Wind-solar complementary LED street lights use 420W of power, and the power savings can be calculated by comparing the power of traditional street lights and LED street lights. Traditional street lights usually use high-pressure sodium lamps or fluorescent lamps, with power generally between 250W and 400W. To simplify the calculation, we assume that the power of traditional street lights is 300W.
Power saving can be obtained by calculating the power difference between the two street lights. Power saving = traditional street light power - LED street light power = 300W - 420W = -120W.
According to calculation results, LED street lights consume 120W more power than traditional street lights. This is because LED street lights have higher power, so during the same usage time, LED street lights consume more power.
However, the power-saving advantage of LED street lights lies in their higher light efficiency. The light efficiency of traditional street lights is generally between 50-80 lumens/watt, while the light efficiency of LED street lights can reach more than 100 lumens/watt. Light efficiency refers to the brightness produced under unit power. The higher the light efficiency, the higher the brightness produced under unit power.
Assume that the luminous efficiency of traditional street lights is 60 lumens/watt, while the luminous efficiency of LED street lights is 120 lumens/watt. Then the actual brightness of the LED street light can be obtained by calculating the power of the LED street light multiplied by the light efficiency. The actual brightness of LED street lights = LED street light power × light efficiency = 420W × 120 lumens/watt = 50,400 lumens.
The actual brightness of traditional street lights can be obtained by calculating the power of traditional street lights multiplied by the light efficiency. The actual brightness of traditional street lights = 300W × 60 lumens/watt = 18,000 lumens.
By comparing the actual brightness of the two street lights, we can conclude that the actual brightness of LED street lights is 2.8 times that of traditional street lights.
Although LED street lights have higher power, due to their higher light efficiency, LED street lights can use less electricity for the same light brightness. Therefore, although the power of LED street lights is 420W, it still uses less power than traditional street lights.
According to reports, the "new energy-saving street lamp" developed and produced in Wuhan is called "fully permanent magnetic levitation wind and solar complementary street lamp". When choosing a fan with a large wattage, you need to consider the following factors:
1. Solar power generation: How much power a 240Wp solar panel can generate per day depends on the efficiency of the solar panel and the duration and intensity of sunlight. Generally speaking, the actual power generation of solar panels will be lower than the rated power, so calculations need to be made based on actual conditions.
2. Street light power requirements: The power requirements of a street light system depend on the type and number of lamps used. Different types of lamps have different powers. Generally speaking, LED street lamps have lower powers, while high-pressure sodium lamps have higher powers. Based on the street light power requirements, the total power required can be determined.
3. Wind energy resources: Wind energy resources refer to the speed and intensity of wind, usually measured by wind speed. Wind energy resources vary in different regions and need to be evaluated based on actual conditions. Generally speaking, the higher the wind speed, the higher the power generation efficiency of the wind turbine.
4. The power generation efficiency of the wind turbine: The power generation efficiency of the wind turbine refers to the ability of the wind turbine to convert wind energy into electrical energy. Different models and brands of wind turbines have different power generation efficiencies. Generally speaking, the higher the power generation efficiency, the lower the required wind turbine power.
Taking the above factors into consideration, the following calculations can be made:
1. Calculate solar power generation: Calculate the daily solar power generation based on the rated power and actual power generation efficiency of the solar panel.
2. Calculate street light power requirements: Calculate the total power requirements of the street light system based on the type and quantity of lamps used.
3. Evaluate wind energy resources: Evaluate wind speed and intensity based on the wind energy resources in the area.
4. Select the fan power: Select the appropriate fan power based on the solar power generation and street light power requirements. Generally speaking, the power of the fan should be slightly greater than the total power demand of the street light system to ensure that the power demand can be met.
It should be noted that the above calculations are for reference only, and the actual situation may be different. In practical applications, it is recommended to consult professional solar and wind energy system suppliers to design and select based on specific circumstances.
(1) When the wind speed is 10m/s, the output power of each wind turbine is 300W, and the energy obtained by the generator Q is = 5×102J,
Then each wind turbine The power generation efficiency of the wind turbine when working alone:
η=
| P output t |
| Q obtained |
| 300W×1s |
| 5×102J |
(2) The power PL of the light bulb when it is normally emitting light is 45W, then
The radiation power obtained by the solar panel P panel =
| PL |
| η |
| 45W |
| 15% |
Area S=
| 300W |
| 1000W/m2 |
(3) Electric energy that a fully charged lead-acid battery can provide:
W=UIt=25V×18000×10-3Ah=450W?h,
Lamp working time:
t=
| W |
| PL |
| 450W?h |
| 45W |
Answer: (1) Every The power generation efficiency of a wind turbine when working alone is 60%;
(2) The panel area that receives solar energy is 0.3m2;
(3) Fully charged lead-acid The battery can operate the lamp for 10 hours.