在许多冷水和热水配水厂中，供水和回水温度差与设计值之间的差异降低是一种情况，导致配水和一次系统能源的严重浪费。这里，通过模拟和现场测试，比较了几种旨在防止delta-T退化的策略。通过热交换器（加热或冷却盘管）的不必要的高流量是delta-T退化的原因之一。限制delta-T或流经热交换器的流量是减少delta-T的两种已知方法- 在一次侧没有降解。介绍了一种称为流量/增量T限制的新策略，并与现有的流量和增量T限制策略进行了比较。研究发现，无论是在进气温度还是水温波动时，流量限制都是优越的。相反，当进入空气湿度或气流速度波动时，delta-T限制更优越。由于影响换热器性能的众多变量通常同时发生变化，因此出现了以下问题:哪种策略最好？通过模拟研究表明，流量/增量- T限制是首选策略，它在保持可接受的换热器性能的同时，提供介于流量和delta-T限制方法之间的结果。不同的方法已应用于两所大学校园获得的数据集，现场测试支持模拟结果。引用:ASHRAE论文CD:2014 ASHRAE冬季会议，纽约

The degradation of the difference between supply and return water temperature from design values is a condition found in many chilled and hot water distribution plants, leading to a significant waste of distribution and primary system energy. Here, several strategies aimed at preventing delta-T degradation are compared using simulations and field tests. Unnecessarily high flow through the heat exchanger (heating or cooling coil) is one cause of delta-T degradation. Limiting either the delta-T or the flow across the heat exchanger are two known approaches to reduce delta-T degradation on the primary side. A novel strategy, termed flow/delta-T limiting, is introduced and compared to the existing flow and delta-T limiting strategies. It is found that flow limiting is superior when either inlet air or water temperature is fluctuating. Conversely, delta-T limiting is superior when either entering air humidity or airflow rate is fluctuating. Because the numerous variables impacting heat exchanger behavior are typically changing simultaneously, the question arises which strategy is best? Through simulation studies it has been shown that flow/delta-T limiting is the preferred strategy that provides results falling between the flow and delta-T limiting approaches while maintaining acceptable heat exchanger performance. The different approaches have been applied to data sets acquired on two university campuses with the field tests supporting the simulation results.