使用数字控制策略，对校准量热计室的标准装置的冷却能力进行最终控制，使其达到1/2%以内。系统初始化或启动时有两个控制回路。一个回路使用迭代技术设置阀门的位置，以获得所需的流量。第二个回路调节风门，以确保室内空气流动正常。使用两个温度等效流动路径中的流速和热量之比，可以精确测量装置上的负载。主控制回路用于精确测量负载。在该回路中，对小型控制加热器的功率进行调整，以在两股气流之间提供零温差。小控制加热器的功率比和两个流速将使负载从腔室中移除。控制系统在一系列负载值范围内是灵活的。控制程序和系统设计为用户友好且易于操作。 该系统的使用要求是程序中描述的简单电气和流体连接。制冷机启动后，用户仅与控制程序进行交互。阀门、变阻器、变量和阻尼器等设备由计算机进行电气控制。计算机在屏幕上连续显示温度、流速、功率读数和冷负荷值。该系统还包括用于以后打印或绘图的数据采集。单位:双引文:阿什雷交易，1986年，第92卷，第。1A，旧金山

Final control of the cooling capacity of a standard device for calibrating calorimeter rooms is test attained within l/2% using a digital control strategy. There are two control loops in the initialization or start up of the system. One loop sets the position of the valves to get required flow rate using an iteration technique. The second loop adjusts the damper for proper air flow in the chamber.Accurate measurements of the load on the device is attained using a ratio of flow rates and heat in two temperature equivalent flow paths. A main control loop is used to get an accurate measure of the load. In this loop the power to a small control heater is adjusted to provide a zero temperature difference between two flow streams. A ratio of the power to the small control heater and the two flow rates will give the load removed from the chamber. The control system is flexible over a range of load values.The control program and system are designed to be user friendly and easy to operate. Requirements for the use of the system are simple electrical and fluid connections described in the program. Following the start of the chiller the user interacts only with the control program. Devices such as valves, rheostats, variacs, and dampers are electrically controlled by the computer. The computer gives a continuous display of temperatures, flow rates, power readings, and cooling load values on the screen. The system also includes data acquisition for later printing or plotting.Units: Dual