溫差如何發電??

The physics principle involved is the "thermoelectric effect" or "Seebeck effect". It was discovered in 1821, by a German physicist Thomas Johann Seebeck. He discovered that when any conductor is subjected to a thermal gradient, it will generate a voltage. By using a dissimilar metal connected to the original metal to complete the circuit creates a circuit in which the two "legs" generate different voltages, leaving a small difference in voltage available for measurement. That difference increases with temperature, and is between 1 and 70 microvolts per degree Celsius (V/C) for standard metal combinations. Such device is a "thermocouple".

A thermocouple can produce current, which means it can be used to drive some processes directly, without the need for extra circuitry and power sources.


Thermocouples can be connected in series to form a "thermopile", where all the hot junctions are exposed to a higher and all the cold junctions to a lower temperature. The output is the sum of the voltages across the individual junctions, giving larger voltage and power output. Using the radioactive decay of transuranic elements as a heat source, this arrangement has been used in "nuclear batteries" to power spacecraft.

On earth, thermopiles can be used to generate electricity from the heat collected by solar panels.

溫差可以發電?味聽過.....就算有.....溫差必須極大......
首先...先了解發電原理.....一般來說都是運用
以線圈加上強力磁鐵組成的 鍋輪 加上轉動來發電....
當有轉動時[即有動能]...有磁場....加上可被磁化線圈...咁就發到電....
只係單純能量轉換.....動能轉電能.....
一般轉動過程都係將水變成蒸氣來推動.....[因水 平.易得到]
你既溫差係指水由液態轉氣態的溫差[latent heat?]....


假如不是.....面溫差發電又成立....
咁只有將鍋輪放係兩個密封空間.....再加熱其中一個....造成極大溫差.....
通過氣壓轉變....加熱那方因空氣澎漲.[氣壓大]....咁通過高壓去低壓推動 鍋輪
發電.....
不過以我小小的物理角度來看...這方法應冇人用.....因發電量小而用的能量高