A demand for renewable alternatives that would be able to deal with the problems related to well-being is directly linked to the world’s growing needs to save energy and reduce environmental costs. For a project impl...A demand for renewable alternatives that would be able to deal with the problems related to well-being is directly linked to the world’s growing needs to save energy and reduce environmental costs. For a project implementation addressing these issues, it is essential to know the climatic conditions of the target area. Taking natural ventilation, climatic factors, and renewable alternatives as important sources of comfort, in this work, passive strategies, through the utilization of microclimate elements as well as the location of outside obstacles, were imposed on an initial and specific project. The objective was to introduce obstacles which could interfere in the field of external wind and evaluate whether this outside intervention is able to make changes in indoor air circulation. The wind fields for the studied cases were obtained by computational simulations, and their consequences were analyzed to attain thermal comfort. The method adopted to obtain the wind fields was a Petrov-Galerkin type method, which is a stabilized mixed finite element method of the Navier-Stokes equations considering the incompressibility and formulated in primitive variables, velocity and pressure. The obtained results point to the solutions that promote the increase or decrease of the wind-field intensity.展开更多
This paper analyses microclimate parameters viz. rainfall, temperature, relative humidity, heat index, wind speed, wind direction, atmospheric pressure, dew point, air dust and air density around the Twangiza gold min...This paper analyses microclimate parameters viz. rainfall, temperature, relative humidity, heat index, wind speed, wind direction, atmospheric pressure, dew point, air dust and air density around the Twangiza gold mine, Eastern DR Congo. Results show that in previous decades, May did not use to be a dry month as it was an integral part of the shorter rainy season and September has become drier. This depletion of May and September rainfall is a change in the study region. A significant difference was observed between both septennia (2010-2017 and 2018-2024) regarding the second rainy season (B = February-May) only at one of stations. Significant differences occurred between both septennia regarding the dry season (June-August), with more rainfall in the second septennium (2018-2024). This confirms a microclimate change in the study area, even at a range of 3 - 10 km distance, indicating patchy rains. The values of temperature and heat index increased during the second septennium;e.g. 25.3˚C max dry season 2018-2024 vs 23.4˚C dry season 2010-2017;thus differences of 1.9˚C for temperature and 1.5˚C for heat index. This is an indicator of warming in the microclimate along the quindecinnial. The results show that the mine generates seven to ten times more dust when in operations due to moving equipment and other ancillary equipment. The residential and industrial guideline limits did not change even when the mine was operational. This study has the merit of illustrating the accuracy of the best regional climate change prediction models, such as the GIZ long-term forecast for the neighbor country, Burundi, which predicted the increase of rains in the rainy season, the depletion of rains in months leading up to the dry season (August/September), implying the prolongation of the dry season. They also noted a high probability that annual average air temperatures will gradually increase.展开更多
基金the FAPERJ(State of Rio de Janeiro research supporting foundation)
文摘A demand for renewable alternatives that would be able to deal with the problems related to well-being is directly linked to the world’s growing needs to save energy and reduce environmental costs. For a project implementation addressing these issues, it is essential to know the climatic conditions of the target area. Taking natural ventilation, climatic factors, and renewable alternatives as important sources of comfort, in this work, passive strategies, through the utilization of microclimate elements as well as the location of outside obstacles, were imposed on an initial and specific project. The objective was to introduce obstacles which could interfere in the field of external wind and evaluate whether this outside intervention is able to make changes in indoor air circulation. The wind fields for the studied cases were obtained by computational simulations, and their consequences were analyzed to attain thermal comfort. The method adopted to obtain the wind fields was a Petrov-Galerkin type method, which is a stabilized mixed finite element method of the Navier-Stokes equations considering the incompressibility and formulated in primitive variables, velocity and pressure. The obtained results point to the solutions that promote the increase or decrease of the wind-field intensity.
文摘This paper analyses microclimate parameters viz. rainfall, temperature, relative humidity, heat index, wind speed, wind direction, atmospheric pressure, dew point, air dust and air density around the Twangiza gold mine, Eastern DR Congo. Results show that in previous decades, May did not use to be a dry month as it was an integral part of the shorter rainy season and September has become drier. This depletion of May and September rainfall is a change in the study region. A significant difference was observed between both septennia (2010-2017 and 2018-2024) regarding the second rainy season (B = February-May) only at one of stations. Significant differences occurred between both septennia regarding the dry season (June-August), with more rainfall in the second septennium (2018-2024). This confirms a microclimate change in the study area, even at a range of 3 - 10 km distance, indicating patchy rains. The values of temperature and heat index increased during the second septennium;e.g. 25.3˚C max dry season 2018-2024 vs 23.4˚C dry season 2010-2017;thus differences of 1.9˚C for temperature and 1.5˚C for heat index. This is an indicator of warming in the microclimate along the quindecinnial. The results show that the mine generates seven to ten times more dust when in operations due to moving equipment and other ancillary equipment. The residential and industrial guideline limits did not change even when the mine was operational. This study has the merit of illustrating the accuracy of the best regional climate change prediction models, such as the GIZ long-term forecast for the neighbor country, Burundi, which predicted the increase of rains in the rainy season, the depletion of rains in months leading up to the dry season (August/September), implying the prolongation of the dry season. They also noted a high probability that annual average air temperatures will gradually increase.
