Solar heat collector - with concentric plastic tubes transparent on outside and ribbed black on inside

摘要: A solar heat collector consists of a series tubes which carry the fluid to be heated. Each tube is assembled from an outer tubular sheath, pref. made extruded transparent acrylic resin, and inner tube, black polypropylene. The has smooth bore for circulating water triangular ribs. latter support sheath form between themselves cavities prevent any loss absorbed heat. This simple inexpensive can easily installed extended suit various conditions.