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Pradeep K Singh - One of the best experts on this subject based on the ideXlab platform.

  • Kinetic Energy Recovery from the Chimney Flue Gases Using Ducted Turbine System
    Chinese Journal of Mechanical Engineering, 2017
    Co-Authors: Harjeet S Mann, Pradeep K Singh
    Abstract:

    An innovative idea of extracting kinetic Energy from man-made wind resources using ducted turbine system for on-site power generation is introduced in this paper. A horizontal axis ducted turbine is attached to the top of the chimney to harness the kinetic Energy of flue gases for producing electricity. The turbine system is positioned beyond the chimney outlet, to avoid any negative impact on the chimney performance. The convergent-divergent duct causes increase in the flue gas velocity and hence enhances the performance of the turbine. It also acts as a safety cover to the Energy Recovery system. The results from the CFD based simulation analysis indicate that significant power 34 kW can be harnessed from the chimney exhaust. The effect of airfoils NACA4412 and NACA4416 and the diffuser angle on the power extraction by the Energy Recovery system using a 6-bladed ducted turbine has been studied with the CFD simulation. It is observed that the average flue gas velocity in the duct section at the throat is approximately twice that of the inlet velocity, whereas maximum velocity achieved is 2.6 times the inlet velocity. The simulated results show that about power may be extracted from the chimney flue gases of 660 MW power plant. The system can be retrofitted to existing chimneys of thermal power plants, refineries and other industries.

  • conceptual development of an Energy Recovery from the chimney flue gases using ducted turbine system
    Journal of Natural Gas Science and Engineering, 2016
    Co-Authors: Harjeet S Mann, Pradeep K Singh
    Abstract:

    Abstract An innovative idea of extracting kinetic Energy from man-made wind resources (chimney flue gases) with ducted horizontal axis turbine system for producing electricity is introduced in this paper. The turbine system is positioned beyond the chimney outlet, to avoid any negative impact on the chimney performance. The duct acts as a safety cover for the Energy Recovery system and also enhances the performance of the system. The effect of airfoils NACA4412 and NACA4416 on the power extraction by the Energy Recovery system using a 6-bladed ducted turbine has been studied using CFD simulation. It is observed that the average flue gas velocity in the duct section at the throat is approximately twice that of the inlet velocity, whereas maximum throat velocity achieved is 2.6 times the inlet velocity. The results from the CFD (Computational Fluid Dynamics) based simulations analysis indicate that a significant power can be harnessed from the chimney exhaust. The system may be retrofitted to existing chimneys of thermal power plants, refineries and other industries. The market potential for this Energy Recovery system appears to be very high due to abundant chimneys, cooling towers and other man-made air/gaseous exhaust system present globally.

J G Pharoah - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of heat and Energy Recovery ventilators using exergy analysis and nonequilibrium thermodynamics
    Energy and Buildings, 2018
    Co-Authors: Magnus Aashammer Gjennestad, Eskil Aursand, Elisa Magnanelli, J G Pharoah
    Abstract:

    Abstract The increased attention to Energy savings has contributed to more widespread use of Energy Recovery systems for building ventilation. We investigate the efficiency of such systems under different outdoor conditions using exergy analysis and nonequilibrium thermodynamics. This analysis makes it possible to assess performance in terms of loss of work potential, to account for the different quality of Energy and to localize and compare the different sources of loss in the system. It also enables the use of exergy efficiency as a single performance parameter, in contrast to the several indicators that are commonly used. These more common indicators are difficult to compare and relate to each other. Further, since there is no obvious optimal trade-off between them, it is challenging to combine them and develop a global performance indicator that allows for a sensible comparison of different technical solutions and different types of Recovery devices. We illustrate the concepts by applying the analysis to a heat Recovery ventilator (HRV) and to a structurally similar membrane Energy Recovery ventilator (MERV) that can exchange both heat and moisture. We show how the exergy efficiency can be used to identify the range of operating conditions for which the Recovery ventilator is not beneficial as the Energy cost is greater than the Energy Recovery. This is not trivial using traditional performance parameters, yet it is a natural outcome of exergy analysis. In addition, we identify the mechanism by which work potential is lost, which can help the eventual optimization of both the Recovery process and the auxiliary systems present in ventilation systems.

Harjeet S Mann - One of the best experts on this subject based on the ideXlab platform.

  • Kinetic Energy Recovery from the Chimney Flue Gases Using Ducted Turbine System
    Chinese Journal of Mechanical Engineering, 2017
    Co-Authors: Harjeet S Mann, Pradeep K Singh
    Abstract:

    An innovative idea of extracting kinetic Energy from man-made wind resources using ducted turbine system for on-site power generation is introduced in this paper. A horizontal axis ducted turbine is attached to the top of the chimney to harness the kinetic Energy of flue gases for producing electricity. The turbine system is positioned beyond the chimney outlet, to avoid any negative impact on the chimney performance. The convergent-divergent duct causes increase in the flue gas velocity and hence enhances the performance of the turbine. It also acts as a safety cover to the Energy Recovery system. The results from the CFD based simulation analysis indicate that significant power 34 kW can be harnessed from the chimney exhaust. The effect of airfoils NACA4412 and NACA4416 and the diffuser angle on the power extraction by the Energy Recovery system using a 6-bladed ducted turbine has been studied with the CFD simulation. It is observed that the average flue gas velocity in the duct section at the throat is approximately twice that of the inlet velocity, whereas maximum velocity achieved is 2.6 times the inlet velocity. The simulated results show that about power may be extracted from the chimney flue gases of 660 MW power plant. The system can be retrofitted to existing chimneys of thermal power plants, refineries and other industries.

