There will be no damage if the high temperature hot water from the solar water heater is not discharged for a long time. However, if the solar water heater is not cleaned for a long time, there will indeed be some water pollution problems and skin damage. It is recommended to drain the water if not used for a long time.
The solar water heater itself changes the temperature of the water as it heats. Now that the temperature is high, the water in the water tank is still heated. It is natural for the temperature to be high when there is no cold water supply. Solar water heaters have an exhaust pipe that vents steam and reduces the temperature of the water tank. If the exhaust pipe is not blocked, there will usually be no problem. The best water heaters will have similar overheating protection devices to prevent overheating.has overheated. water tank from exploding.
If the solar water heater is not cleaned in time and used for a long time, it is harmful to people, because the water quality has deteriorated and bacteria has developed, which will cause some damage to the skin. Therefore, the water contained in solar energy must be used frequently. When buying you should be careful. The larger the capacity, the better. You should choose the volume of solar energy according to your own situation and the number of people. to ensure that solar water is used in one day.
Precautions for use
1. Drain the water if you do not use it for a long time. Evacuated tube solar water heaters have high heat absorption efficiency. On sunny summer days, the water temperature in the water heater can reach boiling point in less than two days. If there is nono water for a long time, the water tank will remain in a state of high temperature and pressure, which will promote the aging of the seal ring and accelerate the aging and shrinkage of the insulating material - polyurethane. Sometimes the exhaust does not flow properly. Too high pressure will cause the water tank to swell and scale, shortening its lifespan.
If the original tap water quality is poor, the water heater is stopped for a long time, and the water in the water tank is not drained, the Affected pipes connected to the water tank will rust easily. The switch may not be closed tightly and the water tank may not be closed tightly. Therefore, when a family is away from home for a long time, they need to arrange for other people to frequently drain the water heater water or drain the water heater water beforehand.t go out, or place a cover on the vacuum tube collector to block the sun then remove it after returning home.
2. Reasonably understand the timing of water supply. Although an unoccupied solar water heater will not be damaged by the sun, if water is added to a water heater exposed to the sun, the vacuum tube will still burst. Therefore, the timing of filling the solar water heater should be reasonable.
First of all, when the solar water heater is filled with water for the first time or the water tank has been empty for more than 15 minutes, be careful not to fill it with water. water during the day. The best time to get in the water is before sunrise in the morning or around 10 p.m. in the evening. Since the vacuum tube can reach 270 to 400 degrees Celsius without water, if cold water is suddenly added, the vacuum tube will burst due to the sudden drop in local temperature.
Second, do not be careless when filling the solar water heater when it is not empty. In summer, it is best not to fill the solar panel with water after 9 a.m. In winter, you should try not to replenish solar energy at night to avoid freezing and solar energy damage due to low temperatures. In addition, the amount of water should be determined according to weather conditions to ensure appropriate water temperature during bathing. If the weather is good the next day, fill it with water; if it is cloudy or cloudy, fill it with half a tank of water; if it rains all day, keep the original amount of water without adding cold water.
Method 1: The system cannot support the pressure:
Opening system, this is the structure of most of our traditional vacuum tube solar cells. There is a pipe directly connected to the. Atmosphere. When there are too manysolar energy, that is, solar energy exceeds 100°C, the water in the water tank "boils" and releases steam to dissipate heat.
Method 2: Use a T/P valve in a pressure system:
T/P valve, i.e. a temperature/pressure safety valve, the function of this valve is when the temperature exceeds or the pressure exceeds the setting. When a certain threshold value is reached, the valve opens. In a solar hot water system, the general threshold value is a temperature of 99 p>
℃ and a pressure of 0.6MPa. .
Currently, most pressurized solar water heater systems have this valve installed on the water tank as the primary means of preventing "overheating" of pressurized tube solar water heater systems. empty.
Method 3: Sun protection measures:
When the system is in danger of overheating, remove the artificial sunshade or passive automatic sunshade.Shading involves using a coating on the surface of the collector to block sunlight to prevent the vacuum tube from continuing to absorb heat and prevent the solar water heating system from "overheating" .
One of them is artificial shading. unused for a long time, artificial measures are taken to block sunlight on the solar collector, which brings insecurity and problems to consumers.
Method 4: Improve the solar vacuum glass tube so that it has effective heat absorption performance in low temperature areas and poor heat absorption performance in high temperature areas. high temperature: