... for commercial solar water heating applications.Solar Collector Work Principle:1) The operation of the solar collector is very simple. 2) Solar absorption: solar radiation is ... *190 1*1945*355*2752*1945*355*275CertificateEN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK,SRCC,EN12975-SOLAR KEYMARK ...