声明称，超过40个单元的多户建筑通常在生活热水系统上有一个泵，该泵通过管道回路不断循环热水。这样的系统可以确保热水的连续输送，但高管道损耗会降低整体效率。描述了如何在低需求期间研究降低系统温度的策略，在三栋公寓楼中安装了基于时间和基于需求的温度控制。目的是评估节约潜力、运营和租户接受度。试验采用交替模式设计，由计算机数据采集系统监控。说明这种控制策略是值得的，即使在相对较小的建筑中，这种控制策略也是值得的。在时间控制和时间控制方面，平均节能10.3%的家庭热水供暖。 2%用于需求控制，简单回收期分别为2.2年和1.9年。需求控制更容易操作，似乎不太可能被推翻。关键词:公寓，美国，控制，家用，热水供应，控制，温度，实验，节能，测试引用:ASHRAE Trans。1992年，第98卷，第1部分，论文编号AN-92-2-3，676-689，图4，表7，参考文献。

States that multifamily buildings larger than 40 units commonly have a pump on the domestic hot water system that constantly circulates heated water through a piping loop. Such a system ensures continuous delivery of hot water, but high piping losses decrease overall efficiency. Describes how, to investigate the strategy of reducing system temperatures during periods of low demand, time-based and demand-based temperature controls were installed in three apartment buildings. The purpose was to assess savings potential, operation and tenant acceptability. Tests were conducted using an alternating mode design monitored by a computerised data acquisition system. States that this control strategy is worthwhile even in a relatively small building, this control strategy is worthwhile. Energy savings averaged 10.3% of domestic hot water heating for the time control and 16.2% for the demand control, with simply paybacks of 2.2 and 1.9 years respectively. The demand control was easier to operate and appears less likely to be overridden.KEYWORDS: Flats, USA, controls, domestic, hot water supply, controls, temperature, experiment, energy conservation, testing