Why the Flat Plate Collector Can defeat the All Glass Vacuum Collector

 

Particularly suitable for integration with building requirements. Flat solar water heaters because of its planar structural characteristics, in the building integrated application of solar energy, the structure is flexible and free from design or size constraints, easy to achieve with the combination of building components. Plus its collector plate for the metal material, can facilitate the use of silk knot, welding and other connections for the installation, maintenance and use to provide a convenient.

With a high thermal efficiency. Because the vacuum tube solar collector is composed of a number of vacuum tubes, there is a gap between the tubes in the sunlight, there is a part of the solar energy is not accepted by the collector. Flat solar collectors is a continuous plane, the collector surface can accept sunlight. Therefore, in the same lighting area and sunlight intensity, flat solar water heaters, the average daily efficiency is generally higher than the vacuum tube solar water heater average daily efficiency of more than 6%.

Has a good pressure performance. As the plate heat collector plate is made of metal material, the collector and the tank connection is also used in metal parts, therefore, can withstand the pressure from the tap water and circulating pump. At present, urban water is generally centralized water supply system, water pressure is high, which requires solar water heaters out of the hot water to have a certain pressure, thus reducing the water heater outlet and tap water outlet pressure difference between The use of the user provides convenience and comfort.

Composition of large systems stable performance. For some large places, such as hotels, swimming pools, factories and other places, in the use of solar water heaters, often need a large number of solar collectors constitute a large-scale water supply system. If the use of flat-panel solar collectors, in the collector and the system used between the metal connection, rather than vacuum tube solar water heaters with rubber parts to connect, you can ensure the stability of the entire system.

Therefore, in the establishment of large-scale solar hot water system, often using flat-panel solar collectors.

Two, six aspects of technical comparison and analysis

1. Effective lighting area analysis and comparison

Both the flat plate collector and the vacuum tube collector obtain the energy of the sun through the effective lighting area. Therefore, under the condition of the same large outer collector area, the greater the effective lighting area, the more solar energy is obtained , And vice versa the less. Because flat-plate collector without gaps so the effective area of ​​plate collector collector is greater than the vacuum tube collector.

2. Analysis and comparison of effective hot water

Solar water heaters is the effective number of hot water every day to obtain effective number of hot water, hot water can be released to use, called the effective hot water, put out the hot water is invalid, flat-panel system and vacuum tube system Effective hot water is also very different; flat system board effective hot water is greater than the vacuum tube system.

3 pressure bearing performance analysis

Flat-panel solar water heaters belong to the link between the metal tube, fully able to meet the requirements of the pressure system, but usually the vacuum tube collector water system, the vacuum glass tube and the header or tank contact to explain the use of silicone rubber seals to link, Generally can not meet the requirements of the pressure system, once the system pressure, the vacuum tube and the ring by friction between the force is difficult to resist the system pressure, forcing the tube to move out or fall.

4. Anti-scaling, anti-freeze performance analysis

Solar water heaters and their systems in the north to use a kind of performance is how to prevent scaling and anti-freeze, because it is to improve service life, reduce maintenance costs of the kinds of initiatives. Collector in the north caused by the freezing operation of the ice easily, so most of our flat plate collector system using the return flow emptying technology can also be used double cycle (also known as indirect system or secondary system) from the basic solution to the system anti-freeze topic. To this end, foreign developed countries (such as Australia's solarhart company) solar collectors are mostly the use of double-loop system. Flat-plate collector is most suitable for double-circulation system, and the common vacuum tube collector is not ideal because of the pressure is not suitable for double-loop system. Since the majority of China's solar water heating system for bath water temperature generally required at 60 degrees Celsius, scaling phenomena are not strictly species, but the collector of suspended particulate matter how to eliminate should be concerned about.

5. Product and building integration difficult analysis

Flat solar collectors, whether from the overall shape, structural strength and size are suitable for combination with the building, can flow directly on the roof or embedded in the roof, and can easily become an integral part of roof scaling, and construction Seamless integration, so the flat-plate collector and the building is better than the vacuum tube collector.

6. Product analysis and comparison

Flat-plate collector, the heat loss due to less operating temperature generally requires 60 ℃ does not easily overheating, so scaling less, the sewage mainly through the tank outfall to be addressed. The main maintenance work is to regularly remove the dust collector cover, if the use of tempered glass cover the force will greatly reduce the rate of Wan, we can see the life of flat-plate collector in 50 years.

