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The role of technology, product lifetime, and energy efficiency in climate mitigation: A case study of air conditioners in Japan

机译：技术，产品寿命和能源效率在减缓气候变化中的作用：以日本空调为例

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This study analyzed the impact on the life-cycle CO2 emissions derived from a specific durable good (i.e., household air conditioners in this study) of industrial technology changes, product lifetime changes, and energy efficiency improvements. I proposed a comprehensive structural decomposition analysis including two factors of average lifetime and energy efficiency trend of household air conditioners and applied the decomposition method to the Japanese environmental input-output tables of 1990, 1995, 2000, and 2005. The empirical results show that "Household air-conditioner sector" itself contributed to reducing life-cycle CO2 emissions derived from household air conditioners, while other sectors such as "On-site power generation sector" and "Retail trade sector" contributed to increasing life-cycle CO2 emissions derived from household air conditioners. I also conducted combined scenario analysis about reduction potential of product lifetime and energy efficiency of air conditioners and the results showed the reduction rate of energy efficiency necessary for maintain CO2 emissions in 2005 at 1990 level on each average lifetime scenario. (e.g. if average lifetime of air conditioners is shortened by 1 year, energy efficiency of air conditioners have to be further improved by 20.6% from current level.
机译：这项研究分析了工业技术变化，产品寿命变化和能源效率提高对特定耐用商品（即本研究中的家用空调）产生的生命周期CO2排放的影响。我提出了一种综合结构分解分析，包括家用空调的平均寿命和能源效率趋势两个因素，并将分解方法应用于日本的1990年，1995年，2000年和2005年的环境投入产出表中。实证结果表明：家用空调部门”本身有助于减少家用空调的生命周期CO2排放，而其他部门（例如“现场发电部门”和“零售贸易部门”）则有助于增加源自家用空调的生命周期CO2排放。家用空调。我还进行了有关产品寿命减少潜力和空调能效的综合情景分析，结果显示，在每种平均寿命情景下，保持2005年CO2排放量在1990年的水平所必需的能源效率降低率。 （例如，如果将空调的平均寿命缩短1年，则必须将空调的能效比当前水平进一步提高20.6％。

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