空调系统风机盘管换热模型修正方法
Modification method of heat transfer model for fan-coil units in air conditioning systems
摘要：
利用设备厂家提供的风机盘管样本性能测试数据，建立了风机盘管换热模型，包括传热系数模型、全热交换效率模型、通用热交换效率模型。对换热模型进行了验证，提出了模型的修正关联式并对修正前后的模型进行了对比。结果表明：全热交换效率模型误差主要源于风机盘管换热过程中的纯逆流假设，模型修正系数主要与风量有关。模型修正前，全热交换效率模型误差为8.9%~21.8%，全热模型计算值误差为12.0%~22.0%，显热误差为8.3%~12.6%，出水温度误差为5.0%~8.5%，出风温度误差为6.6%~10.8%；模型修正后，模型精度及模型预测精度均得到了大幅提升，全热交换效率模型误差小于3.3%，全热模型计算值误差小于7.1%，显热误差小于2.9%，出水温度误差小于3.3%，出风温度误差小于2.5%。风机盘管换热模型简化了需求参数并显著提高了模型精度，可用于风机盘管性能评估与系统优化控制。
Abstract：
Based on the performance test data of fan-coil unit samples provided by the equipment manufacturers, the heat transfer model of the fan-coil unit is established, including the heat transfer coefficient model, total heat exchange efficiency model and general heat exchange efficiency model. The heat transfer model is verified, the modified correlation of the model is put forward, and the modified and unmodified models are compared. The results show that the error of the total heat exchange efficiency model is mainly due to the pure countercurrent assumption in the fan-coil units heat transfer process, and the models correction coefficient is mainly related to the air volume. Before the correction of the model, the model error of total heat exchange efficiency is 8.9% to 21.8%, the error of calculated value of total heat model is 12.0% to 22.0%, the error of sensible heat is 8.3% to 12.6%, the error of outlet water temperature is 5.0% to 8.5%, and the error of outlet air temperature is 6.6% to 10.8%. After the modification of the model, the model accuracy and prediction accuracy have been greatly improved, the model error of total heat exchange efficiency is less than 3.3%, the error of total heat model calculation is less than 7.1%, the sensible heat error is less than 2.9%, the outlet water temperature error is less than 3.3%, and the outlet air temperature error is less than 2.5%. The fan-coil heat transfer model simplifies the demand parameters and significantly improves the model accuracy, and can be used for fan-coil performance evaluation and system optimization control.
Keywords:airconditioningsystem;fan-coilunit;heattransfermodel;heattransfercoefficient;heattransferefficiency;totalheatexchangeefficiency;modelmodification