Solar Thermal Conversion Using All-Glass Evacuated Tubular Collectors for Greenhouse

摘要

Experimental study of greenhouse with heat loss coefficient 8.37W/m2℃ solar heating during the winterwas conducted by a 360m~2 all-glass evacuated tubular collectors. Indoor temperature was kept at around5℃. In the Beijing area of China, where minimum outdoor temperature between mid-December 2000 andmid-February 2001 was lower than -6℃, the average active solar heating ratio was around 10%. However,this figure was raised to 26% beyond that period of time when the minimum outdoor temperature was -4℃.