本文介绍的计算机程序的目的是为了模拟，而不是为了设备选择。模拟预测系统中所有关键位置的压力、水流量、能量流量和水温。另一方面，在选择设备时，压力、温度和流速分配在所有关键位置。然后可以选择各个部件，使其符合指定的变量组合，例如，选择一台泵，以在指定流量下提供规定的压力升高。模拟程序需要所有部件（压力）的性能特征作为输入数据- 泵的流量关系、管道和配件的压降特性、盘管的传热特性等），模拟程序计算系统的性能，以满足所有这些单独的特性。尽管模拟程序不同于设备选择程序，但通过重复应用程序，可将模拟程序用作正在探索的系统上各种热负荷组合的设计工具。本文是由技术委员会6.1“蒸汽和热水”监督的ASHRAE研究项目141的进度报告。引文:德克萨斯州达拉斯ASHRAE交易会第82卷第1部分研讨会

The objective of the computer program presented in this paper is forsimuation, not forequipment selection. A simulation predicts pressures, water flow rates, energy flow rates, and water temperatures at all critical locations in the system. In selecting equipment, on the other hand, the pressures, temperatures, and flow rates are assigned at all critical locations. The individual components can then be selected to abide by the designated combinations of variables, e.g., a pump selected to provide the stipulated elevation in pressure at the designated flow rate. A simulation program requires as input data the performance characteristics of all components (pressure-flow relationships of pumps, pressure-drop characteristics of pipes and fittings, heat transfer characteristics of coilS, etc.), and the simulation program computes how the system performs in order to satisfy all of these individual characteristics. Although a simulation program is different from an equipment selection program, the simulation program can be used as a design tool by repeated application of the program for various thermal load combinations on the system being explored.This paper represents a progress report of ASHRAE Research Project 141 monitored by Technical Committee 6.1, Steam and Hot Water.