نتایج جستجو برای ' Dust '

 This study was carried out in a closed test chamber under natural decay, negative ionic air cleaner application, as well as air mixing mechanism with negative ionic air cleaner. Among three operation modes, the air mixing mechanism with negative ionic air cleaner can reduce particles better under the flow field condition. In the air mixing, especially vigorous one (5 ACH (Air Changes per hour)), enhanced the air cleaning effect. The highest removal efficiency was measured at a height of 0....

  The aim of the present study was to identify the main sources contributing to the air pollution of three indoor environments of different use: a museum, a printery industry and an office. For that purpose, particulate matter (TSP, PM10, PM2.5), inorganic pollutants (NOx, SO2, O3) and organic compounds (BTX, formaldehyde) were monitored. Factors such as the kind of the activities occurred indoors, the emissions from the existing equipment, the number of occupants, the ventilation patt...

 The aim of the present work was to evaluate the thermal environment of workers in the greenhouse-construction industry in SE Spain. For this, the heat stress of these workers was evaluated by the WBGT index, on developing quadratic equations of the maximum and minimum of this index according to the time of day. High correlation coefficients and good distributions of residuals were found. This evaluation revealed a high or very high risk of heat stress during the months of June to September...

  Ventilation, heating and cooling systems in industrial premises are important issues as they are related to both energy cost and indoor climate management and the health of the premises’ occupants. The present paper has two aims: (1) to evaluate the performance of Computational Fluid Dynamics (CFD) for planning new or renovating existing industrial ventilation systems, and (2) to evaluate the performance of two different supply principles in a contaminant-intensive process with...

 A non-unidirectional airflow cleanroom in electronic industries is prone to be challenged by the wide spread of hot air and contaminants dissipated from process tools to surrounding area, resulting from the collision of the uprising hot air current from the tools and the downward cold air from ceilings. To effectively remove the dissipated heat and maintain the required cleanliness level, we proposed an innovative fan dry coil unit (FDCU) return air system (referring to  and ), consis...

 The spontaneous discoloration of indoor surfaces which occurs especially during the heating period has been intensively investigated in Germany since the beginning of the 1990s. On the basis of earlier studies and a questionnaire this phenomenon, referred to as ‘black dwellings’ or ‘black magic dust’ (BMD), was attributed to the presence of semi-volatile organic compounds (SVOCs) and their interaction with dust and particles. In a project funded by the German Federa...

 In several technical applications, it is convenient to carry out physical separation between two neighboring zones with different physical characteristics (such as temperature or contaminant concentration), using a two dimensional gaseous jet, often called air curtain. In this paper, a submerged rectangular air jet, simulating an air curtain, has been investigated in order to infer the capability to reduce the transfer of dusty air between a “clean” zone and a contaminated envi...

 Due to the deregulation of power industry, the transmission expansion plan is different from the process done by the integrated monopolies. In a monopoly electric market, the transmission expansion plan is carried out by the vertically integrated utility. The power company integrates its generations’ exploiting plans and its transmission expansion plans to maintain the system reliability. While in a deregulated power industry, generation, transmission, and distribution companies belo...

 Nowadays implementation of quality management systems is discussed as a necessity to guarantee the survival of organizations. Also, quality management in Projects is placed as one of the most important knowledge fields of project management. Given the low quality of construction sector and wasting national wealth and the low-life buildings, it will be necessary to discuss about quality management and its necessity in this paper. In this paper moreover the introduction of quality management...

 Development of high energy efficiency spray dryers is of great importance for the future of the dairy powder industry. The present research studied energy efficiency in an industrial scale spray dryer with the second law of thermodynamics. The entropy production rate is computed from the CFD modeling results of the transient multi-phase flow in the spray dryer. Influences of particle size, inlet air flowrate and inlet air temperature on the entropy production rate are analyzed. The results...