Vacuum tube collector as the operating temperature is relatively high, suddenly hit the hot and cold easily cracked tube, followed by the vacuum tube and the tank or the box link is the use of silicone rubber seals, alkyne Jiaoxian bad or easy to occur Leakage phenomenon, the other for the north-south vertical tube vacuum tube water heater project or compact, due to poor water quality in some places, there are often the lower part of the vacuum tube suspended solids precipitation, a long time, pipe lighting and heat absorption are affected, so in some places , The use of 3 to 4 years after the need to vacuum tube out for cleaning, maintenance workload. The quality of the vacuum tube itself is good or bad, to a large extent determines the quality of the collector, but also affect the work of hot water works.

From the above seven aspects of analysis, flat-panel solar collector system technology has many advantages, but also the developed countries flat-panel solar collectors accounted for most of the reasons, at the same time, with China's national economic development and living standards Of the progress, as well as the volume of products exports increased year by year, flat-plate collector technology and other new solar collector technology will have more and more room for development.

Third, the performance comparison

Comparison of performance of commonly used water heaters, low-temperature hot water (60oC) demand, based on the total area of ​​the three types of water heater efficiency difference is not large, and based on the area of ​​the heat absorber, flat water heater compared to 25% higher than the advantage. As a general solar hot water project, the best choice is to use flat-panel water heater (thermal performance report from the Swiss SPF Test Center website published test report).

As we all know, the water heater efficiency equation based on different reference area, water heater efficiency equation of the different parameters, the difference is relatively large. As a manufacturer, the general need to give the total area of ​​the water heater (floor area), lighting area, heat absorber area of ​​three data for design selection. Based on the area of ​​the heat absorber, the general vacuum tube water heater slightly higher, but due to its structure, its total area is generally large, based on the total area, the flat-panel water heater the best, instantaneous efficiency compared to 50% higher than the total water heater area The number of water heaters can be installed, so, in comparison, in order to achieve the same effect, the smallest number of flat-panel water heaters, the best return on investment.

Fourth, other aspects of comparison

Solar water heaters thermal efficiency: 52.5% higher plate, vacuum tube 47% lower.

Solar Water Heater Price: Plate higher, lower vacuum tube.

Solar water heater pressure: flat-plate can be pressure, so that shower convenience, vacuum tube is not pressure, easy to break.

Solar water heater junction scale: flat water heater can be sewage, not easy to scale, the bottom of the vacuum tube seal, easy to scale, reduce thermal efficiency.

Solar water heater life: flat 50 years, vacuum tube 15 years.

Solar water heater durability: flat-plate high strength, durable, will not burst pipe, under the hail when the cover glass protection, vacuum tube will be damaged, no water, the hot vacuum tube suddenly add cold water pipe, directly under the hail damage Vacuum tube itself.

Tip: thermal efficiency value for the 1994-1997 national test average. Plate thermal efficiency is higher because the vacuum tube heating surface is not complete, but also between the pipe and pipe to stay out of the construction installation gap.

From the above comparative analysis can be seen, flat-panel solar water heaters than the vacuum tube solar water heaters to be more advanced, along with economic development and energy demand, China's solar water heaters will gradually flat-panel solar water heater over to the international advanced solar water heater Energy saving standard.

Fifth, the input and output comparison and analysis

At present, the vacuum tube solar collector on the market a ton of water the system price of about 20,000 yuan to 2.5 million, the service life of publicity for 15 years during the vacuum tube solar collector system maintenance costs (normal operation, no natural Disaster situation) about 10% of the total price. 15 years a ton of water, the total operating price of solar energy systems in the 50,000 to 65,000 yuan between the above prices in the plain areas considered in the Northeast or the plateau region, the operation and maintenance costs need to take into account 20%;

Flat-panel solar collectors one ton of water system price of about 20,000 to 30,000 yuan, the service life of publicity for 50 years, during operation flat blue film solar collector system maintenance costs (normal operation, no damage) about The total price of about 5%, 50 tons of water a flat-panel solar system operating price of the total 98,000 to 105,000 yuan, because the performance of flat-panel solar energy than the advantages, both in the Northeast or the plateau area can be.

Comprehensive comparison of the above can be seen from the data, the overall operating costs of flat panel solar far less than the vacuum tube solar energy, and its superior performance quality is unmatched vacuum tube solar energy.

After reading this article, and finally clarified the advantages and disadvantages of flat-plate collector and vacuum tube collector, in terms of performance and operating costs, etc., flat plate collector vacuum tube collector winners are victory. In the industry has a "flat-panel king is not only" reputation of the Ka-pass, is the preferred brand of solar water heating systems engineering.