Jane Shou
26th August 2010, 01:56
I had paid little attention to solar industry until I graduated and found a job in a solar water heater company whose mission is to provide simple and effective solutions for families and business concerning about the climate change and rising energy cost. I began to realize the importance of making use of free energy from sun to make our life much greener. Of course, we cannot stop the human beings' industrial development to make a more advanced world, however, everyone has the ability to reduce certain CO2 emission in their daily life. "Installing an [Admin: blatant advertising removed] solar water heater system can reduce your CO2 footprint as much as planting more than 200 trees." This is our slogan. Installing a solar water heater can also reduce your fuel cost.
Here I'd like to introduce the pressurized solar water heater system made of evacuated tubes and heat pipes, as I've saw pepople have lots of questions in the solar water heater.
Evacuated tubes are the absorber of the solar water heater. They absorb solar energy converting it into heat for use in water heating. Each evacuated tube consists of two glass tubes made from extremely strong borosilicate glass. The outer tube is transparent allowing light rays to pass through with minimal reflection. The inner tube is coated with a special selective coating (Al-N/Al) which features excellent solar radiation absorption and minimal reflection properties. The top of the two tubes are fused together and the air contained in the space between the two layers of glass is pumped out while exposing the tube to high temperatures. This "evacuation" of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes.
There's heat pipe fitted within each evacuated tubes with the heat pipe head fitted to the copper header in manifold. First step, solar radiation is absorbed by the evacuated tubes and converted into heat, then heat pipes conduct the heat from within the solar tube up to the header. Last, water is ciruclated through the header, via intermittent pump cycling. Each time the water circulates through the header the temperatures is raised by 5-10oC / 9-18oF. Throughout the day, the water in the storage tank is gradually heated. Therefore, in addition to the solar collector, you also need a storage tank to store the water and a pump to circulate the water to be gradually heated.
I don't know whether this will be clear to understand the evacuated solar water heater system, but I hope it will help in someway.:idea:
Here I'd like to introduce the pressurized solar water heater system made of evacuated tubes and heat pipes, as I've saw pepople have lots of questions in the solar water heater.
Evacuated tubes are the absorber of the solar water heater. They absorb solar energy converting it into heat for use in water heating. Each evacuated tube consists of two glass tubes made from extremely strong borosilicate glass. The outer tube is transparent allowing light rays to pass through with minimal reflection. The inner tube is coated with a special selective coating (Al-N/Al) which features excellent solar radiation absorption and minimal reflection properties. The top of the two tubes are fused together and the air contained in the space between the two layers of glass is pumped out while exposing the tube to high temperatures. This "evacuation" of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes.
There's heat pipe fitted within each evacuated tubes with the heat pipe head fitted to the copper header in manifold. First step, solar radiation is absorbed by the evacuated tubes and converted into heat, then heat pipes conduct the heat from within the solar tube up to the header. Last, water is ciruclated through the header, via intermittent pump cycling. Each time the water circulates through the header the temperatures is raised by 5-10oC / 9-18oF. Throughout the day, the water in the storage tank is gradually heated. Therefore, in addition to the solar collector, you also need a storage tank to store the water and a pump to circulate the water to be gradually heated.
I don't know whether this will be clear to understand the evacuated solar water heater system, but I hope it will help in someway.:idea: