变风量空调系统新风量控制方法试验研究

发布时间：2018-05-11 20:22

本文选题：变风量空调系统 + 新风量控制　；参考：《大连理工大学》2013年硕士论文

【摘要】：在变风量空调系统中,送风量随着负荷的变化而变化,送风量的变化会引起新风量偏离设定值；新风量不足将导致室内空气品质变差,反之,新风量过量则引起处理新风的能耗增加；因此,如何控制新风量对保证室内空气品质和降低新风能耗十分重要。为了得到有效的新风量控制方法,本文首先搭建了一个小型的变风量空调系统的试验台,包括硬件系统和自动控制系统；通过控制软件建立了变风量空调系统图形化控制界面,编写了各个控制回路的控制程序并下载到控制器,从而实现整个系统的自动控制；对试验台进行运行调试,以便确定控制回路的最优控制参数,最终使系统稳定的运行。其次,本文对新风量压差控制方法的原理以及实现方法进行了详细的论述,并在分析了该方法不足的基础上,提出两种改进的控制方法：改进方法一是对压差取点位置进行了优化,以新风段静压代替新风阀压差来控制新风量,即新风段静压控制方法；改进方法二是对风阀的控制策略进行优化,使得新风段和回风段阻力最小,即基于新风阀和回风阀分时段调节的控制方法。最后,为了检验压差控制法以及改进方法是否满足控制要求,本文根据试验台的具体情况设计了对比试验工况,通过试验得到上述控制方法对新风量的实际控制效果。试验结果表明,改进方法一比压差控制法的新风量控制效果略好,同时新风段静压差值比新风阀压差值更大便于测量；改进方法二比压差控制法的新风量控制效果较好,同时送风机的瞬时功率得到降低,即具有较好的节能性。
[Abstract]:In variable air volume air conditioning system, the volume of air supply varies with the change of the load. The change of air supply will cause the deviation of the new wind quantity from the set value. The shortage of fresh air will result in the deterioration of indoor air quality. On the contrary, the excess air volume increases the energy consumption of the new wind. Therefore, how to control the new air quantity to ensure the indoor air quality and reduce the new air quality is new. Wind energy consumption is very important.
In order to get an effective new wind control method, this paper first set up a small air conditioning system test bed, including hardware and automatic control system. Through the control software, the graphical control interface of VAV air conditioning system is set up, and the control program of each control circuit is written and downloaded to the controller. Now the whole system is controlled automatically, and the test bench is run and debugged so as to determine the optimal control parameters of the control loop, and ultimately make the system run stably.
Secondly, the principle and the realization method of the new air pressure difference control method are discussed in detail. On the basis of the analysis of the shortage of the method, two improved control methods are put forward: one is to optimize the position of the pressure difference, and take the new wind section static pressure instead of the pressure difference of the new wind valve to control the new wind, that is, the new wind section. The static pressure control method; the improvement method two is to optimize the control strategy of the wind valve, which makes the resistance of the new wind section and the return air section minimum, that is, the control method based on the time interval adjustment of the new wind valve and the return valve.
Finally, in order to test the pressure difference control method and whether the improved method meets the control requirements, this paper designs the comparison test conditions according to the specific conditions of the test rig, and obtains the actual control effect of the above control method on the new air volume by the test. The experimental results show that the improved method is slightly better than the new wind control method of the method of pressure difference control. The static pressure difference of the new wind section is more convenient than the pressure difference of the new wind valve. The improved method two is better than the pressure difference control method, and the instantaneous power of the fan is reduced, that is, it has better energy saving.

【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831.3

【参考文献】