China's first solar water heater was born in 1978, when there was a lack of energy. The original intention of solar water heater was to use the inexhaustible environmental energy in nature for people's lives. After decades of development, nearly every family has a solar water heater. The other is a photovoltaic solar water heater, both of which harness the sun's energy.
solar cable supplier say the difference between them lies in the way they use solar energy. Collector solar water heaters use the collector tube to absorb the heat from the sun and heat the water in the tank by convection through water or heat conduction medium, while photovoltaic solar water heaters use the photogenic volt effect. Using solar panels to convert light into electricity, the electricity is then used to directly heat the water in the tank.
In addition, their installation is also different, collector solar water heater is mostly integrated, use to rely on the water gravity natural outflow, installation position is higher than the use of the position, typically can only be installed on the roof, the alternative is split, the water tank must be higher than the heat collection plate, can not be too far apart, more installed in the balcony, the position requirements are strict; the Photovoltaic solar water heater photovoltaic panel and water tank are two parts. There is no distance limit and different problems can be installed on the outside of the balcony, the roof or the ground, the water tank installed in the bathroom, kitchen, etc., the installation is more flexible, so the photovoltaic solar water heater is more convenient than the installation of the collector water heater.
In general, the collection of solar water heater by the restrictions are additional, such as the need for a lot of water, the collection of solar water heater tank can only use how much water, and for example in the night when there is no sunlight, photovoltaic solar water heater can be unused in the rest of the day electricity storage with the use of open, and the solar energy inexhaustible, both save electricity and money. In my opinion, the collector solar water heater has too numerous restrictive factors and will gradually exit the stage of history. However, with the continuous and rapid development of science and technology, the photovoltaic solar water heater will be full of infinite possibilities.