Solar energy can be used in continuous rainy weather. However, it is best not to use it during thunderstorms. It can be used on other rainy days, but the water temperature should not be too high.
Reasons to use solar energy on continuous rainy days:
1 First of all, from the above working principles of solar water heaters, we know that sunlight is the main source of energy for solar water heaters. solar water heaters. Solar Energy Water heaters rely heavily on sunlight.
2. Therefore, in rainy weather, many people think that the normal use of solar water heaters will be affected. In fact, this concern is unnecessary. Weather factors were taken into account from the beginning of the development of a reliable solar water heater. The solar water heater has an anti-freeze function when the temperature dIf the vacuum tube is below a certain safe temperature, the heating tape will automatically turn on to ensure that the water circulation will not be blocked. ?
3. The electric auxiliary heating function of the solar water heater will automatically turn on in rainy weather or when solar energy is not enough to guarantee the water temperature to ensure normal hot water supply.
Detailed information:
Disadvantages of solar energy:
1. Dispersion: reaching the surface of. the earth Although the total amount of solar radiation is large, the energy flux density is very low. On average, near the Tropic of Cancer, when the weather is relatively clear in summer, solar radiation irradiance is greatest at noon, and the average solar energy received over un area of 1 square meter perpendicular to the direction of sunlight is approximately 1,000 W;
Based on the average day and night throughout the year, this represents only about 2 million W. In winter it is only about half, and on cloudy days it is usually only about 1/5. This energy flow density is very low. Therefore, when using solar energy, if we want to obtain a certain conversion power, we often need a set of collection and conversion equipment with a considerable area, which is expensive.
2. Instability: Due to the limitations of natural conditions such as day and night, season, geographical latitude and altitude, as well as the influence of random factors such as clear, cloudy, cloudy, rain, etc. ., the time required to reach a certain ground Solar irradiation is both intermittent and extremelyent unstable, which makes the large-scale application of solar energy more difficult.
In order to make solar energy a continuous and stable energy source, and ultimately an alternative energy source capable of competing with conventional energy sources, the problem of solar energy storage energy must be well resolved, that is to say the energy of solar radiation. in clear weather it should be stored as much as possible. It can be used at night or on rainy days, but energy storage is also one of the weakest links in solar energy use.
3. Low efficiency and high cost: The level of development of solar energy use is theoretically feasible in some respects and technically mature. However, due to the low efficiency and high cost of some devices using solar energy, the current laboratory useThe efficiency does not exceed 30%. In a way gIn general, the economy cannot compete with conventional energy.
4. Solar Panel Pollution: At this point, solar panels have a certain lifespan. Typically, they need to be replaced every 3-5 years at most, and replaced solar panels are very difficult to break down. by nature, thus causing considerable pollution.
Baidu Encyclopedia - Solar Energy
Can solar water heaters be used in rainy or cloudy days?
On rainy days, there is no direct sunlight and there is scattered radiation. It will be warm, but the heat will not be as high as the water temperature on sunny days.
It is difficult for ordinary water heaters to meet the bathing conditions on cloudy and rainy days. There is therefore a combination of solar energy and other energy sources, such as electric heating, hotgas and oil engines, etc. The problem of not being hot on cloudy and rainy days has also promoted technical research on heat collection, heat pipes and sonic heat exchange whether it is cloudy or not, haha, for me. notice, please refer to it.
Solar water heaters can be used on cloudy and rainy days.
The vacuum tube of the solar water heater is installed on the roof. The vacuum tube can also produce heat on cloudy and rainy days, but compared to sunny days, the water temperature will not heat up as quickly. . It may not give the effect of a sunny day.
There are many brands of solar water heaters, and their water replenishment can be automatic or semi-automatic. At night we use the hot water which has been isolated in the water storage tank. Generally, the heat collection area and storage capacity of eHot water from solar water heaters are configured according to the needs, so there is no need to worry about the situation where there will be no hot water.
Detailed information:
Daily maintenance
1. When using a solar water heater, there may be a smell of dust or oil in the water pipe. When using for the first time, you can open the faucet first to remove debris.
2. The water stored in the solar water heater should be discharged regularly depending on local water quality conditions. Drain time can be selected in the morning when the sensor temperature is lower.
3. The surface of the solar water heater should be wiped regularly depending on the amount of dust in the area. It can be cleaned when it rains. Keeping the water heater surface clean can get higher heat. collection efficiencyyou.
4. When hot water is not used for several consecutive sunny days, the hot water temperature will be very high. When using the solar water heater, please turn on the cold water first, then turn on the cold water. hot water to avoid burns.
5. There is usually a filter device at the outlet end of the faucet. Scale and debris in the water line accumulate on this screen. It should be removed and cleaned regularly to increase water flow. smooth exit.
6. In winter, it is very common for pipes to freeze. If it turns out that the pipe has frozen but is not yet cracked, it can usually be cleaned automatically after the temperature rises. You can also use a hair dryer to dry it, or wrap a towel around the water pipe, then slowly pour it with warm water. Do not use fire. Cook, strike or blanch pipes in boiled waterhot, which could cause them to burst. Multiple freeze blockages can easily cause pipes to freeze and crack. Pipe insulation measures must therefore be reinforced.
7. Solar water heaters should be cleaned, inspected and disinfected on average every two to three years. Users can also do some disinfection work themselves, such as purchasing chlorine-containing disinfectants and adding them. At the water. Pour it into your mouth, soak it for a while, and then release it, which can achieve a certain disinfectant effect.
Reference link: Baidu Encyclopedia - Solar Water Heater