The main reasons leading to the bursting of the solar water heater vacuum tube are:
1. There are defects in the quality of the vacuum tube itself;
2. .The water supply time of the solar water heater is incorrect. At noon and in the afternoon, water from the sun is supplied during the most toxic period;
3. The vacuum tube is struck by an external force or assembled incorrectly. leading to significant internal stress;
4. The vacuum tube itself is getting old.
What is the reason why solar water heater pipes always burst?
Analysis of why all-glass vacuum tube solar collector tubes burst:< /p>
p>1. Hot and cold shock: For example, adding cold water to a cup that has just been filled with boiling water, or adding boiling water to a cup that has just been filled with cold water, will burst the cup. The reason why a vacuum tube inglass shatters is the same as that of a cup. For example, the temperature difference between the inlet and outlet water of a forced circulation solar water heater system is too large, and the water supply is too large at noon when the sun is shining. is strong may cause the vacuum tube to burst.
2. Improper installation: If the water pump is selected incorrectly, the pressure is too high or the tap water pipe network pressure is used, causing the vacuum tube to bear excessive pressure, causing vacuum. the tube explodes; when the water tank is lower than the collector, something is wrong. This will also cause negative pressure in the system, and it is also very easy to cause pipe explosion, poor pipe insulation or insufficient vacuum in the suction pipe; insulation performance does not comply with standards. When the temperature is low thenight in winter, the water in the vacuum pipe freezes due to the temperature drop. The vacuum hose bursts and the system exhaust valve is installed incorrectly, resulting in improper installation. exhaust and air resistance. Once the system is filled with water, the maximum stress at the pipe mouth will be close to the applicable stress, which may cause the vacuum pipe to burst. The installation angle of the system is incorrect, solar. the headers are not installed on the same plane, causing stress between the vacuum tubes and the headers. When the stress limit is reached, it is easy to cause tube explosion.
3. Scale: The temperature inside the solar vacuum tube can easily reach 80 or 90 degrees, which makes scale easy to produce and adhere to the surface of the collector and vacuum tube. The thermal conductivity of scale is high. small, and thicken itement of the scale layer where it is located will be the heat exchange between the heat absorber of the vacuum tube and the heat-conducting fluid inside the tube, which forms a certain temperature difference between the interior and the 'outside of the When the solar radiation is good, the temperature of the outer part of the scale is higher and there is a greater temperature difference with the inner layer, resulting in scale cracks that allow cold liquid to penetrate in the tube in the inner wall of the tube. the vacuum tube along the cracks, which can easily cause the tube to explode.
As the most common solar energy on the market, glass evacuated tube water heaters also frequently experience tube explosions. However, black, porcelain, antique, individual and solar water heaters use ceramic manifolds to replace traditional glass vacuum tubes. collectors.The solar water heater can effectively avoid the phenomenon of tube explosion in the collector. Using ceramic plates instead of glass vacuum tubes as heat collectors has the following characteristics:
Safety
Not affected by bad weather, avoiding the risk of falling of objects at high altitude, installation and maintenance are internal demolition to maximize the safety of people and property.
Aesthetics
As building construction and windows, balcony railings, balcony railings and roofs are seamlessly integrated, truly integrating with the building.
Long lifespan
p>Revolutionary innovation in heat collection materials. Installed vertically at 90 degrees. The heat collection efficiency exceeds the national testing standard by more than 20%. The efficiency is still not high under high temperature air drying conditions at longg term.
Usage cost
As a building component to replace the original building structure, it saves construction costs; it has the same lifespan as the building, so you invest once and enjoy it for life. .
I hope this answer is useful to you, thank you.
Why do solar vacuum tubes keep exploding? There is no water supply during the day, but water supply only comes in the morning.
Causes of burst hot water pipes in solar water heaters:
1. Once the solar water tank is empty of water, the vacuum tube temperature will be higher during the day. If water is added at this time, the tube will easily burst due to the large temperature difference, sex may be the most important.
2. When there is less water in the vacuum tube, due to high temperature, the steam after the water boils rises to the mouth of the tube and condenses into water when it encounters cold air. releases a lot of heat and the vacuum tube partially overheats, expands and bursts. But it's less likely.
3. The vacuum tube cannot be insulated due to air leakage, causing the water in the tube to freeze when there is no light, causing the vacuum tube to swell and crack .
Instructions for use and precautions:
1. A full water tank is well insulated. Half a tank of water loses temperature the fastest, so the water tank should remain full. as much as possible.
2. Master the water filling time, try to fill the water in the evening or morning before the sun rises, and read the instructions carefully to master the functions of the instrument.
3. When the temperature is below 0℃, it is better to use hot waterffe-water in small quantities and several times a day, depending on the water temperature to increase the temperature of the pipe.
4. Pay attention to the weather forecast. When the temperature is very low, fill the hot water tank at night, then place a basin under the nozzle or faucet, loosen the hot water faucet a little. , and let it slow down. Run the water slowly to keep the water flowing through the pipes and avoid freezing and blocking the pipes.
Analysis of the causes of damage to solar vacuum tubes
1. Hot and cold shock: In daily life, people who used glass water cups must know it when pouring water into a cup. that has just been filled with boiling water, cold water or boiling water poured into a cup that has just been filled with cold water will cause the glass cup to shatter. The same goes for vacuum tube solar collectors. Forsome reasons, such as long-term drying in the air, water supply at noon when the sun is strong will cause the vacuum tube mouth to burst.
2. Excessive pressure: Due to improper selection of water pumps, too high lift or use of tap water pipe network pressure, the glass tube is subjected to excessive pressure, causing the pipe to explode. Additionally, the check valve of the water inlet pipe is not tightly closed, especially if the water tank is lower than the manifold, resulting in negative pressure in the system, and it is also very easy to burst the pipe.
3. Stress: The vacuum degree of the vacuum tube is not sufficient and the insulation performance is not up to standard. When the temperature is low at night in winter, the water in the vacuum tube freezes. to the drop in temperature, causing the vacuum tube to burst. Moreovers, incorrect installation position of the system exhaust valve results in poor exhaust and air resistance. After the system is filled with water, the maximum stress of the pipe mouth will be close to the applicable stress, which may cause the pipe. explode; the installation angle of the system is incorrect, The solar collectors are not installed on the same plane, which causes stress between the vacuum tubes and the collectors. When the stress limit is reached, the tubes tend to burst.
4. Air drying: Due to the pipe connection causing pipe blockage or valve operation error, water cannot flow into the vacuum tube and air drying causes the pipe.
5. Scale: The temperature inside the vacuum tube easily reaches 80 or 90 degrees, which can easily produce scale and adhere to the surface of the collector and tube empty. The thermal conductivity of scale is low. and the thickening of the scale layer makes the heat exchange between the heat absorber of the vacuum tube and the heat transfer fluid in the tube blocked, forming a certain temperature difference between the inside and outside of the scale when solar radiation is. good, the temperature of the outer layer of the scale is higher, forming a greater temperature difference with the inner layer, causing cracks, the cold liquid in the tube enters the inner wall of the glass along the cracks, which can easily cause. the tube explodes.
6. Quality defects of the vacuum tube itself: Vacuum tube collectors generally use borosilicate glass, but borosilicate glass with an expansion coefficient greater than 3.4 × 10-6 is not easy to make into tubes empty. changes in the composition and structure of the glass. There has been a changeimpair performance, which may cause the tube to explode. Therefore, borosilicate glass with an expansion coefficient of 3.3 is usually used.