基于冷量阈值的整流罩空调控制策略研究

A Study on Control Strategy for Air Conditioning of Satellite Fairing Based on Cold Energy Threshold

摘要:

针对某航天发射场整流罩空调机组经常出现前级蒸发器结霜和送风温湿度波动问题,进行问题机理分析,结合新风与表冷后目标露点的焓值差提出了一种基于冷量阈值的压缩机PID控制方法;该方法首先根据新风和目标露点的焓值差计算出处理空气所需的实际冷量,然后将该冷量作为基于露点PID控制压缩机输出的上限值;冷量阈值的使用一方面使PID控制一直保持欠调节状态,避免了压缩机投入比的上下跳变而导致送风温湿度波动的问题；另一方面有效解决了压缩机投入冷量过多而导致的蒸发器结霜问题;实践证明,优化后的空调机组运行稳定可靠,温湿度控制精度得到有效提升,分别达到了±0.5 ℃和±3%,满足航天器产品保障需求。

Abstract:

In order to solve the fin evaporator frosting and temperature and humidity fluctuation of air supply problems for the air conditioning of satellite fairing in space launching site, the controlling strategy for compressor with the threshold of cold energy was proposed. This strategy calculated the cold energy that air treatment needed practical based on the enthalpy potential between outdoor air and target air firstly. And then the cold energy would be regarded as the upper limit of PID controller for compressor. The appliance of threshold of cold energy not only kept the PID controller in undershooting state, and avoided the problem of temperature and humidity fluctuation caused by the compressors input jump. In addition, it avoided the compressor inputting cold energy overabundance and solved the fin evaporator frosting problem effectively. The experiments show that the improved air conditioning running stably, and its accuracy of temperature and humidity achieved ±0.5 ℃ and ±3% respectively, and meeting design and application requirement.