What is a typical power usage of the water circulating pump in a split-type solar heating system ?
Typically the ratio between the pump power consumption and the solar energy that you collect free is about 1:200 in domestic solar water heating systems. This means that the circulating pump uses about 0.5% as much energy as provided free by the solar collector. In large commercial / industrial solar heating systems this fraction is even much smaller. It can be as low as 0.1% or less. Q: Somebody told me that the flat panel collector absorption is 88%, which is only about 5% lower than your collector’s. How can GreenLand Systems claim their collector efficiency to be over twice as high as that of many flat panel collectors ? A: When we talk about efficiency, we must also mention the ambient and other factors. Salesmen normally tell you only the good news about efficiency, but can forget to tell you that the peak efficiency of their collector only happens on hot summer days, but not during the rest of the year. GreenLand Systems Solar Collectors can perform very efficiently whole year a
