Page 10 - CESL Asia E-Newsletter - 6th ISSUE

C&M: What is CPV technology 收的陽光傳送到另一電池。而 and its advantages? 這些透鏡及棱鏡需要根據太陽 的位置才能收集太陽的直接輻 Carlos: Photovoltaics (PV) is a 射(DNI)。 technology that uses sunlight to produce electricity, which can be 普遍來說，PV技術成本較低並 seen in daily life, such as on a cal- 早於四、五十年前已經被沿用 culator. It works on an effect called 至今；然而CPV卻是一門經過 photovoltaic effect that happens 不斷改良革新的新技術，在氣 in some materials when receiving 候惡劣下仍能減低能源成本， sunlight, releasing energy from the 相對PV技術來說當然更高效。 electrons that allows the produc- tion of electricity. CPV (Concen- C&M: How can we actual- trated Photovoltaics) uses the same ly track the sun effectively the basic principle but uses small PV whole day? cells with extremely high efficien- cy and a system of lenses to con- Miguel: The technology is already centrate the sunlight into the small loaded to the controller of each 問：我們怎樣才能全日都有效 PV cell. This special PV cells ab- tracker and it has many ways to 追蹤太陽的位置？ sorb a large spectrum of beam from follow the sun. One of them is by the sun that is channeled to the cell GPS coordinate, and MagPow- Miguel：每台追蹤器的控制台 through a lens and a prism. Due er increases the efficiency of the 都已裝設CPV技術，並擁有不 to this system of lens and prism, tracker by going a bit further. As 同追縱太陽的方式。其中一種 to produce electricity, we need to the air has humidity, they use the 為利用全球坐標定位，Mag- track all the positions of the sun, sensors on the trackers to follow Power更提高追蹤器效率。因 using the direct radiation, known the locations of the sun. Physical- 為空氣裡存有濕氣，故利用安 as direct normal irradiance (DNI), ly speaking, we have two motors 裝在追蹤器上的感應器進行追 7 from it. moving the tracker to follow the 蹤工作。具體來說，我們公司 sun’s path. If there are clouds, the 的追蹤器都由兩組發動機驅動 In general, PV is less expensive trackers will keep following where 來進行追蹤工作。倘若當日太 and it has been used for around the sun goes. If the clouds disperse, 陽被雲層遮蓋，追蹤器卻能繼 40 to 50 years. However, CPV is the tracker is already positioned to 續追蹤太陽位置；當雲層散 a new technology and is running receive the energy from the sun. 退，追蹤器便已在所需位置 its path along its learning curve. 了。 However, in certain odd climates, CPV can still lower the cost of energy. In that case it is definitely C&M = Communications and Markeing Department more effective compared to PV. 問：何謂聚光光伏技術(CPV)？ 它有何優點？ Carlos：太陽能光伏(PV)是一種 利用陽光來進行發電的技術， 於日常生活中隨處可見，如應 用在計算機上。當吸收了足夠 陽光，技術便會在特定物質上 產生「光伏效應」，從電子釋 出能量，產生電力。CPV，即 聚光光伏技術，運用相應原 理，但採用極高效益的微小PV 電池；此技術以一系統的透鏡 將陽光集中到這些小型PV電池 上，再透過透鏡及棱鏡把所吸