Solar water heater is a popular household water heater that uses solar energy as energy. It is loved by people and has become a representative product for energy saving, environmental protection and carbon emission reduction. The heating method of solar water heaters refers to the process of converting solar energy into thermal energy and transferring it to water to heat water. This article briefly explains this.
The heating methods of solar water heaters are mainly divided into two methods: direct heating and indirect heating.
Direct heating involves directly converting solar energy into thermal energy via solar collectors to heat water. The internal structure of the solar collector mainly includes heat-absorbing plates, heat-absorbing tubes and insulating layers. Once the solar collector has received theIn sunlight, it absorbs solar energy through heat-absorbing plates. heated and transferred to the water tank, heating the water. The direct heating method is simple, very efficient and reduces thermal energy transmission losses. This is a heating method commonly used in solar water heaters.
Indirect heating method means that the solar collector absorbs sunlight and converts it into thermal energy, then transfers the thermal energy to the heat exchanger. The heat exchanger is used to transfer thermal energy to the water tank. , and the water in the water tank is heated. This method requires an external heat exchanger for heating. The indirect heating method has more connections than the direct heating method. Solar energy cannot be directly converted into thermal energy during the heating process. However, due to the yieldHigh t of heat exchanger, solar energy can be fully utilized to achieve better heating effects. .
In short, solar water heaters have the characteristics of simple heating method, energy saving, environmental protection and pollution-free, etc., making it an economical and practical water heater for families.
It is a form of solar energy conversion
In simple terms, solar water heaters are the process of absorbing the radiant heat from the sun and then transferring it to the water, which is:
Sunlight passes through the first glass layer of the heat-absorbing tube and shines on the black heat-absorbing layer of the second layer of glass, absorbing the heat of solar energy from both. the glass layers are vacuum insulated, the external heat transfer will be greatly reduced (heat transfer radiatestif still exists, but there is no external heat conduction or heat convection), most of the heat can only be transferred to the water inside the glass tube, heating the water into the glass tube and the heated water will move slightly along the glass. The heating surface of the tube moves upward into the insulated water storage bucket, and the relatively low temperature water in the bucket enters the glass tube along the backlight surface. glass tube for refilling. In this continuous cycle, the water in the insulated water storage bucket is continuously heated, thereby achieving the hot water target.
The forms of conversion of solar energy are electrical energy and thermal energy.
1. Conversion of solar energy into electrical energy
Conversion of solar energy into electrical energy is currently the method of energy utilizationmost widely used solar power. The solar panel (SolarPanel) is the main device that converts solar energy into electrical energy. A solar panel is made up of a large number of solar cells connected in series. When sunlight hits the solar panel, the solar cells convert the light energy into electrical energy and transmit it to the panel.
2. Converting solar energy to thermal energy
SunConverting energy to heat is another common way to use solar energy. Solar water heaters, solar heat pumps, solar dryers, solar thermal power generation, etc. are all typical representatives of the use of solar thermal energy. Solar water heater is a device that converts solar energy into thermal energy that people can use. Solar water heaters are mainly composed of two parts: a solar collectorre and a water storage tank.
Analysis of solar thermal energy production technology
The solar dryer is a device that converts solar energy into thermal energy to dry the items. Solar dryers are mainly composed of solar collectors, drying boxes, fans and other components. The solar collector converts solar energy into thermal energy and sends hot air into the drying box through fans and other components, so that items can be dried in the drying box.
Solar thermal power generation is a technology that converts solar energy into thermal energy and uses it to produce electricity. Solar thermal power generation mainly consists of solar collectors, boilers, turbogenerators and other components. The solar collector converts solar energy into thermal energyat high temperature, which is converted into steam via boilers and other components, and then the steam is converted into electrical energy via turbogenerators.