The Experts below are selected from a list of 78 Experts worldwide ranked by ideXlab platform
Laurentiu Tacutu - One of the best experts on this subject based on the ideXlab platform.
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Local and General Ventilation System for an operating room with surgeons and patient
E3S Web of Conferences, 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the air flow from a unidirectional air flow (UAF) System and a local Ventilation System will interact with each other. The study analyzes the air circulation near the operating table at different air flow velocities from both Systems. The air flow velocities correspond to the usual range of velocities recommended by norms and guidelines. The research was approached by numerical and experimental studies. The thermal plume of the occupants (patient and surgeon) were measured by Particle Image Velocimetry (PIV) and thermography (IR). The results of the measurements were compared with the results from the numerical case. A mesh independence study was carried out for the numerical case. The study showed that velocities ≥0.2 m/s from the UAF, depending on the height of the room, can overcome the thermal plume generated by a human subject with a moderate activity (100÷120W). The velocities from the local Ventilation System need to be higher with at least one step, in accordance with the distance from the Ventilation System to the operating wound, in order to avoid disturbances generated from the UAF System.
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Interaction between a local and a General Ventilation System for an operating room with patient
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the airflow from a unidirectional airflow (UAF) System and a local Ventilation System will interact with each other. The airflow velocities used are within the usual ranges recommended by literature. The research was conducted by numerical and experimental studies. The numerical case represents an operating room (OR) with a UAF diffuser, a local Ventilation System, known as a mobile laminar airflow (MLAF) and outlet diffusers. The experimental campaigns were made to determine the thermal plume from a patient using Particle Image Velocimetry (PIV) and thermography (IR). From the thermal plume study, it has been noticed that velocities ≥0.2 m/s from the UAF can overcome the thermal plume generated by a human subject with a moderate activity. The studies reveal that velocities from the local Ventilation System need to be higher with at least 0.1 m/s, in order to avoid disturbances generated from the LAF System.
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General Ventilation System Optimization Study for Environment Improvement of Sludge Dewatering Area from a Wastewater Treatment Plant
Energy Procedia, 2017Co-Authors: Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Alexandru Vasilescu, Laurentiu TacutuAbstract:Abstract One of the most important facilities in Romania for the wastewater treatment is located near Bucharest. The paper focus on the final sludge dewatering line where the working environment has recently been deemed unsuitable for human exploitation due to different chemical compounds such as water vapour, hydrogen sulphide, ammonia and calcium oxide dust. To avoid problems, the company has to manage very careful the human activity with long breaks to protect their employees so they decided to change the Ventilation solution, and to find the strategy of optimal air distribution. Our study defines the optimal solution for the General Ventilation of the room for highly dehydrated sludge and for the improvement of technological parameters and working conditions. This solution obtained by means of numerical simulation Generally adapts the existing Ventilation System and prepares the implementation of local solutions to capture and treat the effluents of the treatment line. In order to propose a solution for the General Ventilation System, we performed numerical simulations using Computational Fluid Dynamics models. The numerical models were calibrated and validated with measured data obtained in different experimental campaigns in situ.
Cristiana Croitoru - One of the best experts on this subject based on the ideXlab platform.
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Local and General Ventilation System for an operating room with surgeons and patient
E3S Web of Conferences, 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the air flow from a unidirectional air flow (UAF) System and a local Ventilation System will interact with each other. The study analyzes the air circulation near the operating table at different air flow velocities from both Systems. The air flow velocities correspond to the usual range of velocities recommended by norms and guidelines. The research was approached by numerical and experimental studies. The thermal plume of the occupants (patient and surgeon) were measured by Particle Image Velocimetry (PIV) and thermography (IR). The results of the measurements were compared with the results from the numerical case. A mesh independence study was carried out for the numerical case. The study showed that velocities ≥0.2 m/s from the UAF, depending on the height of the room, can overcome the thermal plume generated by a human subject with a moderate activity (100÷120W). The velocities from the local Ventilation System need to be higher with at least one step, in accordance with the distance from the Ventilation System to the operating wound, in order to avoid disturbances generated from the UAF System.
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Optimization process for an industrial Ventilation System installed inside a sludge dehydration hall
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: George Chitaru, Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Angel DogeanuAbstract:This paper briefly presents the optimization process for an industrial Ventilation System installed inside the sludge dehydration hall from a waste-water treatment plant. High ammonia (NH3) concentrations are usually found in such working spaces if the Ventilation System is not properly designed. CFD numerical simulations have been used to propose solutions for the current General Ventilation System. PIV measurements on a reduced scale experimental model were realized for the validation of the CFD model. The model was successfully validated using the length of the jet throw as similarity condition. The numerical results have shown a significant decrease in NH3 values after optimizing the General Ventilation System and the solution was implemented to the hall. However, it was concluded that a local exhaust method was still required to ensure better indoor air quality for the workers. A CFD analysis was ran once again to find a local exhaust method suitable for this particular environment.
