热管蓄冰过程的数值模拟研究．

通过建立热管的简化热阻模型,采用数值计算的方法模拟了热管的动态蓄冰。模拟结果与实验结果吻合。同时,对热管冷凝段和蒸发段的长度比为1：2和1：4两种形式进行了数值模拟比较。结果表明,1：4的布置形式更优。     

蓄冰空调系统中分时蓄冷运行的应对策略研究

分时蓄冷方式主要是充分利用低谷电来制冰蓄冷,而在高峰时,以融冰供冷不开制冷机来满足空调负荷要求,真正起到在电网中削峰填谷的作用。分时蓄冷方法在融冰循环运行时,流量变化幅度大,情况特殊,因此需要系统有应对策略。     

并联冰蓄冷空调在汽车上的应用

本文分析了汽车空调采用冰蓄冷技术的优点：降低油耗并且可以满足制冷负荷增大时的舒适性，并对其与汽车运行工况的匹配控制作了探讨。     

并联冰蓄冷空调在汽车上的应用

本文分析了汽车空调采用冰蓄冷技术的优点:降低油耗并且可以满足制冷负荷增大时的舒适性,并对其与汽车运行工况的匹配控制作了探讨。     

制取流体冰新方法及高效冰蓄冷研究

冰蓄冷空调能够有效地将日间部分高峰用电负荷转移到夜间低谷时段,是我国当前积极推广和鼓励的一项重要“削峰填谷”措施。制取块冰、壳冰存在的共同问题是：当冰在固体制冷面形成后,因冰的导热系数很小,将造成很大的传热热阻,并且随冰层厚度的增加而急剧增大,因此制冰能耗高。流体冰(或称为冰浆,Ice Slurry)由于制冰过程中在固体传热面上无冰层产生,实现流动换热,因此制冰过程传热温差小,制取流体冰的热力性能系数可比制取块冰提高近一倍。但现有流体冰制取方法用于冰蓄冷还存有问题,为克服所存在的不足和使制取流体冰的方法更为简单、高效,文中提出了一种制取流体冰的新方法．采用水与非相溶液体接触换热结冰来取代以往水与固体壁面换热结冰,通过将水雾化成细小水滴而大大增加水结冰过程的传热面积,有效地减小了冰层热阻。该种新型制冰方法可使冰蓄冷措施更为经济有效。     

通信基站热管加蓄冷被动散热的模拟研究

研究了用于通信基站的被动散热系统,该系统包含热管和蓄冷环节.通过构建数学模型并求解,获得了主要传热参数对散热性能的影响.模拟结果表明:可实现基站内气温波动的幅度(2℃)远小于环境温度波动的幅度(当20℃时),具有较大的抗环境温度干扰能力;蓄冷水量的增加能够提高系统的热惯性,但不能改变最终系统平衡温度;水箱面积的增大可降低系统各环节的平衡温度,同时会减弱系统的抗环境干扰能力;在特定工况下作为热管工作冷源的蓄冷水温可维持低干环境空气波蜂温度运行,但其削峰效果并不明显.     

热管空气预热器在420t/h锅炉上的应用研究

针对菏泽发电厂2号锅炉低温段下级管式空气预热器腐蚀、堵灰以及漏风严重导致锅炉处于不经济和限出力运行的问题.对空气预热器的腐蚀和堵灰进行了分析.通过严格控制排烟温度,采用镍基渗层钎焊螺旋翅片管的热管空气预热器替换原低温段下级管式空气预热器,并进行了测试和观察.结果表明:低温段下级热管空气预热器运行情况良好、性能稳定,未发生堵灰、腐蚀、磨损、漏风现象,同时减少了送、引风机厂用电率,提高了锅炉效率.     

无吸液芯碳钢-水径向热管的实验研究

首先对径向热管的启动性能进行研究,并测定热管的启动温度,其次在不同工况下,进行了径向热管传热性能实验,采集了热管壁各测温点的温度数据,最后对实验中的数据做了处理.     

热管余热回收蒸汽发生系统在烧结环冷机上的应用

阐述重力热管蒸汽发生器的工作原理、工艺流程,热管蒸汽发生系统在南钢130m2烧结环冷机上的应用及产生的经济效益.     

蓄冷节能技术在冷库中的应用研究

对蓄冷节能技术在冷库中的应用进行了方案的可行性探讨,并通过实例进行了经济性分析。结果表明：蓄冷节能技术在冷库中的应用是可行的,但必然增加初投资,蓄冷系统投资额的增加能在3年左右通过运行电费的节省加以回收。     

热管式冰蓄冷空调的运行特性及分析

文中论述了热管在冰蓄冷中应用的原理与特点,扩展了热管的应用范围,分析了热管式蓄冰系统的动态特性,建立了相应的物理模型,该模型可为热管式蓄冰系统的设计提供理论依据。     

Study on the critical conditions of ice formation for a continuous ice making system in a cooling pipe

