在中央冷冻水系统中，制冷机组通常集中在一个位置，冷却水通过管道分配到多个单独的建筑物，每个建筑物可能包括多个单独的冷却盘管。除了中央冷却装置外，可能还有一台或多台远程冷水机，这些冷水机在设施转换为中央装置时就已经存在。现场系统通常包括一次泵和二次泵以及各种类型的空气和水- 控制阀和压力控制装置。本文所述方法的计算机程序旨在模拟系统，而不是直接用于选择设备。在设备选择中，设计师可以指定关键位置的压力、温度和流速值，并选择符合这些规范的管道尺寸、泵、盘管和阀门。例如，可以选择一台泵，在指定的水流量下提供规定的压力高程。另一方面，模拟假设定义了流动网络，选择了所有组件，并且所有组件的性能特征已知。 然后，模拟程序计算在非设计热负荷下离开冷却盘管的水的压力、温度和流速，以及空气的温度。该计划特别适合几种情况。一个申请:ASHRAE交易，第83卷，第2部分，哈利法克斯，北卡罗来纳州

In central chilled water systems, the refrigerating units are usually concentrated at one location where they chill water that is distributed through pipes to a number of individual buildings, each of which may include a number of individual cooling coils. In addition to the central chilling plant, there may be one or more water chillers remotely located that were in existence when the facility was converted to a central plant. Field systems often include primary and secondary pumps and various types of air- and water-control valves and pressure control devices.The computer program whose methodology is described in this paper is intended for simulating the system and not directly for selecting equipment. In equipment selection, the designer can assign values of pressures, temperatures, and flow rates at critical locations and select the pipe sizes, pumps, coils, and valves that correspond to those specifications. For example, a pump can be selected to provide the stipulated elevation in pressure at the designated water flow rate. A simulation, on the other hand, assumes that the flow network is defined, that all components are selected, and that the performance characteristics of all components are known. The simulation program then computes the pressures, temperatures, and flow rates of water as well as temperatures of air leaving the cooling coils at other than design thermal loads. There are several situations for which the program is especially suited. One applicat