Technology - Working Principle

VACUUM TUBE COLLECTOR

WORKING OF VENUS VTC SOLAR WATER HEATER

solar water heating system solar water heating system

The Venus Vacuum Tube Collector solar water heater is made up of rows of parallel, transparent glass tubes. Each tube consists of a glass outer tube and an inner tube, or absorber, covered with a selective coating that absorbs solar energy well but inhibits radioactive heat loss. The air is withdrawn ("evacuated") from the space between the tubes to form a vacuum, which eliminates conductive and convective heat loss.

The Venus Vacuum Tube Collector solar water heater is made up of rows of parallel, transparent glass tubes. Each tube consists of a glass outer tube and an inner tube, or absorber, covered with a selective coating that absorbs solar energy well but inhibits radioactive heat loss. The air is withdrawn ("evacuated") from the space between the tubes to form a vacuum, which eliminates conductive and convective heat loss.

The Vacuum tube collector absorbs the heat from the solar radiation & heats up the water stored in the system through the Thermosiphonic effect.

WHAT IS THERMOSIPHONIC EFFECT

A Thermosiphon system relies on warm water rising, a phenomenon known as natural convection, to circulate water through the collectors and to the tank. In this type of installation, the tank must be above the collector. As water in the collector heats, it becomes lighter and rises naturally into the tank above. Meanwhile, cooler water in the tank flows down pipes to the bottom of the collector, causing circulation throughout the system. This is called Thermosiphonic Effect. This process continues steadily for a number of hours till the water stored in the tank is heated up. Very high Temperatures upto 80-85 ° can be had from such a system.

FLAT PLATE

WORKING OF VENUS FLAT PLATE SOLAR WATER HEATER

solar water heating system

A solar Flat plate collector consists of a large heat absorbing plate made of a large sheet of aluminium, a good conductor of heat. This is painted in black to absorb as much solar radiation. This surface has several parallel copper pipes or tubes called risers, running length ways across the plate. These copper pipes are bonded directly to the absorber plate to allow for maximum surface contact and heat transfer. The Sun's rays heat the absorbing surface and the temperature increases. This heat is transferred to the copper pipes which contains water flowing from the overhead tank and the heat is absorbed by the water and then the hot water is used for the household.

The pipes and absorber plate are enclosed in an insulated glazed metal box. The air gap between the plate and glazing material traps the heat and transfers the heat and prevents it from escaping. To minimize heat loss, the bottom and sides are insulated.