SOLAR ENERGY 太陽能
Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics.
太陽能，是指來自太陽輻射出的光和熱被不斷發展的一系列技術所利用的一種能量，如太陽熱能集熱器，太陽能光電發電。
When sunlight is irradiated on the solar panel, delocalized electrons will be excited. Direct current will be produced when it is connected to a closed circuit. A current inverter needed to be added to transform DC to AC.
太陽能發電，顧名思義是利用陽光來發電。當陽光照射在太陽能電池板上，會激發電池板上的游離電子流動，當它連接在一閉合電路時，會產生直流電。如要將其轉換成交流電，供電器使用，便要加上一個電流轉換器。
Moreover, solar water heating system can supply hot water with a low cost. Inside the system, there are solar collector, water storage tank, heat pipe vacuum tube, etc. When the solar collector is heated up by the sunlight, the surface temperature will increase together with temperature dropping of water inside the tube and create a temperature difference. Hot water floats when cool water sinks. Hot water is then stored and used for bathing.另外，當太陽光照射在熱水器上，便會將水加熱，為人們提供低成本的熱水。太陽能熱水器的配件有集熱器、儲水器和傳導管等等。當集熱器受陽光照射時，其表面溫度上升，背面的溫度相對較低，使管內的水形成溫差，利用熱水上浮冷水下沉的原理，使水產生對流加熱，供人使用。
The electricity generated by solar energy can be used in heat pump. Heat pump transfers heat energy in air to water. Water is heat up and cold air is released. The liquid refrigerant absorbs the heat in atmosphere and change to gaseous state. Gaseous refrigerant is compressed in the compressor. Temperature is then raised. Refrigerant then release the absorbed heat in the condenser and water is heat up again. Gaseous refrigerant is converted back to liquid refrigerant. Refrigerant is depressurized and transferred back to the evaporator.
而太陽能所產生的電可使用在熱泵上。熱泵是將空氣中的熱能轉移至水中，將水加熱，同時製造冷氣。其原理是熱泵中的液態雪種吸收大氣中的熱能，雪種會由液態轉變成氣態，氣態的雪種在壓縮器中加壓，溫度上升。雪種在冷凝器釋放出吸收到的熱能，將水進行加熱，同時雪種會由氣態變回液態。其後，雪種會進行減壓，並再次送到蒸發器。
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