Solar Evacuated Tube Water Heater All-glass evacuated tube water heater is the most commonly used water heater nowadays. Let's take a closer look at this type of water heater. All-glass evacuated tube solar water heaters convert absorbed solar radiation into thermal energy. Due to unstable solar radiation, in order to use hot water normally on rainy days and at night, it is necessary to configure a heat storage barrel to store thermal energy and stably supply thermal energy dump. Heat storage barrels are generally divided into horizontal and vertical types according to the aspect ratio of appearance.
(1) The temperature is stable. This type of water heater has good temperature stability. As long as there is hot water in the water tank, it will not heat up first and then cool down. But there are also incit’s convenient to use it. You have to fill it with water manually and there is no guarantee of having hot water at all times.
(2) Save costs. Except on cloudy and rainy days, there are no other charges (such as gas and electricity charges) for using solar water heaters. In rainy weather, consumers have to use electric supplementary heaters, which will cost money. This is because the solar water heater still works on rainy days, but the temperature of the hot water produced cannot meet the user's bathing needs. However, the water in the water tank is hot, higher than ordinary tap water, so it is more cost-effective to use in rainy days than ordinary electric water heaters.
(3) Safe use. As no electricity or gas is used, consumers face no risk of electric shock or poisoning, safetyof solar water heaters is therefore very high. However, when consumers use space heaters for bathing, be sure to remember to use leakage protection sockets.
(4) Long life. Because its material is high borosilicate glass, the inner and outer coatings are not oxidized in a vacuum environment and have a service life of more than 20 years without external force.
(5) Strong environmental adaptability. It has low heat dissipation, good thermal insulation effect and strong frost resistance, and is suitable for use in areas where the winter temperature is 0 ~ -20 ℃; the vacuum tube has low typhoon resistance and strong vacuum resistance; The tube is round and is less sensitive to external impacts. Strong resistance to hail.
(6) The thermal efficiency of vacuum tube solar tubes can reach 93%and the thermal efficiency of the system can reach 46%. The thermal efficiency of some evacuated tube solar technology systems can reach 75%, so it can be used directly as boiling water.
As the vacuum glass tube is round, it has the characteristics of naturally following the sunlight source. Coupled with the reflection principle of the reflector, all sides of the glass tube can be illuminated and the heat collection time. is longer. The water temperature is higher, so it can work normally all year round, even in alpine areas. Despite this, all-glass evacuated tube solar water heaters also have some shortcomings. For example, the mouth of the all-glass vacuum tube is directly connected to the inner tank of the collector box with a sealing ring, resulting in poor resistance. Cold and thermal shocks. If the vacuum tube isbroken, stick will cause serious water leakage. In addition, high temperature water in the vacuum tube is easy to form scale, which affects performance.
How many types of solar water heaters are there?
1. Drain the hot water from the solar water heater.
2. Carefully remove the dust seal ring on top of the header tube. If it is very dirty, you can use lukewarm water. Rinse the top with water.
3. Remove the black collection tube. Wear rubber gloves to avoid slipping and bruising. Grasp it with both hands and twist it left and right with a little force. Once it can be rotated, apply upward force to let the heat collecting tube enter part of the water tank, then lift the bottom and gently remove it. . Pay attention to the sealed glass mouth at the bottom to prevent it from being damaged and losing itsvacuum insulation function.
4. Pour the water into the collection tube and pour out the scale at the same time. Remove one, shake it lightly, and pour it in while it's still hot. Then pour water with a spoon, shake and rinse several times until clean.
5. Remove the rubber sealing ring inside the water tank mouth. After removing them all, rinse them with water, especially on the inside, to ensure a good seal with the collection tube.
6. Clean the scale from the water tank. Use a curved tool to remove large areas of tartar, then rinse with plenty of water.
7. Install the rubber seal ring. Use your hands to facilitate installation from the two holes and place it on the stainless steel edge of the water tank. After installing the collection tube, prepare some detergent thinner, rinse the top of the collection tubewith water, apply a little detergent solution and slowly push the top into the water tank. Be careful not to damage the lower vacuum glass nozzle.
8. Add water to test if there is a water leak. Fill with water and check for water leaks. It is recommended to empty the first water tank to remove remaining detergent. If there is no water leakage, just press the dust ring.
