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  1. Article ; Online: Capacity optimization of pumped storage hydropower and its impact on an integrated conventional hydropower plant operation

    Nasir, Jehanzeb / Javed, Adeel / Ali, Majid / Ullah, Kafait / Kazmi, Syed Ali Abbas

    Applied Energy. 2022 Oct., v. 323 p.119561-

    2022  

    Abstract: The energy sector contributes to around 60% of total greenhouse gas emissions. To limit climate change, the world is going through an energy transition to clean and affordable energy, therefore the share of variable renewable energy is increasing day by ... ...

    Abstract The energy sector contributes to around 60% of total greenhouse gas emissions. To limit climate change, the world is going through an energy transition to clean and affordable energy, therefore the share of variable renewable energy is increasing day by day. Power systems require significant flexibility to operate reliably. Pumped storage hydropower allows load balancing and stable integration of intermittent renewable energy in the electrical grid. All energy storage technologies, including pumped storage hydropower, are considered a net negative contributor to the grid since they draw more energy than they deliver. This paper uniquely investigates the true potential of pumped storage hydropower and its optimum operation along with existing conventional hydropower. It considers power, energy production, and utilization for both installations to determine an equilibrium condition for a net positive energy balance. The case study of the 300 MW Balakot conventional hydropower plant in Khyber Pakhtunkhwa, Pakistan indicates that the pumped storage hydropower sites, where additional water streams reach the upper storage reservoir, can reduce pumping energy consumption by up to 166 GWh/year. Accordingly, a pumped storage hydropower facility is proposed at Paras, Pakistan, modeled, and optimized in an integrated manner with the Balakot conventional hydropower plant for a net positive annual energy generation and profitability. The integrated power and energy modeling and capacity optimization of the hydropower complex highlight the importance of suitable site selection for pumped storage hydropower near existing conventional hydropower reservoirs. Value-added contribution of this configuration is that it can enhance annual energy generation from integrated conventional hydropower, reduce the upfront capital cost of the project by 10–15%, squeeze the project implementation schedule and result in a smaller carbon footprint to meet the ultimate objective of limiting climate change. Additionally, it unlocks huge untapped pumped storage hydropower potential besides existing conventional hydropower. Furthermore, the study guides the scientific and engineering organizations on optimum capacity utilization without impeding energy generation from conventional hydropower facilities.
    Keywords capital costs ; carbon footprint ; case studies ; climate change ; energy balance ; energy industry ; greenhouse gases ; profitability ; value added ; water power ; Pakistan ; Energy storage ; Pumped storage hydropower ; Conventional hydropower plant ; Energy modeling ; Capacity optimization
    Language English
    Dates of publication 2022-10
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 2000772-3
    ISSN 0306-2619
    ISSN 0306-2619
    DOI 10.1016/j.apenergy.2022.119561
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Multiparametric optimization of a reheated organic Rankine cycle for waste heat recovery based repowering of a degraded combined cycle gas turbine power plant

    Reshaeel, Muhammad / Javed, Adeel / Jamil, Ahmad / Ali, Majid / Mahmood, Mariam / Waqas, Adeel

    Energy conversion and management. 2022 Feb. 15, v. 254

    2022  

    Abstract: The study has conducted multiparametric optimization of a newly modified double stage reheated organic Rankine cycle configuration for the objective function of specific work output and its comparison with other conventional configurations of the organic ...

