The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Adrian Bejan - One of the best experts on this subject based on the ideXlab platform.

  • thermodynamic optimization of heat transfer equipment configuration in an Environmental Control System
    International Journal of Energy Research, 2001
    Co-Authors: Amin Alebrahim, Adrian Bejan
    Abstract:

    In this paper, we show that many features of a heat transfer installation can be deduced from the maximization of the global performance of the greater System that employs the installation. The heat transfer installation is a series of two cross-flow heat exchangers. The greater System is the Environmental Control System (ECS) of an aircraft. The global performance objective is the minimization of the total thermodynamic irreversibility of the ECS. Several architectural features are deduced from principle: the relative position of the two heat exchangers, their relative sizes, and all the geometric aspect ratios of the two heat exchanger cores. We find that the optimized architecture is insensitive (robust) to changes in some of the external parameters. Robustness is a useful feature because it simplifies the design work. Furthermore, one design that is built can be expected to function at near-optimal levels when the external parameters change. The application of this method of topology optimization to more complex Systems is discussed. Copyright © 2001 John Wiley & Sons, Ltd.

  • Thermodynamic optimization of heat‐transfer equipment configuration in an Environmental Control System
    International Journal of Energy Research, 2001
    Co-Authors: Amin Alebrahim, Adrian Bejan
    Abstract:

    In this paper, we show that many features of a heat transfer installation can be deduced from the maximization of the global performance of the greater System that employs the installation. The heat transfer installation is a series of two cross-flow heat exchangers. The greater System is the Environmental Control System (ECS) of an aircraft. The global performance objective is the minimization of the total thermodynamic irreversibility of the ECS. Several architectural features are deduced from principle: the relative position of the two heat exchangers, their relative sizes, and all the geometric aspect ratios of the two heat exchanger cores. We find that the optimized architecture is insensitive (robust) to changes in some of the external parameters. Robustness is a useful feature because it simplifies the design work. Furthermore, one design that is built can be expected to function at near-optimal levels when the external parameters change. The application of this method of topology optimization to more complex Systems is discussed. Copyright © 2001 John Wiley & Sons, Ltd.

  • Integrative thermodynamic optimization of the Environmental Control System of an aircraft
    International Journal of Heat and Mass Transfer, 2001
    Co-Authors: Jose V. C. Vargas, Adrian Bejan
    Abstract:

    Abstract In this paper we propose to optimize the geometric configuration of a component by maximizing the global thermodynamic performance of the much larger System that contains the component. This “integrative” approach departs from current thermodynamic optimization practice in which the configuration of a component (e.g., heat exchanger) is optimized by itself, in isolation. In the present example the larger System is an aircraft and the component is its Environmental Control System (ECS). We show that the configuration of the ECS impacts the performance (exergy destruction, fuel consumption) of the aircraft in two ways, not one: through its own irreversibility, and its weight-related contribution to the power required to sustain the flight. By minimizing the thermodynamic losses at the aircraft level, we deduce all the geometric details of the cross-flow heat exchanger that dominates the weight and structure of the ECS. The optimized geometry is robust with respect to changes in some of the operating parameters that have to be specified. The integrative method illustrated in this paper is generally applicable to the optimization of architecture in other Systems where all the functions are driven by the exergy of the fuel installed onboard.

Wenpor Wang - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation for optimizing the design of subway Environmental Control System
    Building and Environment, 2002
    Co-Authors: Tsungche Cheng, Wenpor Wang
    Abstract:

    Subway Environmental Simulation Program (SES) was used to combine with the commercial computational fluid dynamics (CFD) software to explore the influence of various operating situations to the subway environment of Taipei Rapid Transit System in the present study. The results show that the under platform exhaust (UPE) has a substantial influence on the temperature and the cross-sectional area of the ventilation shaft has quite more effect on the ventilation volume than length. The pressure distribution caused by the piston effect and its effect on the platform screen door was also discussed and compared.

