共查询到20条相似文献,搜索用时 0 毫秒
1.
The fan pressurization method for measuring air leakage through the building envelope relies on the assumption that the extraneous air leakage (EAL) through paths other than those through the specimen being tested is negligible. When EAL does exist, the calibration procedure by ASTM Standard E-283 is used to measure EAL values by covering the specimen or guarded chambers are used to equalize the pressure differences across these unintended paths. A new testing method, the flexible double-chamber method, is presented in this paper for large specimens where the above two approaches are difficult to implement and where flexible chambers are more easily applied. The experimental procedure and data processing routine are presented for the case of a full-size metal curtain wall specimen. The EAL is estimated by regression analysis in data processing. Inference analysis, multivariate error analysis, and the Monte Carlo simulation technique are also presented to examine the estimation errors. 相似文献
2.
建(构)筑物渗漏水浅析 总被引:1,自引:0,他引:1
通过对部分建(构)筑物渗漏水工程(如屋面漏水、地下工程漏水、厕浴间漏水、外墙渗水)的调查、分析,发现其主要原因为:防水设计不合理,材料质量无保证,施工质量差。建(构)筑物渗漏水影响建(构)筑物外观和使用功能;严重者导致钢筋锈蚀、混凝土发生碱骨料反应,受力系统承载力降低,危及主体结构安全。为此,应规范防水工程设计、施工,加强防水工程的监理和质检监管力度,增大防水工程的投入,采用防水新材料、新技术、新工艺等措施防治建(构)筑物渗漏水。 相似文献
3.
高志强 《冶金设备管理与维修》2014,(5):51-52
针对105m^2烧结机漏风问题,通过采用磁隙密封技术,在大大降低了烧结机漏风率的同时,还提高了烧结机的作业率、降低了风机的电力消耗. 相似文献
4.
5.
Understanding Air Release through Air Valves 总被引:1,自引:0,他引:1
M. Carlos F. J. Arregui E. Cabrera C. V. Palau 《Canadian Metallurgical Quarterly》2011,137(4):461-469
Water transients with entrapped air can originate large pressure peaks that can severely damage distribution networks. Entrapped air can have a damping or amplifying effect on these undesirable pressure peaks. Unfortunately, the complexity of the phenomenon too often makes it difficult to obtain a fully reliable prediction about when air pockets will mitigate or accentuate water transients. Furthermore, the value of some of the parameters involved in the conventional numerical models cannot be calculated or measured and need to be determined through a calibration process. With the aim of overcoming most of the aforementioned uncertainties, this paper summarizes a complete set of tests conducted at WL | Delft Hydraulics. These tests were simulated by means of a tailored numerical model that includes a set of parameters whose values were determined by means of a calibration process. The experimental setup, a large-scale facility, consisted of a single steep pipeline with an air valve installed at its top end. Air release through different air valves was tested under different conditions. 相似文献
6.
Predicting Leakage through Composite Landfill Liners 总被引:1,自引:0,他引:1
Leakage through composite landfill liners having various characteristics was analyzed using existing analytical and numerical models developed for the study. Three-dimensional numerical models were used to analyze leakage through circular defects and two-dimensional numerical models were used to analyze leakage from defective seams. Leakage rates predicted with the numerical models were compared to leakage rates predicted using existing equations and analytical models currently being used. These comparisons show that existing equations and analytical models all have limitations and no universal equation or method is available for predicting leakage rates. To overcome some of the deficiencies in the existing equations and models, new equations were developed based on results from the numerical models. Recommendations are made for using the new equations, existing equations, and analytical models to predict leakage rates in thick composite liners having a geomembrane overlaying a compacted soil liner and thin composite liners having a geomembrane overlaying a geosynthetic clay liner. 相似文献
7.
Laboratory apparatus to simulate flow through culverts has been used to collect discharge and water level measurements. Two different shapes of culvert barrels, namely square and circular, were tested. The measurements presented in this note are intended to provide useful information regarding the variety of flow regimes (including overtopping) through culverts, and the transitions from one flow regime to another. It is known that modeling the culvert flow regimes and capturing the transitions among these regimes numerically is a challenging task. To that effect, the laboratory measurements presented herein can provide a testing and validation data set for numerical modeling of hydraulic structures such as culverts. 相似文献
8.