    Abstract The study has conducted multiparametric optimization of a newly modified double stage reheated organic Rankine cycle configuration for the objective function of specific work output and its comparison with other conventional configurations of the organic Rankine cycle for the waste heat recovery-based repowering of a degraded combined cycle gas turbine power plant using R245fa, R113, and R141b as the working fluids. Thermodynamic performance of the triple cycle formed by integrating each organic Rankine cycle configuration with the combined cycle gas turbine unit is assessed in terms of repowering, specific fuel consumption and specific water consumption along with the associated greenhouse gas emissions. 24-hour performance variation of the combined cycle gas turbine unit has been incorporated in the analysis. It is found that the double stage reheated organic Rankine cycle configuration has outperformed other configurations in terms of thermodynamic performance. Triple cycle for the double stage reheated organic Rankine cycle has resulted in an average of 1.37% increase in net power output for the working fluid R141b, equivalent to 5.10 MW of additional power output. The thermal efficiency of the triple cycle for double stage reheated organic Rankine cycle has increased by 1.40%, whereas the specific fuel consumption and specific water consumption have reduced by 1.28% and 3.35%, respectively using R141b as the working fluid. The highest waste heat recovery potential is exhibited by the integrated basic organic Rankine cycle configuration for the working fluid R245fa, recovering 30,840 kW of waste heat, equivalent to the burning of 2467.2 kg/hr of CH₄ and 6784.7 kg/hr CO₂ emissions.
    Keywords administrative management ; carbon dioxide ; energy conversion ; energy use and consumption ; greenhouse gases ; power plants ; waste heat recovery
    Language English
    Dates of publication 2022-0215
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2022.115237
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  3. Article: Optimization of a wind farm by coupled actuator disk and mesoscale models to mitigate neighboring wind farm wake interference from repowering perspective

    Khan, Mehtab Ahmad / Javed, Adeel / Shakir, Sehar / Syed, Abdul Haseeb

    Applied energy. 2021 Sept. 15, v. 298

    2021  

    Abstract: This study explores the effects of inter-farm wakes and proposes staggering schemes that are most suitable for optimization of existing wind farm arrays to mitigate the effects of compound wakes. The case study considers a total of 9 out of 33 most ... ...

    Abstract This study explores the effects of inter-farm wakes and proposes staggering schemes that are most suitable for optimization of existing wind farm arrays to mitigate the effects of compound wakes. The case study considers a total of 9 out of 33 most deteriorated wind turbine for a microscale numerical analysis using the steady-state actuator disk model coupled with the mesoscale boundary condition data. Furthermore, the convective atmospheric boundary layer has also been considered. For vertically staggered layouts, the effect of the inter-farm wakes appeared mild at 100 m, modest at 80 m, and high at 60 m; as the maximum velocity deficit observed under the influence of compound wakes is approximately 13.3%, 14.1%, and 15.2%, respectively. Onsite recorded power data has been used to validate the baseline predicted powers at 80 m hub height. Both vertical and horizontal staggering options have been assessed for partial repowering. By elevating the turbines to a 100 m hub height, the cumulative power generation from the 9 × turbines increased by approximately 13.5% while reducing the hub height to 60 m decreased the power output by approximately 11.5% of that of the baseline at 80 m hub height. Further increase in cumulative power of up to 23% compared to existing layout is achieved by applying a lateral repositioning of 3 × underperforming turbines now positioned at 100 m hub height. This paper hence presents an applied insight for partial repowering of onshore wind farms affected by inter-farm wakes.
    Keywords case studies ; energy ; models ; power generation ; troposphere ; wind ; wind farms ; wind turbines
    Language English
    Dates of publication 2021-0915
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000772-3
    ISSN 0306-2619
    ISSN 0306-2619
    DOI 10.1016/j.apenergy.2021.117229
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  4. Article: Multiparametric optimization for reduced condenser cooling water consumption in a degraded combined cycle gas turbine power plant from a water-energy nexus perspective

    Jamil, Ahmad / Javed, Adeel / Wajid, Abdul / Zeb, Muhammad Omar / Ali, Majid / Khoja, Asif Hussain / Imran, Muhammad

    Applied energy. 2021 Dec. 15, v. 304

    2021  

    Abstract: The Water-Energy Nexus is gaining considerable interest with growing environmental concerns, especially in developing countries such as Pakistan that are now under a state of water stress. Thermal power plants consume large amounts of freshwater, thereby ...