  • conceptual development of an Energy Recovery from the chimney flue gases using ducted turbine system
    Journal of Natural Gas Science and Engineering, 2016
    Co-Authors: Harjeet S Mann, Pradeep K Singh
    Abstract:

    Abstract An innovative idea of extracting kinetic Energy from man-made wind resources (chimney flue gases) with ducted horizontal axis turbine system for producing electricity is introduced in this paper. The turbine system is positioned beyond the chimney outlet, to avoid any negative impact on the chimney performance. The duct acts as a safety cover for the Energy Recovery system and also enhances the performance of the system. The effect of airfoils NACA4412 and NACA4416 on the power extraction by the Energy Recovery system using a 6-bladed ducted turbine has been studied using CFD simulation. It is observed that the average flue gas velocity in the duct section at the throat is approximately twice that of the inlet velocity, whereas maximum throat velocity achieved is 2.6 times the inlet velocity. The results from the CFD (Computational Fluid Dynamics) based simulations analysis indicate that a significant power can be harnessed from the chimney exhaust. The system may be retrofitted to existing chimneys of thermal power plants, refineries and other industries. The market potential for this Energy Recovery system appears to be very high due to abundant chimneys, cooling towers and other man-made air/gaseous exhaust system present globally.

Matan Adato - One of the best experts on this subject based on the ideXlab platform.

  • Energy Recovery consideration in brackish water desalination
    Desalination, 2014
    Co-Authors: Alexander Drak, Matan Adato
    Abstract:

    Abstract In brackish water RO desalination, the low feed water TDS and relatively low brine flow make the use of Energy Recovery devices ambiguous. The decision to implement Energy Recovery device must always be based on the Life Cycle Cost estimation of the plant. Design considerations concerning the Energy Recovery device selection and field experience in Lahat brackish water desalination plant (40,000 m3/day) are presented in this article. Two types of Energy Recovery device are generally considered in the brackish water RO desalination, turbocharger and isobaric Energy Recovery devices. Taking into consideration the simplicity of the turbocharger, it was selected for the 1st phase of the Lahat brackish water desalination plant with the design Recovery range of 80%–88%. The turbocharger was designed for max Recovery and external bypass line was added to operate the plant at low recoveries. For such wide Recovery range the turbocharger entire efficiency range of 30%–40% was achieved. Due to the limitation of the turbocharger to operate efficiently at the broad Recovery range and Life Cycle Cost benefits of isobaric Energy Recovery device, the isobaric Energy Recovery device was selected for the 2nd phase of the Lahat brackish water desalination plant.

Magnus Aashammer Gjennestad - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of heat and Energy Recovery ventilators using exergy analysis and nonequilibrium thermodynamics
    Energy and Buildings, 2018
    Co-Authors: Magnus Aashammer Gjennestad, Eskil Aursand, Elisa Magnanelli, J G Pharoah
    Abstract:

    Abstract The increased attention to Energy savings has contributed to more widespread use of Energy Recovery systems for building ventilation. We investigate the efficiency of such systems under different outdoor conditions using exergy analysis and nonequilibrium thermodynamics. This analysis makes it possible to assess performance in terms of loss of work potential, to account for the different quality of Energy and to localize and compare the different sources of loss in the system. It also enables the use of exergy efficiency as a single performance parameter, in contrast to the several indicators that are commonly used. These more common indicators are difficult to compare and relate to each other. Further, since there is no obvious optimal trade-off between them, it is challenging to combine them and develop a global performance indicator that allows for a sensible comparison of different technical solutions and different types of Recovery devices. We illustrate the concepts by applying the analysis to a heat Recovery ventilator (HRV) and to a structurally similar membrane Energy Recovery ventilator (MERV) that can exchange both heat and moisture. We show how the exergy efficiency can be used to identify the range of operating conditions for which the Recovery ventilator is not beneficial as the Energy cost is greater than the Energy Recovery. This is not trivial using traditional performance parameters, yet it is a natural outcome of exergy analysis. In addition, we identify the mechanism by which work potential is lost, which can help the eventual optimization of both the Recovery process and the auxiliary systems present in ventilation systems.

  • Performance analysis of heat and Energy Recovery ventilators using exergy analysis and nonequilibrium thermodynamics
    'Elsevier BV', 2018
    Co-Authors: Magnus Aashammer Gjennestad, Aursand Eskil, Magnanelli Elisa, Pharoah Jon
    Abstract:

    The increased attention to Energy savings has contributed to more widespread use of Energy Recovery systems for building ventilation. We investigate the efficiency of such systems under different outdoor conditions using exergy analysis and nonequilibrium thermodynamics. This analysis makes it possible to assess performance in terms of loss of work potential, to account for the different quality of Energy and to localize and compare the different sources of loss in the system. It also enables the use of exergy efficiency as a single performance parameter, in contrast to the several indicators that are commonly used. These more common indicators are difficult to compare and relate to each other. Further, since there is no obvious optimal trade-off between them, it is challenging to combine them and develop a global performance indicator that allows for a sensible comparison of different technical solutions and different types of Recovery devices. We illustrate the concepts by applying the analysis to a heat Recovery ventilator (HRV) and to a structurally similar membrane Energy Recovery ventilator (MERV) that can exchange both heat and moisture. We show how the exergy efficiency can be used to identify the range of operating conditions for which the Recovery ventilator is not beneficial as the Energy cost is greater than the Energy Recovery. This is not trivial using traditional performance parameters, yet it is a natural outcome of exergy analysis. In addition, we identify the mechanism by which work potential is lost, which can help the eventual optimization of both the Recovery process and the auxiliary systems present in ventilation systems.Comment: 27 pages, 9 figure