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  1. Article: Sustainable utilization of waste tire-chips reinforced copper tailings as structural fill

    Gill, Gourav / Mittal, Ravi Kant / Dandautiya, Rahul / Purohit, Nilesh

    Environment, development and sustainability. 2020 June, v. 22, no. 5

    2020  

    Abstract: One of the major wastes from mining and automobile sectors is tailings and waste tires, respectively. Their voluminous nature calls for urgent action for safe disposal and to reduce the growing threat on the environment. Under the present study, ... ...

    Abstract One of the major wastes from mining and automobile sectors is tailings and waste tires, respectively. Their voluminous nature calls for urgent action for safe disposal and to reduce the growing threat on the environment. Under the present study, laboratory model footing and toxicity characteristics leaching procedure (TCLP) tests were conducted on tire chip-reinforced copper tailings (TRCT) to explore the feasibility of its use as structural fill and its potential impact on surroundings. Parameters considered for the laboratory study were tire chip quantity, relative density of copper tailings and depth of reinforced zone. The test results indicate that there is a significant enhancement in bearing capacity of copper tailing at all the studied strains by the addition of waste tires. Bearing capacity increased by more than nine times compared to unreinforced tailings when reinforced with 30% tire chips by weight. The TCLP tests conducted on copper tailings established that concentrations of the leached elements were well below the regulatory standards. Furthermore, a neural network model was trained via the experimental results of the tests to quickly predict the bearing capacity of TRCT for quick use in field applications. Therefore, the proposed technique can help in the effective waste management and safe disposals of large quantities of copper tailings as well as waste tires and also promoting sustainability in construction.
    Keywords automobiles ; copper ; density ; depth ; environment ; laboratories ; leaching ; mine tailings ; mining ; neural networks ; strains ; testing ; tires ; toxicity ; waste management ; weight
    Language English
    Dates of publication 2020-06
    Size p. 4845-4865.
    Publishing place Springer Netherlands
    Document type Article
    Note NAL-light
    ZDB-ID 1438730-x
    ISSN 1387-585X
    ISSN 1387-585X
    DOI 10.1007/s10668-019-00408-2
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Integrated supermarket refrigeration for very high ambient temperature

    Purohit, Nilesh / Vishaldeep Sharma / Samer Sawalha / Brian Fricke / Rodrigo Llopis / Mani Sankar Dasgupta

    Elsevier Ltd Energy. 2018 Dec. 15, v. 165

    2018  

    Abstract: This paper analytically investigates and compares the performance of a proposed ‘all-natural’ NH3/CO2 cascaded booster system to a conventional R404A direct expansion system as well as to an ‘all-CO2’ system with multi-ejector unit and flooded evaporator. ...

    Abstract This paper analytically investigates and compares the performance of a proposed ‘all-natural’ NH3/CO2 cascaded booster system to a conventional R404A direct expansion system as well as to an ‘all-CO2’ system with multi-ejector unit and flooded evaporator. Performance comparison is made based on the annual combined COP and Life Cycle Climate Performance (LCCP) for operation in selected cities of Middle East and India. Our results show that in extreme warm climate, the energy efficiency of the proposed configuration exceeds that of all-CO2 configuration by a maximum of about 12.23% and the total emissions are lower by up to 11.20%. However, the all-CO2 multi ejector system performs better in cold and mild warm climate. In the NH3/CO2 cascade, the high temperature NH3 system can be designed to be isolated from the accessible locations of the supermarket. The work presented is expected to help adoption of natural refrigerants such as CO2 and NH3 for commercial application in extreme warm climate conditions prevailing in many cities of Middle East and India.
    Keywords ambient temperature ; ammonia ; carbon dioxide ; cities ; climate ; emissions ; energy efficiency ; refrigeration ; supermarkets ; India ; Middle East
    Language English
    Dates of publication 2018-1215
    Size p. 572-590.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2019804-8
    ISSN 0360-5442 ; 0360-5442
    ISSN (online) 0360-5442
    ISSN 0360-5442
    DOI 10.1016/j.energy.2018.09.097
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Heat transfer and entropy generation analysis of alumina/water nanofluid in a flat plate PV/T collector under equal pumping power comparison criterion

    Purohit, Nilesh / Sanjeev Jakhar / Paride Gullo / Mani Sankar Dasgupta

    Renewable energy. 2018 May, v. 120

    2018  

    Abstract: Convective heat transfer of alumina/water nanofluid flow through flat plate PV/T panel in laminar flow has been investigated numerically in this study. Majority of previous studies, reported comparison in performance of nanofluid with that of basefluid, ... ...

    Abstract Convective heat transfer of alumina/water nanofluid flow through flat plate PV/T panel in laminar flow has been investigated numerically in this study. Majority of previous studies, reported comparison in performance of nanofluid with that of basefluid, based on equal Reynolds number criterion. Hence, there is limited exploration of other comparison bases. A novel and prominent comparison basis, besides conventional equal Reynolds number, is equal pumping power and appears more practically oriented. Nanofluid, having particle dimension of 20 nm and inlet temperature of 293 K, is loaded with 1%, 4% and 6% of particle volume fraction with Reynolds number varying from 300 to 1800. Simulation results indicate average 25.2% improvement in heat transfer coefficient for nanofluid under equal Reynolds number comparison basis. While, under equal pumping power comparison criterion, the heat transfer coefficient for nanofluid is found to have average decrement up to 13.8%. Entropy generation for nanofluid reduces significantly, maximum up to 31%, under equal Reynolds number comparison criterion only. Alumina/water nanofluid in flat plate PV/T channel is found beneficial only under equal Reynolds number comparison basis.
    Keywords Reynolds number ; aluminum oxide ; entropy ; heat transfer ; heat transfer coefficient ; laminar flow ; nanofluids ; renewable energy sources ; temperature
    Language English
    Dates of publication 2018-05
    Size p. 14-22.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2001449-1
    ISSN 0960-1481
    ISSN 0960-1481
    DOI 10.1016/j.renene.2017.12.066
    Database NAL-Catalogue (AGRICOLA)

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