丷黑丷黄金丷老丷人丷I have the honor to answer your question
The medium generally refers to antifreeze
In the north, Antifreeze is ethylene glycol (propylene glycol or glycerin) antifreeze. Heat exchange fluids with different freezing points are selected based on different latitudes. South of the Yangtze River, you must use antifreeze that does not freeze at -10°C. North of the Yangtze River, you should use antifreeze that does not freeze at -20°C. North of the Yellow River, you should use antifreeze that does not freeze at -30°C. Make sure the system does not freeze in winter. In Yunnan and elsewhere, pure water is also used as a heat transfer fluid.
I hope this answer is helpful to you.
How do antifreeze and water work in solar water heaters? Will they mix and will the antifreeze be used up?
Currently, more than 95% of water-based antifreezes use ethylene glycol in the pays and abroad
Compared to tap water, the most important characteristic of ethylene glycol is that it is an antifreeze and the Water cannot prevent freezing. Second, ethylene glycol has a high boiling point, low volatility, moderate viscosity, low change with temperature, and good thermal stability. Therefore, glycol-based antifreeze is an ideal coolant. Antifreeze is a kind of coolant containing special additives. It is mainly used in cooling systems of liquid-cooled engines. Antifreeze has excellent properties such as antifreeze in winter, anti-boil in summer, anti-limescale and anti-corrosion all year round.
Which antifreeze is better for solar, ethylene glycol or glycerol? Ethylene glycol antifreeze is said to be toxic. Is this recommended?
First of all, the antigel does not mix with water, because antifreeze circulates in a closed copper pipe and heat is indirectly exchanged into water by circulating in the copper pipe. Second, under normal circumstances, antifreeze. will not be consumed, but if the pressure of the antifreeze in the copper pipe is too high, the antifreeze will flow into the expansion tank. If there is no expansion tank or the volume of the expansion tank is insufficient, antifreeze will flow from the decompressor. valve.
Of course, glycerol is good and has good performance, but it is also expensive. It is an environmentally friendly antifreeze.
Currently, ethylene glycol is the leading vehicle antifreeze on the market. , because It is profitable, but it is toxic. This poison mainly concerns the environment. If there is a water source nearby, care must be taken to drain the ethylene glycol to avoid poisoning by accidental ingestion.
SIf your solar system is a water heater, use glycerol to avoid leaks and cause accidents to people
If it is not near people, you can use ethylene glycol