Views:44 Author:Gloria Huang Publish Time: 2020-11-30 Origin:光伏盒子
As we all know,
Our energy basically comes from the sun on the Earth.
The sun is a hot ball of fire
It radiates light and heat outward at a speed of 300,000 kilometers per second,
making an eight-minute trek to Earth.
According to the amount of heat reaching the earth
Different forms of solar radiation energy conversion
The utilization of solar energy can be divided into
photovoltaic power generation and solar thermal two major categories
Today I will take you to understand "Colder" facts of photovoltaic power generation
As photovoltaic power stations,
Autumn is one of the highest generating seasons.
The sun is shining and the temperature is comfortable.
It is suitable for full power operation of photovoltaic power station
and reach peak generating capacity
Then someone will ask:
It is the sunniest season and better for photovoltaic panels?
This is the sum of the total monthly radiation from a solar resource
at a power station comparison with
full radiation and generating hours per months.
From the picture we can see that,
the highest monthly total radiation was in May and June
but full radiation and generating hours of the highest are April, March,
followed by September and October.
So summer is not what we think that
the highest generating season for photovoltaic power stations.
Why is that?
The reason is that photovoltaic panels are the core part of the solar power system
afraid of high temperature exposure!
Photovoltaic power generation, heat is inevitable
Sunlight is electromagnetic radiation with a wide wavelength range,
When sunlight hits a photovoltaic panel
Radiation may be reflected, absorbed, or transmitted directly
Only that part of the radiation absorbed can be converted into electrical energy
As silicon semiconductor,
the radiation which didn't be absorbed is lost in the form of heat
Of course, there are other thermal factors that affect the efficiency of electricity generation
The consequence is that ---- these factors work together
and will heat these solar panels
Make it higher than the ambient temperature
What is the effect of high temperatures on solar panels?
1. the high temperature causes the solar panel power loss
solar panels have one feature----
the higher the temperature,
the lower the output of solar panels.
At the same time, the part of solar panels are too hot
It will get hot spots, and affect the life of the solar panel.
2. High temperature affects the service life of solar panels
Solar panels are filled with electronics,
heat is produced while working.
The temperature rise has a great influence on the performance of the main components of solar panels.
If the temperature is too high, it will stop working
So solar panels are like any other electronic device,
higher efficiency at lower temperatures.
Because photovoltaics use light instead of heat.
Sum up, solar panels are more suitable for sunny and cool working environments
Autumn is the most "appropriate" season for solar panels
How does solar panels cool down in summer?
If you have a home photovoltaic system
In the heat of summer, how to cool solar panels?
How about an umbrella? NO!
It's very simple
There is no light, photovoltaic power generation is “0”
How about some "sunscreen" ? Also NO!
Use physical sunscreen reduces the absorption of light,
and chemical sun protection.
It doesn't help to lower the temperature
As rooftop solar panels,
natural ventilation for cooling is an economical and practical method.
When installing, leave certain space between roof surface and solar panels,
and avoid leaves and other debris into this gap.
In case the temperature is too high due to poor airflow.
This is why many photovoltaic power generation are often cleaned
To ensure smooth ventilation of solar panels
What changes have photovoltaic power generation brought to our lives?
1. Warm in winter and cool in summer
Solar photovoltaic power generation system, installed on the roof can
absorb a large amount of solar radiation.
Good insulation effect, can play a "warm in winter and cool in summer" effect.
2. Meet agricultural demand for electricity
Photovoltaic agriculture greenhouses adopt steel framework,
It is covered with solar panels.
At the same time, to ensure photovoltaic power generation and crop lighting needs,
promote the healthy growth of plants.
3. Energy conservation and environmental protection
Photovoltaic generation system is a safe, green and sustainable clean energy.
It can save energy and reduce carbon dioxide.