When I woke up, there was an "ice waterfall" outside the window. This is not a fantasy, but a phenomenon often encountered by residents in some communities during the cold winter season. The reason is that there is no such thing. It is definitely that the solar water heaters in the unit building are not frozen. “Ice Falls†is beautiful, but when it is combined with residential buildings, it is not exciting, but more worried. Winter is here, how do you want to make "solar" safe for the winter?
"Solar energy" Why is it cracked?
The solar water heater itself has the function of heat absorption and heat preservation. Why is it still cracked? In fact, although the solar water heater can absorb heat and keep warm, its working principle is not similar to that of a stove or an incubator, and its heat preservation principle is more similar to a thermos bottle. Since the water-filled thermos will be cracked, it is not surprising that the solar water heater is at risk of being cracked.
The common solar energy "frozen cracking" accident is generally caused by the volume expansion of the internal water after freezing, which causes the water heater vacuum tube and the upper and lower water pipes to burst. Vacuum tubes are the key structure for solar water heaters to exert energy conversion. Water heaters rely on these vacuum tubes to absorb light energy and convert them into heat energy, which is commonly known as “heat absorption deviceâ€. The vacuum tube absorbs enough light energy on a sunny day, so the water inside it generally does not freeze. Therefore, a vacuum tube of acceptable quality is generally not frozen. However, if you encounter a cloudy day or snowy weather for several consecutive days, the vacuum tube will not be replenished due to the long-term exposure to sunlight. The water in the vacuum tube of the solar water heater will freeze into ice and burst. Vacuum tube for water heaters.
The upper and lower water pipes of solar water heaters do not have the function of heat preservation. Therefore, when the outdoor temperature is lower than -5 °C, the water in these places is likely to freeze, which causes the water pipes to rupture.
"Solar energy" antifreeze tricks
With the continuous improvement of the level of technology, the quality of solar water heaters on the market is steadily increasing. These products are becoming more and more “anti-freezeâ€. However, in winter, the “solar†of individual households will be frozen. How to ensure that “solar energy†is safe for the winter has become a problem that people pay more attention to at this stage.
The average family is equipped with a solar water heater antifreeze device, and some people call it a "thaw line." Starting this device is the most direct and effective way to prevent solar water heaters from freezing. The main task of the antifreeze device is to prevent freezing rather than thawing. Some residents do not start antifreeze devices when it is cold, but start the device to thaw when it is found that the solar water heater can't discharge water. This is not advisable. Residents are advised to pay attention to the weather forecast in a timely manner. When the outdoor temperature is lower than -5 °C, the thawing device should be turned on in time. Do not wait until the water pipe is frozen before thawing. For solar water heaters without antifreeze heating cable, you can only choose to use the traditional drip antifreeze method. If the weather is cold, you can open the hot water nozzle or faucet, place a water basin underneath, and loosen the hot water valve. Twist to the minimum and keep a drop of water dripping out to avoid freezing the hose.
For the water pipes of solar hot water exposed to the outdoor water pipes, it is necessary to pay attention to the anti-freezing measures. The cotton and linen fabrics, plastic foams, etc. can be used for the wrapping and heat preservation; the water pipes should be installed with the water storage emptying device to discharge the water and prevent freezing. If the temperature in winter is too low or the solar water heater is not used for a long time, it is necessary to close the water supply valve of the water heater, and vent the water of the upper and lower pipelines of the water heater to avoid the phenomenon that the temperature is too low and the water lacks circulation to cause the water pipe to freeze and crack. Snow cover is a major cause of the failure of the water heater vacuum tube to absorb light energy and cause cracking. After the heavy snowfall on the day, it is recommended that professionals should promptly clean up the snow of some vacuum tubes when conditions permit, but be sure to pay attention to the safety of personnel.
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