9.
本文对空压机在生产中出现的一次设备漏油事故发生过程和处理方法进行了较为详细的介绍,并对产生的原因进行了分析。 相似文献
10.
对应用于民用焦炉煤气加压系统的卧式罗茨风机出现的齿轮箱漏油、漏煤气等故障进行了全面分析,并提出具体可行的解决方法,有效解决了齿轮箱漏煤气导致漏油的问题。 相似文献
11.
建筑防水在建筑设计和施工中占有十分重要的地位。该文通过材料、设计、施工、管理四个方面对建筑屋面防水层渗漏的原因进行分析,并提出相应的防治措施。 相似文献
12.
13.
14.
烧结机头、尾部及中部滑道是烧结机漏风的主要部位,也是降低烧结漏风率的主要着眼点,分析烧结机的密封点的受力状态,改变其密封结构是减少烧结漏风的主要方法. 相似文献
15.
This paper presents a case study of an institutional building's heating, ventilation, and air-conditioning (HVAC) system that was not providing satisfactory comfort control. In the investigation, significant design, construction, and operational problems were discovered. Poor communication between the architect, consulting engineers, construction personnel, and owner∕financier was a significant factor in the failure of the comfort control system. Problems with the windows, insulation, design of the system zones, supply air fan, and indoor air quality due to poor ventilation were also identified and investigated. Recommendations for correction of these problems range from obvious, low-cost actions to more substantial retrofits of the HVAC system. Actions that should have been taken during the design stages of the project, as well as postoccupancy corrective measures, are discussed with emphasis on comfort, health, and economics. The results of this project show that a well-designed HVAC system will operate poorly if the building is not constructed or operated as planned. This case study should help institutional building contractors, owners, and operators avoid or identify and correct similar problems with their planned and existing comfort control systems. To ensure successful operation of their designs, HVAC designers need feedback from the architect, contractors, building owners, and occupants. 相似文献
16.
P. C. Yannopoulos A. C. Demetracopoulos Ch. Hadjitheodorou 《Canadian Metallurgical Quarterly》2008,134(6):843-846
An economical methodology is proposed by which distinct air bubbles released at the bottom of a channel may be utilized for determining the local flow discharge q per unit width. Simple theoretical analysis shows that q is linearly dependent on the rise length L of bubbles released at the bottom. This length is the horizontal displacement of the bubbles between the release cross section and the cross section where they emerge. The theoretical findings were compared with measurements in three laboratory flumes and in an irrigation canal. Based on the above, a relationship between L and q has been established. The empirically proposed relationship is very useful for fast discharge measurements in channels and natural streams. 相似文献
17.
18.
介绍贵冶动力车间PAP PLUS系列离心式空压机轴封方式,对空压机运行时齿轮箱底座、轴封出现漏油现象进行分析。阐述了通过引入射流装置使齿轮箱和油箱形成"负压"从而彻底治理渗漏点的一种办法,并对射流装置结构原理、基本理论及设计依据进行介绍。 相似文献
19.
Martin H. Murray 《Canadian Metallurgical Quarterly》1999,125(4):159-162
The profession of civil engineering needs graduates with many technical and generic skills. A program of peer instruction and peer mentoring within courses taken by first-year students at Queensland University of Technology in Australia builds networks between junior and senior students, leading to a culture of collaboration and teamwork and a learning environment more akin to that in which professional engineers find themselves. Among the benefits of this program are high student satisfaction, opportunities for development of leadership and organizational skills, and dramatically improved academic results. 相似文献
20.
本文结合多年的实践经验在屋面防渗漏、外墙面的防渗漏、外墙窗口防渗漏、厨房及卫生间防渗漏这几个方面进行了浅略分析,科学的提出了在工程施工中应采取的防渗措施以供大家参考。 相似文献