家用热水（DHW）再循环系统的目的是减少在需要时等待在可接受温度下供水的时间，并减少随后的用水量。本文详细的研究考虑了是否有必要按照一般惯例连续运行这些再循环泵，或者是否有可能通过使用某种类型的控制策略来运行这些泵来降低DHW系统的能耗。通过详细监测，评估了三种不同的控制策略。不同的运行模式为:（a）基本工况（连续运行），（b）夜间停机，（c）高峰时段早晚停机，以及（d）通过设置为110°F（61°c）的回流管恒水器循环。为了完成这项研究，六个站点都在DHW回流管线上安装了一个aquastat，并在泵上连接了一个可编程时钟。 该分析确定了在春季、夏季、秋季和冬季的四轮循环中，每种策略的相对能量使用情况，每轮循环为期两周。与基本情况（泵每天24小时运行）相比，策略B每年平均节省6%，策略C节省6%，策略D每年节省建筑DHW能源需求中DHW部分的11%。这一点非常重要，因为对于策略D来说，这意味着建筑每年总燃料费用的4%可以节省。所有评估的控制策略都很简单，并且使用了低成本设备（安装成本低于250美元），这将有助于实现推荐控制策略的极高实施率。租户水质调查问卷显示，无论采用何种系统控制策略，满意度始终可以接受。 单元:双引文:研讨会，ASHRAE交易，第105卷，第。1.

The purpose of a domestic hot water (DHW) recirculation system is to decrease the time spent waiting for the water to be delivered at acceptable temperatures when called for and also decrease the subsequent water consumption. The research detailed in this paper considered whether it is necessary to continuously run these recirculation pumps, as is general practice, or whether it is possible to reduce DHW system energy consumption by operating these pumps with some type of control strategy. Three different control strategies were evaluated by employing detailed monitoring. The different operating modes were: (a) base case (continuous operation), (b) shutdown during the overnight period, (c) shutdown during the peak morning and evening periods, and (d) cycling by a return line aquastat set at 110°F (61°C). In order to accomplish the research, six sites each had an aquastat installed onto the DHW return line and a programmable timeclock wired into the pump. The analysis identifies the relative energy use for each of the strategies during four round-robin rounds of two weeks each during the spring, summer, fall, and winter periods. When compared to the base case, (pump running 24 hours per day), Strategy B saves an average of 6%, Strategy C saves 6%, and Strategy D saves 11% of the DHW portion of a building's DHW energy requirements annually. This is significant in that for Strategy D, this translates into a savings of 4% of the building's total annual fuel bill. All of the control strategies evaluated were simple and employed low-cost devices (under $250 installed), which should help in achieving an extremely large implementation rate for the control strategy recommended. Tenant water quality survey questionnaires show that there was always an acceptable level of satisfaction, regardless of system control strategy.Units: Dual