Hello! There are two fluid circulation pipes on the outer heat collecting plate. The top one is the fluid outlet (feed) and is connected to the fluid inlet of the inner water tank (barrel). The fluid inlet (return) pipe under the heat collector plate is connected to the fluid outlet of the inner water tank. This forms an average circulation.
There are 4 pipe connections at the bottom of the indoor water tank, all marked. One of the two remaining pipes is for cold water (tap water, supplemental water) and the other is the hot water outlet.
Which fluid should be added to the solar wall heat storage panel?
Coolant with anti-freeze function. Solar support plus is antifreeze, the full name is antifreeze coolant, so it is a coolant with antifreeze function which can prevent the coolant from freezing and crackingr the radiator and freezing the cylinder block or engine cover when parking in cold winter. Many people think that antifreeze is only used in winter, but in fact antifreeze is used all year round.
In the north, antifreeze is ethylene glycol (propylene glycol or glycerol) antifreeze. Heat exchange fluids with different freezing points are selected based on different latitudes.
In areas south of the Yangtze River, antifreeze that does not freeze at -10°C should be used.
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.
Pure water is also used as a means of heat transfer in Yunnan and elsewhere.