Types of Solar Water Heaters Solar water heaters can be roughly divided into the following categories:
1. From the heat collection part:
(1) Glass. Vacuum tube solar energy water heater: can be subdivided into all-glass vacuum tube type, heat pipe vacuum tube type, U-shaped vacuum tube type/vacuum tube heat collection and storage Built-in sun drying type heat. The most commonly used is the all-glass vacuum tube type, which has the afollowing advantages: safety, energy saving, environmental protection and economy. Especially solar water heaters with auxiliary electric heating function, which use solar energy as the main source and electric energy as the auxiliary energy source, so that the solar water heater can work normally all year round and the efficiency is still relatively high when the ambient temperature is low. Its disadvantages are that it is relatively large in size, the glass tube is fragile, scale is easily accumulated in the tube, and it cannot work under pressure.
(2) Flat plate solar water heater: it can be divided into tube plate type, winged tube type, snake tube type, flat box type, round tube type and of heat pipe. Its advantages: good integrity, long life, few defects, low safety risks, capable of operating sou pressure, safe and reliable, large heat absorption area, easy to combine with buildings, and strong resistance to dry air. Its thermal performance is also. very stable. Its disadvantage is that there is no vacuum inside the cover and its thermal insulation performance is poor. Therefore, the heat collection performance is poor when the ambient temperature is low and consumes relatively much energy when using supplementary heating. Thermal efficiency is lower when the ambient temperature is low or when the leaving water temperature must be high. If damaged by freezing, the entire heat collector plate must be replaced. It is suitable for southern regions where there is no ice in winter.
(3) Ceramic hollow flat plate solar water heater: Ceramic solar panels are flat box solar collectors cthin-walled reuse with ordinary ceramic as the base and three-dimensional mesh vanadium-titanium black porcelain as the surface layer. Ceramic solar panels are made of porcelain material as a whole, which is waterproof and waterproof. It has high strength and good rigidity, does not corrode, does not age, does not fade, is non-toxic , harmless and non-radioactive. The absorption rate of sunlight will not attenuate and has high long-term photothermal conversion efficiency.
Tested by the National Solar Water Heater Quality Supervision and Inspection Center, the sunlight absorption rate of ceramic solar panels is 0.95 and the gain of Daily heat of concrete structure ceramic solar roof is 8.6 MJ, which is much higher than the national standard. Ceramic solar panels have low manufacturing and operating costs, do not attenuate the absorption rate of sunlight and have the same lifespan as the building. They can be used to share the structural layer, insulating layer and waterproof layer with the original structure. is simple and the thermal insulation effect is better than the original roof. The concrete structure solar ceramic roof, sun wall and balcony guardrail integrated with the building provide hot water, heating and air conditioning to the building and provide thermal energy for industry; , agriculture and livestock; and can be used for large-scale solar hot water production and wind power generation in deserts, seawater desalination, brackish water desalination and transformation of deserts into agricultural land .
2. Classification from structure:
(1) Compact solar water heater: the evacuated glass tube is directly inserted intons the water tank and the water in the water tank is heated. by circulating the rise in temperature of the heated water, it is the most classic solar water heater on the market.
(2) Split type water heater: The split type water heater separates the collector and the water tank, which can greatly increase the capacity of the solar water heater, does not use not the waterfall working method, and expands the scope of use.
3. Divided by the water tank pressure:
(1) Pressurized solar water heater: The water outlet of the solar water heater is under pressure. Typically it runs on surface water and does not necessarily use a pressurized water tank.
(2) Pressureless Solar Water Heaters: Ordinary solar water heaters are pressureless water heaters. The water tank has a pipe connected to the atmosphere, which takes advantage of the height difference between the roof and the roof. but thewe. The water creates pressure. Its safety, cost and service life are much greater than the pressure bearing type.
Solar water heater is a device that converts solar energy into thermal energy, heating water from low temperature to high temperature to meet people's use of hot water in life and production. Solar water heaters are divided into vacuum tube solar water heaters and flat panel solar water heaters based on their structural shapes. Evacuated tube solar water heaters are mainly used, accounting for 95% of the domestic market share. Household evacuated tube solar water heaters are composed of heat collecting tubes, water storage tanks, brackets and other related parts. The conversion of solar energy into thermal energy mainly relies on vacuum heat collecting tubes which use the hot water principle.of. float and sink cold water to cause microcirculation in the water.