A closed-loop pressurized system uses a propylene-glycol-water mixture that is circulated to the collector using a recirculating pump.
Typically, a flat-plate collector is used, but any type of collector will work. At the collector, the propylene-glycol-water mixture is heated and returned to a solar storage tank that contains a heat exchanger. (In some systems, the heat exchanger is an external component.)
A common mixture of propylene glycol and water is a 50-50 mixture, but the particular ratio depends on the climate and the type of system.
Zhejiang Uniepu New Energy Co ltd(https://www.unipu.com/) is an integrated enterprise professional working on the renewable energy and new material products’ development production and sales since 2009. Our products including solar hot water, solar water heater, solar thermal, solar photovoltaic system for house and solar accessories.
We have been sold worldwide, especially to India, Poland, where we have over 10 years experience , and in Mexico, Chile, Brazil, where over 5 years experience, also we have achieved greater market share in European and South America. We welcome to receive all the inquires.