排气温度控制系统（DATCS）是带有闭环反馈控制系统的加热装置。典型系统的示意图如图1所示。加热装置是一个蛇形管翅式热交换器，由锅炉提供热水。空气温度通过改变水流量来控制，而热交换器的进水温度保持不变。对DATCS的要求各不相同，从冬季的全热负荷到春季和秋季的部分热负荷。 在DATCS的设计中，热交换器和热水锅炉的尺寸和选择主要是为了提供全热负荷所需的热量，。反馈控制回路的设计通常是为了在冬季提供可接受的DATC性能。这意味着反馈回路设计用于在大约75%至100%满载下运行时控制DATC。当需要低于75%的完全加热时，该设计程序会造成DATCS性能不佳的潜在问题。 本文的目的是:通过计算机模拟，探索典型的DATCS在各种负载下的性能特征。如果存在不良性能，确定DATCS中的哪些部件应负责，并在承受部分负载时推荐可能的方法，以获得良好的DATCS性能。引文:加利福尼亚州洛杉矶ASHRAE Transactions第80卷第1部分

A discharge air temperature control system (DATCS) is a heating unit with a closed loop feedback control system. A schematic drawing of a typical system is shown in Fig. 1. The heating unit is a serpentine tube and fin heat exchanger supplied with hot water from a boiler. The air temperature is controlled by varying the water flow rate while the temperature of the inlet water to the heat exchanger remains constant.The requirements placed on a DATCS vary from full heatlng load in the winter to part heating load in the spring and fall. In the design of a DATCS the heat exchanger and hot water boiler are sized and selected primarily to provide the heat required by the full heating load,. The feedback control loop is designed generally to give acceptable performance of the DATCS during the winter months. This implies that the feedback loop is designed to control the DATCS when it is operating under approximately 75% to 100% of full load. This design procedure poses a potential problem of poor DATCS performance when demands for less than 75% full heating occur.The purposes of this paper are:To explore via computer simulation the performance characteristics of a typical DATCS under various loads.If poor perforance exists, to determine whieh components in the DATCS are responsible,To recommend possible methods for good DATCS performance when experiencing a part load.