Who can talk about the advantages and disadvantages of flat plate solar collector and vacuum tube solar collector
Two. Manufacturing method of flat plate solar collector:The heat collector plate core and its manufacturing method of flat plate solar collector, the plate core consists of two pieces of metal sheets stacked together around the seaming process together, made of flat type metal absorber, and insulation galvanized plate at the bottom, the upper glass plate covered with rubber seal around. The bottom of the groove on the light receiving panel is connected with the back plate by stamping to form a transverse and longitudinal mutually connected working fluid passage.
The advantages and disadvantages of vacuum tube solar collector and flat plate solar collector:Plate solar heat collector:Copper aluminum composite anode plate core collector; all red copper selective coating plate core collector; total copper nitrogen titanium oxide coated plate core collector three kinds.
3 flat plate solar lifespan: a copper aluminum composite process after rolling forming copper and aluminum plate fin heat flow, the surface of the core anodized to form selective heat absorbing coating, or using high-quality selective coating or plating black chromium coating. A. due to the coating material in the sunlight and the oxidation of oxygen in the air, in three to five years began to aging, into a pale white, from the installation of flat panel solar engineering examples can be seen. B. collector to produce copper patina under the action of water, in the water, erosion thinning, especially the welding interface, it is easy to punch in a few years, it is an indisputable fact that the use of copper plate type solar heat exchanger and so. C. flat plate solar collector is a metal tube plate structure, the life of the general 5-8 years after the start of the water leakage and often less efficient. The so-called quality is stable and reliable, maintenance free, that is the performance of the pre installation. Long life 15 years is the industry liar.
Three. Characteristics of flat solar energy:1 flat plate solar in 70s has been invented and applied, since 80s the invention of the vacuum tube solar, solar flat plate in the industry as a whole is slowly out of the market (in Guangdong, Yunnan, Hainan province is still in the promotion and use of solar water heaters), also experienced sunning type solar, flat type solar vacuum tube. Solar energy, the development of vacuum heat pipe type solar energy.2 flat plate solar energy principle is to use the principle of glass greenhouse effect to achieve the heating of hot water. From the way of making it can know the low efficiency of flat plate solar, solar energy enterprises in some high efficiency such as its high absorption rate: alpha s = 92%, the low emissivity epsilon: H = 10%, the average thermal efficiency d = 55%. Is a kind of irresponsible performance. As a kind of heat collecting plate, it also absorbs heat and heat transfer in three ways: radiation, conduction and convection. The three kinds of heat transfer and heat transfer of flat plate solar energy are obvious, and the emissivity increases with the increase of water temperature in the collector. In fact, the thermal efficiency of flat plate solar collector is less than 54%.
