本文描述的分析研究了冷冻水系统设计期间工程和经济假设中的不确定性如何转化为常用设计决策指标中的不确定性。使用的指标是基于贴现现金流的效益成本比。该分析是作为一个项目的一部分进行的，该项目正在开发工程工具，用于选择节能冷冻水系统组件、控制装置和操作策略。这些工具包括制冷机和冷却塔的制冷热负荷预测能力、性能数据和模型。本研究的目的是估算负荷和性能数据的精度要求，这些数据将作为冷冻水系统工具的一部分提供。其逻辑是，由于负载和设备性能以外的输入的不确定性，决策指标中存在固有的不确定性，因此，负载和设备性能的准确性进一步提高低于该限度，不会显著提高决策者可用信息的质量。 单元:双引文:研讨会，ASHRAE交易，第105卷，第。1999年2月2日，西雅图

The analysis described here examines how uncertainties in engineering and economic assumptions made during chilled water system design translate to uncertainty in commonly used design decision metrics. The metric used is the benefit-cost ratio based on discounted cash flow. This analysis was performed as part of a project that is developing engineering tools for use in selecting energy-efficient chilled water system components, controls, and operating strategies. These tools include cooling thermal load prediction capabilities and performance data and models for chillers and cooling towers. The purpose of this study is to estimate accuracy requirements for the load and performance data that will be provided as part of the chilled water system tools. The logic is that there is inherent uncertainty in the decision metric due to uncertainty in inputs other than load and equipment performance, and, consequently, there is a limit below which further improvements in the accuracy of the load and equipment performance do not appreciably improve the quality of information available to the decision maker.Units: Dual