Amin Alebrahim - One of the best experts on this subject based on the ideXlab platform.

  • thermodynamic optimization of heat transfer equipment configuration in an Environmental Control System
    International Journal of Energy Research, 2001
    Co-Authors: Amin Alebrahim, Adrian Bejan
    Abstract:

    In this paper, we show that many features of a heat transfer installation can be deduced from the maximization of the global performance of the greater System that employs the installation. The heat transfer installation is a series of two cross-flow heat exchangers. The greater System is the Environmental Control System (ECS) of an aircraft. The global performance objective is the minimization of the total thermodynamic irreversibility of the ECS. Several architectural features are deduced from principle: the relative position of the two heat exchangers, their relative sizes, and all the geometric aspect ratios of the two heat exchanger cores. We find that the optimized architecture is insensitive (robust) to changes in some of the external parameters. Robustness is a useful feature because it simplifies the design work. Furthermore, one design that is built can be expected to function at near-optimal levels when the external parameters change. The application of this method of topology optimization to more complex Systems is discussed. Copyright © 2001 John Wiley & Sons, Ltd.

  • Thermodynamic optimization of heat‐transfer equipment configuration in an Environmental Control System
    International Journal of Energy Research, 2001
    Co-Authors: Amin Alebrahim, Adrian Bejan
    Abstract:

    In this paper, we show that many features of a heat transfer installation can be deduced from the maximization of the global performance of the greater System that employs the installation. The heat transfer installation is a series of two cross-flow heat exchangers. The greater System is the Environmental Control System (ECS) of an aircraft. The global performance objective is the minimization of the total thermodynamic irreversibility of the ECS. Several architectural features are deduced from principle: the relative position of the two heat exchangers, their relative sizes, and all the geometric aspect ratios of the two heat exchanger cores. We find that the optimized architecture is insensitive (robust) to changes in some of the external parameters. Robustness is a useful feature because it simplifies the design work. Furthermore, one design that is built can be expected to function at near-optimal levels when the external parameters change. The application of this method of topology optimization to more complex Systems is discussed. Copyright © 2001 John Wiley & Sons, Ltd.

Tsungche Cheng - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation for optimizing the design of subway Environmental Control System
    Building and Environment, 2002
    Co-Authors: Tsungche Cheng, Wenpor Wang
    Abstract:

    Subway Environmental Simulation Program (SES) was used to combine with the commercial computational fluid dynamics (CFD) software to explore the influence of various operating situations to the subway environment of Taipei Rapid Transit System in the present study. The results show that the under platform exhaust (UPE) has a substantial influence on the temperature and the cross-sectional area of the ventilation shaft has quite more effect on the ventilation volume than length. The pressure distribution caused by the piston effect and its effect on the platform screen door was also discussed and compared.

Zhang Yazhuo - One of the best experts on this subject based on the ideXlab platform.

  • Energy performance investigation of an innovative Environmental Control System in subway station
    Building and Environment, 2017
    Co-Authors: Huan Zhang, Cui Tong, Liu Minzhang, Wandong Zheng, Zhu Chunguang, Shijun You, Zhang Yazhuo
    Abstract:

    Abstract More than 70% of the non-traction energy consumption is attributable to Environmental Control System in subway stations, in which ventilation System accounts for the largest portion. Energy savings will be affected significantly if the Environmental Control System can be improved effectively. This paper proposed an innovative environment Control System. The System features an innovative platform door with Controllable vents, aiming to improve the energy performance and thermal environment in subway station. This study used on-site experimental data and numerical simulations to analyze the thermal environment of the station for optimizing the Controllable vents of innovative platform doors including position, size and open angle. Moreover, the operation Control strategy for the innovative Environmental Control System was put forward. The energy performance of the innovative Environmental Control System was discussed for the five cities, which represent five climate zones of China. The results showed the innovative Environmental Control System could satisfy the requirements of thermal comfort. Compared with the traditional platform screen doors System, the energy consumption could be reduced by 20.64%–60.43%.