Take a wooden box similar to a drawer, lay a 4-5 cm thick foam board (or an old quilt) on the bottom and around it, and cover the wooden box with a piece of glass ( or a plastic sheet). Place 1-2 water tanks inside, with a diameter of 15-20cm and a height of 60-100cm. They are made of galvanized sheets and filled with water. The exterior of the melter is painted black, with a water inlet inside. at the bottom and an exit at the top. The water inlet is connected to the house's hot water tap. There is an overflow opening on the top. When the water is full and overflowing, close the water inlet valve. Such a simple solar water heater is made. Water temperatures can reach 60 degrees in summer and 45 degrees in winter.
Solar water heater materials: box (preferably iron box), small tin can (must be metal), foam, reflector (aluminum sheetsm from cigarette boxes, mirrors, CD scraps can be used), adhesive tape, black paint, cellophane.
Stainless steel is not rust-free. Water used for a long time in stainless steel clad solar water heaters contains a large amount of rust-soluble heavy metal salts. In addition, it contains a large quantity. of rust-soluble heavy metal salts, it is easy to form knots on the inner tank. White deposits should be replaced or cleaned regularly with acetic acid.
The two most common types of water heater linings on the market are ordinary stainless steel and food grade stainless steel, and imported food grade stainless steel using of the latter can meet consumption needs, but it is ordinary. stainless steel cannot.
Informationdetailed:
Working principle: the first stage of passing sunlight through the heat-absorbing tube The first layer of glass shines on the black heat-absorbing layer of the second layer of glass, absorbing heat from solar energy. Since both layers of glass are vacuum insulated, heat transfer will be significantly reduced (radiant heat). transfer still exists, but there is none (in addition to heat conduction and heat convection), most of the heat can only be transferred to the water in the glass tube, heating water in the glass tube.
The heated water will flow upward along the heating surface of the glass tube and enter the insulated water storage bucket. The relatively low temperature water in the bucket will enter the glass tube along the backlit surface of the glass. tube for replenishment. Inthis continuous cycle, the conservation of heat. The water in the water storage barrel is continuously heated to achieve the hot water target.