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基于已有的直流变频变风量恒温恒湿空调机组,针对地下建筑常年湿度较大的情况,提出一种变频变风量结合主、副电子膨胀阀的多变量控制策略,并通过LabVIEW软件实现编程控制。为验证控制方法的可行性,采用模拟负荷发生器在实验室中模拟地下空间的实验热湿环境特征,根据机组处理的热湿能力选取不同热湿负荷工况下进行实验室温湿度控制实验。实验结果表明,在此控制方法下该恒温恒湿机组能满足实验工况下的地下空间热湿的控制要求,在两组总负荷不同的情况下,干球温度和相对湿度都能稳定在设定值附近,系统的控制精度和稳定性良好。
Based on the existing DC inverter air volume constant temperature and humidity air conditioning unit, aiming at the situation that the underground building has high annual humidity, a multivariable control strategy based on variable frequency and variable air volume combined with main and auxiliary electronic expansion valves is proposed and controlled by LabVIEW software . In order to verify the feasibility of the control method, the simulation load generator was used to simulate the experimental hot and humid environment characteristics of the underground space in the laboratory, and the laboratory temperature and humidity control experiment was conducted under different heat and moisture load conditions according to the heat and wet capacity of the unit. The experimental results show that under the control method, the constant temperature and humidity unit can meet the control requirements of underground space heat and moisture under experimental conditions. Under different total load, the dry bulb temperature and relative humidity can be stabilized Near the set value, the system’s control accuracy and stability are good.