本帖最后由 bennywt 于 18-1-2011 09:14 AM 编辑
不对，太阳能的efficiency跟地域的温度没有关系。efficiency跟光子转换成电子比较有关联吧？
而且， ...
坚仔 发表于 24-5-2006 04:52 PM 
对，efficiency和光子转换电力是有关，然而这个技术的约束只停留在理论上：efficiency=29%。请看以下的报道。在室外，因为温度的提升，effective efficiency （这个名词会比较适合）大大被折扣25%。基本的数学你应该懂吧，effective efficiency只剩下7.25%。你觉得适合吗？
回复 bennywt
请问可以详细解说一点吗？为什么热带国家不适合太阳能？
solarMan 发表于 16-1-2011 11:54 PM
TemperatureContrary to popular belief, the efficiency of a solar cell decreases with increasing temperature. The reason for this, is that a higher temperature increases the conductivity of the semiconductor. This balances out the charge within the material, reducing the magnitude of the electric field at the junction. This in turn inhibits charge separation, which lowers the voltage across the cell. It should be noted that a higher temperature increases the mobility of electrons, which causes the flow of current to increase slightly. This increase is however minor and insignificant compared to the decrease in voltage. 
The listed power of a solar cell is the power measured under ideal laboratory conditions, which prescribe a temperature of 25 °C (77 °F). However, on a typical hot summer day, it is not uncommon for a solar cell to reach a temperature of 70 °C (158 °F). A general rule of thumb is that the efficiency of a solar cell decreases with 0.5% for every 1 °C (1.8 °F) above 25 °C (77 °F). This means that on a hot summer day, the efficiency of a solar cell could drop as much as 25%. It is therefore extremely important to keep your solar panels well ventilated. Make sure the wind is able to cool on all sides, including the underside. Another very clever option might be to implement liquid cooling, using the heat captured by the liquid for household heating purposes.
转自：www.solarpower2day.net
文中解释的很清楚为什么高温度不能使用太阳能面板了。如果他的efficiency是没有受到环境因素影响，我国应该是可以看到很多的太阳面板，而不再是集中于hulu而已。因为，我们可以各自产生电源而且还可以把它卖回给TNB。TNB也降低了营运费。这就是现在完美的grid system。再生能源有几个突破口：1）继续使用水力发电（我觉得是最便宜和最环保的）2）使用fuel cell科技，因为现在可以达到efficiency 35%以上然而营运费不便宜因为不普及。3）提高太阳能面板的efficiancy去到至少60-70%，那么就可以克服温度的问题。 | 
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