... ) More energy output from a unit area, less roof occupied;(2) Plate-grid structure, fluid heated in the copper pipe with ... building;(5) Stable quality, free maintenance and long life span.2. Advantages of DAILY flat plate solar collector(1)Blue titanium ... coating, with high absorptivity 95±2% and low emissivity 4±2%, stable performance, life span 50years;(2)Special design structure, 360°heat ...