早期電子廠冰水供應系統通常考量初設成本因素而採單一冰水溫度供應，所以冰水系統設計時是以最低需求設備的溫度點作爲供水溫度，其他較高溫度設備常使用二次熱交換器或是區域混水方式，將低溫冰水提升到高溫冰水再供給需求設備使用，如面板廠中所使用的冰水就有7°C跟14°C之分。而所謂雙溫冰水系統則是設置兩套冰水系統，ー爲高溫冰水系統，另ー爲低溫冰水系統。因製造低溫冰水比高溫冰水需要耗更多的能量，而冰水系統運轉耗能爲整個工廠前三大用量之一，本文以某面板後段組裝廠將原單溫冰水系統改成雙溫冰水系統供應後進行耗電量分析，每年可節省耗電量3，405，253 kWh，電費約新臺幣9，023，920元（電價2.65元/kWh)，冰水系統節能比率爲14%左右。

Early electronics factories often used single-temperature chilled water systems to reduce initial capital investment. Therefore， water supply temperature was usually designed at the lowest temperature requirement of equipment， and secondary heat-exchangers or local mixing was applied to raise chilled water temperature for other equipment requiring high-temperature chilled water. For example， a panel factory needs chilled water at both 7°C and 14°C. A dual-temperature chilled water system is equipped with one high-temperature chilled water system and one low-temperature chilled water system. As it consumes more energy to produce low-temperature chilled water and the chilled water system is one of the top three energy-consuming factory equipment， this paper analyzed the energy consumption of an assembly plant for panel modules after replacing the single-temperature chilled water system with the dual-temperature
chilled water system. The results showed that a total of 3,405,253 kWh of
electricity or NT$9,023,920 (at NT$2.65/kWh) of electricity bill was saved
each year, with energy saving rate of about 14%.