近年來全球暖化的現象日益嚴重，各國亦紛紛提出能助於降低CO2排放之策略。目前國內針對有關CO2減量之方針多半朝用電量及能資源節約著手，至今也有相關研究文獻成果，唯獨對於用水減量的涉獵卻相對較少。一般家庭中多半不知節約用水亦可有效降低CO2之排放，原因在住宅用水的耗能量若與空調系統耗能量相比，相對較小，且其耗電量一般均歸併在電力消耗中，通常不易去查覺耗能的程度及重要性。因此在建築節能對策中，用水耗能是容易被忽略的一環。由鑒於此，本研究嘗試跳脫一般日常耗能節電課題之思考，針對用水耗能部分進行探討。從研究成果得知，一般住宅日常生活使用一度的水約排碳0.492kg，而一度的熱水約排碳6.52kg。再確認一度用水及熱水耗能的基礎下，後續亦針對各類別的用水，建立出用水排碳之推估公式。經本研究可得，人年均於總用水之排碳為224kg，約佔台灣人年均排碳量10.9公噸的2.06%。為使得人年均總用水排碳能有效降低，透過本研究所提出的四項建築節水策略，經推估可使人年均排碳量減少153kg之多，從原先2.06%降至0.6%；住宅部門排碳將具有削減11.4%的潛力，使全國總排放量達到削減1.5%的貢獻，CO2減排潛力由此可見。最後本研究目標，希望能達到政府初使政策2000年的排碳水準，甚至是京都議定書1990年所訂的基準；在每人每日生活用水上達成150公升節水型社會的標準，若是再配合逐年設備與技術的演變，或許可在2020年之前達到100公升的水準。

Since the global warming becomes more serious in recent years, the countries have put forward strategies facilitating the reduction of CO2 emission. However, most of the strategies focus on the conservation of power consumption, energy and resources currently in Taiwan, with numbers of relative literatures and outcomes; but few study on the reduction of water consumption. Common families are seldom aware that water conversation can also reduce the CO2 emission efficiently, because the energy consumption of residential water is relatively smaller than that of air-conditioning system and is added up into the power consumption, which is not so easy to perceive its amount and importance. That is to say, the energy consumption in using water may be easily neglected in energy conversation measures in building. For this reason, this research tries to get rid of the general ideas about daily energy and power conversation, to explore the energy consumption in using water. According to the research results, 0.492 kg carbon will be discharged when using 1.0 m3 of water in daily life generally and 6.52 kg in case of 1.0 m3 of hot water. Based on the reconfirmation of energy consumption when using 1m3 of water and hot water respectively, it works out the prediction equation for carbon emission in using different types of water. From the research, it is learned that the annual average carbon emission per capita in total water used is 224 kg, accounting for 2.06% of the total annual carbon emission of 10.9 metric tons in Taiwan. To efficiently reduce the annual carbon emission in using water, this study proposes four water conservation strategies, which are estimated to reduce 153 kg carbon emission, from 2.06% to 0.6%. The carbon emission of residential water has a potential to be reduced by 11.4%, which contributes a total reduction of 1.5% in national total emission , proofing the reduction potential of CO2 emission. Finally, it is hoped that this research can reach the carbon emission standards made by the government in 2000 or even the baseline by Kyoto Protocol in 1990. Moreover, it may realize the standard of a water-saving society in which each person saves 150 m3 in terms of residential water every day, and even reach the level of 100 m3 before 2020 with the evolutions of technologies and equipments.

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