SOLAR WATER HEATER
Solar water heating (SWH) is the conversion of sunlight into renewable energy for water heating using a solar thermal collector. Solar water heating systems comprise various technologies that are used worldwide increasingly.
In a "close-coupled" SWH system the storage tank is horizontally mounted immediately above the solar collectors on the roof. No pumping is required as the hot water naturally rises into the tank through thermosiphon flow. In a "pump-circulated" system the storage tank is ground- or floor-mounted and is below the level of the collectors; a circulating pump moves water or heat transfer fluid between the tank and the collectors.
SWH systems are designed to deliver hot water for most of the year. However, in winter there sometimes may not be sufficient solar heat gain to deliver sufficient hot water. In this case a gas or electric booster is used to heat the water.
Water heated by the sun is used in various ways. While perhaps best known in a residential setting to provide domestic hot water, solar hot water also has industrial applications, e.g. to generate electricity.[1] Designs suitable for hot climates can be much simpler and cheaper, and can be considered an appropriate technology for these places. The global solar thermal market is dominated by China, Europe, Japan and India.
In order to heat water using solar energy, a collector, often fastened to a roof or a wall facing the sun, heats a working fluid that is either pumped (active system) or driven by natural convection (passive system) through it.[2] The collector could be made of a simple glass-topped insulated box with a flat solar absorber made of sheet metal, attached to copper heat exchanger pipes and dark-colored, or a set of metal tubes surrounded by an evacuated (near vacuum) glass cylinder. In industrial cases a parabolic mirror can concentrate sunlight on the tube. Heat is stored in a hot water storage tank. The volume of this tank needs to be larger with solar heating systems in order to allow for bad weather[clarification needed], and because the optimum final temperature for the solar collector[clarification needed] is lower than a typical immersion or combustion heater. The heat transfer fluid (HTF) for the absorber may be the hot water from the tank, but more commonly (at least in active systems) is a separate loop of fluid containing anti-freeze and a corrosion inhibitor which delivers heat to the tank through a heat exchanger (commonly a coil of copper heat exchanger tubing within the tank). Copper is an important component in solar thermal heating and cooling systems because of its high heat conductivity, resistance to atmospheric and water corrosion, sealing and joining by soldering, and mechanical strength. Copper is used both in receivers and primary circuits (pipes and heat exchangers for water tanks).[3]
WITH THE HELP OF GAS SOLDERING WE JOIN COPPER TUBES IN A FRAME IN THESE TUBES THE WATER FLOWES
THUS IT LOOKS LIKE THIS AFTER SOLDERING NO WE CALL IT A COPPER PANEL
NOW WE PAINT ONE OF THE SIDES WITH BLACK COLOR SO THAT IT ABSORBS MORE HEAT
WE INSULATE THESE COPPER TUBES INSIDE A PVC BASED GLASS BOX AND PROVIDE THERMAL INSULATION BY ROCK WOOL
it is then covered with TIN sheet
then we place the copper tubes inside this box
now we cover this arrangement with toughened glass sheets
ISI CERTIFICATION TAG
THUS FROM THE TUBES TO BOX IT LOOKS LIKE THIS
THUS THE WHOLE SETUP IS INSTALLED ON THE ROOFTOP OF BUILDINGS WHO NEED FREE HOT WATER
go through the video for a better idea
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