorbing properties available on the market. Because the laminated polyethylene foam absorbs sound and does not reflect it, it is an excellent alternative to many soundproofing materials used today. The insulation is also moisture-resistant, does not build up mold, can be rinsed off with a high-pressure cleaner and corresponds to the fire protection class: B-S2-d0 (hardly inflammable). Acoustic enclosures dimension The base frame for accommodating both systems has the following dimensions: 2,900 x 1,450 x 1,800 mm (L x W x H) with a weight of 140 kg. The sound hood was made entirely of aluminium. Airflow Due to the small distance between the condenser and the wall, the supply air enters from the side at the rear. The air outlet is at the front and upwards with an air deflection of 90°. The acoustic hood is designed for an air flow rate of 15,000 m3/h. The ~air outlet velocity is 1.69 m/sec. so that we hardly transmit any sound. Noise reduction and pressure drop The all-round noise reduction across the frequency spectrum from 63 to 8,000 Hz is between 15 and 16 dB(A), with a pressure loss of < 15 Pa. air short circuit An air short-circuit between the warmer air entering and the colder air outlet is avoided by using a partition made of plastic plates with a high rubber content located at the front edge of the units. With this partition, the air chambers are hermetically separated. The high rubber content of the plate means that no vibrations from the systems are transmitted to the sound hood frame. Right next to the cascade sound hood is one of our sound hoods for a Samsung VRF system, which was designed according to the same concept. For more information: info@silent-mode.com     
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Outdoor swimming pools in the private sector are booming, which means that more and more pool heat pumps are being used. These are then usually in the quiet zone around the pool and often also in the vicinity of the neighboring property. Attention pool heat pumps, also known as quiet inverter heat pumps, cause noise like a heat pump that is used to heat the living space. We are therefore experiencing a great demand for sound hoods (Acoustic Enclosure) for pool heat pumps and often also for pumps and filter systems. With the use of a sound hood, the noise emissions of a pool heat pump can usually be reduced by between 16 and 20 dB(A). Since the color of the sound hoods can also be adapted to the environment and the roof can also be greened, this is another advantage when it comes to integration into the environment. We are at your disposal for further information info@silent-mode.com  Pool Heat Pump enclosures for all Makes and Sizes  Pool Heat Pumps ready for delivery lanning principles The planning of our sound hood is based on the following principles: 1. The smallest possible size of the sound hood 2. Modular expandability 3. Highest possible sound insulation 4. Avoidance of system performance losses 5. Unhindered access for service and maintenance 6. Relocation of the air inlet to the shady side of the system lower delta T) Outlet refrigeration system The system has a maximum cooling capacity of 59.7 kW and uses an axial fan to move an air volume of 19,584 m3/h at maximum capacity. The system has 2 scroll compressors with 1 refrigeration circuit. R410A is used as refrigerant. System sound pressure level The sound pressure level at a distance of 10 meters from the system is 50.3 dB(A) according to ISO3744:210, with a sound power level of 81 dB according to UIN EN ISO 9614. Sound hood concept Aluminum frame construction to accommodate soundproof aluminum service doors for air outlet and air inlet and integration around the system. The acoustic hood is designed for an air volume of 20,100 m3/h, the system can be operated in the acoustic hood without pressure loss. The basic construction has the following dimensions: 1'700 x 1'700 x 2'635 mm (L x W x H) Service doors with internal 40 mm thick sound insulation are integrated around the systems. These service doors are equipped with quick-release fasteners that can be easily removed by one person. In this way we ensure unhindered access for service and maintenance work. The insulation material offers high sound insulation over the entire frequency spectrum. The insulation is also water and UV resistant and does not build up bacteria and fungi. The insulation also corresponds to the highest fire safety class. Advantages of the sound hood All-round high sound reduction between 18 and 20 dB(A). Protection of the systems against weather influences (direct sunlight, rain, hail, wind. Unrestricted access to the facilities for service and maintenance work. Material All components of the acoustic hood are recyclable Location STRESA Italy www.silent-mode.net The Mitsubishi Air Sourec heat pump series SHW112YAA has the following dimensions: 1,050 x 480 x 1,020 mm (W x D x H). The system on the image was set up at our test site prior to shipment to the customer. The system has an axial fan with a maximum air flow rate of 4,800 m3/h. sound hood concept The basic structure of the acoustic hood is an aluminum plug-in profile frame, the service doors around the system and in the roof are integrated into this profile frame. The service doors are based on aluminum panels with a thickness of 1.5 mm with internal 40 mm thick insulation made of Stratocell® Whisper, the material has one of the best sound-absorbing properties available on the market. Because the laminated polyethylene foam absorbs sound and does not reflect it, it is an excellent alternative