Dust in desert climates such as parts ofthe Middle East and lndia, the air is loaded with abrasive dust (silica), and dust storms can be a particular ctuhrablilneeng-eb.e(cHaeuasteishoatlsao an issue that affects the efficiency of the ir is less dense, less power is generated for a given volume of air.) Donaldson recommends using self-cleaning (otherw 'Donaldsisoen kGnDowXn'). aTshipsutlesceh-cnloelaongiynggr) efailltelyr esxytsetnedmssth(seulcifhe oafsfılters (especially in dry and dusty environments) by keeping excessive ammaoi nutnatisn i nogf paarloticwulparteesfsruorme bduroi lpd i nagcruopsosnththeefifltilelersr . m e d i a , thereby Moisture/fog Another problem that can affect turbine filtration is moisture -particularly fog. Coastal locations often experience problems with humidity. Here, the surface condition of the filler media used is very important, because clean filters will tolerate moisture much betler than dirty filters. in locations that have extended periods of fog (such as the Pacific t Na h o e c r o t U h a w K le e ) s , s c D t e o ir n n f o t a h r ld e f s r e U o e S n , m o a f o s fe i s w r t s u e r a l e l . a ' psr el o- fci lat et iro' npsr oi nd ut ch et cMa il dl eddl e' DE-aFsotg, ' l nt hdai at aacntds a s in addition, a 100% synthetic media filler ibsegcea nues er atl lhyeref ıcl toe rmsmr eesni sdte dm fooi srt iunrset abl el attlieorn t ihnatnh ebsl een deen vd i rmo nemd ieanftisl t,e rbso tahn d because the physical properties of the synthetic media are less scuysccleesp.tible to degradation when they are exposed to repeated wet-dry SELECTING THE RIGHT FILTER MEDIA The heart of the filler system is the filler medium. Some filler manufacturers invest heavily in researching, developing and fine-tuning their media formulations so I that they will achieve optimal results for a variety of filtration challenges. Figure 2 illustrates various filtration mDoencahladnsiosnm'ss.' S pider-Web' technologies, for example, consists of a fıne fwilleebr omfesduiab.-mThicirsonnadnioafmeter fibres bonded to a substrate of Donaldson ibre layer significantly improves the ability of the mo fepdai ar t itcol ecsotl hl eactt pdeu nset tpr aatret i ci nl et so ot hnei tdsesput rhf aocfet haen dm me di ni ai mai zn ed si ntthoe t hneu m b e r t'Durubraintee.k' filler media is that company's proprietary blend of natural and saymnbthieentitcafirıbfrieltsradtieosn,iganleodngtowpithrogvoidoed ampopirsotpurrieatreesphysical properties for istance. Donaldson also offers a 100% synthetic filler media that is formulated with smaller and smoother fibres to achieve higher-efficiency filtration in a variety of envi W pe h rf e or n o r m n e m a v n a e c l n u e t a s t o . i n f gfilfteillresr coapnt i ovnasr,yitsiisgni mifıcpaonr ttalyn, taton dreitcoisgnreizceo mt hma tetnhdee d that cmoamnupfaarcistournesrsb.eHmowadeevebr,etuwnel en reports on filters from different ike liquid and hydraulic filters, air filters are not rated by micron efficiency, but rather in the US by ASHRAE. (American Society of Heating, Refrigeration and Air-Conditioning Engineers) standards, and it is best to use independent test laboratory reports, such as ASHRAE 52.1, as a basis of comparison. Specifıc comparisons should be made on efficiency and pressure drop characteristics between alternatives to determine how similar the filters sr ehaol luyl da rbee. Ap a rctoomf ptah irsi s oe nv aol uf at ht ieo ne, faf i cs i ennecwy foi l fl enr eewf f i ac inedn cci el esa na r ef i l t ev er sr y important in the overall efficiency rating of any filler. However, care must Decisions on which air filters to use are not always easy ARTICLE / MAKALE c ba o e ir m f l lo a p w k a e r ( en + d w1 0 w h % e e r n ) e a c m n o d m a dp u e s a roi nngt ht ees ts ad amlea ftiol l eerncsounr ef i gt hu raat tti oh nest, easti st hbee si nagm e ing the same test dust. Diseucnisiqiounes-oonpewrhaitcohrsaoirf foiltneerssto use are not always easy. Each situation ite might fınd !hat a filler selection makes economic sense for their application, while another plant in a similar environment, but with different operating circumstances, might select a e n v o a t lu h a e t r filler. Make sure to compare 'apples with apples', not only when ing filters from different manufacturers, but also when evaluating different filler products of the same manufacturer. WHEN TO CHANGE FILTERS? A question !hat filler manufacturers are commonly asked is, 'when scuhsotuoldmewres crehaalnge our filters?' The answer is more complex than most ize. i n some cases, filters might look dirty, which indicates that the filters have been successful in capturing particulate. However, experience shows that sometimes filters can look cleaner simply because they are collecting light-coloured, rather than dark-coloured dust. The only way to sl ..... t..,,�� �-�� •-� '� •'i ;:-Q-,ı.ıi�Ö: -:t • , ENERJi & KOJENERASYON DÜNYASI 61
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