Glass lined solar water heater
Glass-lined solar water heater
Glass-lined water heaters are a type of solar water heater in which a glass tube is located within a water tank, and in which the outside of the glass tube is thermally insulated from the water contained within the tank.
The benefits of glass-lined water heaters are:
They are cheaper to produce
They are more resistant to damage and Corrosion Protection Technology
They are more reliable
Their insulating properties are good
They have a longer life
They are easier to repair
They require fewer components to be used
Glass-lined solar water heater manufacturers in India
Glass-lined water heaters became popular during the 1940s when they were promoted as an alternative to solar water heaters that were typically constructed of asbestos-cemented cast iron.
glass lined solar water heater
Operation
In glass lined solar water heaters, a glass tube is located in the bottom of a water tank, and a solar-collecting collector is placed in the upper end of the glass tube. The lower end of the glass tube is fitted with a small tube or pipe which connects the tube to a solar water heating system. Solar heat is conducted through the glass tube and is transferred to the water in the tank. The water is heated and circulated through the tank, where it is used for space heating. The water which is not used is returned to the tank via a drain.
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Materials The glass lining can be constructed of a variety of types of glass. The most commonly used type is tempered glass, although un-tempered or colored glass is also used. The glass lining must be insulated from the water tank, which can be done by installing a thermal barrier between the water tank and the glass lining, or by simply leaving a space between the glass lining and the water. When a space is left between the glass lining and the tank, the space can be filled with a thermal insulator, and/or the thermal insulator can be installed inside the glass tube. The inside surface of the glass tube should be insulated by installing a layer of glass wool, fiberglass, or other insulating material between the glass tube and the metal of the collector tube. The collector tube is typically constructed of steel. Copper collectors were commonly used in the early 1970s. Today, copper is rarely used due to increased costs, environmental concerns, and high rates of corrosion. While glass collectors can be used, most glass collectors used today have a silver or silver alloy coating on their inside surface, to make them compatible with the silver-alloy coated collector tube. Copper collector tubes with silver-alloy coated inner surfaces are also available. Construction A glass lined solar water heater can be constructed in a variety of different ways. One type of design has the collector located inside the tank, the water is added into the collector, the collector is sealed, and then the collector tube is installed inside the glass lining. Another type of design has the collector located outside the tank, the water is added to the collector, and then the collector tube is installed inside the glass lining. The most commonly used type of glass lined solar water heater is the type where the collector tube is located inside the tank. There are three common ways to construct a glass-lined solar water heater: A tube type A sheet type A tube-sheet type The tube-type construction consists of a collector tube that is installed inside the glass lining. The collector tube is installed inside the glass lining after the glass lining has been installed in the tank. The sheet-type construction consists of a sheet that has been cut to the desired size. The sheet is installed on the bottom of the tank. A piece of a thin, flat metal sheet (commonly copper, but other metals can be used) is used to form the base of the water tank. The collector tube is installed inside the glass lining, and the collector tube is attached to the sheet with one or more copper straps. The straps are placed on the sheet and they are soldered or welded to the sheet, and to the collector tube, to form the collector and collector tube. The tube-sheet type construction consists of a collector tube that is installed inside the glass lining after the glass lining has been installed in the tank. The collector tube is attached to the bottom of the tank with one or more copper straps. A flat, thin metal sheet is placed on the collector tube and is attached to the collector tube with one or more copper straps. Components The glass-lined solar water heater is made up of four main components: The collector tube The glass lining The collector tube bracket The glass tube insulator The collector tube is constructed of a type of tubing called an I-shaped collector tube. The collector tube has a round collector tube in the middle of the tube, and two legs that extend upward from the collector tube. The collector tube is normally made of a copper alloy. The collector tube is installed inside the glass lining after the glass lining has been installed in the tank. The collector tube bracket is a frame made of a type of metal that is heat-resistant and that has sufficient strength to support the collector tube and the glass lining. The collector tube bracket is installed after the collector tube has been installed inside the glass lining. The collector tube bracket can be used with a glass-lined solar water heater, in which the collector tube is installed inside the tank, and with a tubular solar water heater, in which the collector tube is installed outside the tank. The collector tube bracket is typically made of brass. The glass tube insulator is a piece of pipe or plastic that is installed inside the collector tube. The glass tube insulator should be long enough to fill the collector tube so that it does not come into contact with the collector tube. The glass tube insulator can be made of either plastic or metal. The inside surface of the glass tube insulator should be insulated from the collector tube by installing a layer of glass wool, fiberglass, or other insulating material inside the collector tube. Benefits Advantages Many people do not realize that a glass lined water heater is more resistant to damage from corrosion and from damage from impact than a conventional tubular solar water heater. The glass lining of a glass lined water heater can withstand damage. The glass lining of a glass lined solar water heater is thermally insulated, so there is less heat loss from the water heater. This results in the solar collector and the water heating system has a longer life than a comparable tubular solar water heater. A glass-lined solar water heater is less likely to develop hot spots or areas of overheating than a tubular solar water heater. Since the glass lining does not contain metallic material, there is little risk of the metal of the collector tube rusting. Therefore, there is no risk that a glass lined solar water heater will develop rust spots on the collector tube, and this means that the glass-lined solar water heater will have a longer life than a tubular solar water heater. A glass-lined solar water heater is less likely to develop leaks, and the leak will be less likely to be visible than a tubular solar water heater since the leak will not be inside the collector tube. A glass-lined solar water heater does not require the use of asbestos. Since the thermal insulating properties of the glass lining are good, a glass-lined solar water heater requires fewer components to operate, so it requires less maintenance and is easier to maintain. Since the collector tube is located inside the glass lining, a glass-lined solar water heater is simpler to repair than a tubular solar water heater. Since the collector tube is usually made of copper, copper-based alloys, or silver-alloy coated copper, which is compatible with the silver-alloy coated collector tube, there is less risk that the glass lining will be damaged during repairs. Since the collector tube is installed inside the glass lining, the collector tube will not become detached during shipping. A glass-lined solar water heater does not require a chimney. The insulating properties of the glass lining are so good that it does not require a chimney, and the chimney is not needed to reduce the chance of corrosion at the point of connection between the collector tube and the solar water heating system. A glass-lined solar water heater does not require an expansion tank. The ability of a glass-lined solar water heater to withstand corrosion and impact means that the system does not require an expansion tank.
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