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Interaction between a local and a General Ventilation System for an operating room with patient
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the airflow from a unidirectional airflow (UAF) System and a local Ventilation System will interact with each other. The airflow velocities used are within the usual ranges recommended by literature. The research was conducted by numerical and experimental studies. The numerical case represents an operating room (OR) with a UAF diffuser, a local Ventilation System, known as a mobile laminar airflow (MLAF) and outlet diffusers. The experimental campaigns were made to determine the thermal plume from a patient using Particle Image Velocimetry (PIV) and thermography (IR). From the thermal plume study, it has been noticed that velocities ≥0.2 m/s from the UAF can overcome the thermal plume generated by a human subject with a moderate activity. The studies reveal that velocities from the local Ventilation System need to be higher with at least 0.1 m/s, in order to avoid disturbances generated from the LAF System.
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General Ventilation System Optimization Study for Environment Improvement of Sludge Dewatering Area from a Wastewater Treatment Plant
Energy Procedia, 2017Co-Authors: Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Alexandru Vasilescu, Laurentiu TacutuAbstract:Abstract One of the most important facilities in Romania for the wastewater treatment is located near Bucharest. The paper focus on the final sludge dewatering line where the working environment has recently been deemed unsuitable for human exploitation due to different chemical compounds such as water vapour, hydrogen sulphide, ammonia and calcium oxide dust. To avoid problems, the company has to manage very careful the human activity with long breaks to protect their employees so they decided to change the Ventilation solution, and to find the strategy of optimal air distribution. Our study defines the optimal solution for the General Ventilation of the room for highly dehydrated sludge and for the improvement of technological parameters and working conditions. This solution obtained by means of numerical simulation Generally adapts the existing Ventilation System and prepares the implementation of local solutions to capture and treat the effluents of the treatment line. In order to propose a solution for the General Ventilation System, we performed numerical simulations using Computational Fluid Dynamics models. The numerical models were calibrated and validated with measured data obtained in different experimental campaigns in situ.
Ilinca Nastase - One of the best experts on this subject based on the ideXlab platform.
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Local and General Ventilation System for an operating room with surgeons and patient
E3S Web of Conferences, 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the air flow from a unidirectional air flow (UAF) System and a local Ventilation System will interact with each other. The study analyzes the air circulation near the operating table at different air flow velocities from both Systems. The air flow velocities correspond to the usual range of velocities recommended by norms and guidelines. The research was approached by numerical and experimental studies. The thermal plume of the occupants (patient and surgeon) were measured by Particle Image Velocimetry (PIV) and thermography (IR). The results of the measurements were compared with the results from the numerical case. A mesh independence study was carried out for the numerical case. The study showed that velocities ≥0.2 m/s from the UAF, depending on the height of the room, can overcome the thermal plume generated by a human subject with a moderate activity (100÷120W). The velocities from the local Ventilation System need to be higher with at least one step, in accordance with the distance from the Ventilation System to the operating wound, in order to avoid disturbances generated from the UAF System.
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Optimization process for an industrial Ventilation System installed inside a sludge dehydration hall
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: George Chitaru, Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Angel DogeanuAbstract:This paper briefly presents the optimization process for an industrial Ventilation System installed inside the sludge dehydration hall from a waste-water treatment plant. High ammonia (NH3) concentrations are usually found in such working spaces if the Ventilation System is not properly designed. CFD numerical simulations have been used to propose solutions for the current General Ventilation System. PIV measurements on a reduced scale experimental model were realized for the validation of the CFD model. The model was successfully validated using the length of the jet throw as similarity condition. The numerical results have shown a significant decrease in NH3 values after optimizing the General Ventilation System and the solution was implemented to the hall. However, it was concluded that a local exhaust method was still required to ensure better indoor air quality for the workers. A CFD analysis was ran once again to find a local exhaust method suitable for this particular environment.
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Interaction between a local and a General Ventilation System for an operating room with patient
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the airflow from a unidirectional airflow (UAF) System and a local Ventilation System will interact with each other. The airflow velocities used are within the usual ranges recommended by literature. The research was conducted by numerical and experimental studies. The numerical case represents an operating room (OR) with a UAF diffuser, a local Ventilation System, known as a mobile laminar airflow (MLAF) and outlet diffusers. The experimental campaigns were made to determine the thermal plume from a patient using Particle Image Velocimetry (PIV) and thermography (IR). From the thermal plume study, it has been noticed that velocities ≥0.2 m/s from the UAF can overcome the thermal plume generated by a human subject with a moderate activity. The studies reveal that velocities from the local Ventilation System need to be higher with at least 0.1 m/s, in order to avoid disturbances generated from the LAF System.
