太陽熱給湯システムの基礎自治体別CO<sub>2</sub>削減ポテンシャル  [in Japanese] CO<sub>2</sub> Reduction Potential of Solar Water Heating Systems on a Municipal Basis  [in Japanese]

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Author(s)

    • 清水 恭亮 SHIMIZU Kyousuke
    • 横浜国立大学大学院環境情報学府 Graduate School of Environment and Information Sciences, Yokohama National University
    • 本藤 祐樹 HONDO Hiroki
    • 横浜国立大学大学院環境情報研究院 Graduate School of Environment and Information Sciences, Yokohama National University
    • 森泉 由恵 MORIIZUMI Yue
    • 横浜国立大学大学院環境情報研究院 Graduate School of Environment and Information Sciences, Yokohama National University

Abstract

<p>本研究では,国内の地域の自然・社会条件を考慮して,戸建住宅における太陽熱給湯システム(自然循環型)のCO<sub>2</sub>削減ポテンシャルを評価した。現在利用されている灯油,LPG,都市ガス,電気を燃料とした従来型給湯器を太陽熱温水器で代替した時のライフサイクルCO<sub>2</sub>削減量を基礎自治体別に推計した。CO<sub>2</sub>削減ポテンシャルの推計結果は,156~589[kg-CO<sub>2</sub>/世帯/年]と地域によって大きく異なった。CO<sub>2</sub>削減率も同様に11.1%~28.7%と大きな幅があった。また,日本におけるCO<sub>2</sub>削減の総量は673[万t -CO<sub>2</sub>/年]と推計された。各地域のCO<sub>2</sub>削減ポテンシャルは,主に従来型給湯器の燃料種,給水温度,気温の3つの要因から影響を受けていた。中国地方のような電気温水器所有率が高い地域はCO<sub>2</sub>削減ポテンシャルが大きい。同様に,北陸地方のように給水温度が低い地域もCO<sub>2</sub>削減ポテンシャルが大きい。ただし,北海道のように気温が極端に低い場合は,凍結によって太陽熱温水器が使用できなくなるため,CO<sub>2</sub>削減ポテンシャルは小さくなる。</p>

<p>The present study assesses the CO<sub>2</sub> reduction potential of solar water heating systems (natural circulation) for single-family houses considering the natural and social conditions of local areas in Japan. The life cycle CO<sub>2</sub> reduction is estimated by municipality when installing solar water heaters instead of conventional water heaters (i.e. oil, LPG, natural gas and electricity) used at present. The estimation results reveal that the CO<sub>2</sub> reduction potential greatly varies from 156 to 589 [kg-CO<sub>2</sub>/household/yr] depending on the local areas. The CO<sub>2</sub> reduction rate is also in the wide range of 11.1% to 28.7%. The total CO<sub>2</sub> reduction potential in Japan is estimated to be 6.73 million [t-CO<sub>2</sub>/yr]. Local CO<sub>2</sub> reduction potential is mainly affected by the three local factors: fuel-types of conventional water heaters, feed water temperature and air temperature. The local areas where electric water heaters are widely used (e.g. Chugoku region) have high CO<sub>2</sub> reduction potential. Similarly, the local areas with low water temperature have high CO<sub>2</sub> reduction potential (e.g. Hokuriku region). However, when air temperature is extremely low, the CO<sub>2</sub> reduction potential is small because solar water heaters do not operate due to freezing (e.g. Hokkaido region).</p>

Journal

  • Journal of the Japan Institute of Energy

    Journal of the Japan Institute of Energy 97(6), 147-159, 2018

    The Japan Institute of Energy

Codes

  • NII Article ID (NAID)
    130007412644
  • Text Lang
    JPN
  • ISSN
    0916-8753
  • Data Source
    J-STAGE 
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