Solar Water Heating

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Solar thermal energy is a technology for harnessing solar energy for thermal energy. Solar thermal collectors are classified by the United States Energy Information Administration as low-, medium-, or high-temperature collectors. Low-temperature collectors are flat plates generally used to heat swimming pools.

>> Solar Swimming Pool Heating System

How to choose between a Flat Plate or Evacuate Tube collector? Below is a simple table to provide a general comparison. Additional factors may be present, and ultimately your local solar professional can help choose what will provide the best value for money and energy savings for your application.

How They Work

Most solar pool heating systems include the following:

  • A solar collector -- the device through which pool water is circulated to be heated by the sun
  • A filter -- removes debris before water is pumped through the collector/li>
  • A pump -- circulates water through the filter and collector and back to the pool
  • A flow control valve -- automatic or manual device that diverts pool water through the solar collector.

Pool water is pumped through the filter and then through the solar collector(s), where it is heated before it is returned to the pool. In hot climates, the collector(s) can also be used to cool the pool during peak summer months by circulating the water through the collector(s) at night.

Some systems include sensors and an automatic or manual valve to divert water through the collector(s) when the collector temperature is sufficiently greater than the pool temperature. When the collector temperature is similar to the pool temperature, filtered water simply bypasses the collector(s) and is returned to the pool.

Solar pool collectors are made out of different materials. The type you'll need depends on your climate and how you intend to use the collector. If you'll only be using your pool when temperatures are above freezing, then you'll probably only need an unglazed collector system. Unglazed collectors don't include a glass covering (glazing). They are generally made of heavy-duty rubber or plastic treated with an ultraviolet (UV) light inhibitor to extend the life of the panels. Because of their inexpensive parts and simple design, unglazed collectors are usually less expensive than glazed collectors. These unglazed systems can even work for indoor pools in cold climates if the system is designed to drain back to the pool when not in use. Even if you have to shut the system down during cold weather, unglazed collectors may be more cost effective than installing a more expensive glazed collector system.

Glazed collector systems are generally made of copper tubing on an aluminum plate with an iron-tempered glass covering, which increases their cost. In colder weather, glazed collector systems—with heat exchangers and transfer fluids—capture solar heat more efficiently than unglazed systems.

Evaluating Your Site's Solar Resource

Before you buy and install a solar pool heating system, you first need to consider your site's solar resource. The efficiency and design of a solar pool heater depends on how much of the sun's energy reaches your building site.

Solar pool heating systems use both direct and diffuse solar radiation. Therefore, even if you don't live in a climate that's warm and sunny most of the time -- like the southwestern United States -- your site still might have an adequate solar resource. Basically, if your building site has unshaded areas and generally faces south, it's a good candidate for a solar pool heating system.

Your local solar system supplier or installer can perform a solar site analysis.

>> Solar water heater

What is a Solar Water Heater?

Solar water heaters use the solar energy from the sun to generate heat (not electricity) which can then be used to heat water for showering, space heating, industrial processes or even solar cooling. Solar energy is the primary energy source for our planet as it is responsible for providing energy for plant growth (photosythesis) and providing the warmth that makes our planet habitable. While solar water heater devices have been around for over 100 years, the last 20 years have seen significant advances in absorber coating technologies, resulting in solar collectors that can reliably convert >50% of available sunlight for domestic hot water supply. A solar water heater is one of the most effective ways of cutting a household's carbon footprint by reducing reliance on dirty fossil fuel usage. By offsetting the use of electricity, gas or heating oil, using solar water heaters can also provide financial savings by reducing energy costs.

Solar Water Heater Features:

  • High thermal output with extra heat retention
  • Eco Friendly
  • Hot water even in winter and partially cloudy days
  • Electrical backup heater for additional capacity
  • Low maintenance & easy to clean

Two modes of solar water heater:

  • Thermosyphon type SWHS
  • Forced flow type SWHS

Thermosyphon type SWHS :

This heater works on the Thermosyphon Principle, where hot water being lighter rises up and gets collected in the insulating storage tank. An equal quantity of cold water replaces the hot water and process goes on as long as the Sun is shining. Under this process no water pumps are required as the cold water automatically replaces hot water. These heater are available in direct and indirect type.

Forced flow type SWHS:

In these heaters, the cold water is transferred to the collector with the help of a pump from the cold water tank. The insulated storage tank is used for the storage of water from the solar panels and is transferred with the use of hot water outlet.

Solar Experts offers two types of solar collectors for use in a solar water heater system

Evacuated Tube Collectors:

Evacuated Tube Collectors combine the high efficiency performance of evacuated tubes with rapid heat transfer capacity of heat pipes to provide a collector that can operate efficiently in almost any climate providing hot water for residential or commercial solar water heating projects.

Flat Plate Collectors:

Flat Plate Collectors offer a reliable supply of solar hot water for residential and commercial applications where evacuated tubes may not be suitable.

Flat Plate vs Evacuated Tubes

How to choose between a Flat Plate or Evacuate Tube collector? Below is a simple table to provide a general comparison. Additional factors may be present, and ultimately your local solar professional can help choose what will provide the best value for money and energy savings for your application.

Technical Details

    Inner Tank

  • SS 304 anti corrosion material
  • Automatically welded for quality and reliability
  • Outer Tank

  • Pre coated steel/Aluminium
  • Automatically seamed joints
  • Insulation

  • 50 mm pressure injected high density PUF
  • Overnight temperature drop 4-5 °C