http://baike.baidu.com/view/297838.htm The efficiency of photosynthesis is written above. While the efficiency of large-scale solar cells is around 10%, a group from the Chinese Academy of Sciences is said to have successfully increased the efficiency to 15%. So of course solar cells are high.
Problems of energy conversion efficiency of solar street lights in college physics
Efficiency of different energy conversion methods
Conversion methods Energy Energy efficiency
Internal combustion engines and external gas turbine 10%～50%
Gas turbine engine can reach up to 40%
< p>Gas turbine engine and steam turbine engine (combined cycle) can reach up to 60%Hydraulic engine can reach up to 90%
Wind engine can reach up to 59% (theoretical upper limit)
Solar battery
6%～40%< /p>
(Dependsof use technology, the general efficiency is about 15%, the theoretical upper limit is 85%-90%)
Firearms ~30% (0.300 inch bullet) [ 0.3 inch≈7.62mm]
Fuel cell can reach up to 85%
Water electrolysis 50%-70% (the upper limit theoretical is 80% to 94%)
Photosynthesis effect up to 6%
Muscle 14%～27%
Motor
Small motor with power less than 10 watts: 30%～60%;
Motors with power between 10 and 200 watts: 50% to 90%
Motors a power greater than 200; watts: more than 99%.
Home refrigerator low-end system is about 20%, high-end system is about 40-50%
Bulb 5%-10%
p>
Light - light-emitting diode Max. At 35%
Fluorescent lamp 28%
Sodium lamp 40.5%
Metal halide lamp 24%
Switching l The power supply can bere used in practical applications 95%
Electric water heater 90%～95%
Electric heater about 95% [1]
What is -what is the general photoelectric conversion efficiency of solar cells
First calculate the energy used by the street light to operate: 30*70*3600=7560000d
The energy of solar radiation is 21,000,000 j
Efficiency is work energy/energy of solar radiation = 7560000/21000000 = 36%
Conversion rate of energy in the electric power industry
The upper limit of the theoretical photoelectric conversion efficiency of silicon solar cells is about 33%.
How to calculate solar PV conversion efficiency: ?
System efficiency = battery module conversion efficiency X inverter efficiency X system loss Consumption. ?
Area X conversion efficiency X1000W/M2 = power. ?
That is: ?
The calculation method of solar cell modules is: module rated power in STC state/(module area * 1000 ).
Taking for example a module with a rated power of 180 Wp, module dimensions of 1580 × 808 × 50 mm (length × width × thickness), and 72 cells of 125 × 125 mm packed in series, the efficiency of the module is: 180/(1.58×0.808×1000)=0.1410=14.10%.
Detailed information:
Advantages of monocrystalline silicon solar panels: high photoelectric conversion efficiency and good stability; the photoelectric conversion efficiency of monocrystalline silicon solar cells is 15% about 24% is the highest, which is currently the highest photoelectric conversion efficiency amongall types of solar cells. Disadvantages: The production cost is so high that it cannot be widely and commonly used in large quantities.
Advantages of polycrystalline silicon solar panels: higher efficiency and lower cost. In terms of production cost, it is cheaper than monocrystalline silicon solar cells. The material is easy to manufacture, saves energy, and the overall production cost is low, so it has been widely developed. In addition, the lifespan of polycrystalline silicon solar cells is shorter than that of monocrystalline silicon solar cells.
Disadvantages: The photoelectric conversion efficiency of polycrystalline silicon solar cells is much lower, and its photoelectric conversion efficiency is about 12%.
Baidu Encyclopedia - Solar Cells
The energy conversion rate in the electric power industryThis is a very complex issue because it involves many different types of energy production technologies. Each technological conversion. prices vary. Here are the conversion rates for some common energy production technologies:
1. Thermal power generation: According to public information, the energy conversion rate of thermal power generation is generally about 35-38%.
2. Hydropower: The energy conversion rate of hydropower is typically around 60-80%. The specific conversion rate depends on the size and design of the hydroelectric plant.
3. Nuclear power generation: The energy conversion rate of nuclear power generation is generally around 33%, but it should be noted that the operation and maintenance costs of nuclear power plants are relatively high.
4. Wind power production: the conve ratersion of energy from wind power generation is typically around 40-60%. The specific conversion rate depends on the design and operating conditions of the wind turbine.
5. Solar Power Generation: The energy conversion rate of solar power generation is generally around 10-20%. The specific conversion rate depends on the type and quality of the solar panels.
It should be noted that these conversion rates are only an approximate reference and the actual conversion rate may be affected by various factors, such as equipment quality, design, environmental conditions, etc.