The difference between vacuum tube solar water heaters and flat panel wall-mounted solar water heaters on the balcony:
1. Different market shares
Solar water heaters are divided into. Vacuum tube and flat panel solar water heaters, according to their structural forms, mainly evacuated tube solar water heaters, account for 95% of the domestic market share.
2. Different Working Principles
Home evacuated tube solar water heaters are composed of heat collecting tubes, water storage tanks, brackets and other related parts. relies mainly on vacuum tubes. The vacuum collector tube uses the principle of hot water floating up and cold water flowing down to cause microcirculation of water to achieve the required hot water.
The fins inside the flat collector convert the absorbed solar radiation into energy thermic, causing a continuous increase in the temperature of the working fluid in the heat exchange tube of the sensor, taking advantage of the low density of hot liquid and low density of cold liquid. The biggest feature is that through the circulation pipeline, a natural circulation of cold water from top to bottom and hot water from bottom to top is formed between the collector and the water tank.
3. Different cost performance
The heat collection performance of the vacuum tube type collector is much higher than that of the flat type, and the thermal insulation performance is also much higher than that. flat type. Flat panel solar power has The vacuum tube type has been completely eliminated, and the flat plate collector cannot escape the fate of being eliminated.
Which has a longer lifespan, vacuum tube solar power or flat panel solar power? How manycan years be used?
Advantages of flat solar collectors
1. It is safe and does not burst pipes. It is currently the safest product among all balcony wall-mounted solar water heaters. .
2. There are no restrictions on the installation of flat panel solar collectors. It can be installed on the south balcony, wall, awning, wall between windows, etc. balcony, bathroom or next to the air conditioner. It is suitable for various architectural design requirements.
3. Since the flat panel solar water heater has a simple structure, is easy to process, and is easy to produce on a large scale, it also has the characteristics of low manufacturing cost, low installation cost and long life.
Disadvantages of flat solar collectors
1. Flat solar collectors have problems such as high heat loss and antifreeze. The flat solar collector“Tianzi” circulates the antifreeze, so there is no antifreeze problem and heat loss is minimized.
Advantages of vacuum tube solar collectors
1. The heat loss of evacuated tube solar collectors is relatively small
Disadvantages of evacuated tube solar collectors
1. Water circulation in the vacuum tube solar collector presents the problem of freezing and damaging the vacuum tubes in winter.
2. If the vacuum tube solar collector is used for a long time, it will produce scale depending on the water quality. The worse the water quality, the worse the scale will be.
3. Due to the relatively high operating temperature of the vacuum tube collector, it is easy to burst the tube when suddenly exposed to cold or heat.
Detailed information:
The operating principles of ground sensorsflat plate areas and vacuum tube solar collectorsTheory
1. Flat solar collector
Sunlight shines through the transparent cover on the absorber with an absorption layer on the surface. Most of the solar radiation is energy for the absorber. It is absorbed, converted into thermal energy and transmitted to the working fluid in the fluidic channel. In this way, the cold working fluid entering from the bottom of the collector is heated by solar energy in the fluid channel and the temperature gradually increases.
The heated thermal fluid carries useful thermal energy from the upper outlet of the collector and is stored in the water storage tank for later use, which constitutes the useful energy gain. At the same time, due to the increase in temperature of the heat absorber, heat is lost to the environment through the cover andthe transparent shell, causing various heat losses in the flat solar collector.
2. Vacuum Tube Solar Collector
Uses the heat-absorbing coating of the inner tube to absorb sunlight, heats the water in the inner tube and exchanges it with the water tank or housing. connection. Increase the water temperature. As a heat collector, it absorbs and dissipates heat at the same time. There are only three modes of heat transfer: radiation, conduction and convection.
The three methods of vacuum tube solar energy dissipation and heat transfer are all very small. The mercury coating of the inner tube prevents thermal radiation; the vacuum layer between the inner and outer tubes prevents heat conduction; for heat dissipation by convection, the solar energy of the vacuum tube is very large, almost zero. Thermal efficiency hasreaches 93.5%, which is 50-80% higher than that of flat panel solar energy.
References:
Flat panel solar life: using copper-aluminum composite technology, copper flow channels and aluminum heat-absorbing fins are formed after rolling, the surface of the panel core is anodized to form a selective heat-absorbing coating, or a high-quality selective coating or black chrome electroplating coating is used.
A. Since the coating material begins to age and turn slightly white after three to five years under the irradiation of the sun and the oxidation of oxygen in the air, this can be seen in the examples of flat installations. solar panel energy projects.
B. THEs collector copper tubes tend to patina under the action of water and become thin under water erosion, especially the solder joints.
It will be damaged after some years. There is also no denying that it is easy to puncture, and this is true for both flat plate solar heat exchangers and heat pumps using copper tubes.
C. Flat plate solar collectors are metal tube plate structures whose lifespan usually begins to suffer from water leakage and lower efficiency after 5 to 8 years.
The lifespan of vacuum tube solar power: Since its material is high borosilicate glass and the inner and outer coatings are not oxidized in a vacuum environment , the lifespan is more than 15 years without external force.