to many noise control materials used today. The insulation is also moisture-resistant, does not build up mold, can be rinsed off with a high-pressure cleaner and corresponds to the fire protection class: B-S2-d0 (hardly inflammable). The base frame of the acoustic hood has the following dimensions: 1,700 x 1,100 x 1,400 mm (L x W x H) with a weight of 90 kg. The entry of the supply air at the rear can be on the right or left. The air outlet is mirrored traffic on the side in front. The acoustic hood is designed for an air flow rate of 5,100 m3/h. The average air outlet speed is 1.7 m/sec. so that we hardly transmit any sound. Details acoustic hood Noise reduction The all-round noise reduction across the frequency spectrum from 63 to 8,000 Hz is between 19 and 21 dB(A). Adaptation to the environment The acoustic hood is made entirely of aluminum and produced in the RAL color of your choice. External dimensions: 1'100 x 420 x 1'200 mm (L x W x H) Maximum air volume Heat pumps Heat Pumps: 4'200 m3/h Air Conditioning: 3'500 m3/h VRF/VRV systems: 3'500 m3/h Pressure loss through the sound hood about 18 pascals RAL Color Manufactured in Black Material Completely made of aluminum isolation 40 mm thick, the insulation is flame retardant and corresponds to fire class EN 13501-1 B-s2-d0 DIN4102: B1  The outdoor unit of the tabletop evaporators only consist of the condenser and the fans, the compressor is located in the interior. The challenge was to eliminate airborne noise in a high frequency range. Since the systems are on/off systems, they run continuously on the maximum air volume of 10,300 m3 / h. Each unit each has the following dimensions: 2,006 x 956 x 1,268 mm L x W x H. The systems are mounted next to each other with a small gap. The acoustic enclosure for the 2 systems has the dimensions: 2,006 x 956 x 1,268 mm (L x W x H). The hood was built to accommodate 2 table top evaporators and is 2,600 x 3,100 x 1,500 mm (L x W x H). The sound reduction measured according to the enveloping surface method is 15 to 16 dB (A). The acoustic hood is made entirely of aluminum. The basic construction is an aluminum plug-in system that is easy to assemble. Service doors were installed around the system, which allow unrestricted access to the system for service and maintenance work. The inside of the acoustic hood is covered with 40 mm thick insulation (Stratocell Whisper). The air inlet is guided at the bottom and blown out on the long sides at the top. An air short circuit is avoided by a transnorm sheet that separates the air chambers. The sound hood was set up on our premises before shipping and we loaded it pre-assembled so that it can only be lifted over the system like a hat on site. For more information: info@silent-mode.com  Acoustic enclosure for a Mini VRF system U-5LE2E8 installed on a flat roof near Frankfurt am Main.21/8/2021 Starting position A "Panasonic Mini VRF system U-5LE2E8" was installed on an intermediate roof between two single-family houses near Frankfurt. The system has the following dimensions: 980 x 370 x 996 (+ 200 vibration dampers) mm (W x D x H). At maximum output, the system has an air volume of 4,320 m3 / h, the static pressure of the fan is around 15 to 20 Pascal. When planning the acoustic hoods, we assumed a static pressure of <15 Pascal. By means of the acoustic hood, the noise level is reduced to the neighborhood, the next window is around 7 meters away from the acoustic hood. Acoustic hood concept The air inlet is at the rear (condenser side towards the roof). This enables us to achieve an even air flow to the condenser without causing a pressure loss due to excessive air deflection. The air outlet is on the front side (fan side), front left. A deflector plate was also installed here at the air outlet, which ensures the air outlet speed of 1.4 meters / sec. continues to insulate. In this way, we achieve a continuous flow of exhaust air without creating an air short circuit. With an air outlet speed of around 1.4 m/sec. hardly any sound is transmitted via the air outlet. The basic structure of the acoustic hood is based on aluminum system profiles which have the advantage of being light in weight when mounted on the roof. Around the system as well as in the enclosures roof, aluminum sheets were installed as easy-to-open service doors with a thickness of 1.5 mm with internal 50 mm insulation made of closed-cell, semi-rigid and sound-absorbing polyethylene foam sheets (Stratocell Whisper). Due to its sound-absorbing properties, this foam is one of the most innovative materials for sound control in HVAC systems. The insulation is UV and water resistant and non-flammable. The isolation does not build up bacteria or fungi. And has strong sound insulation across all frequency bands. In this way we prevent masking effects that often occur when eliminating high-frequency sound bands and which lead to an increase in the tonality of the compressor sound. The insulation is also light and hardly increases the weight of the service doors. Sound hood dimensions The acoustic hood has the following dimensions: 1,700 x 1,300 x 1,100mm (W x H x D) / weight including service doors 127 kg. The acoustic hood is made entirely of aluminum and was subsequently powder-coated in RAL color 7016 to match the color of the roof. Sound reduction between 18 to 20 dB (A) |
AuthorOur unique Environmental Enclosure systems provide a complete package solution for larger HVAC equipment, where noise and visual constraints are an issue on your project. Archives
June 2022
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