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Dynamical technical networks and dynamic network objects (DNO) as a special case of them are considered in many subject areas as objects of research, design, quality assurance, automatization, monitoring and control. In this paper we focus on the simulation of the mine air networks (MAN) as an example of dynamic network objects with distributed parameters. To improve the simulation process, we propose...
An efficient ventilation system provides underground coal mine with sufficient fresh air, removes dust and hazardous gases, which is the guarantee of the environmental safety in a laneway of coal mines. The airflow dispersion behavior seriously impacts the removal efficiency of dust in the mine network. This paper describes the dynamic characteristics of airflow and dust dispersion regularity based...
Photovoltaic electricity generation, as a renewable energy resource, is gaining more attention recently to partially replace the conventional electricity generation due to the reduction in the costs of devices as well as other factors including ‘clean energy’ concerns. One of the most important problems associated with this kind of electricity generation is cloud-driven intermittency. This feature...
This paper narrates an application of renewable source of energy in the area of generating electricity which is pollution free with the help of solar power and building newer models of integrated photovoltaic. As the world is facing critical problem of energy deficit, global warming and detoriation of environment and energy sources, renewable energy sources are getting more attention. Solar energy...
Using the methods of fault types and the effect analysis identified all types of risk existing in mine ventilation system and its index system. Deciding the constant right value for each index through the method of combing the fuzzy interval method and the analytic hierarchy process method and achieving variable weight using the value change of hazards and in the end establish the mathematical model...
The age of air is a commonly used concept in evaluating indoor air quality (IAQ). This study investigated the age of air distribution and its influencing factors in multiple rooms ventilated by multiple AHUs with recirculation. A hypothetical case involving three rooms and two AHUs was thoroughly studied by using an effective numerical method. The results revealed that, for ventilation systems involving...
Based on theoretical and experimental studies, with the design and research of ventilation system in view of the ecological sanitation restrooms' special structure, and synthesizing the impacts of the outdoor climatic factors and thermo-compression functions on air system, the project has carried on the theoretical calculation and the design to the wind system of the ecological sanitation restrooms...
In order to reduce the energy consumption on ventilation and air-conditioning, the traditional direct air conditioning system in the viscose filament workshop was changed into "machine-focused and workshop-subsidiary" air conditioning scheme by introducing the air curtain, with the technological requirements in the machine satisfied. The results showed that the energy consumption on ventilation...
The first step in designing the cooling system of a turbo generator is the ventilation system analysis. The present paper deals with a comprehensive investigation of flow parameters of a high power turbo generator. By employing the lumped-parameter model in the closed circuit of the flow network, the cooling medium flowrate and pressure drop in each element is calculated. In addition, considering...
In order to analyze the volume of air, which meet air supply conditions, per centiare Solar Wall panel can heated, also verify the feasibility and energy-conservation effect of Solar Wall System in severe cold region of China, a 3D model was established. The realizable k-ε model of the CFD Simulation Software FLUENT was applied to simulate conditions of different air supply velocity in...
Thermophysical parameters of cohesive soil are important properties in the design of the ground source heat pump system and the ventilation system of subway. In this paper, the more precise measurements are taken to study the thermophysical parameters of cohesive soil based on the transient heat flow probe method by KD2 pro. The results show that the thermal conductivity and capacity increase obviously...
The critical environmental parameters affecting plant growth in the greenhouse are temperature, relative humidity, carbon dioxide, nutrition, availability of water, and the growing media. From these factors, temperature is of primary importance to most growers because it is responsible for determining the reaction rates of various metabolic processes involved in plant growth, and also regulating temperature...
The ventilation system conveys fresh air into laneway, dilutes the noxious gases, and keeps the working environment safe and reliable, how to evaluate the performance or reliability of ventilation system has been one of the important issues in coal mine safety research field. The reliability of underground coal face ventilation was discussed in this paper based on multi-sensor system data fusion approach...
The Coal mine safety is the keystone of the industry safety in our country, in which area, ventilation system is the basis to control the hazards such as gas explosion. Ventilator system is an important part of ventilation system, which can be seen as cold standby system, also is markov repairable system. Here we discussed and calculated the reliability and remain life probability of ventilator system...
Predictive control seems to be a promising approach that can help to improve properties of existing ventilation systems applied in road tunnels. Advantages of predictive control result mainly from its ability to solve both SISO and MIMO tasks, to have regard for dynamics of process changes in a broad extent, to compensate effect of measurable and non-measurable failures and to formulate the task as...
The high temperature inside a grain storage will cause grain damage and thus lower the quality of the grain. Currently, aeration system is installed in grain storage to overcome this problem. This system has been proven practical, suitable and economical in the humid topics like Malaysia. However, the automatic aeration system is not yet available in our country. So, the objective of this project...
System reliability early warning aims to measure the rate of tolerance deviation from the reliability index borderline of the system running states, to confirm the early warning grade, and to assist decision-making warning. Analyzed and compared the methods of system early warning from home and abroad, and combined Rough Set (RS) theory and Artificial Neuron Network (ANN) technique, a new method based...
We established a heat load test facility using a graphite heating panel in 2008 in order to verify the integrity of a HIP bonded first wall. The facility is called KoHLT-1 and is currently in operation to test the Be mockups. The KoHLT-1 consists of a graphite heating panel, a box-type test chamber with water-cooling jackets, an electrical power supply, a water-cooling system, an evacuation system,...
The foggy yarn in the cotton mill makes a great negative affect on the quality of the yarn and brings huge economic losses. Based on the analysis of ventilation conditions and pressure analysis in the yarn department the measures of eliminating it are discussed. It is concluded that the most effective methods to eliminate the foggy yarn were to maintain the micro-positive pressure by reasonably ventilating...
The urban road tunnel longitudinal ventilation is a complex non-linear process with the feature of strong time-varying, always affected by a good many uncertain factors, it is difficult to establish a precise mathematical model by using the traditional linear control theory. The paper describes an intelligent model consists of two levels of neural network, the first level is a traffic flow neural...
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