When the solar panel is working, its own temperature is not high, but in summer, it absorbs a lot of heat.
So the surface temperature is sometimes very high...
Solar Photovoltaic Energy The efficiency of solar panels will decrease due to excessive temperature.
For a standard photovoltaic panel, efficiency will decrease by 0.5% for every 1 degree Celsius increase in temperature.
So it is better to lower the temperature appropriately
Advantages of flat panel solar collectors
1 It is safe and does not not explode. It is currently the best choice for all balcony wall-mounted water heaters.
2. There are no restrictions on the installation of flat panel solar collectors. It can be installed on the south balcony, wall, awning, wall between windows, etc. balcony, bathroom or next to the air conditioner. It is suitable for various architectural design requirements.
3. Since the flat panel solar water heater has a simple structure, is easy to process, and is easy to produce on a large scale, it also has the characteristics of low manufacturing cost, low installation cost and long lifespan.
Disadvantages of flat solar collectors
1. Flat solar collectors have problems such as high heat loss and antifreeze. The "Tianzi" flat solar collector circulates the antifreeze, so there is no antifreeze problem and heat loss is reduced to a minimum.
Advantages of vacuum tube solar collectors
1. The heat loss of evacuated tube solar collectors is relatively small
Disadvantages of evacuated tube solar collectors
1. Water circulation in the vacuum tube solar collector presents the problem of freezing and damaging the vacuum tubes in winter.
2. If the vacuum tube solar collectoris used for a long time, it will produce scale depending on the water quality. The worse the water quality, the worse the scale will be.
3. Due to the relatively high operating temperature of the vacuum tube collector, it is easy to burst the tube when suddenly exposed to cold or heat.
Detailed information:
Operating principles of flat plate solar collectors and evacuated tube solar collectors
1. collectors
Sunlight shines through the transparent cover onto the heat absorber with an absorption layer on the surface. Most of the solar radiation is absorbed by the absorber, converted into thermal energy and transmitted to the fluid channel. substance. In this way, the cold working fluid entering from the bottom of the collector is heated by solar energy in the fluid channel and the temperature increases progressively.sively.
The heated thermal fluid carries useful thermal energy from the upper outlet of the collector and is stored in the water storage tank for later use, which constitutes the useful energy gain. At the same time, due to the temperature increase of the heat absorber, heat is lost to the environment through the transparent cover and shell, causing various heat losses in the flat solar collector.
2. Vacuum Tube Solar Collector
Uses the heat-absorbing coating of the inner tube to absorb sunlight, heats the water in the inner tube and exchanges it with the water tank or housing. connection. Increase the water temperature. As a heat collecting plate, it absorbs heat and dissipates it at the same time. There are only three ways to transfer heat: radiation, transmission.Guiding, convection.
The tThree vacuum tube solar energy dissipation and heat transfer methods are all very small. The mercury coating of the inner tube prevents thermal radiation; the vacuum layer between the inner and outer tubes prevents heat conduction; for heat dissipation by convection, the solar energy of the vacuum tube is very large, almost zero. The thermal efficiency reaches 93.5%, which is 50-80% higher than that of flat panel solar power.
Reference materials:
Baidu Encyclopedia - Flat Plate Solar CollectorBaidu Encyclopedia - Evacuated Tube Solar Collector< /p >