In recent years, several comparative life cycle analyses have shown that increasing the use of wood in buildings can reduce the life cycle primary energy use and carbon emission of buildings. This study reviews the life cycle inventory methodology of primary energy use and carbon emissions, based on ecoinvent database, considering different modelling choices for (i) materials heating values; (ii) biogenic carbon; (iii) calcination and carbonation processes; (iv) electricity production scenarios; (v) impact distribution of multi-functional processes; (vi) post-use benefits. The analysis relates to the standards while the implication of different modelling choice is shown by comparing the primary energy use and carbon emission in the production and end-of-life stages of a multi-storey residential building with concrete, cross laminated timber and modular timber structures, respectively. The results highlight the displacement between different modelling choices in terms of primary energy use and carbon emissions. Such modelling options especially influence the LCA results in the product stage and beyond the end of life stage, and especially wood- and/or cement-based materials.

近年来，一些比较生命周期分析表明，增加建筑中木材的使用可以减少建筑生命周期的一次能源使用和碳排放。本研究回顾了一次能源使用和碳排放的生命周期清单方法，基于ecoinvent 数据库，考虑了（i）材料热值的不同建模选择；(ii) 生物碳；(iii) 煅烧和碳酸化过程；(iv) 电力生产情景；(v) 多功能进程的影响分布；(vi) 使用后福利。分析涉及标准，同时通过比较混凝土多层住宅建筑在生产和报废阶段的一次能源使用和碳排放，显示不同建模选择的含义，分别是交叉层压木材和模块化木结构。结果突出了不同建模选择在一次能源使用和碳排放方面的位移。此类建模选项尤其会影响产品阶段和生命周期结束阶段之后的 LCA 结果，尤其是木材和/或水泥基材料。