Greentek Northern India Pvt Ltd Secunderabad, Telangana

Evacuated GlassTube 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.   The Key Component of the Evacuated Glass Tube Solar water heater is the Evacuated Glass Tube(EGT). The Evacuated Glass Tube having the best possible insulation (Vaccum Jacket), allows sunlight to pass through, but prevents thoroughly the thermal heat transfer, featuring high efficiency, low heat loss and longer life. The use of Evacuated Glass Tube Technology appears to be one of the significant progresses in the solar industry all over the world. Now Evacuated Glass Tube solar systems are popular through out the world   Advantages of EGT Solar Water Heaters Highest Efficiency - above 80% Handles hard water and no scales formation on EGT walls. Practically Nil maintenance and very long life(20 Years). Elegant appearance, light weight and can be installed easily Minimal heat loss - Thanks to EGT Technology Superior winter performance and high frost protection Available in sizes 100 / 200 / 500 liters per day or by integrating multiples of 500 LPD to suit any applications.     Evacuated Glass Tube (ET) Absorbs solar energy and converts it to usable heat. Vacuum between the two glass layers insulates against heat loss . Heat Pipe (HP) Copper vacuum pipe that transfers the heat from within the ET up to the manifold.  Manifold Insulated box containing the copper header pipe. The header is pair of contoured copper pipes with dry connects sockets that the heat pipes plug into.   Mounting Frame Strong and easy to install with various options to match different mounting methods.     Step 1:     The absorber coating on the inner glass tube absorbs sunlight and converts it into heat.   Step 2:     Steam forms inside heat pipe which transfers heat rapidly up to the manifold.  Step 3:     A pump circulates water or heat transfer fluid through the header pipe, carrying heat back to the storage tank.  Gradually throughout the day the tank is heated up. The tank can be boosted by an electric element, gas/oil boiler, or the solar tank can simply feed an existing water heater tank with solar pre-heated water.   Design Advantages Evacuated glass Tube Efficiency The vacuum space in the evacuated glass tube greatly reduces heat loss.  This greatly increases the conversion efficiency at higher water temperatures or when the outside temperature is very cold.   Passive Tracking The round absorber surface of the evacuated tubes passively track the sun throughout the day, so no mechanical tracking device is required. This allows maximum surface area exposure from 7am to 5pm which covers the majority of the solar radiation each day. The end result is on average around 60% of the total available daily light from sunrise to sunset can be converted into usage heat.   The passive tracking feature also allows the collector to be installed at directions East or West of equator pointing (North or South) without too much reduction in output.

When light energy is absorbed by a material known as a semiconductor, an electrical charge is created, this property of the material is known as the photoelectric effect. Silicon is the most common semiconductor used by PV cell manufacturers.   A grid-connected PV system is one which connects to the electricity grid. The electricity produced by the PV system is "exported" to the grid. The main advantage of using a grid-connected PV system is that the grid can be used as what is effectively an electricity storage system, where the electricity is "stored" and then "re-purchased". A grid-tied system of this type is of interest when a payment is available for the electricity being exported to the grid, to offset the cost re-purchasing of electricity exported to the grid. Grid-connected PV systems do not need physical storage systems (batteries) and so the investment cost is reduced.            In a typical grid-connected PV system, the electricity is fed from the PV modules into an inverter. The inverter converts the electricity produced by the PV system (which is DC) into AC electricity for export to the electricity grid. The inverter is usually connected to either the main circuit breaker or fuse box, or else connected directly to the incoming cables from the grid. If the PV system is not supplying sufficient electricity to power the loads in the building (e.g. at night, when there is no solar energy available), then the electricity from the grid is used. When the electricity supplied by the PV system is greater than the loads in the building, then the electricity can be exported to the electricity grid. In cases where there is a payment available for exporting electricity, this is an attractive option. Obviously it depends on the level of payment being offered.  

cells are manufactured by placing a thin film of amorphous (non crystalline) silicon onto a wide choice of surfaces. These are the least efficient and least expensive to produce of the three types. Due to the amorphous nature of the thin layer, it is flexible, and if manufactured on a flexible surface, the whole solar panel can be flexible. One characteristic of amorphous solar cells is that their power output reduces over time, particularly during the first few months, after which time they are basically stable. The quoted output of an amorphous panel should be that produced after this stabilization.

The most common hot water system involves heating and then storing hot water in a tank. When hot water is used, it is drawn from the top of the tank, where the water is the hottest, and fresh cold water is delivered into the bottom of the tank. Because hotter water is lighter and sits above colder water, it is realistic to see a tank that has bottom half cold and the top half hot... this is referred to as thermal layering, or stratification. Eventually after enough hot water usage the water suddenly turns cold, which is something everybody has probably experienced!

The most common hot water system involves heating and then storing hot water in a tank. When hot water is used, it is drawn from the top of the tank, where the water is the hottest, and fresh cold water is delivered into the bottom of the tank. Because hotter water is lighter and sits above colder water, it is realistic to see a tank that has bottom half cold and the top half hot... this is referred to as thermal layering, or stratification. Eventually after enough hot water usage the water suddenly turns cold, which is something everybody has probably experienced!

1kWh of heat energy can heat about 30 Litres 7.5 US gallons of water up from cold to showering temperature. A household of 5 people will use between 10-15kWh of energy each day to heat water (not including space heating). In the winter more energy is needed to heat water as the cold water is colder, and people often have longer and hotter showers than in the summer. Water is normally heated by electricity or gas, but solar can be used to offset between 60-80% of this energy.