What are the advantages and disadvantages of vacuum tube solar water heaters?

Summary: Advantages and disadvantages of vacuum tube solar water heater and flat solar water heater

Release time:

2024-09-25 09:15

Advantages and disadvantages of vacuum tube solar water heater and flat solar water heater

Characteristics of flat panel solar energy:

1、 Several types of plate solar collectors:

Copper aluminum composite anodized plate core collector; Selective coated plate core collector with all purple copper; There are three types of all purple copper nitrogen titanium oxide coated plate core collectors.

2、 The manufacturing method of flat solar collectors:

Flat plate solar collector core and its manufacturing method. The core consists of two metal thin plates stacked together, connected together by a biting process around the edges to form a flat plate metal heat absorber. The bottom is lined with galvanized sheet and insulation cotton, the upper part is covered with a glass plate, and the edges are sealed with rubber strips. The bottom of the groove on the light receiving panel is connected to the back plate by stamping, forming a working fluid channel that is horizontally and vertically interconnected.

3、 Characteristics of flat panel solar energy:

Flat panel solar energy was invented and applied in the 1970s. Since the invention of vacuum tube solar energy in the 1980s, flat panel solar energy has gradually withdrawn from the market in the entire industry (still being promoted and used in Guangdong, Yunnan, Hainan and other provinces). Solar water heaters have also gone through the development process of soaking solar energy, flat panel solar energy, vacuum tube solar energy, and vacuum heat pipe solar energy.

The working principle of flat panel solar energy is to use the principle of glass greenhouse effect to heat hot water. The low efficiency of flat panel solar energy can be known from its production method. Some solar energy companies explain its high thermal efficiency, such as high absorption rate: α s ≥ 92%, low emissivity: ε h ≤ 10%, and daily average thermal efficiency η d ≥ 55%. It is an irresponsible behavior. As a type of heat collector, it absorbs heat while also dissipating it, and there are only three ways to transfer heat: radiation, conduction, and convection. The three heat dissipation and transfer methods of flat panel solar energy are all obvious, and the emissivity increases with the increase of water temperature in the collector. In fact, the thermal efficiency of flat panel solar collectors is less than 54%.

What is the difference between a hot water heating system with the same or different processes?

Heating principle of solar energy system

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