HVAC magasinet Nr. 1 (2010) Page 34

<h1>HVAC magasinet Nr. 1 (2010) Page 34</h1>I n t e r n a t i o n a l f o r s k n i n g Ventilation filters... 10% overnight; and (3) continu- Fortsat ous 100% operation. Outside air passed through the samples and the acceptability of the air downstream of the filter was assessed by a panel of subjects. The results indicate that turning off the ventilation system or reducing the airflow outside working hours would significantly increase the sensory pollution emitted by a filter imme- of outdoor suburban air. The tested filter combinations were: 1) F7 fiberglass bag-filter; 2) F7 fiberglass filter protected by monthly exchanged F4 prefilters; 3) F7 fiberglass filter with an activated carbon filter upstream; 4) F7 fiberglass filter with an activated carbon filter downstream; tions. The airflow through the filters was adjusted to 1300 m3/ h to achieve a standard 2 m/s face velocity through the filters. After 5 months of soiling, the filters and the test plenums were moved in the laboratory. Human subjects assessed the acceptability of air downstream of each set of filters in a controlled laboratory environment. The obtained values of accept- However, economic losses resulting from even a small decrease in productivity caused by sensory pollutants emitted from used ventilation filters have the potential to substantially exceed the annual economic benefits of filtration. Further studies are required to determine if meaningful benefits can be obtained from more frequent filter replacement or application of different filtration techniques that limit the emission of offending pollutants into the ventilation air. Engineering solutions Today, we know more about the hazardous effects of very fine particles and about the importance of good and healthy indoor air. Recommendations and guidelines to use more efficient filtration techniques are thus increasing. HVAC systems should thus be well maintained and the filter banks should be regularly exchanged. Attention should be also given to hours of operation of the ventilation system. This was investigated in an experiment performed to determine whether the sensory pollution emitted from a bag filter that had been used for 3 months in a suburban area in Denmark was influenced by different ways of operating the air-handling unit. Samples of the used filter were preconditioned to simulate three operating conditions: (1) switched off overnight; (2) airflow reduced to 34 Figure 2. Percentage of people dissatisfied with the air quality downstream of eight different filters or filter combinations. Both new filters and filters of the same type after 5 months of continuous operation were tested. diately after the ventilation system is turned on, in comparison with continuous airflow through the system. After outside air had passed through the filter for 2 hours, no significant differences were found. Development of low-polluting filtration techniques with higher efficiencies and lower pressure drops is another way forward. Until such techniques are developed, filters that pollute the air the least after a substantial period of operation should be selected among the commercially available products. Our latest experiments evaluated the net effect that different bag filters, activated carbon filters and their combinations had on perceived air quality after five months of continuous filtration 5) F7 fiberglass filter with an activated carbon filter both upstream and downstream; 6) Stand-alone combination filter: bag-type fiberglass filter that contained activated carbon; 7) Stand-alone combination filter: synthetic fiber cartridge filter that contained activated carbon and 8) F5 fiberglass filter. Eight test plenums were assembled to evaluate the various filter types or their combinations. The test units with a cross-sectional area of 0.3 x 0.6 m were situated outdoors. They consisted of a fan, filter housings and ductwork. The plenums with the various filters were in continuous operation for 5 months under identical condiwww.lindab.dk ability of air were then converted to percentage of people that would be dissatisfied with the given air quality (figure 2). Air that had passed through used filters was most acceptable for those sets in which an activated carbon filter was used downstream of the particle filter. Comparable air quality was achieved with a stand-alone combination filter - bag-type fiberglass filter that contained activated carbon. Furthermore, the pressure drop of the combination filter changed very little during the five months of service, and it had the added benefit of removing a substantial fraction of ozone from the airstream. Used combination filters tended to provide air quality that was HVAC 1 · 2010 Bedre indeklima. Nu! <a title="HVAC magasinet - Nr. 1 (2010) - Page: 52" href="http://techmedia.swiflet.com/tm/hvac/37/52/">HVAC magasinet - Nr. 1 (2010) - Page: 52 : KVIK BUTIK Vi har lavet et ventilationssupermarke</a>HVAC magasinet - Nr. 1 (2010) - Page: 52 - content: KVIK BUTIK Vi har lavet et ventilationssupermarke <a title="HVAC magasinet - Nr. 1 (2010) - Page: 51" href="http://techmedia.swiflet.com/tm/hvac/37/51/">HVAC magasinet - Nr. 1 (2010) - Page: 51 : M e s s e - o g k o n f e r e n c e o v e r </a>HVAC magasinet - Nr. 1 (2010) - Page: 51 - content: M e s s e - o g k o n f e r e n c e o v e r <a title="HVAC magasinet - Nr. 1 (2010) - Page: 50" href="http://techmedia.swiflet.com/tm/hvac/37/50/">HVAC magasinet - Nr. 1 (2010) - Page: 50 : F a g t e k n i s k e k u r s e r o g m ø</a>HVAC magasinet - Nr. 1 (2010) - Page: 50 - content: F a g t e k n i s k e k u r s e r o g m ø <a title="HVAC magasinet - Nr. 1 (2010) - Page: 49" href="http://techmedia.swiflet.com/tm/hvac/37/49/">HVAC magasinet - 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