1.1 本规程提供了在评估建筑设计和建筑系统时计算和应用回报方法的推荐程序。 1.2 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 投资回报法是一系列经济评估方法的一部分，这些方法提供了投资经济绩效的衡量标准。这一系列评估方法包括生命周期成本计算、成本效益和节约- 投资比率、净收益和内部回报率。 5.2 回收方法考虑到与投资相关的所有货币价值，直到累计净收益（贴现为现值）仅支付初始投资成本为止。 5.3 使用该方法确定项目是否在其使用寿命内或在低于其使用寿命的指定最大可接受回收期（MAPP）内回收其投资成本和其他应计成本。值得注意的是，使用回收方法的决定应谨慎。（参见第节 11 关于限制。）

1.1 This practice provides a recommended procedure for calculating and applying the payback method in evaluating building designs and building systems. 1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The payback method is part of a family of economic evaluation methods that provide measures of economic performance of an investment. Included in this family of evaluation methods are life-cycle costing, benefit-to-cost and savings-to-investment ratios, net benefits, and internal rates of return. 5.2 The payback method accounts for all monetary values associated with an investment up to the time at which cumulative net benefits, discounted to present value, just pay off initial investment costs. 5.3 Use the method to find if a project recovers its investment cost and other accrued costs within its service life or within a specified maximum acceptable payback period (MAPP) less than its service life. It is important to note that the decision to use the payback method should be made with care. (See Section 11 on Limitations.)