In 2011, the Consumers’ Association warned that 40.87% of solar winters did not work, and this news caused an “earthquake†in the industry. A large domestic company took the lead in introducing a product, and changed the "device" to "machine", indicating that solar energy is still used in winter to make it look right.
So can solar "winter" work? Let's take a scientific look:
First of all, solar energy is not used in winter. The main reason is that the heat collection and heat preservation are not necessarily correct. It is not necessarily correct to condemn SMEs for their actions. They should denounce the bad results caused by the low price and bare price war. For example, in Jiaxing Solar Energy Group, the quality of the vacuum collector tube is uneven, and the quality of the vacuum collector tube is detected. The overall quality parameters: transmittance 0.92, absorption ratio 0.94, hemispherical emission ratio 0.017, air drying 254, boring drying 4.2, vacuum The quality of 4% exceeds the national standard, and a large amount of poor quality must not reach the national standard. But the poor sells well, but it does not sell well. There are also seals, 141B foaming materials, control instruments, hot water pipes and connectors, etc., which shows that a large number of assembly companies in the procurement, only the low price does not require quality, heat collection effect is poor, of course, "winter" regardless use.
Second, most solar companies do not have the ability to design, or even do not understand at all. The quality of a solar energy is judged to be “dayly useful heat,†which is an important parameter that embodies thermal performance. Theoretically, it should be derived from the formula: Daily useful heat = (4186.8 × riseable temperature × available water capacity) ÷ heat collection area, Calculated. Many companies can not even calculate the temperature, the available water capacity, and the heat collection area, and they will simply imitate. Therefore, there have been regulatory standards and price phenomena. However, they do not know that its specifications are: water volume/lighting area/rated pressure. Whereas the test conditions are on the (average) day when the solar radiation is 17MJ/m2, the water temperature is 20°C, the ambient temperature is 15°C to 30°C, and the air flow rate is 4M/S, then the sunshine and temperature in different regions are different. The heat gain should also be different, requiring only a useful amount of heat above the date of the test, and "winter" can be used. Of course, we must also consider the effect of the insulation of the tank and pipeline.
Third, as to whether it is necessary to use large pipes or long pipes, it is still worth discussing. Collecting heat does not mean using thick pipes or long pipes. The long tube heat exchange time is long, the thick tube does not necessarily collect heat, and the single-target and three-target coatings have their own advantages. The diameters of the U.S. and Japan are only 37mm and 47mm. Many of our companies do insert hollow tubes in the middle of 70mm. The water is small and the heat is high. However, it is very easy to foul, and the heat collection efficiency decays faster. 1900 long tube is not a way to "machine" on behalf of "device" is just a hype.
Fourth, heat preservation, should advocate full heat preservation. For example, a small and medium-sized enterprise advocates vacuum tubes with a high degree of vacuum, water tank insulation materials and seal rings are used well, heat loss of pipes can be reduced, and so on. A series of “whole thermal insulation†measures are strictly required. Since then, solar energy “winter†Also useful. Of course, all-in-one intelligence is also important. The temperature and temperature readings of the sensor in the control instrument must be accurate, and the service life is long. The operation status of the solar energy can be known at all times. If necessary, effective measures can be taken. Heating or thawing is a solution.
I think that there are always fantastic opportunities behind the crisis. This "earthquake" does not need to panic at all. It "shock" is just right, it just "shocked off" the unhealthy trend, and "shocked out" the persistent industrial scourge. , Those enterprises with large, medium, and small consciences; companies that do their hard work in products that do not cut corners; those that do not fight price wars; those that do a good job in after-sales service, are highlighted. At the same time, it also “shocked out†the high quality solar energy available to consumers in winter.
So can solar "winter" work? Let's take a scientific look:
First of all, solar energy is not used in winter. The main reason is that the heat collection and heat preservation are not necessarily correct. It is not necessarily correct to condemn SMEs for their actions. They should denounce the bad results caused by the low price and bare price war. For example, in Jiaxing Solar Energy Group, the quality of the vacuum collector tube is uneven, and the quality of the vacuum collector tube is detected. The overall quality parameters: transmittance 0.92, absorption ratio 0.94, hemispherical emission ratio 0.017, air drying 254, boring drying 4.2, vacuum The quality of 4% exceeds the national standard, and a large amount of poor quality must not reach the national standard. But the poor sells well, but it does not sell well. There are also seals, 141B foaming materials, control instruments, hot water pipes and connectors, etc., which shows that a large number of assembly companies in the procurement, only the low price does not require quality, heat collection effect is poor, of course, "winter" regardless use.
Second, most solar companies do not have the ability to design, or even do not understand at all. The quality of a solar energy is judged to be “dayly useful heat,†which is an important parameter that embodies thermal performance. Theoretically, it should be derived from the formula: Daily useful heat = (4186.8 × riseable temperature × available water capacity) ÷ heat collection area, Calculated. Many companies can not even calculate the temperature, the available water capacity, and the heat collection area, and they will simply imitate. Therefore, there have been regulatory standards and price phenomena. However, they do not know that its specifications are: water volume/lighting area/rated pressure. Whereas the test conditions are on the (average) day when the solar radiation is 17MJ/m2, the water temperature is 20°C, the ambient temperature is 15°C to 30°C, and the air flow rate is 4M/S, then the sunshine and temperature in different regions are different. The heat gain should also be different, requiring only a useful amount of heat above the date of the test, and "winter" can be used. Of course, we must also consider the effect of the insulation of the tank and pipeline.
Third, as to whether it is necessary to use large pipes or long pipes, it is still worth discussing. Collecting heat does not mean using thick pipes or long pipes. The long tube heat exchange time is long, the thick tube does not necessarily collect heat, and the single-target and three-target coatings have their own advantages. The diameters of the U.S. and Japan are only 37mm and 47mm. Many of our companies do insert hollow tubes in the middle of 70mm. The water is small and the heat is high. However, it is very easy to foul, and the heat collection efficiency decays faster. 1900 long tube is not a way to "machine" on behalf of "device" is just a hype.
Fourth, heat preservation, should advocate full heat preservation. For example, a small and medium-sized enterprise advocates vacuum tubes with a high degree of vacuum, water tank insulation materials and seal rings are used well, heat loss of pipes can be reduced, and so on. A series of “whole thermal insulation†measures are strictly required. Since then, solar energy “winter†Also useful. Of course, all-in-one intelligence is also important. The temperature and temperature readings of the sensor in the control instrument must be accurate, and the service life is long. The operation status of the solar energy can be known at all times. If necessary, effective measures can be taken. Heating or thawing is a solution.
I think that there are always fantastic opportunities behind the crisis. This "earthquake" does not need to panic at all. It "shock" is just right, it just "shocked off" the unhealthy trend, and "shocked out" the persistent industrial scourge. , Those enterprises with large, medium, and small consciences; companies that do their hard work in products that do not cut corners; those that do not fight price wars; those that do a good job in after-sales service, are highlighted. At the same time, it also “shocked out†the high quality solar energy available to consumers in winter.
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