A solar water heater uses solar energy to heat water and consists of solar collector panels and an insulated storage tank. The panels heat water that circulates between the storage tank and collectors. Heated water is then available for use. There are two main types: flat plate collectors and evacuated tube collectors. Evacuated tube collectors are more efficient, working even in cloudy or rainy conditions using vacuum tubes and heat pipes. A solar water heater can provide over 70% of hot water needs and saves money on utility bills while reducing carbon emissions compared to electric or gas water heaters.

1. SOLAR WATER HEATER Presentation

2. WHAT IS A SOLAR WATER HEATER? A solar water heater is extremely simple. On a typical single-family residence, there will typically be one or two solar collector panels on the roof. The panels resemble skylights, and will be about 4 feet wide and 8 to 10 feet long. The cold water supply is connected to the solar storage tank. Water to be heated circulates between the storage tank and the solar collectors. The output from the solar storage tank becomes the cold water connection to the conventional gas, electric or oil water heater. When a hot tap is opened, pre-heated water is drawn from storage into the conventional ("auxiliary") water heater. The burner or electric element turns on only if the temperature cannot be maintained by the solar heater. Most properly-designed solar water heaters will supply 70 per cent or more of all the energy needed for water heating. Solar water heater produces hot water using energy from sunlight. Hot water is used for different applications, domestic as well as industrial. By using solar water heaters, we can save the electricity and in turn save a lot of money.

3. How It Works Solar Water heater consists of mainly 2 parts. One is the collector and other is Insulated tank. The cold water in the collector get heated up and collected in the tank by thermo siphon principle. This circulation continue till the water in the tank heated up to 60-80° centigrade. The hot water in the tank remains hot for more than 48 hours

6. Comparison of Flat Plate/Evacuated Tube Collector

7. Vacuum tube solar water heater working principle Solar water heater is all glass vacuum tube, heat preservation water tank, bracket three parts. The core component is the all-glass vacuum collector tube, which consists of two concentric circle of the special hard glass tube borosilicate composition, and the inner wall of glass vacuum coating process by magnetron sputtering coating, the coating on the sun Selective absorption of light, its absorption ratio ≥ 0.92, emission ratio ≤ 0.09 (80 ℃), with a high absorption rate and low emissivity. Vacuum tube to absorb solar radiation into heat energy, the use of water density than cold water, cold water sink, hot water up the characteristics of the formation of cold water in the vacuum tube from top to bottom, bottom of the natural water cycle The temperature of the entire water tank to gradually increase, reach ascertain temperature.

12. Thank You Prepaid By : Karthik Madhavan B.E Design Engineer ( solar )