solar water heater
We will introduce some gadgets and equipemtns in green energy, such as solar water heater, solar cell phone, gadgets using wind power. Today, I want to say something about solar water heater.
Solar water heaters, also called solar domestic hot water systems, is a cost-effective way to generate hot water for your home. Solar water heaters (solar domestic hot water systems) can be used in any climate, but different types of solar water heaters work best in different areas, and they use free sunshine. This will cut your bill for electricity.
Solar water heater includes two main parts: storage tanks and solar collectors. There are active solar water heating systems and passive solar water heating systems. The active ones have circulating pumps and controls, but the passive solar water heating systems don't. In fact there are many suppliers of solar water heaters in China. They perform differently mainly because of this.
The world saw a rapid growth of the use of solar water heater after 1960. And in China in some rural areas, so many solar water heaters are applied.
Most of solar water heaters require a well-insulated storage tank. And solar storage tanks have an additional outlet and inlet connected to and from the solar collector. In two-tank systems, solar water heaters preheat water before it enters the conventional water heater. But in one-tank systems, the back-up heater is combined with the solar storage in just one tank.
The water from the solar collector can reach very high temperatures in good sunshine, or if the pump fails. So there's overheat protection system for solar water heaters.
