Solar Hot Water Heater
A solar water heater uses the sun ’ s energy to pre-heat household water before it enters the conventional gas ( or electric ) water heater . Because of the tremendous amount of sun that Africa receives , a solar water heater could generate up to 90 % of your annual water heating needs .
How it works
The design of this type uses the all-glass evacuated solar collector tubes as a heat absorbing element . The high vacuum degree of the clearance between the outer and inner tube reduces the heat emission which is caused by convection and conduction to a very low level . All-glass evacuated tubes , transfer solar energy into heat energy by high absorption rate and low emittance rate of layer films . Due to the different densities between the hot water and the cold water , a cycle is created in the tube in which hot water ascends and cold water descends . As the natural circulation is maintained , the water in the tank is heated
Why buy a Solar Water heater ? With savings in electricity or natural gas , solar water heaters pay for themselves within four to eight years . And solar water heaters last between 15 and 40 years--the same as conventional systems--so after that initial payback period is up , zero energy cost essentially means having free hot water for years to come .
Will solar heating affect how much water I will have ? Will I have to change my bathing and cleaning routine ? Yes and No . You will actually have much more hot water than ever before . If the system is sized well for your family , you will no longer need to wait for the water heater to ‘ recharge ’ between showers . Solar water heaters are always installed in addition to your regular water heater . That means that even during bad weather you will still have hot water . To maximize your savings , you should attempt to use the most hot water in the late morning and early afternoon when the solar system is operating at its peak . Also , it helps to spread your cleaning load over the week . For example , instead of washing seven laundry loads all at once it would pay to do one a day . This will reduce the amount your regular water heater must operate .
Materials
1 . Inner tank : SUS304-2B stainless steel 2 . Outer tank : Color steel / Stainless steel 3 . Insulation : Polyurethane 4 . Frame : 1.5 mm Galvanized steel
pg . 2