平均传热系数

建筑节能设计中外墙平均传热系数Km值影响因素分析

Analysis on the Factors Affecting the Mean Thermal Transmittance ( Km ) of the External Walls in the Energy-saving Buildings

其中，建筑设计中外墙平均传热系数km值的大小，对建筑物耗能量即建筑节能效果影响极大。

Specifically , the value of mean thermal transmittance ( Km ) of building external walls is an important index for the building energy consumption .

1916年，Nusselt提出了纯饱和蒸汽在垂直和水平管外冷凝时平均传热系数的理论关系式。

In 1916 Nusselt presented the theoretical relations for the mean coefficient of heat transfer for a pure saturated vapor condensing on vertical and horizontal tubes .

本文对不同保温层厚度的新型高效夹心保温复合墙体及传统夹心保温复合墙体的墙体平均传热系数进行了计算及对比分析；并利用ANSYS软件对墙体的冷桥影响进行了数值模拟分析。

This article calculated and analyzed comparatively the average heat transfer coefficient of the new type of high-performance cavity insulated composite wall and traditional wall by different thickness of insulation layer , and used ANSYS to study the impact of cold bridge to the wall by numerical simulation analysis .

冷桥对墙体平均传热系数的影响

Influence of Thermal Bridge on Determination of Mean Heat Transfer Coefficient for External Walls

客车车体稳定导热平均传热系数的研究

Study on the Average Heat Transfer Coefficient of the Railway Car Body in State of Steady Conduction

模型计算的平均传热系数可以与实验数据吻合。

The surface-averaged heat transfer coefficient calculated by this model showed good agreement with the experimental data .

计算表明，建筑物或户型的供暖指标与其平均传热系数和体形系数的乘积成正比。

The result shows that the heat loss indices are in direct proportion to the product of mean transfer coefficient and shape coefficient .

由于常规算法的局限性，在实际项目中换算外墙平均传热系数与外墙主墙体传热系数需要计算的工作量较大。

Then average heat transfer coefficient of building external wall and heat transfer coefficient of building block filling wall by calculating were calculated .

把按二维温度分布计算出的墙体平均传热系数与按标准的一维面积加权方法计算出的平均传热系数作比较，两者差别很大。

The difference between the wall mean heat transfer coefficient calculated from the simulated results and that from one dimension weighted method is evident .

本文实验研究大颗粒流化床中垂直埋管的周向平均传热系数随流化速度和截面高度的变化规律以及垂直埋管的水平位置对传热的影响。

In this paper , circumferentially averaged heat transfer coefficients around a vertical heated tube immersed in a large particle fluidized bed have been measured .

在试验条件下，这种冷凝器的平均传热系数是光滑管立式冷凝器平均传热系数的1.30倍以上。

Under the experimental condition , the average heat transfer coefficient of the condenser of double-side screwed pipe is 30 percent higher than that of the smooth pipe .

并且局部传热系数和平均传热系数均随喷淋密度，蒸发温度，管间距的增大而增大。

Experimental results indicate that the local heat transfer coefficients and average heat transfer coefficients increase with the increase of spray density , evaporation temperature and tube pitch .

介绍了计算地下温度场的分布情况、单位埋管深度换热量、平均传热系数、进出地下埋管的水温和埋管换热器面积的方法。

Presents calculating methods of earth temperature distribution , heat exchange per unit depth of circuit , average heat transfer coefficient , water temperature in inlet and outlet of buried pipes and heat exchange area .

实验中的控制因素包括液体喷淋密度、蒸发温度、管间距等，实验测得了上述参数变化对蒸发侧局部传热系数和平均传热系数的影响情况。

Results are attained about local and average heat transfer coefficients changing with the effect of spray density , evaporation temperature and tube pitch etc. The effects of those factors on the heat transfer coefficients are analysed and discussed .

