冷凝排风热回收新风一体机的性能优化

Performance optimization of the exhaust air-condensation fresh air handling unit

为优化冷凝排风热回收新风一体机的运行性能,建立冷凝排风热回收新风一体机的Simulink系统仿真模型和Simulink-M文件寻优模型,采用试验与仿真相结合的方法对机组进行变环境工况性能研究,得到机组在不同的环境温度条件下的最佳性能系数及其对应的最佳旁通新风量。结果表明:在制冷标准工况、变旁通新风量条件下,机组性能参数的仿真值和试验值的变化趋势保持一致,且最大偏差在±7.00%以内,仿真模型可以正确反应机组在运行过程中的性能变化;在机组变环境工况条件下,机组的运行性能同时受到旁通新风的温度和风量的影响;使用Simulink-M寻优模型计算可得到不同环境温度下的最佳旁通新风量的具体值,最佳旁通新风量值随环境温度的升高先增大后减小,机组使用变频风机可以达到节能的效果。研究结果为提高冷凝排风热回收新风一体机制冷工况的运行性能提供参考。

In order to optimize the performance of the exhaust air-condensation fresh air handling unit,the Simulink system simulation model and the Simulink-M file optimization model of the exhaust air-condensation fresh air handling unit were established in this paper to study the performance of the unit under variable environmental conditions by combining experiments and simulation.Finally,the optimal performance coefficient and the corresponding optimal bypass fresh air volume of the unit under different ambient temperature conditions were obtained.The results show that the change trend of the simulation value and the test value of the unit’s performance parameters is consistent,and the maximum deviation is controlled within±7.00%under the conditions of refrigeration standard condition and variable bypass fresh air.The simulation model can correctly reflect the performance changes of the unit during the operation.The operation performance of the unit is affected by the temperature and air volume of the bypass fresh air under variable environmental conditions.The Simulink-M file optimization model can obtain the specific value of the optimal bypass air volume under different ambient temperature.As the ambient temperature increases,the optimal bypass fresh air volume increases first and then decreases.With the use of variable frequency fans,the unit can achieve the effect of energy saving.The conclusions of this paper could be considered as the useful reference for improving the operation performance of the unit.