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Description:
[China]
Open-Loop Split Solar Water Heating System Open-loop split solar water heating system use pumps to circulate household water through the collectors. This design is efficient and lowers operating costs but is not appropriate if your water is hard or acidic because scale and corrosion will quickly disable the system. Open-loop active systems are popular in regions that do not experience subzero temperatures. Flat plate open-loop systems should never be installed in climates that experience sustained periods of subzero temperatures. They may be installed in mild climates that experience occasion subzero temperatures, but freeze protection must be implemented. Closed-Loop Split Solar Water Heating System These systems pump heat-transfer fluids (usually a glycol-water antifreeze mixture) through the collector. Heat exchangers transfer the heat from the fluid to the household water that is stored in tanks. Double-walled heat exchangers prevent contamination of household water. Some standards require double walls when the heat-transfer fluid is anything other than household water. Closed-loop glycol systems are popular in areas subject to extended subzero temperatures because they offer good freeze protection. However, glycol antifreeze systems are more expensive to purchase and install and the glycol must be checked each year and changed every 3 to 10 years, depending on glycol quality and system temperatures
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