%0 Journal Article %T Effect of Fresnel lens as cover in a passive solar water heater with some air gap between cover and absorber plate %A Handoyo, Ekadewi A %A Bisono, Indriati Njoto %A Jonathan, Peter %A Valentio, Dio %J IOP Conference Series: Materials Science and Engineering %V 740 %N 1 %P 7 %@ 1757-8981 %D 2020-01-01 %~ DeepDyve