【作者】 张莉；

【导师】 郑庆红； 连之伟；

【作者基本信息】 西安建筑科技大学 ， 供热、供燃气、通风及空调工程， 2003， 硕士

【摘要】 二十世纪八十年代以来，空调技术的发展开始对室内环境质量有了足够的重视，置换通风因其较高的通风效率和换气效率而受到人们的青睐。对于置换通风其节能性也优于其它的送风方式，即其温度效率高，而且置换通风总有部分热量处于房间上部区域，送风口设在低部，送入空气直接进入工作区，只是吸收了工作区的热、湿量，保证工作区的气象参数满足要求。对置换通风其得热量计算时只考虑工作区热源散热量及从下部墙体进入的热量，可不考虑房间上部区域的得热量。实际运行时由于空气的回返，一方面会把上部的得热带回工作区，另一方面也会把下部已传送上去的热量又带回，从而增加了下部的得热量，本文就影响对流热转移量的因素利用数值模拟的方法做了一初步的研究。 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。同时发现，回风口数目对于对流热转移量的影响很小，就本文研究的范围来看，其影响可以忽略不计。对于上部有热源的条件下，则其对流热转移量的变化关系是由热射流与送风冷射流共同作用影响的，在下部热源强度相同的条件下，存在一极限风速，在该风速以下，上部热源强度越大，则对流热转移量越小，反之在该风速以上，上部热源强度越大，则对流热移量越大。在总热源强度相同的条件下，上部热源强度越大，则对流热转移量越小。所以工程上采用地板送风时，应根据房间上下部热源强度的不同，采用不同的送风速度，从而减少对流热转移负荷，在工程上达到最大的节能。更多还原

【Abstract】 Since the 1980s, with the developing of air-condition technology, men begin thinking much of room condition quality, displacement ventilation has been given a good favour for its higher ventilation effectiveness and air exchange efficiency. Displacement ventilation also has higher energy using ration than other supply air systems, ie it has higher temperature effectiveness, and that displacement ventilation system always has part quantity of heat lying upside area of room, air supply outlet lies at low side, supply air direct come into workaround, and only absorb heat and humid of workaround, assure satisfaction of the design conditions of workaround. Only the heat gain from the heat source and the heat coming from lower part of the wall is taken into account, the heat gain of higher zone of the room isn’ t calculated. As the return of flow is being, one side the heat gain of higher zone will be lead back, on the other hand, the heat has been transmitted to upside also will return, so the heat gain will increase. The methods of using numerical simulating has been used to analyze the factors influecing convecting transfer heat in this paper.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 . At the same time, I discover that the number of the return air inlet has a little influecing and it can be neglected. When there is hot resource at upperside of the room, the hot jet and supply air jet togetheraffecting. At the same lower part heat intensity, a utmost wind speed exist, the supply air speed lower, the more heat intensity on the upside , the less convecting transfer heat, whereas. So when the underfloor air supply system is been used in engineering, different supply air speed will be adopted on the basis of different heat intensity of upside and low side of room. So to economize energy.更多还原