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Using SF6 mixed gas instead of pure SF6 gas can effectively solve the problem of cryogenic liquefaction. However, it is necessary to verify the applicability of Dalton's Law of Partial Pressure when it is applied on analyzing the liquidation problem of SF6 mixed gas. In this paper, SF6/CF4 gas mixture is taken as an example to introduce a problem that if the mixture can meet requirement under temperature...
In a multi-energy microgrid system, meteorology factors can not only affect output of renewable resources, but also affect cooling and heating demand. Considering relationship of meteorology factors (solar insolation, wind speed, outdoor temperature) and cooling, heating, electricity demand of users in a multi-energy microgrid system, this paper proposes a model which can describe relationship between...
Shrinking reserves of natural resources as well as incisive environmental pollution oblige humanity to rethink its generally favored propulsion concept: in the last decade electro-mobility as a refurbished technology gained greater significance once more. Due to political course setting, many German cities are testing Electric Vehicles (EV) especially in public bus transport. To get to the bottom...
In this paper, analytical and simulation based analysis to verify the inherent properties of SiGe HBT is done. The major performance parameters of SiGe HBT are cut-off freuency fT, maximum oscillation frequency fmax, base transit time τb, current gain β and electron mobility μn of SiGe base. These performance parameters are responsible for the reliability of SiGe HBT. Temperature is one of the major...
Radio-electronic devices and complexes typically have a multi-level hierarchical structure with complexly interconnected elements within the system and are often used in difficult operating conditions, including the conditions of information conflict. These devices and complexes have to meet strict requirements in reliability, efficiency, and quality. Traditionally, the problems of the analysis of...
A solution to improve the lower overall photo-voltaic panel efficiency is to provide it with a forced cooling system. In this way a hybrid conversion device is derived and electric and thermal energies are obtained simultaneously. To model such system, two major and different components should be considered: solar cells and cooling radiator. The main purpose of this paper is to study the electrical...
Today, phase change material (PCM) are integrated to cooling system of photovoltaic panels. There are many reasons (safe, abundant, affordable…) to use phase change material (PCM) in this field. The PCM may play an important role in increasing efficiency of PV cells. This paper describes a detailed physical issue in order to understand the effect of PCM in keeping PV cell temperature close to ambient...
This paper presents a design scheme of cycling oil cooling for driving motors applied in electric vehicles on the basis of heat transfer theories and hydromechanics. The average wall temperature and pressure drop of the oil channel can be obtained from the proposed design scheme. Then, the effects of channel dimensions and the oil temperature on cooling performance are investigated. Finally, the accuracy...
The demand on energy is growing driven by the industrial and socioeconomic development in many developing countries such as Morocco. Conventional fossil energies are pollutant and will eventually disappear in few decades. Therefore, renewable energies represent a good alternative because they are economical, permanently available and friendly to the environment. Geothermal energy is a renewable energy...
Two approaches for modelling the impact of ambient conditions on powerlines have been developed and recognised as international standards. Methods of thermal analysis of powerlines have been collated and presented in standards by both the Institute of Electrical and Electronics Engineers (IEEE) and International Council on Large Electric Systems (Conseil International des Grands Réseaux Électriques,...
Air-cooled Data Centers absorb heat in central room air conditioners or air handlers and most commonly reject the heat through cooling towers to ambient air. The energy efficiency of the overall cooling system is determined by the energy efficiency of its components, its thermodynamic design and layout, and the protocol for its control, operation and its operational set points. The current work is...
The aim of this paper is to present mathematical model which can be used to predict influence of ceramic coolers geometry on their cooling abilities. The model was derived using Design of the Experiment methodology.
Forced convector, which is one of the low temperature heating end users, not only high efficient but also conveniently adjustable, fits for low temperature metering heating system which can raise energy efficiency. So in this paper, in order to convenient for engineering application of forced convector, heat dissipation calculation method and heat dissipation characteristic equation are put forward...
A simulated annealing framework is presented for learning gene regulatory networks with predefined attractors, under the threshold Boolean network model updated sequentially. The proposed method is used to study the robustness of the networks, defined as the number of different updating sequences they can have without loosing the attractor. The results suggests a power law between the frequency of...
Improvements in electronic components cooling techniques are paramount to the continuous increase in the complexity and thermal output of circuit boards. Recent studies show that the uniform distribution of the blocks might not be the optimum choice. In this paper, a parametric study of the different choices for inter-block spacing is performed numerically using the finite volume method. Multiple...
Thermal analysis becomes an important tool to reflect the solidification behavior of cast irons. In this paper, wavelet filter and Support Vector Machine (SVM) are used to search six important characteristic numbers of thermal analysis in order to improve the calculating reliability and accuracy of thermal analysis. Firstly, wavelet filter is used to filter the cooling curve and cooling rate curve...
The method of ventilating system optimization for Roots Blower workshop has been studied according to the problem of bad ventilating effect with the transmitted medium of carbon monoxide in a chemical factory based on computational fluid dynamics (CFD). An optimized ventilating system has been designed and carried out as follows: the ventilating system is effective with the cooling air flowing in...
In this paper, the heat generation principle of rotary MRF (MagnetoRheological Fluids) dampers was investigated, a mathematical model of heat source distribution was proposed, the temperature field caused by the heat sources was numerically simulated by means of ANSYS software, and the law of temperature distribution and rise was revealed. On the basis, a forced water-cooling system for the MRF dampers...
In order to improve the system running economics of the direct air-cooled unit, based on the thermodynamic model of the air-cooled system, through considering the steam turbine power and the consumption power of fan, this article has researched the optimal back-pressure of the unit in theory under the running conditions, and given the basic law about the optimal back-pressure affected by the corresponding...
To enhance the temperature control accuracy and solve the lag problem of continuously sintering furnace, this paper developed temperature control system based on the analysis of the temperature field, adopted finite element analysis module, and respectively analyzed sintering furnace temperature field influenced by atmosphere, furnace door opening or closing, as well as interaction between sintering...
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