European Project Semester at ISEP - EPS@ISEP

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report [2011/05/31 20:13] – epsg1wikireport [2011/05/31 20:18] (current) – epsg1wiki
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 In evaporative humidifiers mist is produced by blowing water through a wick filter with the use of a fan. The mineral dust and bacteria get trapped on the filter before the water evaporates into the air. The advantage of this kind of humidifier is that wick filter ensures a pure and clean mineral-free moisture output. Moreover, fans can be powerful enough to cover large areas with a single humidifier. And the power consumption is very low. This solution has also some disadvantages, like fact that fans make more noise than other types of humidifiers (noise level depends on fan speed).What is more bacteria and mold can grow on wick filter very easily, however it may be reduced by using a bacteria treatment water additive, but still most wick filters need to be replaced approximately every 2 months. In evaporative humidifiers mist is produced by blowing water through a wick filter with the use of a fan. The mineral dust and bacteria get trapped on the filter before the water evaporates into the air. The advantage of this kind of humidifier is that wick filter ensures a pure and clean mineral-free moisture output. Moreover, fans can be powerful enough to cover large areas with a single humidifier. And the power consumption is very low. This solution has also some disadvantages, like fact that fans make more noise than other types of humidifiers (noise level depends on fan speed).What is more bacteria and mold can grow on wick filter very easily, however it may be reduced by using a bacteria treatment water additive, but still most wick filters need to be replaced approximately every 2 months.
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 Fig. 1. Evaporative humidifier. Hot air goes through a wet filter causing the increase of humidity and decrease of temperature. Fig. 1. Evaporative humidifier. Hot air goes through a wet filter causing the increase of humidity and decrease of temperature.
  
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 In impeller humidifiers there is a fan, which blow water through a diffuser and as a result it produces fine droplets. In contrast to evaporative humidifiers there is no filter, so there is no need to replace it what make cost of maintenance much lower. Moreover it is very quiet while working. Additionally there is low power consumption and these humidifiers are cheaper than evaporative humidifiers. On the other hand there is risk that bacteria and minerals can spread in the air along with the mist, what may cause white dust. It is also limited to small rooms only. In impeller humidifiers there is a fan, which blow water through a diffuser and as a result it produces fine droplets. In contrast to evaporative humidifiers there is no filter, so there is no need to replace it what make cost of maintenance much lower. Moreover it is very quiet while working. Additionally there is low power consumption and these humidifiers are cheaper than evaporative humidifiers. On the other hand there is risk that bacteria and minerals can spread in the air along with the mist, what may cause white dust. It is also limited to small rooms only.
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 Fig. 2. Impeller humidifier. Air is blew by fan with a use of diffuser Fig. 2. Impeller humidifier. Air is blew by fan with a use of diffuser
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 Tab.  1. Table with points for each humidifier. 5 is the best, 1 is the worst. Tab.  1. Table with points for each humidifier. 5 is the best, 1 is the worst.
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  Ultrasonic humidifier Evaporative humidifier Humidifier with the air compressor Impeller humidifier  Ultrasonic humidifier Evaporative humidifier Humidifier with the air compressor Impeller humidifier
 Cost 3 5 1 3 Cost 3 5 1 3

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