Solar water heaters use solar energy (sun light) to generate heat which used to heat water for home uses, industrial uses hotel or many places where hot water necessary. Solar water system is safe, efficient and eco- friendly system

1. Owais Ahmad
Roll No # 05
Renewable energy
USPCASe Uet-P

2. Solar Water Heater System

3. Solar Water Heater
Solar water heaters use solar energy (sun
light) to generate heat which used to
heat water for home uses, industrial
uses hotel or many places where hot
water necessary. Solar water system is
safe, efficient and eco- friendly system.

5. HISTORY
• There are records of solar collectors in the United States dating
back to before 1900, comprising a black-painted tank mounted on
a roof.
• SWHS has been widely used in
Greece, Turkey, Israel, Australia, Japan, Austria and China. Flat-
plate collectors for solar water heating were used in Florida
and Southern California in the 1920s. Interest grew in North
America after 1960, but especially after the 1973 oil crisis.
• Israel is a country, where solar water heaters are being used
since 1950s.
• There was a fuel crisis and restrictions were imposed on heating
water using fossil fuel.
• Since then the Israelis are accustomed with heating water
using SWHS. In 1980, the Parliament of Israel introduced a law
on mandatory solar heating for new residential buildings

6. An advertisement for a Solar Water Heater dating to 1902

8. • Israel became the world leader in the use of solar energy per capita with 85% of
households using solar thermal systems (3% of the primary national energy
consumption),[8] estimated to save the country 2 million barrels (320,000 m3) of oil
a year.[9]
• In 2005, Spain became the world's first country to require the installation
of photovoltaic electricity generation in new buildings, and the second (after
Israel) to require the installation of solar water heating systems, in 2006
ASIA
• After 1960, systems were marketed in Japan
• Australia has a variety of national and state and regulations for solar thermal
starting with MRET in 1997
• Solar water heating systems are popular in China, where basic models start at
around 1,500 yuan (US$235), around 80% less than in Western countries for a
given collector size. At least 30 million Chinese households have one. The
popularity is due to efficient evacuated tubes that allow the heaters to function
even under gray skies and at temperatures well below freezing

9. Why SWH?

10. Scope of SWHS in Pakistan
• Pakistan has a varying climate extending from extreme
to moderate due to its unique geographical features.
• Normally in the countryside, wood or biomass is used
for heating and in urban areas electricity or fossil fuels
are used for this purpose. This practice is either
expensive or degrades the environment.
• Therefore, solar water heating system can be a suitable
alternative to meet the growing demand of hot water
in the country without exerting further pressure on
electricity or cutting of forest trees from the forest
areas. The SWHS has the potential to save millions in
energy costs in our country.

11. Solar Water Heater Working
As the rays of
converted into
the sun strike the collectors, they are
heat waves. That heat energy is then
transferred to the water storage tanks ,where it heats the water
until is it called upon for use. In simply words you can say that
Rays from the sun shine on the panel collectors that subsequently
transfer that heat to the water storage tank.

12. Solar Water Heater Working

15. Basic Components of SWHS
• Flat plate collector Insulated water
storage tank
• Well insulated pipes connecting flat plate
collector and to the storage tank
• Auxiliary heater ( for cloudy days)
Control of the system

16. Flat Plate collector
It is a device which is used to convert solar
energy into thermal energy & consists of the
following components:
Absorber
Transparent cover
Insulation
Tubes, Fins
Frame
Tilting angle: 0.9×latitude of the place

17. Price in Pakistan
• Olx price