A solar water heater is a device that uses sunlight to heat water. It enables substantial energy savings, as the sun shining on 1m² of roof saves approximately 2-3 units electricity a day. Generally speaking, it is possible to heat 50 to 70 % of the water used in the kitchen and the bathroom in this way. Also can be used for washing machine or dishwasher which consumes a lots hot water also cuts out the electricity used by these appliances to heat the water and shortens the washing cycles. A basic solar water heater costs on average Rs.13,500, including Tax and installation. To help you with this investment, the Government gives you Solar rebate on your electricity bills every month.
how solar water heater works
The solar water heater absorbs sun light by a solar collector passes this hot water to the solar tank. Conversely. The efficiency of the collectors is at its highest at midday, in summer, when the sky is cloudless, and facing south. However, the collectors also work well in other seasons, when the sky is cloudy, for a good part of the day, even if they face east or west. Likewise, the efficiency is best at a gradient of 35° to the horizon, but good results can be achieved with collectors fitted vertically to a façade. When there is insufficient sunlight, the water is preheated and a back-up system takes over to bring the water to the required temperature. This system can therefore be used to produce hot water at a constant temperature throughout the year without emitting any CO2.
Do solar water heaters work on cloudy days?
Since solar energy systems require sunlight, the bulk of production will take place under sunny conditions only. The output is directly proportional to the amount of infrared sunlight available at any given moment. A system can generate 50-70% of its typical output under bright overcast conditions. When rain or excessive days of cloudy conditions exist, the use of auxiliary backup where conventional energy will be needed.
what are the advantages of solar water heater.
Energy Cost it is entirely free of cost. So, while you are using a solar water heater unit, you won’t need to worry about a hundred dollars of utility bills.
The most amazing thing regarding solar water heating system is- you will be getting the energy to run your water heater as long as the sun shines. Wondering, what will happen in a sudden wet weather or rainy day? FYI, many solar units are capable of providing you energy even when the sun is not shining. So, you won’t have to worry about running short of hot water even on cloudy days.
Save Space requires less installation space compared to the conventional gas or fuel run water heaters. Still, solar water heaters are more frugal in terms of installation space. Moreover, in most of the cases, the PV or thermal panels are installed on the rooftop.
solar water heater help environment?
yes it Keeps the environment clean and pollution free, which has become the demand of recent times. A solar water heating system is environment-friendly as it doesn’t burn any fossil fuel when heating water for you. So, you have the chance to contribute to the environment and take part in the go green revolution
do solar water heater works in winter
With good insulation, sunlight will be able to heat the water quite well in a solar water heater winter. The heating is caused by the radiation energy of the sun, which can come through the glass and heat up enclosures, even if the outside temperature is well below freezing – providing good insulation can ensure very small heat loss.
The first thing to remember is that solar water heaters are not meant to completely replace your water heater. A typical solar water heater will be able to heat 60-80% of the water you use over the course of that year.
From April through September, nearly all of your hot water will be solar heated. In winter, the percentage of your hot water heated by the sun drops to as low as 10-20%—as you might expect with short days and weak sun in December. That’s why practically every solar water installed in the US will be connected to a backup conventional water heater to ensure that your hot water needs continue to be met even in January.
does solar water heater works at night
No , but hot water generated during day time gets stored in the solar tank which is insulated. A good PUFF insulated tank can keep hot water for more than 24 hours regardless of outside weather conditions.
does solar water heater save money
you might be knowing that the government has been encouraging people to go for various renewable energy options. Besides, they are also offering lots of schemes in renewable energy sectors, as well. Apart from that, investing in a solar water heating unit is- one time, and it doesn’t require many things else a few necessary fittings. Moreover, the price of solar equipment is decreasing with every living day, and many companies are offering more efficient solar equipment at less investment. So, summing up all these, you will surely save some bucks for installation cost comparing to a conventional water heater unit.
can solar water heater generate electricity2>
No. it cannot generate electricity as these are thermal collectors. only solar photo voltaic panels are used to generate electricity.
how much energy / electricity solar water heater save
A 150 litre capacity solar water heater system which is suitable for 3-4 people and can save up to 1500 units of electricity in a year, depending on hot water used. It can also save.
How long do solar hot water systems last?
approximately around 15-20 years depending upon various technology used to protect inner tank of the solar water heater system, a glass lined coated tank from supreme solar can last well over 25 years and in some part of the world its in operation for more than 20 years.
What size/Capacity solar hot water do I need?
As a rule of thumb, a relatively water efficient household is looking at a system size of 35 litres per person depending upon from which floor the solar water heater is installed, if hot water is flowing from 3 floors above the bathrooms, wastage of water will be higher. hence you may have to increase the size of tank while ordering.
How much hot water does a person use per day?
approximately around 40 to 50 litres, and if solar water is more than 3 floors from your bathroom than you need to increase capacity from 50 to 60 ltrs due to loss of hot water.
what are the types of solar water heater available
ETC evacuated tube collector type, FPC Flat panel collector are the major two types. And there are pressurized and non pressurized depending upon how much water pressure you require.
Evacuated Tube Collectors (ETC)
Evacuated Tube Collector is made of double layer borosilicate glass tubes evacuated for providing insulation. The outer wall of the inner tube is coated with the selective absorbing material. This helps absorption of solar radiation and transfers the heat to the water which flows through the inner tube.
Flat Plate Collectors (FPC)
The solar radiation is absorbed by Flat Plate Collectors which consist of an insulated outer metallic box covered on the top with glass sheet. Inside there are blackened metallic absorber (selectively coated) sheets with built-in channels or riser tubes to carry water. The absorber absorbs the solar radiation and transfers the heat to the flowing water.