螺杆式冷水机组的故障模拟及诊断软件的研究

中央空调系统故障排除通常中凭经验判断，这会造成一定的滞后甚至差错。洁净空调类的中央空调系统发生故障时，往往会带来更大的经济损失。因此，HVAC设备与系统故障诊断技术的研究和应用，对控制修复、故障排除和故障预防都有十分重要的意义。本文针对制冷机的工作特性和螺杆冷水机组故障进行了理论分析，得出了螺杆式冷水机组常见故障的表现特征，并在自行设计的实验系统上模拟了8个螺杆式冷水机组的常见故障。通过对实验数据的分析，筛选了5个制冷机运行参数作为故障判断的特征参数，通过分析研究这几个参数的变化规律总结出故障判断准则，在此基础上，编写了一套故障诊断软件，并在该实验系统上进行了 验证，结果表明该故障诊断软件运行可靠、诊断故障准确。

Research on Fault Simulation and Diagnosis Software of Screw Chiller

The faults of central air-conditioning system are usually judged by human experience,which will cause certain lag even mistake.Once faults happen in the systems such as clean air conditioning system,economic loss is inevitable.So it's meaningful to do some research on fault detection and diagnosis of HVAC systems for equipment maintenance.The working characteristics of the refrigerating unit and the faults of the screw chiller are analyzed rationally and eight common faults of the screw chiller are simulated on the experimental platform.According to the data,five parameters are chosen as characteristic parameters for fault detection.The variation of these parameters forms the rules of fault detection.Finally,we developed application software which could properly detect certain faults based on the results.