测试室动态热工系统模糊控制仿真研究

本文首先建立了测试室动态热工系统的仿真模型，然后分析了变水量和变风量调节方式下该模型动态响应特性；最后，针对ＦＦＳＩ和ＣＲＩ模糊控制方法，进行了测试室动态热工系统模糊控制的仿真研究。结果表明，调节方式不同，测试室系统动态响应特性也不同，且ＦＦＳＩ法较ＣＲＩ法的控制仿真效果好。

采用一次回风空调系统的热力参数计算机模拟和节能分析研究

针对一个空调房间为研究对象,利用热动力特性建立动态数学模型,求解得到空调房间采用一次回风后瞬态热力学参数变化关系,并比较房间内在无内热源、有恒定内热源、变内热源和一次回风有、无能量损失的状况下温度随时间的变化规律。结果表明,空调房间设有一次性回风系统,室内温度比无回风时更容易达到平稳状态,回风量越大,达到平稳状态所需的时间越短,从而达到节能的目的。研究结果为进一步实现空调房间的空调系统风量自动调节和建筑节能研究提供了前提和依据。

机舱进风围阱阻力特性数值分析及结构优化

机舱进风围阱的阻力直接影响电动通风机的工作性能,对机舱通风效果有重要影响。建立进风围阱流场离散模型,利用计算流体力学(CFD)软件FLUENT求解描述进风围阱气流场的Navier-Stokes方程组,并对机舱新风进风围阱的实际结构及其优化结构进行了阻力特性计算。结果表明:在对船体结构进行各种合理优化后,其通风阻力特性都得到了不同程度的改善。通过综合评估,最终选择了性价比最高的优化方案,优化后进风围阱的阻力降低了32.73%。

Finite time thermodynamic analysis and optimization of water cooled multi-spilit heat pipe system(MSHPS)

This study focuses on the heat transfer characteristics of the evaporation terminal,the cool distribute unit(CDU)and refrigerant flow distribution of a water cooled multi-spilit heat pipe system(MSHPS)used in data center.The finite time thermodynamic analysis,the exergy method and the software SIMULINK was employed to build the simulation model of the combined system.The results show that the IT servers should concentrate on arranging at the location below 1.3 m.The CDU has a heat transfer of about 74 J in a period of 6 s.And the optimum flow rate of the CDU is 0.82 kg/s.The flow distribution characteristic of a CDU which connect 2 heat pipe evaporator terminals of 6 kW was calculated,and the working fluid is R22.Then the free cooling time,part time free cooling and energy saving potential in major cities of China were analysised.The energy saving potential is from 61%to 25%.The results are of great significance for the operational control and practical application of a MSHPS and other pipe-net systems.