Solar Water Heater

WORKING PRINCIPLE


Solar water heating system works on the principle of black body absorption. The selective Coatings used in solar

Collector Collector absorbs Solar Radiations  and Convert it heat to Energy. The heat Collected by Collector is than

Exchanged through heat Exchanger to water in storage tank. The beauty of the system is that it works on partially

Cloudy days . It Can reduce your heating costs by up to 90%

Types of Solar Heater:-

1. EVACUATED TUBE COLLECTOR TECHNOLOGY

2. FLAT PLATE COLLECTOR TECHNOLOGY

Proven Technology used world wide for more than 50 years

Types of systems available :- 

• Direct Heating:-   Water gets heated inside the collector tubes and stored in the Hot water storage tank, after some time scaling gets started inside the collectors tubes and it needs periodical cleaning resulting heavy maintenance charges
• Indirect Heating:- water gets heated inside the hot water tank itself. Coolant is used as heating media between collectors and hot water storage tank. Coolant is anti scaling and anti freezing also.  So no maintenance required at all.
• Non-Pressurized :- In case water supply is by gravity then normal tanks are proposed. A tank of pvc required on height at least 9 feet from roof level.
• Pressurized :-   If cold water supply is pressurized then hot water supply should be pressurized, for this application pressurized solar systems are proposed.
• Thermosyphon:-  Heating of water starts and stops automatically when sun shine come and goes off , no need of pump for circulation of heating from Solar collectors to hot water tank.  (when space is not a problem)
• Forced Flow:-  Pumps with D.T.C. (Differential Temperature Controllers) are used for circulation of heating from Solar collectors to hot water tank. This type of system is proposed where space is less or system is designed according to site requirements.

 Benefits

• instant hot water
• high water pressure lasts longer (depending on tank capacity)
• life expectancy of 15 to 20 years
• run multiple appliances concurrently: shower, do laundry and run the dishwasher all at the same time

Sesource:- https://completesolars.wordpress.com/2014/10/09/solar-water-heater/