At present, the traditional flat plate solar / vacuum tube solar collector thermal efficiency is how much? Don't know don't mess together!!! Thank You for Your Cooperation！！！
If you do not consider the light reflection and refraction, without reflecting plate collector instantaneous efficiency limit, Phi 47 tube: 0.95 x 0.9 x 37/70 = 0.452, Phi 58 tubes: 0.95 x 0.9 x 47/80 = 0.502; if you do not consider the gap between the vacuum tube, instantaneous collector efficiency limit. Phi 47 tube: 0.95 x 0.9 x 37/47 = 0.673, Phi 58 tubes: 0.95 x 0.9 x 47/58 = 0.693; flat plate collector instantaneous efficiency limit: 0.95 x 0.9 = 0.855.
GB: flat plate solar collector instantaneous efficiency intercept = 0.72; vacuum tube heat collector (no reflector) instantaneous efficiency intercept = 0.62; vacuum tube collector (reflecting plate) instantaneous efficiency intercept = 0.52.Note: when the collector area of the vacuum tube collector is calculated, there is a gap between the vacuum tubes and the vacuum tube collector.
Whether it is a flat plate collector or a collector collector, the heat sink efficiency is the biggest influence on the heat sink, that is, the heat absorbing film. Better and better flat film vacuum tube heat absorbing sheet film absorption rate of about 0.95; the flat plate collector the outline area are almost occupied but heat absorbing film, vacuum tube collector influenced by the structure must have a certain distance, generally Phi 47 tube spacing of 70 mm diameter tube spacing is 58 80 mm, with a diameter of 47 mm tube products of the inner tube diameter is Phi 37, Phi 58 tube products within the tube diameter is 47.
