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Alessandro Valenti - One of the best experts on this subject based on the ideXlab platform.

  • experimental evidence of the thermal effect of lubricating oil sprayed in sliding vane air compressors
    Case Studies in Thermal Engineering, 2014
    Co-Authors: Gianluca Valenti, Stefano Murgia, Giulio Contaldi, Alessandro Valenti
    Abstract:

    Abstract A way to increase the efficiency of positive-displacement air compressor is spraying the lube oil to exploit it not only as lubricating and sealing agent but also as thermal ballast. This work seeks the experimental evidence in sliding-vane compressors by measuring the air standard volume flow rate and the electrical power input of three diverse configurations. The first configuration, taken as the reference, employs a conventional injection system comprising calibrated straight orifices. The other two, referred to as advanced, adopt smaller orifices and pressure-swirl full-cone nozzles designed for the purpose; the third configuration utilizes a pump to boost the oil pressure. The laser imagining technique shows that the nozzles generate sprays that break-up within a short distance into spherical droplets, ligaments, ramifications and undefined structures. Tests on the packaged compressors reveal that the advanced configurations provide almost the same air flow rate while utilizing half of the oil because the sprays generate a good sealing. Moreover, the sprayed oil is acting as a thermal ballast because the electrical input is reduced by 3.5% and 3.0%, respectively, if the pump is present or not , while the Specific Energy Requirement, accounting for the slightly reduced air flow, by 2.4% and 2.9%, respectively.

  • Experimental evidence of the thermal effect of lubricating oil sprayed in sliding-vane air compressors
    'Elsevier BV', 2014
    Co-Authors: Valenti Gianluca, Stefano Murgia, Giulio Contaldi, Alessandro Valenti
    Abstract:

    A way to increase the efficiency of positive-displacement air compressor is spraying the lube oil to exploit it not only as lubricating and sealing agent but also as thermal ballast. This work seeks the experimental evidence in sliding-vane compressors by measuring the air standard volume flow rate and the electrical power input of three diverse configurations. The first configuration, taken as reference, employs a conventional injection system comprising calibrated straight orifices. The other two, referred to as advanced, adopt smaller orifices and pressure-swirl full-cone nozzles designed for the purpose; the third configuration utilizes a pump to boost the oil pressure. The laser imagining technique shows that the nozzles generate sprays that break-up within a short distance into spherical droplets, ligaments, ramifications and undefined structures. Tests on the packaged compressors reveal that the advanced configurations provide almost the same air flow rate while utilizing half of the oil because the sprays generate a good sealing. Moreover, the sprayed oil is acting as a thermal ballast because the electrical input is reduced by 3.0% and 3.5%, respectively, if the pump is not or is present, while the Specific Energy Requirement, accounting for the slightly reduced air flow, by 2.4% and 2.9%, respectively

Gianluca Valenti - One of the best experts on this subject based on the ideXlab platform.

  • experimental evidence of the thermal effect of lubricating oil sprayed in sliding vane air compressors
    Case Studies in Thermal Engineering, 2014
    Co-Authors: Gianluca Valenti, Stefano Murgia, Giulio Contaldi, Alessandro Valenti
    Abstract:

    Abstract A way to increase the efficiency of positive-displacement air compressor is spraying the lube oil to exploit it not only as lubricating and sealing agent but also as thermal ballast. This work seeks the experimental evidence in sliding-vane compressors by measuring the air standard volume flow rate and the electrical power input of three diverse configurations. The first configuration, taken as the reference, employs a conventional injection system comprising calibrated straight orifices. The other two, referred to as advanced, adopt smaller orifices and pressure-swirl full-cone nozzles designed for the purpose; the third configuration utilizes a pump to boost the oil pressure. The laser imagining technique shows that the nozzles generate sprays that break-up within a short distance into spherical droplets, ligaments, ramifications and undefined structures. Tests on the packaged compressors reveal that the advanced configurations provide almost the same air flow rate while utilizing half of the oil because the sprays generate a good sealing. Moreover, the sprayed oil is acting as a thermal ballast because the electrical input is reduced by 3.5% and 3.0%, respectively, if the pump is present or not , while the Specific Energy Requirement, accounting for the slightly reduced air flow, by 2.4% and 2.9%, respectively.

Stefano Murgia - One of the best experts on this subject based on the ideXlab platform.

  • experimental evidence of the thermal effect of lubricating oil sprayed in sliding vane air compressors
    Case Studies in Thermal Engineering, 2014
    Co-Authors: Gianluca Valenti, Stefano Murgia, Giulio Contaldi, Alessandro Valenti
    Abstract:

    Abstract A way to increase the efficiency of positive-displacement air compressor is spraying the lube oil to exploit it not only as lubricating and sealing agent but also as thermal ballast. This work seeks the experimental evidence in sliding-vane compressors by measuring the air standard volume flow rate and the electrical power input of three diverse configurations. The first configuration, taken as the reference, employs a conventional injection system comprising calibrated straight orifices. The other two, referred to as advanced, adopt smaller orifices and pressure-swirl full-cone nozzles designed for the purpose; the third configuration utilizes a pump to boost the oil pressure. The laser imagining technique shows that the nozzles generate sprays that break-up within a short distance into spherical droplets, ligaments, ramifications and undefined structures. Tests on the packaged compressors reveal that the advanced configurations provide almost the same air flow rate while utilizing half of the oil because the sprays generate a good sealing. Moreover, the sprayed oil is acting as a thermal ballast because the electrical input is reduced by 3.5% and 3.0%, respectively, if the pump is present or not , while the Specific Energy Requirement, accounting for the slightly reduced air flow, by 2.4% and 2.9%, respectively.

