Human development is inherently connected with availability of water and energy.Energy production requires water,whereas water treatment needs energy.On the other hand,microbial fuel cell has capability to produce ene...Human development is inherently connected with availability of water and energy.Energy production requires water,whereas water treatment needs energy.On the other hand,microbial fuel cell has capability to produce energy and water simultaneously from waste water or organic matter.In this paper,first principle-based model of variable volume microbial fuel cell is simulated.Hydraulic retention time is selected as the manipulated variable using the study of steady state and dynamic responses.Classical PI and model predictive control strategies are developed for controlling the produced power from the cell,and its performance is tested for servo problem.Settling time for positive and negative set points is found to be 126 and 889 h in case of classical PI and 120 and 750 h in case of linear MPC,respectively along with large increase(three times order of magnitude)in working volume for negative set point.These control challenges are overcome by using split range controller with variable and constant volume microbial fuel cells.The settling time for negative set point is found to be 49 and 21 h for classical PI and linear MPC schemes,respectively,which is significantly lower than using only variable volume microbial fuel cell.Also,there is no increase in the working volume of the constant volume microbial fuel cell.Hence,operating range of the microbial fuel cell is enhanced using split range controller.展开更多
In the paper, the parallel calculation method is used to solve the problem of incompressible viscous laminar flow in a cylindrical passage. The whole calculated area is divided into sub-ranges by the strip range split...In the paper, the parallel calculation method is used to solve the problem of incompressible viscous laminar flow in a cylindrical passage. The whole calculated area is divided into sub-ranges by the strip range split method with overlapping, and the momentum and pressure correction equations are solved respectively. For the pressure correction equation, the block correction method is used to quicken the convergence speed of linear algebraic equations.The calculation is carried out on micro-computer outfitting TRANSPUTER boards. The results show good parallel quickened ratio and parallel efficiency.展开更多
文摘Human development is inherently connected with availability of water and energy.Energy production requires water,whereas water treatment needs energy.On the other hand,microbial fuel cell has capability to produce energy and water simultaneously from waste water or organic matter.In this paper,first principle-based model of variable volume microbial fuel cell is simulated.Hydraulic retention time is selected as the manipulated variable using the study of steady state and dynamic responses.Classical PI and model predictive control strategies are developed for controlling the produced power from the cell,and its performance is tested for servo problem.Settling time for positive and negative set points is found to be 126 and 889 h in case of classical PI and 120 and 750 h in case of linear MPC,respectively along with large increase(three times order of magnitude)in working volume for negative set point.These control challenges are overcome by using split range controller with variable and constant volume microbial fuel cells.The settling time for negative set point is found to be 49 and 21 h for classical PI and linear MPC schemes,respectively,which is significantly lower than using only variable volume microbial fuel cell.Also,there is no increase in the working volume of the constant volume microbial fuel cell.Hence,operating range of the microbial fuel cell is enhanced using split range controller.
文摘In the paper, the parallel calculation method is used to solve the problem of incompressible viscous laminar flow in a cylindrical passage. The whole calculated area is divided into sub-ranges by the strip range split method with overlapping, and the momentum and pressure correction equations are solved respectively. For the pressure correction equation, the block correction method is used to quicken the convergence speed of linear algebraic equations.The calculation is carried out on micro-computer outfitting TRANSPUTER boards. The results show good parallel quickened ratio and parallel efficiency.
