{"version":"1.0","type":"link","title":"Selective surface - Newikis","description":"In solar thermal collectors, a selective surface or selective absorber is a means of increasing its operating temperature and/or efficiency. The selectivity is defined as the ratio of solar radiation absorption (αsol) to thermal infrared radiation emission (εtherm).","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/c/c8/Col%C2%B7lectors_solars_de_tub_de_buit.JPG/1280px-Col%C2%B7lectors_solars_de_tub_de_buit.JPG","thumbnail_width":1280,"thumbnail_height":741}