  • Experimental evidence of the thermal effect of lubricating oil sprayed in sliding-vane air compressors
    'Elsevier BV', 2014
    Co-Authors: Valenti Gianluca, Stefano Murgia, Giulio Contaldi, Alessandro Valenti
    Abstract:

    A way to increase the efficiency of positive-displacement air compressor is spraying the lube oil to exploit it not only as lubricating and sealing agent but also as thermal ballast. This work seeks the experimental evidence in sliding-vane compressors by measuring the air standard volume flow rate and the electrical power input of three diverse configurations. The first configuration, taken as reference, employs a conventional injection system comprising calibrated straight orifices. The other two, referred to as advanced, adopt smaller orifices and pressure-swirl full-cone nozzles designed for the purpose; the third configuration utilizes a pump to boost the oil pressure. The laser imagining technique shows that the nozzles generate sprays that break-up within a short distance into spherical droplets, ligaments, ramifications and undefined structures. Tests on the packaged compressors reveal that the advanced configurations provide almost the same air flow rate while utilizing half of the oil because the sprays generate a good sealing. Moreover, the sprayed oil is acting as a thermal ballast because the electrical input is reduced by 3.0% and 3.5%, respectively, if the pump is not or is present, while the Specific Energy Requirement, accounting for the slightly reduced air flow, by 2.4% and 2.9%, respectively

Giulio Contaldi - One of the best experts on this subject based on the ideXlab platform.

  • experimental evidence of the thermal effect of lubricating oil sprayed in sliding vane air compressors
    Case Studies in Thermal Engineering, 2014
    Co-Authors: Gianluca Valenti, Stefano Murgia, Giulio Contaldi, Alessandro Valenti
    Abstract:

    Abstract A way to increase the efficiency of positive-displacement air compressor is spraying the lube oil to exploit it not only as lubricating and sealing agent but also as thermal ballast. This work seeks the experimental evidence in sliding-vane compressors by measuring the air standard volume flow rate and the electrical power input of three diverse configurations. The first configuration, taken as the reference, employs a conventional injection system comprising calibrated straight orifices. The other two, referred to as advanced, adopt smaller orifices and pressure-swirl full-cone nozzles designed for the purpose; the third configuration utilizes a pump to boost the oil pressure. The laser imagining technique shows that the nozzles generate sprays that break-up within a short distance into spherical droplets, ligaments, ramifications and undefined structures. Tests on the packaged compressors reveal that the advanced configurations provide almost the same air flow rate while utilizing half of the oil because the sprays generate a good sealing. Moreover, the sprayed oil is acting as a thermal ballast because the electrical input is reduced by 3.5% and 3.0%, respectively, if the pump is present or not , while the Specific Energy Requirement, accounting for the slightly reduced air flow, by 2.4% and 2.9%, respectively.

  • Experimental evidence of the thermal effect of lubricating oil sprayed in sliding-vane air compressors
    'Elsevier BV', 2014
    Co-Authors: Valenti Gianluca, Stefano Murgia, Giulio Contaldi, Alessandro Valenti
    Abstract:

    A way to increase the efficiency of positive-displacement air compressor is spraying the lube oil to exploit it not only as lubricating and sealing agent but also as thermal ballast. This work seeks the experimental evidence in sliding-vane compressors by measuring the air standard volume flow rate and the electrical power input of three diverse configurations. The first configuration, taken as reference, employs a conventional injection system comprising calibrated straight orifices. The other two, referred to as advanced, adopt smaller orifices and pressure-swirl full-cone nozzles designed for the purpose; the third configuration utilizes a pump to boost the oil pressure. The laser imagining technique shows that the nozzles generate sprays that break-up within a short distance into spherical droplets, ligaments, ramifications and undefined structures. Tests on the packaged compressors reveal that the advanced configurations provide almost the same air flow rate while utilizing half of the oil because the sprays generate a good sealing. Moreover, the sprayed oil is acting as a thermal ballast because the electrical input is reduced by 3.0% and 3.5%, respectively, if the pump is not or is present, while the Specific Energy Requirement, accounting for the slightly reduced air flow, by 2.4% and 2.9%, respectively

Moonyong Lee - One of the best experts on this subject based on the ideXlab platform.

  • knowledge inspired investigation of selected parameters on Energy consumption in nitrogen single and dual expander processes of natural gas liquefaction
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Mohd Shariq Khan, Sanggyu Lee, Mesfin Getu, Moonyong Lee
    Abstract:

    Abstract Nitrogen based single and dual expander processes were analyzed for efficiency improvement considering compression Energy minimization as objective. The significant parameters of nitrogen single and dual expander processes were investigated for their effect on the compression Energy Requirement. Thereafter optimization of single expander process was performed using process knowledge and for dual nitrogen expander process a customized algorithm inspired by the knowledge of design variables process is devised. The optimization results, in the Specific Energy Requirement of 0.7449 kWh/kg LNG for single and 0.5007 kWh/kg LNG for dual nitrogen expander processes. The optimization results comparison with previous published studies show a significant Energy savings. Furthermore, the proposed optimization methodology is flexible to be extended for any kind of single and dual expander process.