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Numerical Prediction of Carbon Dioxide Accumulation in the International Space Station Crew Quarters
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: Matei-razva Georgescu, Mihnea Sandu, Ilinca Nastase, Amina Meslem, Flori OdeAbstract:On the International Space Station, forced Ventilation is a necessity. In the absence of gravity, air movement due to density differences is nonexistent. This phenomenon leads to the risk of carbon dioxide accumulation in the breathing area, especially in confined spaces where the General Ventilation System of the space station is less effective. The crew quarters of the astronauts are the areas where they sleep and there have been reports that suggest higher carbon dioxide concentrations than normal. This study presents a numerical investigation of the carbon dioxide accumulation rate inside these crew quarters.
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General Ventilation System Optimization Study for Environment Improvement of Sludge Dewatering Area from a Wastewater Treatment Plant
Energy Procedia, 2017Co-Authors: Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Alexandru Vasilescu, Laurentiu TacutuAbstract:Abstract One of the most important facilities in Romania for the wastewater treatment is located near Bucharest. The paper focus on the final sludge dewatering line where the working environment has recently been deemed unsuitable for human exploitation due to different chemical compounds such as water vapour, hydrogen sulphide, ammonia and calcium oxide dust. To avoid problems, the company has to manage very careful the human activity with long breaks to protect their employees so they decided to change the Ventilation solution, and to find the strategy of optimal air distribution. Our study defines the optimal solution for the General Ventilation of the room for highly dehydrated sludge and for the improvement of technological parameters and working conditions. This solution obtained by means of numerical simulation Generally adapts the existing Ventilation System and prepares the implementation of local solutions to capture and treat the effluents of the treatment line. In order to propose a solution for the General Ventilation System, we performed numerical simulations using Computational Fluid Dynamics models. The numerical models were calibrated and validated with measured data obtained in different experimental campaigns in situ.
Florin Bode - One of the best experts on this subject based on the ideXlab platform.
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Local and General Ventilation System for an operating room with surgeons and patient
E3S Web of Conferences, 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the air flow from a unidirectional air flow (UAF) System and a local Ventilation System will interact with each other. The study analyzes the air circulation near the operating table at different air flow velocities from both Systems. The air flow velocities correspond to the usual range of velocities recommended by norms and guidelines. The research was approached by numerical and experimental studies. The thermal plume of the occupants (patient and surgeon) were measured by Particle Image Velocimetry (PIV) and thermography (IR). The results of the measurements were compared with the results from the numerical case. A mesh independence study was carried out for the numerical case. The study showed that velocities ≥0.2 m/s from the UAF, depending on the height of the room, can overcome the thermal plume generated by a human subject with a moderate activity (100÷120W). The velocities from the local Ventilation System need to be higher with at least one step, in accordance with the distance from the Ventilation System to the operating wound, in order to avoid disturbances generated from the UAF System.
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Optimization process for an industrial Ventilation System installed inside a sludge dehydration hall
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: George Chitaru, Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Angel DogeanuAbstract:This paper briefly presents the optimization process for an industrial Ventilation System installed inside the sludge dehydration hall from a waste-water treatment plant. High ammonia (NH3) concentrations are usually found in such working spaces if the Ventilation System is not properly designed. CFD numerical simulations have been used to propose solutions for the current General Ventilation System. PIV measurements on a reduced scale experimental model were realized for the validation of the CFD model. The model was successfully validated using the length of the jet throw as similarity condition. The numerical results have shown a significant decrease in NH3 values after optimizing the General Ventilation System and the solution was implemented to the hall. However, it was concluded that a local exhaust method was still required to ensure better indoor air quality for the workers. A CFD analysis was ran once again to find a local exhaust method suitable for this particular environment.
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Interaction between a local and a General Ventilation System for an operating room with patient
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: Laurentiu Tacutu, Florin Bode, Ilinca Nastase, Angel Dogeanu, Cristiana CroitoruAbstract:The aim of this study is to determine how the airflow from a unidirectional airflow (UAF) System and a local Ventilation System will interact with each other. The airflow velocities used are within the usual ranges recommended by literature. The research was conducted by numerical and experimental studies. The numerical case represents an operating room (OR) with a UAF diffuser, a local Ventilation System, known as a mobile laminar airflow (MLAF) and outlet diffusers. The experimental campaigns were made to determine the thermal plume from a patient using Particle Image Velocimetry (PIV) and thermography (IR). From the thermal plume study, it has been noticed that velocities ≥0.2 m/s from the UAF can overcome the thermal plume generated by a human subject with a moderate activity. The studies reveal that velocities from the local Ventilation System need to be higher with at least 0.1 m/s, in order to avoid disturbances generated from the LAF System.
