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Solar Thermal Water Heating

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  • Solar Thermal Water Heating

    Solar thermal (ST) is one of the most cost-effective renewable environmentally friendly heat / energy systems. Solar thermal water heating systems collect the sun's energy in the form of thermal or heat energy. The system can save a major portion of your utility bill. Solar thermal systems do not have the same limitations from shading that PV systems do since the panels gather the radiant heat rather than the direct sunlight necessary for photovoltaics.

    It will save you plenty, as you won't need as much gas or electricity to heat water for your home: the sun will do most of the work. Sunlight (always free) heats your water from a regular temperature to a temperature somewhere between 90 and 100 degrees Fahrenheit. This drastically reduces your water heating costs.

    The collectors use the energy from the sun to heat water for domestic, space and pool heating applications and are combined with a storage tank and auxiliary back-up to provide comfort and reliability. The collectors are available in portrait (vertical) and landscape (horizontal) formats.

    How They Work

    Solar water heating systems include storage tanks and solar collectors. There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don't.

    Most solar water heaters require a well-insulated storage tank. Solar storage tanks have an additional outlet and inlet connected to and from the collector. In two-tank systems, the solar water heater preheats water before it enters the conventional water heater. In one-tank systems, the back-up heater is combined with the solar storage in one tank.

    Three main types of solar collectors are used for residential applications:

    Flat-plate collector
    Glazed flat-plate collectors are insulated, weatherproofed boxes that contain a dark absorber plate under one or more glass or plastic (polymer) covers. Unglazed flat-plate collectors—typically used for solar pool heating—have a dark absorber plate, made of metal or polymer, without a cover or enclosure.

    Integral collector-storage systems
    Also known as ICS or batch systems, they feature one or more black tanks or tubes in an insulated, glazed box. Cold water first passes through the solar collector, which preheats the water. The water then continues on to the conventional backup water heater, providing a reliable source of hot water. They should be installed only in mild-freeze climates because the outdoor pipes could freeze in severe, cold weather.

    Evacuated-tube solar collectors
    They feature parallel rows of transparent glass tubes. Each tube contains a glass outer tube and metal absorber tube attached to a fin. The fin's coating absorbs solar energy but inhibits radiative heat loss. These collectors are used more frequently for U.S. commercial applications.

    There are two types of active solar water heating systems:

    Direct circulation systems

    Pumps circulate household water through the collectors and into the home. They work well in climates where it rarely freezes.

    Indirect circulation systems
    Pumps circulate a non-freezing, heat-transfer fluid through the collectors and a heat exchanger. This heats the water that then flows into the home. They are popular in climates prone to freezing temperatures.


    Sadoun Solar Sales

  • #2
    Re: Solar Thermal Water Heating

    Here is a picture of Solar Thermal Hot Water Green Energy Heating System:

    Click image for larger version

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