نتایج جستجو برای ' Emission '

A New Environmental Perspective to The Concrete, The Most Used Material in Construction as a Significant Pollution Source the use of the concrete in construction around the world is twice as much as the total of all other building materials, including wood, steel, plastic and aluminum. Due to some concrete ingredients such as cement production release many greenhouse emissions to the atmosphere. After fossil fuels and land-use change, it is the third-largest source of anthropogenic emissions of...

Simulation study of natural ventilation on energy efficiency and reduction of Co2 emission in a humid climate Nowadays, researchers have conducted many studies about the role of natural ventilation as a passive cooling system. This would also help in reducing costs, excessive use of energy and the consequential environmental effects of year-round air conditioning. In this regard, energy consumption and Co2 emissions associated with buildings has a significant impact on the environment. The cur...

An Applied comparative study about the countries with low sustainability and high CO2- emission and advanced sustainability knowledge in Europe and giving practical models to improve and implement sustainability solutions (case: Iran, Denmark, Germany) Nowadays, we passed the 1st, 2nd, 3rd and 4th waves (ages). Before 1970 fossil energies and various businesses could affect and improve technologies, economy. Since we reached the 70ies the technologies and renewable energies able to change and i...

The influence of the fuel temperature on NOx formation was investigated numerically. For this purpose CFD modeling of NOx emission in an experimental furnace equipped with high temperature air combustion (HiTAC) system was studied. The comparison between the predicted results and measured values have shown good agreement, which implies that the adopted combustion and NOx formation models are suitable for predicting the characteristics of the flow, combustion, heat transfer, and NOx emissions in ...

Rust and Thijsse have previously shown that changes in global annual average temperature anomalies T(ti) compiled by the Climatic Research Unit vary linearly with atmospheric CO2 concentrations c(ti). The c(ti) can be related to man-made CO2 emissions F(ti) by a linear regression model whose solution vector gives the unknown retention fractions γ(ti) of the F(ti) in the atmosphere. Gaps in the c(ti) record make the system underdetermined, but the constraints 0 ≤ γ(ti) ≤ 1 make ...

The aim of this study wasthe use of data envelopment analysis for determined the energy efficiency and find the optimum energy consumption in dairy farms of Mazandaran Province of Iran. In this study have been used from two approaches constant returns to scale and variable returns to scale model of data envelopment analysis for determined the degrees of technical efficiency, pure technical efficiency and scale efficiency. Moreover, the effect of optimum energy consumption on greenhouse gas emiss...

Increasing climate change challenges due to human activities has made new insight to reduction environmental loads of industrial processes. Not only construction sector uses almost the half of industrial usage energy but also releases a significant amount of waste and pollutant material to the environment. Cement production as the main material in the construction sector is one of the most pollution reason which needs to reduce its impacts on the total environment. From this point of view, human...

The strict environmental laws, the cost of oil and its limited resources, have made the engine manufacturers to think of other energy resources rather than oil and its products. In this study the effect of exhaust gas recirculation (EGR) on performance and emission characteristics of a SI engine fueled separately with gasoline, Bio-hydrogen and Bio-ethanol have been compared and discussed. In order to do that the engine has been simulated with a three dimensional computational fluid dynamics (CF...

Acoustic emission (AE) monitoring of engineering structures potentially provides a convenient, cost-effective means of performing structural health monitoring. Networks of AE sensors can be easily and unobtrusively installed upon structures, giving the ability to detect and locate damage-related strain releases (‘events’) in the structure. Use of the technique is not widespread due to the lack of a simple and effective method for detecting abnormal activity levels: the sensitivity of...