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| | | 08 | | |
| | Noise reduction as exemplified | |
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| | | blades, as well as the hub ratio, to the particular requirements of this application. The entire system was tested and designed in accordance with railway regulations. Impact loads of 5 g in all directions were easily compensated for. | | |
| | | In this case, the ATB SILENCE system was used to cut noise emissions by 10 dB(A)-1m. This successfully "silenced" the excessively loud air conditioning unit mounted on a railway carriage roof. ATB designed and produced a special housing to achieve this notable noise reduction, using non-woven, insulation material and perforated metal sheet. Measurements on the company chamber test stand were employed to optimise both the profiles and number of ventilator | | |
| | | Noise emission | | |
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| | | 95 90 E 85 | | |
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| | | 80 75 70 65 1,400 | | |
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| | | 1,600 1,800 2,000 2,200 Speed [min-1] | | |
| | | 2,400 | | |
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| | | The challenge was to produce a booster fan for the transport of the waste gases from firing plants. The technical demands included media temperatures of up to 500 °C, low flow resistance even when stationary and a minimum power requirement. These targets were all achieved in impressive fashion by means of an intelligent combination of suitable materials (austenitic steels), hot bearing grease and heat baffle plates. | | The innovative technology used, guarantees minimum through flow resistance even during standstills, which means that the system can be switched off once a sufficient draught has been created in the flue. This results in enormous annual energy savings. Measures aimed at matching performance to the boiler such as voltage control or motor pole reversal also guarantee top efficiency during partial load operation. | | |
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| | | Electrical power requirement | | |
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| | | 200 175 150 125 100 75 50 | | |
| | | tu I 0. | | |
| | | Wood fired boiler | | |
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| | | 0 50 100 150 200 250 300 350 400 Flue gas volume [m3/h] | | |
| | | 450 | | |
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