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General Ventilation System Optimization Study for Environment Improvement of Sludge Dewatering Area from a Wastewater Treatment Plant
Energy Procedia, 2017Co-Authors: Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Alexandru Vasilescu, Laurentiu TacutuAbstract:Abstract One of the most important facilities in Romania for the wastewater treatment is located near Bucharest. The paper focus on the final sludge dewatering line where the working environment has recently been deemed unsuitable for human exploitation due to different chemical compounds such as water vapour, hydrogen sulphide, ammonia and calcium oxide dust. To avoid problems, the company has to manage very careful the human activity with long breaks to protect their employees so they decided to change the Ventilation solution, and to find the strategy of optimal air distribution. Our study defines the optimal solution for the General Ventilation of the room for highly dehydrated sludge and for the improvement of technological parameters and working conditions. This solution obtained by means of numerical simulation Generally adapts the existing Ventilation System and prepares the implementation of local solutions to capture and treat the effluents of the treatment line. In order to propose a solution for the General Ventilation System, we performed numerical simulations using Computational Fluid Dynamics models. The numerical models were calibrated and validated with measured data obtained in different experimental campaigns in situ.
Mihnea Sandu - One of the best experts on this subject based on the ideXlab platform.
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Optimization process for an industrial Ventilation System installed inside a sludge dehydration hall
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: George Chitaru, Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Angel DogeanuAbstract:This paper briefly presents the optimization process for an industrial Ventilation System installed inside the sludge dehydration hall from a waste-water treatment plant. High ammonia (NH3) concentrations are usually found in such working spaces if the Ventilation System is not properly designed. CFD numerical simulations have been used to propose solutions for the current General Ventilation System. PIV measurements on a reduced scale experimental model were realized for the validation of the CFD model. The model was successfully validated using the length of the jet throw as similarity condition. The numerical results have shown a significant decrease in NH3 values after optimizing the General Ventilation System and the solution was implemented to the hall. However, it was concluded that a local exhaust method was still required to ensure better indoor air quality for the workers. A CFD analysis was ran once again to find a local exhaust method suitable for this particular environment.
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Numerical Prediction of Carbon Dioxide Accumulation in the International Space Station Crew Quarters
2019 International Conference on ENERGY and ENVIRONMENT (CIEM), 2019Co-Authors: Matei-razva Georgescu, Mihnea Sandu, Ilinca Nastase, Amina Meslem, Flori OdeAbstract:On the International Space Station, forced Ventilation is a necessity. In the absence of gravity, air movement due to density differences is nonexistent. This phenomenon leads to the risk of carbon dioxide accumulation in the breathing area, especially in confined spaces where the General Ventilation System of the space station is less effective. The crew quarters of the astronauts are the areas where they sleep and there have been reports that suggest higher carbon dioxide concentrations than normal. This study presents a numerical investigation of the carbon dioxide accumulation rate inside these crew quarters.
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General Ventilation System Optimization Study for Environment Improvement of Sludge Dewatering Area from a Wastewater Treatment Plant
Energy Procedia, 2017Co-Authors: Cristiana Croitoru, Mihnea Sandu, Ilinca Nastase, Florin Bode, Alexandru Vasilescu, Laurentiu TacutuAbstract:Abstract One of the most important facilities in Romania for the wastewater treatment is located near Bucharest. The paper focus on the final sludge dewatering line where the working environment has recently been deemed unsuitable for human exploitation due to different chemical compounds such as water vapour, hydrogen sulphide, ammonia and calcium oxide dust. To avoid problems, the company has to manage very careful the human activity with long breaks to protect their employees so they decided to change the Ventilation solution, and to find the strategy of optimal air distribution. Our study defines the optimal solution for the General Ventilation of the room for highly dehydrated sludge and for the improvement of technological parameters and working conditions. This solution obtained by means of numerical simulation Generally adapts the existing Ventilation System and prepares the implementation of local solutions to capture and treat the effluents of the treatment line. In order to propose a solution for the General Ventilation System, we performed numerical simulations using Computational Fluid Dynamics models. The numerical models were calibrated and validated with measured data obtained in different experimental campaigns in situ.