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ratio of the useful heat energy gain over a time period to the incident solar radiation over the same time period, kasuliku soojusenergia juurdekasvu ja langeva päikesekiirguse suhe samal ajavahemikul
kollektoriahela kasutegur . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/kollektoriahela%20kasutegur/1/est (20.07.2026)
