传统的管道热损失计算表明，饮用热水再循环回路具有显著的长度和显著的能量；然而，几乎没有（如果有的话）现场测试数据来验证和量化这种能量损失。本文报告的工作旨在通过实验记录一所高中燃气热水再循环回路系统的能耗和热损失，并通过实验将所述能耗与用于相同最终用途的电阻式点热水系统的能耗进行比较。为了实现这些目标，找到了一个合适的试验场地，对现有的燃气热水再循环回路进行了一段时间的检测和监测。接下来，通过增加再循环回路泵定时器控制，对热水再循环回路系统进行了改造，并对系统进行了额外一段时间的监控。最后，将热水再循环回路系统替换为一组电阻点- 对同一最终用途的热水器的使用情况进行了分析，并对该系统进行了额外一段时间的监控。总监测期为一个日历年。然后，使用每天观察到的实际温度和热水消耗量，对三种系统配置的性能进行分析，就好像它们在整个12个日历月内都在运行一样。因此，在12个日历月的基础上计算了每种配置的能耗、总体交付效率和节能，并给出了结果。单元:双引文:研讨会，ASHRAE交易，第108卷，第。2.

Conventional piping heat loss calculations show that potable hot water recirculation loops having significant length loose significant amounts of energy; however, little, if any, field test data existed to verify and quantify this energy loss. The effort reported here sought to experimentally document energy consumption and heat loss from a gas-fired hot water recirculation- loop system in a high school and to experimentally compare said energy consumption to that of an electric resistance point-of-use water heating system serving the same end uses. To achieve these objectives, a suitable test site was located and the existing gas-fired hot water recirculation loop was instrumented and monitored for a period of time. Next, the hot water recirculation-loop system was modified by the addition of a recirculation-loop pump timer control and the system was then monitored for an additional period. Finally, the hot water recirculation-loop system was replaced with a set of electric resistance point-of-use water heaters serving the same end uses, and the system was further monitored for an additional period. Total monitoring period was one calendar year.Performance of the three system configurations was then analyzed as if each had been operating for the entire 12 calendar months, in each case using the actual temperatures and amounts of hot water consumed as observed each day. Energy consumption, overall delivered efficiency, and energy savings for each configuration were thus computed on a 12 calendar month basis and the results presented here.Units: Dual