在所有再生能源當中，最為乾淨、環保、且取之不盡用之不竭的便是「太陽能」，但是市售太陽能相關產品之中最讓人匪夷所思的便是太陽能熱水器，為何號稱使用的是最為乾淨環保的再生能源卻反而不節能呢？原因是第一代傳統型熱水器儲水桶的設計並不理想，當我們使用熱水時，一邊消耗熱水的同時會一邊補入冷水，造成儲水桶內熱水溫度明顯下降，必須另外使用電能輔助器進行加熱，因此提高其他能源的耗用。針對市售第一代儲水桶的缺點，有廠商提出第二代改良型熱水器儲水桶，其解決方式是在儲水桶內加入一「分隔圓盤」，將儲水桶分隔成兩個空間（左邊熱水區右邊是緩衝區），再由一導引管連接兩空間，讓冷水引入儲水桶內時，可以減緩冷熱水的混合速度，本研究便是找出「分隔圓盤」設置的最佳位置，以便讓「分隔圓盤」發揮最大效用。

In the recent time, because of global warming caused by the growing environmental disaster, government and non-government agencies around the world are actively involved in the implementation of energy saving and carbon reducing products and plans. As we know solar water-heater was kind of environment friendly product, but it wasn't. The reason is that the first generation of conventional storage tank water heater design is not ideal .While we using hot water, hot water consumption will make the other side into cold water , this make the water temperature decreased storage bins .So that auxiliary power heating device has to be use , thereby increasing the consumption of other energy sources . In order to slove the weakness of the first generation water-heating tank. The second generation water-heating tank, which put a dividing disk in the tank has been invented. The dividing disk likes partition wall, separating two room inside the tank. There is a aqueduct between the left room and right room. When cold water flows in the tank, it flows in right room first, and flows in left room slowly by aqueduct. This research is willing to find the best position to set dividing disk and make it bring into maximum affect .