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Large heat pumps are particularly suitable for use in industry, in municipal infrastructure or in large residential, commercial and commercial buildings. While heat pumps for use in private residential and commercial buildings are now standard heating technology and the use of condensing technology is increasingly being pushed back, there is still great potential in the broad application of large heat pumps and industrial heat pumps in the power range from 200 kW to > 1,000 kW. But their areas of application already show the way that the mostly with multi-stage compressors and high air volume, meet the quiet needs of the residents in the dense construction in cities. Our modular sound hoods can help here, by combining several modules, practically all mooring sizes can be equipped with a sound hood. The picture shows a sound hood for a heat pump with a heating capacity of 120kW and a cooling capacity of 315kW installed in our warehouse before shipping. The system has 5 axial fans with an air volume at full load operation of 85,000 m3/h. The dimensions of the system are 3,600 x 2,250 x 2,320 mm (L x W x H). The acoustic hood has the following dimensions: 5,000 x 3,300 x 3,100 mm (L x W x H). The acoustic hood is designed for an air flow rate of 92,000 m3/h and brings a noise reduction of 18 - 20 dB(A) at a distance of 1 meter, measured according to the enveloping surface method.   
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The heat pump has the following dimensions: 950 x 940 x 417 mm (L x D x H), the maximum air volume of the system is 3,300 m3/h and is achieved by an axial fan with a maximum static pressure of 20 Pascal. The appropriate acoustic hood Silent-Mode Model-H3 and has the dimensions: 1'600 x 1000 x 1'400 mm (L x D x H) The sound hoods has a maximum air throughput of 4,200 m3/h and were produced in the desired RAL color (in this case bi-color). The acoustic hoods enable a maximum combined noise reduction of between 17 and 20 dB(A) through targeted airflow in combination with insulation to prevent masking effects and reflected noise. Service doors around the systems allow unimpeded access for service and maintenance work. Internal "air separation" prevents an air short circuit between the air inlet and air outlet. The acoustic hood consists of aluminum system profiles with a thickness of 5 cm and aluminum panels with powder coating of your choice with a thickness of 1.5 mm with internal weather-resistant insulation based on sound-absorbing polyethylene foam panels with a thickness of 40 mm. Due to its sound-absorbing properties, this foam is one of the most innovative sound control materials in the industry. The material is water, UV and dimensionally stable and does not build up bacteria (fungus) and is completely recyclable. For more information: info@silent-mode.com  1 = Side view of air outlet Image
2 = Front view without service doors with a view of the air separation between air inlet and air outlet Image 3 = View of the closed service doors on the back of the system 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      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  |
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
July 2023
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