本文采用基于火用的成本核算方法对南伊利诺伊大学卡本代尔分校（SIUC）的中央冷冻水系统进行评估，以量化内部损失的大小和成本影响，从而最大限度地提高制冷机容量利用率，并最小化输送冷冻水的单位成本。两个独立的系统分别由一级、二级和三级配电网络组成，并由12300 kW（3500 RT）蒸汽涡轮驱动的离心式制冷机冷却，利用能量、火用和成本的稳态速率平衡将其建模为控制容积网络。2006年冷却季节收集的大量测量数据被用作模型的输入数据。结果表明，汽轮机是最大的（火用）破坏源，而在低冷负荷下，分配回路中的混合是（火用）单位成本的主要来源，在高负荷下，制冷循环损失是（火用）单位成本的主要来源。 建议包括:（1）将冷冻水分配转换为全变速、直接耦合配置；（2） 在低冷负荷期间，仅使用一台冷却器；（3） 在高冷负荷期间，增加通过蒸发器的水流量；（4） 有利于对进口导叶进行速度控制，以实现容量调节；（5） 更好地隔离蒸汽管道；（6）考虑用变速电机代替汽轮机。单位:双引文:ASHRAE交易，第115卷，第。2009年1月1日，芝加哥

This paper evaluates the central chilled water system of the Southern Illinois University Carbondale (SIUC) campus using exergy-based cost accounting to quantify the magnitudes and cost impacts of internal losses with the goals of maximizing chiller capacity utilization and minimizing the unit cost of delivered chilled water. Two independent systems, each comprised of a primary-secondary-tertiary distribution network and cooled by a 12,300 kW (3,500 RT) steam-turbinedriven centrifugal chiller, were modeled as control volume networks using steady-state rate balances for energy, exergy, and cost. An extensive set of measurements, collected over the 2006 cooling season, was used as the input data for the models. Results show that while the steam turbines are the largest source of exergy destruction, mixing in the distribution loops is the dominant source of exergy unit cost at low cooling loads, and refrigeration cycle losses dominate costs at high loads. Recommendations include: (1) Convert the chilled water distribution to an all-variable-speed, direct-coupled configuration; (2) During low cooling loads use only one chiller; (3) During high cooling loads, increase the flow rate of water through the evaporators; (4) Favor speed control over inlet guide vanes for capacity modulation; (5) Better insulate steam piping; and (6) Consider replacing the steam turbines with variable speed motors.Units: Dual