Silikon silen we i save ron long en bilong stretim ol sola modul beksit we i bagarap

Wanpela risets tim bilong Czech-Austria i kamapim wanpela gutpela 'polysiloxane gel' we inap long stretim ol 'solar module backsheets' we i bagarap pinis, na stretim ol 'insulation properties' bilong en na mekim ol 'photovoltaic' (PV) sistem i wok longpela taim moa. Dispela nupela rot bilong stretim hevi i stretim wanpela bikpela hevi we ol sola plent opereta i bungim, long wanem, 'backsheet degradation'-moa yet long ol 'modules' we ol i wokim long 2010-planti taim i save kamapim ol wari long sefti na bikpela lus long eneji prodaksen.

Ol risetsa i yusim wanpela spesel 'polysiloxane gel', we ol i wokim wantaim kampani bilong wokim silikon, Siltech Solutions, we i stap long Czech-, we ol i save yusim olsem wanpela 'encapsulation auxiliary' bilong ol PV modul. I no olsem ol strongpela samting bilong stretim ol samting, tim i senisim dispela gel na bai em i ken ron gut, na dispela i mekim na em i inap long pulapim ol liklik bruk na kamapim wanpela gutpela 'protective layer' antap long ol 'backsheets' we i bagarap. Dispela gel i gat wanpela silikon-bes polima matriks, we ol i strongim wantaim 'fumed silica' olsem wanpela 'filler' bilong strongim strong bilong en, na wanpela 'moisture-curing agent we i mekim em i kamap strong taim em i stap long win na humidity.

"Moisture-initiated curing process i save kamap long pes i go ausait, wantaim gel i save kamap strong isi isi taim wet i go insait long samting," ol risetsa i tok. "Taim em i kamap orait olgeta, gel i kamapim wanpela 'flexible elastomer' wantaim gutpela 'tensile strength' na 'elongation properties', na i save mekim strongpela 'adhesion' long olgeta 'backsheet materials-na tu ol dispela we i gat bagarap o ol samting i no stret long pes bilong en." Dispela 'adhesion' em i bikpela samting long stopim wara long go insait, we em i nambawan as bilong bagarap long 'backsheet' na 'insulation' i no wok gut.

 

Test long ol samting bilong beksit

Ol i bin testim polysiloxane gel pastaim long faivpela kain beksit materiel, we i soim ol kain kain komponen we ol i bin yusim long ol PV modul long laspela tenpela yia: co-extruded polyamide (AAA beksit); polyvinyl fluoride (PVF)-PET bilayer; polyvinylidene fluoride (PVDF)-PET bilayer; primer-coated PET; na wanpela nupela ethylene tetrafluoroethylene (ETFE)-based composite. Ol i makim ol dispela samting bikos ol i save yusim planti taim na ol i save olsem ol inap bagarap bihain long sampela taim.

Ol i katim ol 'rectangular' sempel (3cm bikpela, 12cm longpela) long wanwan kain 'backsheet', na ol i putim 'gel' long sait bilong wanwan 'strip' we i gat win. "Wanpela namba tu 'backsheet strip', sait bilong win i go daun, antap long 'gel-coated sample na presim isi isi long kisim wankain gel tiknes bilong samting olsem 1.2mm," tim i tok klia. "Ol i rausim planti gel long ol arere, na ol i kukim ol sempel long 25 digri Selsias na 55% relatif humiditi inap 30 de. Bihain long ol i kukim, ol i putim ol sempel long hariappela 'aging' insait long wanpela 'climate chamber' long 85 digri Selsias na 85% relatif humiditi inap long 1,000 aua {PV} standet tes strong bilong ol samting."

Post-test analisis i soim olsem gel i soim gutpela 'adhesion' long olgeta faivpela kain 'backsheet', wantaim 100% 'cohesive failure' i kamap long olgeta sempel. Dispela i soim olsem 'bond' namel long 'gel' na 'backsheet' i strong moa long 'gel' yet, na dispela i soim olsem 'gel' inap longpela taim na i no inap long 'delamination'.

 

Test long 8-yia-olpela panel we i bagarap pinis

Bihain, ol i testim gel long ol lapun PV modul wantaim AAA beksit we i bin wok inap long 8-pela yia na i soim ol bikpela mak bilong bagarap, wantaim ol bikpela bruk antap long ol sel busbar na pes bilong en i bruk bruk. Ol i putim gel i go stret long ol baret wantaim wanpela 'precision cartridge', na bihain ol i spredim wankain long olgeta hap bilong baksait wantaim wanpela bikpela 'spatula' bilong wokim wanpela 'protective coating'. Ol i putim ol modul we ol i stretim pinis insait long wankain 'climate chamber' inap long 1,000 aua bilong 'damp heat treatment'.

Ol skelim we ol i kisim bihain long ol i kamap lapun i soim olsem ol bruk i pas gut na i no moa stap ples klia, na ol modul we ol i stretim i kisim ol insulesen resistans veliu antap long 200 MΩ-we i winim tru sefti rikwaemen bilong PV modul operesen. "Maski bihain long ol i bin mekim 'accelerated damp heat test', ol 'modules' i bin holim gutpela 'insulation' pefomens na ol i bin winim 'wet leakage test' na i no gat sain bilong wara i go insait," ol risetsa i tok. Dispela i soim olsem gel inap long stretim bek ol bikpela sefti na pefomens metriks long ol 'aging modules'.

 

Test long operesenel sola plent

Long skelim gut pefomens bilong wol, risets tim i bin yusim dispela teknik bilong stretim long wanpela 10MW sola plent long Czech Republic, we planti modul i bin kisim bagarap long 'backsheet'. "Ol i putim 'polysiloxane gel' long fil na ol i no brukim ol 'modules-' we ol i kisim long wanpela 'hanheld cartridge' na ol i mekim 'backsheet' i kamap gutpela wantaim wanpela 'spatula'," tim i tok strong. "Ol i larim ol modul we ol i stretim pinis long wok aninit long ol kondisen bilong wol inap long tripela mun, na ol i stap long ol kain kain tempereja, humiditi, na UV rediesen."

Ol 'wet leakage' tes we ol i bin mekim bihain long 'field trial' i soim olsem ol 'repaired modules' i gat bikpela 'insulation resistance' na i wok gut, na i no gat drop long eneji autput taim yumi skelim wantaim ol 'module' we i no bagarap. "Ol risal bilong wok painimaut i soim olsem dispela gel i save strongim wok bilong ol modul, tasol ol i mas mekim longpela taim tes long sampela yia long skelim gut strong bilong en," ol risetsa i tok. "Wanpela bikpela askim i stap yet em sapos 'backsheet' we ol i stretim pinis inap long wankain wok bilong 'moisture barrier' bilong 'original' longpela taim, moa yet long ol hap we weta i no gutpela tumas."

Ol i bin pablisim dispela risets insait long pepa "Field-applicable polysiloxane gel repair for degraded photovoltaic module backsheets" insait long Journal of Photovoltaics Research. Risets grup i gat ol saientis bilong Siltech Solutions Czech Republic, Austrian Research Institute for Chemistry and Technology (OFI), na Czech Technical University long Prague- we ol i wok bung wantaim long kamapim ol rot bilong lukautim PV we i no gat bikpela pe na i no gat bikpela pe.