Extended lifespan
The thermal fluid inside the solar hot water system is used as a heat transfer fluid, and the thermal fluid mainly uses propylene glycol solution. Depending on the life of the fluid, it should be replaced after 2-3 years to ensure the use effect. In fact, when using solar water heating system, liquid leakage will occur at high temperature and high pressure in summer. . At this point it may be necessary to add more.
Does solar thermal fluid corrode aluminum?
Yes. The reason is that wall-mounted solar panels on balconies rely on heat conduction media (propylene glycol is used in the north to prevent freezing, and pure water and anti-rust additives are generally used in the south) to heat conduction if residents do so. Do not use it for a long time, the water in the bucket will continueto heat and the air in the medium and the system will expand, causing an increase in pressure in the closed space of the water tank. the middle of the exchange system leaks easily. The medium itself will also be consumed during the circulation process, ultimately leading to a lack of medium in the heat exchange system, reducing the contact area of heat exchange and reducing the exchange rate, thereby lowering The water temperature can also cause a vicious circle in which the heat exchange system cannot work properly, affecting the life of the bucket and after two or three years of using the solar water heater, the heat transfer fluid will be lost when heated; affecting the heat exchange effect.
What type of thermal conductive medium can be used for solar photothermal energy production?
No. Solar heat transfer liquid is not corrosive to aluminumum. The metal materials of most indirect solar water heating systems are mainly copper, brass, carbon steel, stainless steel and aluminum. Aluminum is an active metal that reacts readily with oxygen in the air to form aluminum oxide. Aluminum oxide forms a dense gray film on the surface of the aluminum alloy. This film is very durable and can completely separate the inner metal from the outside world. , thus protecting the aluminum inside from corrosion by oxygen in the air.
Photothermal solar power generation uses thermal oil as a heat transfer medium, collects heat at <400°C and generates steam to produce electricity through heat exchange . The operating temperature of thermal oil operates in the high temperature range of 300-400°C. For such a high operating temperature, only biphenyl-dip thermal oilhenyl ether meets the requirements. The applicable temperature range of biphenyl diphenyl ether is 12 to 400°C, and it is the only thermal oil that can be used for photothermal power generation. .