The result shows that the velocity and temperature fields of the original and optimized designs are both acceptable . however , the sensible load of the optimized designs may reduce by 16 . 7 % for the increase of 2 of the temperature of the supply air 结果表明，两个方案的温度场以及速度场都符合要求，但是由于改进方案提高了送风温度，至少可以节约16 . 7的显冷量，因此本文推荐采用改进方案。
For a single zone being served by an air loop , the inlet to its air distribution unit and the zone outlet can be the zone equipment inlet and outlet nodes directly , thus eliminating the need to specify a zone supply air path and a zone return air path 对于由一个空气环路控制的单个区域，其空气分布系统的进口和区域出口能够直接作为区域设备的进口和出口节点，从而消除了指定区域送风路径和回风路径的需求。
Analysis result of simulation shows : underground commercial streets and atrium can use natural filling . in the actual engineering , mechanical smoke exhaust system is used by the local fire department added . the night club uses a set of mechanical smoke exhaust system , and the quantity of supply air can ’ t be less than 50 percent of the exhaust 模拟研究表明:地下商业街和中庭可以采用自然填充,在实际工程中当地消防部门在中庭增设机械排烟系统,以加快热烟气的排放;夜总会采用机械排烟,补风量不应小于排烟量的50 % 。
Genetic algorithm is used to optimize the parameters of pid controller that is used to control the plant lon ( local operating network ) is designed to control vav air - conditioning system . by this means the static pressure control and minimum total supply air volume control are experimented . the paper analyzes the coupling among loops , the whole system ' s stability and energy saving effect under the two control methods 针对目前变风量空调系统的模型都是用机理建模方法建立的情况，本论文用最小二乘法对机组部分进行系统辨识，建立了水阀?送风温度、变频风机?静压两个回路的模型，经验证比较接近实际系统；采用遗传算法对pid控制器的参数进行寻优，寻优结果令人满意；设计了变风量空调系统的lon控制网络，以此为实现手段，进行了定静压控制和最小总送风量控制，并在两种控制方式下，分析了各个回路的耦合情况、两种控制方式的稳定性和节能效果。
The experiment ' s results show that the system is stable under the static pressure control and energy saving under the minimum total supply air volume control . although the terminal dampers ' s tuning time is prolonged under the minimum total supply air volume control , it can be reduced by adopting the appropriate sampling time when debugging the system . from all of this we can conclude thart the minimum total supply air volume control has a good application perspective 实验结果表明，定静压控制方式下系统较为稳定，最小总送风量控制比定静压更加节能，但它延长了末端阀位的调节时间，在系统调试时，我们可通过选择合适的采样时间来缩短阀门的调节过程，所以最小总送风量控制具有广阔的应用前景。
In this paper , using phoenics software to compute and analyze the variety rule of the convecting transfer heat at the basis of computing and analyzing the temperature and velocity field of one underfloor supply air room with a focus hot source , and concluding that the number of the hot source and the supply air outlet > the intensity of the hot source and the volume of supply air will influence convecting transfer heat , and obtained its correlativity formula 本文针对一下部有集中热源的地板送风空调小室，利用phoenics软件，在计算分析小室内气流的速度场及温度场的基础上，对对流热转移量的变化规律做了计算分析，最后得出对于下送风小室的对流热转移量与热源的个数、送风口个数、热源强度、送风量等因素有关，并且得出了其相关关系式。
Through the research work of this article , it is shown that cfd technology can efficeintly instruct the design of indoor air distribution and evaluate indoor air quality and ventilating effect ; the distribution of heat sources have great impact on indoor air distribution ; under variable air volume condition , the indoor temperature and velocity fields are quite even and the thermo - environment is relatively good when using diffusers with coanda effect such as square diffuser and slot diffuser to supply air 经过本文研究发现，利用cfd技术可以有效地对空调室内气流组织设计进行指导，全面对室内空气品质和通风效果进行评价。热源分布对于空调室内的气流组织具有极其重大的影响。在变风量条件下，利用具有良好贴附效应的送风口如方型散流器和条缝风口送风，空调室内的温度场和速度场较均匀，室内的热环境良好。
At the beginning of this article , we give the analysis about the principle of external condensation . we find out that the most important factor in the condensation is the temperature of the air in the system . and we point out the factors which can make influence in the external condensation , such as the temperature and the humidity of the environment , the temperature and the pressure of the supplying air , the load of the system , the area of passage of speed control valve , and so on . next , we give the mathematics model of the pneumatic system using the knowledge of aerodynamics and heat transfer theory . and using the finite difference method and the numerical analysis we can get the solutions of the model . we use c program to simulate the model 本文首先对气动系统外部结露的原理进行了分析,指出了气动系统内部气体温度下降是气动系统外部结露根本原因,提出了影响气动外部结露的主要因素,包括环境温度、环境湿度、供气压力、供气温度、气缸负载和调速阀开度等。然后应用气体动力学、气体热力学和传热学对气动系统建立数学模型,用逆步进有限差分法和数值分析算法对所建模型进行求解,利用c语言编制程序对气动系统模型进行仿真,给出了气管及气缸内气体的各个时刻的状态参数。
In this paper , the standard three - dimensional k - two - equation turbulence model which modifies the item of buoyant effect and simple algorithm are adopted , wall functions are used to deal with the boundary condition and a simplified method - box method is used to model the supply air boundary condition 本文数值计算采用经过浮升力项修正的k -两方程模型和simple算法，壁面边界条件采用标准壁面函数，风口边界条件采用盒子方法。厂房内的气流运动主要受风口出流动量的制约，因此选择合理描述入流边界条件的风口模型对数值模拟至关重要。
The total area of the corporation covers about 200 chinese acres and the length of coastline is about 1 , 140 meters , the auxiliary facilities have taken shape the main facility and the equipment include the 30 , 000 dwt dry dock which is 192 meters long by 40 meters wide the gate width 32 meters and 10 meters deep , is to date the biggest dry dock in fujian province ; one fitting wharf length 65 meters , width 17 meters ; 16 tons portal crane 1 set , 16 tons gantry crane 1 set , mobile cranes 50t1 25t1 12t2 8t4 and other necessary transportation , coatings , the precision work equipment supplying air 120 m min , spraying grit more than 4 , 000 m day , renews the steel plate 12 15 t day we can finish repairing all kinds of ships under 40 , 000 dwt within 7 to 10 days our corporation obtains the first - class dockyard to repair and build steel - made ships lisence in 2001 , passed the national environmental protection appraisal in august 2002 , was designated shipbuilding in fujian for maintaining foreign ships in octobet 2002 , the dry dock , passage channel , the turning area , fitting wharf are passed by passage safety appraisal in march , 2003 主要设施和设备有： 3万吨级干船坞一座长192米宽40米坞门净宽32米深10米是福建省目前最大的干船坞舾装码头一座长65米宽17米16吨门座起重机1台10吨门吊1台汽车吊8台50吨1台25吨1台12吨2台8吨4台以及与其相配套的运输喷涂精加工设备。每分种供气120立方米，日喷砂面积4000多平方米，日换钢板15 20吨。一般修船工期为7 10天。
