The relation between thermal environment parameters for instance air temperature , relative humidity , air velocity and thermal sensation or thermal comfort has been studied in all environments . the differences of thermal sensation or thermal comfort in this environments and pmv - ppd are researched too 并分析了在实际空调环境下、自然通风环境下和实验空调环境下空气温度、湿度、空气流速、环境辐射温度等参数对人体热感觉和人体热舒适的影响;并将人体热感觉和人体热舒适与pmv - ppd指标进行了比较分析。
The results show that : the lose of pressure is small when air velocity and the longth of honeycomb potter heat storage bed are varied ; but the switch time of air and the bulk of storage bed play important roles as regard its dynamic thermal performance 结果表明：蜂窝型陶瓷蓄热体换热器的压力损失随着空气流速以及蓄热体长度的不同而变化，但总体上说，其压力损失并不大；四通换向阀的换向周期和蜂窝陶瓷蓄热体换热器的体积等是影响其温度效率和热回收率等热性能的重要因素。
As we all know , occupants " thermal sense is mainly dependent on the six factors : inside air temperature , humidity , air velocity , mean radiant temperature , clothing and metabolism rate . the traditional hvac control system , neglecting other factors concerned with human comfort , only considering the inside air temperature and air humidity and indirectly impacting on occupants by the two parameters control , cannot satisfy the comfort requirement of occupants and is energy wasting as well 传统的空调控制系统以室内空气的温湿度作为控制对象，而实际上影响人体热舒适的因素不仅包括温度与湿度，还有风速、平均辐射温度、人体的衣着热阻和人体的新陈代谢率，人体对环境的冷热感受是这些因素综合作用的结果，因此在很多时候系统并不能满足人体对热舒适的需要而且节能性较差。
When in experiment , the air was heated by the film heater installed on the above and below surface of channel , adopting various air velocity of flow , test import ' s and export ' s temperature , wall temperature , fluid flux and the drop of pressure , and the other parameter . adopting nu and nu0 to analyze the baffle ' s situation of heat transfer and fluid flow , which baffle was holed various diameters 实验时，通过矩形通道上下壁面敷设的电加热膜加热通道空气，改变空气流速，测试不同工况时的进出口温度、壁面温度、流体流量和压力损失等参数，并采用无量纲努谢尔特准则数nu 、 nu _ 0等分析了设置不同开孔折流板的换热与流动情况。
Longradar offer approximate ten thousand of products of pressure , vacuum , flow , air velocity , temperature , humidity , level and valves , which are commonly applied in the fields of industrial automation , hvac , building autoimmunization control , electric power , petroleum , chemical industry , boilers , water treatment , compressors , freezing refrigeration , food brewage , pharmacy , light industrial , environmsent protec - tion , clean industry etc 在上游安装一个带有蛋形格栅的椭圆形流体喷嘴，可以提供一个精确构造简单的空气体积测量系统。在喷嘴的出口，空气释放时的风速分配是一致的静压为零。因此，喷嘴上游的总压力是喷嘴出的速度压力-于是就容易计算体积了。
Abstract : because the combustion monitoring method of indigenous generating units is backward ， used as the important parameters of design and guiding gombustion debugging of boilers ? ? the primary and secondary air velocities at the exits of nozzles could not so far achieve real - time and accurate measurements ， the combustion adjustment of utility boilers is in blind or semi - blind condition ， directly affecting the safe and economic operation of boilers 文摘:由于国产机组燃烧监测手段落后，作为设计和指导锅炉燃烧调整的重要参数? ?锅炉一、二次风喷口风速，一直没有能实现实时、准确的测量，电站锅炉的燃烧调整处于一种盲目、半盲目状态，直接影响锅炉的安全经济运行。
Abstract : in the internal circulating fluidized bed , there exist the moving zone , fluidizing zone and heat transferring zone with different fluidized air velocities . the convection heat transfer coefficient of immersed tube in the heat transferring zone is impacted by the velocity of the moving zone nearby and its data and change trend are obviously different with those of the common bubbling bed . the maximum heat transfer coefficient is evidently higher than that of the bubbling bed . as the bed materials have not been fluidized in the heat transfer zone , the coefficient has increased highly . the curve of that changes gently , feasilble to control the combustion intensity in the fluidizing zone 文摘:垃圾焚烧系统中，内旋流流化床存在不同布风速度的移动区、流动区和换热区，处于换热区的埋管的对流换热系数受附近流动区气流参数的影响，其变化趋势及数值大小与普通鼓泡型流化床之间有明显不同：最大的对流换热系数明显高于鼓泡床；换热区尚未流化时，对流换热系数已经大幅提高；整条换热曲线的变化比较平缓，易于流化床浓相床内换热。
The research results show that the counter - flow condensers have a better performance than that of other arrangements in single - circuit condensers , and that branch flow should be adopted in multi - rows condensers to decrease the pressure drop and increase the heat transfer capacity , and that the influence of gravity force can not be ignored , and that there must be an optimum refrigerant mass flow which can make the condenser perform best when the air velocity is constant while there must be an optimum air flow which can make the condenser perform best when the refrigerant mass flow is constant 研究结果表明，单回路冷凝器中，逆流布置换热效果最好，叉流其次，顺流最差；多排管冷凝器应尽可能采用分流方式，以减小压降，增强换热；布置冷凝器流程时，重力的影响不可忽略；当风量不变时，必然存在一最佳制冷剂流量使冷凝器性能达到最佳；当制冷剂流量保持不变时，也相应存在一个最佳风量使冷凝器性能最佳。
Then a one - dimensional unsteady incompressible flow with moving pollutant source model was proposed . the continuity equation , momentum equation and convection - diffusion equation were discredited using finite volume scheme . thus a software for predicting the air velocity and pollutant in railway double track tunnels was developed 接着，根据双线铁路隧道运营通风的特点，建立了一维不可压缩非恒定流和流动污染源的物理模型以及山相应的连续性方程、动量方程和对流扩散方程构成的数学模型；在此基础上，利用数值计算方法，编制了一套双线铁路隧道运营通风的数值计算程序。
In this system , mean velocity pipe is applied to transform the air velocity signal into pressure difference signal , and then the pressure difference signal is input into pressure difference transmitter to realize the transform of the pressure difference signal from non - electricity signal to electric current , and through the resistance in the corresponding sampling circuit the electric current is transformed into voltage signal ; the thermocouple is used as the primary element to realize the transform from temperature signal to the voltage signal ; under the control of communication agreement module , diversified voltage signal is transported into computer by way of a / d conversion module , and then the monitoring software compiled beforehand is transferred to deal with all the voltage signals relatively , the result of which is conveyed to relative interface to display 该装置具有三个特点：一是采用表面式测温方法，有效地减少了元件的维护与损耗；二是采用工业控制计算机及信息就地采集、数据总线传输的方式，充分利用计算机和数据自动采集方面的技术，实现各种参数的在线测量，监测指标全面，能与dcs系统联用，具有技术先进性和一定的前瞻性；三是采用显示器配工业触摸屏的显示方式，为现场运行人员提供了简单、易学、方便的操作模式。本装置自2001年8月投入运行以来，有效地帮助、指导运行人员进行燃烧调整，对于锅炉和机组的安全、经济运行发挥了重要作用。