This paper deals with a continuous ice making method which could be used to provide an ice storage system using off-peak electricity during nighttime. The critical condition for an ice blockage to occur in the cooling tube has been examined in terms of the concentration of water-propylene glycol solution and thermo-hydraulic operating parameters. The results obtained show that nondimensional correlation equations for the critical condition have been derived as a function of thermo-hydraulic parameters in the laminar and the turbulent flow regions. The equations can be used to predict whether an ice making system is operating in a continuous ice making condition or is in the ice blocking phase. © 1998 Scripta Technica. Heat Trans Jpn Res, 27(1): 74–83, 1998     

半开式自调节重力热管应用研究

本文提出了一种新型半开式自调节重力热管,解决了开式重力热管存在的密封液倒灌和液位失温问题。可广泛应用于电站锅炉排烟及高温工业废气的余热回收,具有较高的可靠性和显著的节能效果。     

The correlation between the number of fins and the discharge time for a finned heat pipe latent heat storage system

The concept of a solar energy heat pipe latent heat storage system is presented. In order to assure large charging and discharging rates, finned heat pipes are used to transfer heat to and from the phase-change material (paraffin in this case). The evolution of the solid - liquid interface is studied by considering the radial heat transfer (due to the heat pipe wall) and the angular one (due to the fin). Two mathematical models, corresponding to exponential, respectively polynomial functions describing the fin temperature profile are presented and the results are compared. The two models allow the evaluation of the discharge time of the storage unit for a certain number of fins for a single heat pipe. When the discharge time has a fixed value, the methods presented in the paper allow to conclude whether the number of fins is sufficiently large to assure the complete solidification of the phase-change material.     

Fundamental study of the melting process of crushed ice in a heat storage container

This report deals with heat transfer in the melting process of crushed ice filling an ice/water heat storage container. The volumetric heat transfer rate and melting end-times are measured for the cases when rectangular-type, small-stone-type, and particle-type ice in the container are melted using circulating warm water. The melting end-time is shortest for small-stone-type ice and longest for particle-type ice. The volumetric heat transfer rate is greater for small-stone-type ice and rectangular-type ice than for particle-type ice. The flow rate of the circulating warm water fed into the tank from an inlet pipe has a major effect on the heat transfer rate. © 1999 Scripta Technica, Heat Trans Asian Res, 28(7): 583–596, 1999     

Experimental research on heat transfer of pulsating heat pipe

Experimental research was conducted to understand heat transfer characteristic of pulsating heat pipe in this paper, and the PHP is made of high quality glass capillary tube. Under different fill ratio, heat transfer rate and many other influence factors, the flow patterns were observed in the start-up, transition and stable stage. The effects of heating position on heat transfer were discussed. The experimental results indicate that no annular flow appears in top heating condition. Under different fall ratios and heat transfer rate, the flow pattern in PHP is transferred from bulk flow to semi-annular flow and annular flow, and the performance of heat transfer is improved for down heating case. The experimental results indicate that the total heat resistant of PHP is increased with fill ratio, and heat transfer rate achieves optimum at filling rate 50%. But for pulsating heat pipe with changing diameters the thermal resistance is higher than that with uniform diameters.     

环路型脉动热管的工质流动和传热特性实验研究

建立了部分可视化的环路型铜-乙醇脉动热管试验台,研究了充液率、倾斜角度、环路数目等因素对脉动热管传热性能的影响。结果表明:不能形成脉动效应时工质的流型是间歇振动,形成脉动效应时工质的流型是弹状流或环状流;最佳倾角为70°~90,°最佳充液率在50%左右;热阻随着环路数目的增加而减小。     

Study on heat transfer characteristics of porous metallic heat sink with conductive pipe under bypass effect

The work investigated the forced convection heat transfer of the heat sink situated in a rectangular channel by considering the bypass effect. The fluid medium was air. The relevant parameters were the Reynolds number (Re), the relative top by‐pass gap (C/H), and the relative side by‐pass gap (S/L). The size of the heat sink was 60 mm (L)×60 mm(W)×24 mm(H). Two heat sinks were employed as test specimens: (A) the 0.9‐porosity aluminum foam heat sink and (B) the 0.9‐porosity aluminum foam heat sink with a 20 mm diameter copper cylinder. The copper cylinder was used as a conductive pipe of heat sink. The average Nusselt number was examined under various forced convection conditions. Experimental results demonstrate that increasing by‐pass space decreased the Nusselt number. Besides, the average Nusselt number of mode B heat sink was higher than that of mode A heat sink by 30% for the case without by‐pass flow. The heat transfer enhancement by the copper cylinder would decline as the by‐pass space grew. © 2009 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20247     

微槽群平板热管散热器传热性能的研究

分别选择不同的翅片间距和高度,对一种新型微槽群平板热管散热器的翅片结构进行优化,得到了热管散热器的最佳整体结构。结果表明:翅片的间距为14mm、高度为60mm时,平板热管散热器的传热性能最好。将热管、管脚以及翅片的温度与实验结果进行对比,结果吻合良好。