进行了实验室和现场试验，以提供热水管道系统热损失的数据。该研究（ASHRAE研究项目696）的目的是进行现场试验，以确定各种管道系统中的热损失。然而，管道系统不一定定义热损失，以便适用于其他管道系统。因此，开发了一个数值模型来模拟热损失，这是一种比现场试验更通用、更有用的方法。实验室和现场试验结果部分用于与配水管道系统热损失（或热增益）数值模型的模拟结果进行比较。实验包括在一定流速、进水和环境温度范围内使用非绝缘和绝缘管道的情况。 住宅和商业安装现场试验获得的数据包括水流量和水入口和出口温度。本文对实验室和现场数据进行了分析，并对实验误差和不确定度进行了估计。讨论了用于估算隔热或非隔热热水管道热损失（或热增益）的数值模型。该模型计算水、管壁和任何隔热层中的二维温度分布，作为时间的函数，并能够模拟稳定流动或无流动（备用）条件。可以在相对较短的时间跨度内指定稳定流动条件，以便几乎可以对任何拉伸计划进行建模。由于能够对一系列参数进行建模，该模型可用于对比研究，例如确定绝缘和非绝缘管道之间的热损失差异，以及配套论文。 单位:双引文:ASHRAE交易，第105卷，第。1

Laboratory and field experiments were performed to provide data on heat losses from hot water piping systems. The objective of the research (ASHRAE Research Project 696) was to perform field experiments to determine heat loss in various piping systems. The piping systems, though, did not necessarily define the heat loss so as to be applicable to other systems of piping. Therefore, a numerical model was developed to simulate the heat loss, which is a more general and useful approach than field experiments. The laboratory and field experimental results were used, in part, as a comparison to the simulation results of a numerical model of heat loss (or gain) to water distribution piping systems. Experiments included the cases of noninsulated and insulated tubing over a range of flow rates and inlet water and ambient temperatures. Data obtained for both the residential and commercial installation field experiments consisted of water flow rates and water inlet and outlet temperatures. Analyses of the laboratory and field data are included in this paper along with an estimate of experimental error and uncertainty. The numerical model developed for estimating the heat loss (or heat gain) from insulated or noninsulated hot water pipes is discussed. The model calculates the two-dimensional temperature distribution in the water, pipe walls, and any insulation as a function of time and is capable of modeling steady flow or no flow (standby) conditions. The steady flow condition can be specified over a relatively short time span so that almost any draw schedule can be modeled. With the ability to model a range of parameters, the model can be used for comparative studies, such as establishing the heat loss differences between insulated and noninsulated piping, and for a companion paper.Units: Dual