    Abstract The Water-Energy Nexus is gaining considerable interest with growing environmental concerns, especially in developing countries such as Pakistan that are now under a state of water stress. Thermal power plants consume large amounts of freshwater, thereby making their water usage optimization immensely important. For potential repowering featuring reduced cooling water consumption, a clear understanding of the influence of key condenser parameters on the power plant is required. This study investigates a degraded combined cycle gas turbine power plant for reduced cooling water usage from a repowering perspective. The degraded power plant under consideration draws 13% more freshwater for recirculation-based cooling from a canal linked with the River Indus in Pakistan. The power plant has been modeled using 120 h of real-time probabilistic data at baseload by generating three study cases stemming from 24-hour parametric variations. The commercial tool Cycle-Tempo has been deployed for modeling and simulating the power plant performance with the incorporation of physical uncertainties and errors originating from the measurement sensors. The model is validated and compared with the 23 years old design case data to highlight the degradations via an exergy analysis. A tri-parametric optimization is later performed to reduce the cooling water consumption through specialized performance maps that relate exergy, low-pressure section steam turbine performance, and condenser performance to highlight potential repowering opportunities while retaining the baseload performance. The optimized cases result in approximately 9.5–11.0% lesser water consumption in terms of mass flow rate while retaining the baseload performance and key heat recovery steam generator operating points.
    Keywords cooling ; exergy ; freshwater ; generators (equipment) ; heat recovery ; mass flow ; models ; power plants ; rivers ; turbines ; water stress ; water utilization ; Pakistan
    Language English
    Dates of publication 2021-1215
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000772-3
    ISSN 0306-2619
    ISSN 0306-2619
    DOI 10.1016/j.apenergy.2021.117764
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Effect of Different Activation Processes on CaO/Fly Ash Mixture for CO2 Capture

    Nawar, Azra / Ali, Majid / Waqas, Adeel / Javed, Adeel / Iqbal, Naseem / Khan, Rashid

    Energy & fuels. 2019 Dec. 24, v. 34, no. 2

    2019  

    Abstract: CO2 capture at high temperature through calcium looping is a capable technology for the implementation of carbon capture and storage. The major drawback of this process is the rapid deactivation of calcium-based sorbent due to sintering and attrition. To ...

    Abstract CO2 capture at high temperature through calcium looping is a capable technology for the implementation of carbon capture and storage. The major drawback of this process is the rapid deactivation of calcium-based sorbent due to sintering and attrition. To reduce these drawbacks, an environmentally friendly and low-cost approach is highly appreciated by researchers. Efforts were made to introduce a cost-effective and eco-friendly method to reduce sintering and enhance capacity by adding fly ash from coal-fired plants, into Ca-based sorbents with acetic acid through sonochemical and ball milling methods. Four different methods of mixing were used, i.e., dry, wet, sonochemical, and ball milling methods. The sorbents were characterized by SEM-EDS, XRD, TGA, and XRF. Hydration under acidic conditions with Ca-based sorbent using fly ash showed improved capacity and stability rather than under basic conditions. The sonochemical method achieved the highest CaO conversion of 100% in the first two cycles followed by the ball milling method with 99.8% also maintaining stability through the cycles as compared to other methods. The ball milling method achieved higher improvement to not only proper mixing of fly ash and CaO but also a reduction in sizes improved conversion and stability, and thus it can be considered as a green technology for scaled-up CO2 capture.
    Keywords X-ray diffraction ; X-ray fluorescence spectroscopy ; acetic acid ; calcium ; calcium oxide ; carbon dioxide ; carbon sequestration ; coal ; cost effectiveness ; energy-dispersive X-ray analysis ; fly ash ; milling ; mixing ; scanning electron microscopy ; sorbents ; sustainable technology ; temperature ; thermogravimetry
    Language English
    Dates of publication 2019-1224
    Size p. 2035-2044.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1483539-3
    ISSN 1520-5029 ; 0887-0624
    ISSN (online) 1520-5029
    ISSN 0887-0624
    DOI 10.1021/acs.energyfuels.9b03520
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  6. Article ; Online: Security of Information and Networks.

    Ahmad, Iftikhar / Rahim, Aneel / Javed, Adeel / Malik, Hafiz

    TheScientificWorldJournal

    2015  Volume 2015, Page(s) 150640

    Language English
    Publishing date 2015
    Publishing country United States
    Document type Editorial ; Introductory Journal Article
    ISSN 1537-744X
    ISSN (online) 1537-744X
    DOI 10.1155/2015/150640
    Database MEDical Literature Analysis and Retrieval System OnLINE

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