Solar heating design, by the f-chart method 2026-02-15T22:41:57+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Beckman, William A.; Duffie, John A.; Klein, Sanford A., 1950- (Wiley, 1977)