结合实验系统和传热模型，我们对制冷运行中地下换热器的出水温度及周围温度场分布进行了模拟分析，并给出了钻孔的平均传热系数的公式。

Combined with experimental system , this model simulates the temperature of the water which comes from ground heat exchangers and the round temperature field . The formula about the heat exhaust coefficient of the heat exchangers is deduced in this paper .

将本文所得测试结果与其他研究者的测试结果作了比较，并将由局部传热系数求得的平均传热系数和实测的平均传热系数作了比较。结果表明，本文提出的测试方法可靠。

From the comparison between the results in this work and the other researcher 's data , and the comparison between average heat transfer coefficients calculated from local heat transfer coefficients and the measured average coefficients , it shows that the method proposed in this work is reliable .

实验表明，适当提高混合气温度和流速，冷凝传热的混合气侧的平均传热系数可保持在较高的实用水平，即1000W/m.2℃甚至更高。

These results show that reasonable increase of the mixture gas temperature and its velocity can improve the heat transfer coefficient around 1000 W / m2 ·℃ or more . At the same time , the working characteristics of condensing transfer heat process used in our experiment was also investigated ;

通过计算流体力学软件FLUENT对带盘管搅拌釜内的非稳态换热过程进行了数值模拟，得到了搅拌釜内流场、温度场和盘管内外两侧平均对流传热系数。

The unsteady heat transfer process in a stirred tank equipped with helical coils was investigated by using software FLUENT . The temperature field and the heat transfer coefficient were obtained .

基于上述建立的机舱平均对流传热系数和主流温升经验关联式，可以使发动机冷却系统1D模型脱离耦合环境独立运行，为机舱散热研究和冷却系统设备优化提供更加有效、快捷的计算方法。

Based on average heat transfer coefficient and bulk temperature associated formulas of engine cabin , 1D model of engine cooling system can work independently divorcing from coupling environment . It can provide more effective and efficient method for simulating cooling performance and optimizing equipment in engine cooling system .

计算冷凝平均膜传热系数的一个普遍关联式

A General Correlation for Predicting Average Heat Transfer Coefficient of Film Condensation

还讨论了平均冷凝传热系数与摩尔分数的关系。

This paper also deals with the relation of the average condensation coefficient and concentration .

提出了一种紧凑式换热器平均表面传热系数瞬变测试方法。

A transient testing technique for measuring average convection heat transfer coefficients of compact heat exchangers is suggested .

结果表明，平均传热膜系数随着载气流速的增加而增大，载气流速较小时，平均传热膜系数增加较大；

The results show that the average heat transfer coefficients increase with increasing the air velocity , decrease with increasing the CMC concentrations and the vacuum .

此外，在实验范围内，水平偏心环形腔内壁的平均表面传热系数还与偏心率有关，其随偏心率的增大而增大。

Additionally , the average heat transfer coefficient at inner wall in horizontal and eccentric annulus is related to eccentricity , and it increases with the increase of the eccentricity in the range of experiments .

研究了平均传热膜系数和局部传热膜系数随液速、载气流量及操作温度的变化规律，并分析了载气强化沸腾传热的机理。

In experiment average heat transfer coefficients and local heat transfer coefficients were investigated in various liquid velocities , carrying gas flow rates and operating temperatures . Furthermore , the enhancing mechanism of boiling heat transfer for GCE was analysed in detail .

本文引入区域平均表面传热系数的概念，在实验研究的基础上进行了肋基和肋端温度分布预测及肋片换热数值计算。

Based on the experimental studies of the natural convection resulting from heat transfer in a spiral finned tube , the numerical calculation was conducted , the average surface heat transfer coefficient for convection was defined and calculated , which has improved the computed temperature and fin efficiency .

结果表明，相界面移动速度和凝固速率随冷媒温度的降低而增加；壁面的平均蓄冷传热系数及蓄冷速率随时间的增加而减少；

The results indicated that the interface movement and the solidification rate increase with the drop of the temperature of the cool storage medium while the average cool storage coefficient and solidification rate decrease with time .