Numerical estimation of two convective boundary conditions of a two-dimensional rectangular fin     

Said Abboudi 《Journal of The Franklin Institute》2011,348(7):1192-1207

A simultaneous estimation of two convective boundary conditions problem of a two-dimensional rectangular fin is proposed by numerical approach. The aim is to estimate the evolution of the distributions of the unknown heat transfer coefficients from the transient temperature histories taken with several sensors inside a two-dimensional fin. The estimation algorithm of this inverse heat conduction problem is based on the iterative regularization method and on the conjugate gradient method. An optimal choice of the vector of the descent parameters is used in this study and shows an increase in the convergence rate. The effects of some parameters (sensor number, position, measurement errors) on the inverse solutions are discussed.  相似文献   

一种全新内胆结构的高性能太阳能集热器     

李桂荣  俎建立  李杰 《环球赛鸽科技》2014,(26)

本文主要介绍了一款低成本、高性能、长寿命的太阳能集热器,该太阳能集热器具有流道和翅片一次挤出成型、流道连续折弯无焊点,热效率高、热损低的特点。  相似文献   

Heat maps: a case for inclusion in secondary statistics instruction     

Christopher Engledowl 《Teaching Statistics》2019,41(2):42-46

Heat maps have become ubiquitous in the media, yet students are rarely exposed to them and their inherent limitations and potential for misleading consumers. This article makes a case for exposing students to them in statistics instruction at the secondary and tertiary level.  相似文献   

应用吸收式热泵提高热电厂经济效能研究   总被引：1，自引：0，他引：1  

张琰  刘广建  胡三高 《科技广场》2012,(7):106-109

为了提高热电厂供热经济效能,以热泵原理的研究为基础,利用Thermoflow专业软件模拟一台亚临界600MW一次中间再热供热机组,直接以汽轮机0.4MPa,250℃抽汽作为热源向城市热网供热,供热量为440GJ/h。在此基础上对选用吸收式热泵技术回收低温余热供热的新系统进行模拟,以汽轮机0.4MPa,250℃抽汽作为吸收式热泵的驱动蒸汽,提高循环冷却水的品位供热。在供热量不变的情况下,模拟结果证实热电厂采用吸收式热泵的供热方法和传统直接以汽轮机抽汽为热源的供热方法相比,可以帮助电厂每年节省767966～1053453GJ的热量,节省标准煤26204～35945吨,同时减少排放温室气体CO269702～95613吨。说明吸收式热泵对于余热的回收可以产生巨大的经济效益和环境效益。  相似文献   

“传热学”双语教学的探讨与实践     

李雪梅 《科教文汇》2012,(1):73-74

双语教学是对传统的教学方式的创新。本文根据＂传热学＂课程的特点,从教材的选取、教学内容的安排、教学方式和考核方式等方面探讨了传热学课程双语教学的实施方法,为进一步开展教学改革、提高教学质量提供指导。  相似文献   

Role of heat stable fraction of alkaline phosphatase as an adjunct to ca 125 in monitoring patients of epithelial ovarian carcinoma     

P. K. Nigam  A. Jain  P. Goyal  R. Chitra 《Indian journal of clinical biochemistry : IJCB》2005,20(2):43-47

Heat stable fraction (HSF) of alkaline phosphatase (ALP) was evaluated as an adjunct to CA 125 as a tumour marker for epithelial ovarian cancer in a follow-up study. In our study group 63.4% of patients had elevated HSF levels (≥10U/L) and 93.3% had elevated CA 125 levels (>35U/mL). The sensitivity of CA 125 and HSF was 93.3% and 63.3% respectively. The decline in the activity of HSF, over the pre-op levels was highly significant after the first (p=0.001) chemotherapy cycle and significant after the second and third cycles (p<0.029). Thereafter, HSF activity was almost undetectable. The decrease in CA 125 levels over the pre-op levels was significant after the first, second, third (p<0.001) and fourth (p<0.034) chemotherapy cycle. HSF can be used alone or as an adjunct to CA 125 in screening and monitoring patients of ovarian carcinoma especially in remote areas where sophisticated facilities are not available and in patients in which CA 125 levels are not raised preoperatively.  相似文献   

采暖教学用综合实验台设计     

刘兵 《武汉工程职业技术学院学报》2011,23(1):77-78,80

针对供热通风与空调工程专业的实验实训教学需要,设计、自制了一套采暖实验装置。该实验装置最终可以构成散热器采暖、地板辐射采暖两大采暖系统,可用于本专业供热方面课程的实践教学,改善了实验实训教学条件,满足了专业教学的需要。  相似文献   

金属热容量的研究     

柳福提 《宜宾学院学报》2007,7(6):42-44

文章对金属热容量的经典统计理论、爱因斯坦理论、得拜模型理论进行了讨论,最后利用得拜模型理论,同时计及电子气体对金属热容量的贡献,使统计理论得到的结果能很好的解释实验结果.  相似文献   

基于应用型人才培养的金属材料及热处理课程实验教学探究     

蒋亮  刘贵群  李吉林  秦春  侯俊峰  李涌泉 《教育教学论坛》2019,(20):277-278

在材料科学与工程学院材料成型及控制工程专业培养方案修订之际,为了进一步增强本专业学生的学习积极性,培养学生具备将理论知识与实验技能相结合以解决实际问题的能力,从而适应现代社会对材料成型专业学生的需求,本文对《金属材料及热处理实验》进行了教学改革,由原有的"验证性实验"向"综合设计实验"进行转变。  相似文献   

Modelling temperature and humidity in storage spaces used for cultural property in Japan     

Masahide Inuzuka 《文物保护研究》2016,61(1):23-30

From rainy season to summer in Japan, the climate is humid. Especially in these seasons, it is difficult to maintain suitable conditions of temperature and relative humidity in exhibition and storage rooms in museums. Such climate conditions and problems are common to many countries in East Asia. Analysis using computer simulation can be a powerful tool because it is cheap and allows the simulation of a range of conditions without having to make changes to buildings and environments surrounding cultural objects. In this study, a storage building in which there is no air-conditioning unit was chosen as a target. The modelling of temperature and relative humidity in storage spaces was conducted using the Thermal and Airflow Network Model Simulation Program for buildings (NETS). The effect of seismic retro-fitting on the variation of temperature was predicted using NETS and the results were evaluated by comparing with the measured values. As a result, the heat transfer was successfully calculated and the modelled temperature represents the measured values reasonably well. Computing relative humidity by taking into account the effect of porous hygroscopic materials is challenging. In order to overcome this problem, the κ-ν model was adopted. We have some improvements but the study is still ongoing.  相似文献