1. Pressure-bearing operation
The working fluid of the high-efficiency flat-plate collector and system flows in the metal flow channel (copper tube), so it can operate under pressure, resist corrosion, and does not leak.
The inside of a non-pressure vacuum tube contains water. The water directly contacts the glass, which can easily cause temperature stress in the glass and cause it to self-explode (explode the tube).
2． Achieve split installation
The high-efficiency flat plate collector can be separated from the hot water storage tank, structurally meeting the requirements for solar energy and building integration
The non-pressure vacuum tube water heater is A compact all-in-one machine, its structure determines that it cannot be separated
3. Integrated with buildings
High-efficiency flat-panel solar collectors can be made into building components to achieve an organic combination of solar energy and buildings (there are more than a dozen combination solutions for solar building integration), which can completely solve the aesthetic problem of solar energy installation. .
The installation of vacuum tube products is messy, unsightly, and cannot be integrated with the building.
4. Flexible and convenient installation
Due to the split system, each component can be installed independently and can be reserved or embedded during construction;
The installation of the solar hot water system is carried out simultaneously with the building, and the roof Waterproofing and thermal insulation problems are easy to properly solve;
The hot water storage tank is hidden in the basement, attic or stairwell, does not occupy indoor space, avoids roof load-bearing, and does no harm to the building
Each system The safety and reliability of the components meet the relevant requirements of the building.
5. Beautiful and does not damage the building
The high-efficiency flat-panel solar water heating system only has a very light collector part installed on the roof, and the heavy hot water storage tank is placed in the attic, stairwell, basement or bathroom. The roof is not load-bearing, so the building load is very small, (installation) will not damage the waterproofing, it is also beneficial to the roof insulation, and it is also very beautiful.
Evacuated tube solar water heaters have a negative impact on buildings. The hot water storage tank is placed on the roof, which is load-bearing, easily damaged and waterproof, and very unsightly.
6． Safe and reliable
The high-efficiency flat-plate collector is safe and reliable. The glass is tempered and has high strength and is not easily broken. If broken, it is not easy to hurt people. (Can bear a load of 1,500 kilograms without deforming for 16 hours)
The vacuum tube is easily broken, and glass fragments falling from the sky can easily injure people, which is very dangerous.
7. No descaling required
The collector part of the high-efficiency flat-panel solar hot water system does not produce scale, and can maintain efficient heat collection for a long time without descaling, reducing maintenance.
Vacuum tubes are prone to scale, which has a great impact on thermal efficiency. Frequent descaling is required, resulting in high maintenance costs and heavy workload.
8. Self-protection function
The high-efficiency flat-panel solar water heating system has an overheating protection function to ensure safe and normal operation of the system. If the system water temperature is too high, the external heat dissipation of the collector will be accelerated and the temperature will be difficult to continue to rise, thereby inhibiting the growth of system pressure, protecting the system and reducing or preventing the volatilization of the working fluid.
Due to their small heat loss, vacuum tubes are prone to high temperatures, causing the closed vacuum tube hot water system to produce high-temperature steam. The internal pressure in the system is too high, causing system damage and severe volatilization of the working fluid.
9. Achieve maintenance reduction
High-efficiency flat-plate collectors have basically no wearing parts and are highly reliable. The glass does not come into contact with water and will not be damaged due to temperature stress.
It is resistant to hail strikes. Durable, resistant to hot and cold shock. Can be maintenance-free.
Glass tubes are in direct contact with water and are prone to temperature stress and breakage.
10． Ultra-long service life
High-efficiency flat plate collectors have an ultra-long service life, with a design life of more than 25 years and a service life of up to 30 years. (The flat-panel solar energy produced by the United States (BOMN) Energy Technology Group has been installed in 13 buildings in residential areas opposite the Chinese Consulate in the United States. It is still in normal use from 1982 to the present.)
Evacuated tube solar energy The average service life of water heaters is about 8 years, and most small factories have less than 6 years.
11. High heat collection efficiency and large heat gain
The high-efficiency flat plate collector has high heat collection efficiency (transient efficiency intercept 80%) and maximum heat gain.
The daily average photothermal efficiency of the vacuum tube solar water heater is 45, and the heat gain is minimal.
Ordinary flat-plate solar collectors are somewhere in between.
12． Can produce clean hot water
The high-efficiency flat-plate solar collector uses high-purity copper tubes, which are corrosion-resistant and not easy to produce patina. It adopts a double-circulation closed system, which is pollution-free and has good water quality. The clean hot water produced It can meet the first-class water standard and is drinkable.
Evacuated tube solar water heaters basically use direct opening systems. The water is kept in the range of 40℃-60℃ for a long time, which breeds E. coli and nitrite (cancer). The water quality is polluted and belongs to Class II water quality. You cannot drink, you can only bathe.
13. Anti-freeze and anti-freeze
The high-efficiency flat plate heat collecting system uses indirect heating and can be used with antifreeze and other working fluids. Therefore, it has anti-freeze and anti-freeze functions and can also be used in high-cold areas in winter.
Evacuated tube water heaters are mostly plug-in and direct heating methods. The vacuum tubes contain water. The tubes are easy to explode in freezing areas in winter, so they are basically unusable in most areas in winter.
14. Snow melting
The high-efficiency flat plate collector can easily realize the function of snow melting and melting through reverse circulation, so it can be used in snowy areas in winter.
Evacuated tube solar water heaters do not have this function. Once covered by ice and snow for a long time in winter and snowy days, pipe explosion accidents will occur unless the snow is manually cleared in time or the water (water heater) is drained.
15． 1Wide uses
High-efficiency flat plate collectors have a wide range of uses and can be used to produce hot water, hot air and heating.
It can only be used to produce hot water, and it is very limited to expand its functions.
16. Easy to install
The high-efficiency flat plate collector itself is a complete product and is easy to transport and install.
Evacuated tube collectors (or water heaters) are semi-finished products that need to be installed on site and are difficult to transport and install.
17. Comfortable to use
The high-efficiency flat-panel solar water heating system adopts a top-water outlet type. The vertical water tank can be installed on the balcony or bathroom. There is little cold water in the pipe, and hot water is available as soon as it is turned on. It is convenient, comfortable and economical to use. water source.
Evacuated tube water heaters mainly use the falling water type. The water tank can only be placed on the roof. The higher the floor, the more cold water in the pipes, which is inconvenient to use and can easily cause water waste.
18. Stable water temperature
Because the high-efficiency flat-panel solar water heating system adopts the top water outlet method, the hot water and tap water networks are connected. No matter how the tap water pressure fluctuates, the hot water pressure and cold water pressure are always consistent, and the mixing valve adjusts After the water temperature is adjusted, the water temperature will be relatively stable.
Evacuated tube water heaters mostly discharge water from a height difference, and the pressure is very small and stable. However, cold water is affected by the pressure of the tap water network and fluctuates high and low. The mixed water temperature fluctuates hot and cold, making it difficult to stabilize and control. The cold water pressure will be high and the hot water will be pushed back, indicating the cold water phenomenon.
19. Advanced technology
The heat-absorbing plates and pipes are fused together through laser welding. The bonding force is strong, the thermal resistance is small, and they are welded on the back without damaging the heat-absorbing film layer. The board core is beautiful.
The bonding force of ultrasonic waves is weak, and welding on the front of the heat absorber destroys the heat absorption film layer, reduces the heat collection efficiency, and is very unsightly.
20． Integral heat-absorbing plate
The heat-absorbing part of the plate core of the high-efficiency flat-plate collector uses an entire heat-absorbing plate to form an insulation layer in the collector, limiting heat convection and reducing heat loss.