The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Kw Mui - One of the best experts on this subject based on the ideXlab platform.

  • Modeling Study of Design Flow Rates for Cascade Water Supply Systems in Residential Skyscrapers
    Water, 2019
    Co-Authors: Yang Zhou, Ling Tim Wong, Eric Wai Ming Lee, Kw Mui
    Abstract:

    Skyscrapers are common nowadays around the world, especially in cities with limited development area. In order to pump water up to the higher level of a skyscraper, a cascade water supply system has to be installed. Currently, cascade water supply systems are mainly Designed based on practical experiences or requirements of existing standards/guidelines that, in fact, are not specifically for skyscrapers. However, thorough studies on cascade water supply system Designs are still limited in the literature. This study proposes mathematical models and uses Monte Carlo simulations to evaluate the Design Flow Rate of a typical cascade water supply system that feeds various appliances in a residential skyscraper in Hong Kong. Graphs that showed the correlations between the inFlow Rate in the supply pipe and water volume in the tank are obtained. While tank storage volume is confirmed, the Design Flow Rate of the cascade water supply system can be determined from these graphs. The proposed mathematical models can also be applied to evaluate the Design Flow Rate of cascade water supply systems in other types of skyscrapers (e.g., office, commercial building) as well as with the changes in water demand patterns in the models.

  • Evaluation of Design Flow Rate of Water Supply Systems with Low Flow Showering Appliances
    Water, 2019
    Co-Authors: Yang Zhou, Kw Mui, Ling Tim Wong
    Abstract:

    The installation of water efficient appliances is an efficient demand-side water management measure favored by policymakers and water providers nowadays. The adoption of low Flow showerheads in large and complex plumbing systems will not only contribute to a great reduction of shower water use in the whole water system, but also further influence the water supply system Design. Hence, it is necessary to justify the reDesign of existing water supply systems (such as the pipe size, storage tank volume, pumping arrangement etc.) in terms of the use of low Flow showerheads. This study uses Monte Carlo simulations to evaluate the Design Flow Rate for a typical high-rise roof tank water supply system in Hong Kong with the installation of low Flow showerheads. The simulation results indicate that a full installation of low Flow showerheads can decrease the Design Flow Rate by 15%, corresponding to an energy efficiency improvement of 1.5%. The potential for water savings and associated energy savings can be significantly higher when all installed appliances in homes are water efficient (e.g., showerheads, water taps, washing machines). Further work is required to evaluate the reDesign of existing water supply systems for a sustainable future.

  • Evaluation of Design Flow Rate ofwater supply systems with low Flow showering appliances
    'MDPI AG', 2019
    Co-Authors: Zhou Y, Kw Mui, Lt Wong
    Abstract:

    The installation of water efficient appliances is an efficient demand-side water management measure favored by policymakers and water providers nowadays. The adoption of low Flow showerheads in large and complex plumbing systems will not only contribute to a great reduction of shower water use in the whole water system, but also further influence the water supply system Design. Hence, it is necessary to justify the reDesign of existing water supply systems (such as the pipe size, storage tank volume, pumping arrangement etc.) in terms of the use of low Flow showerheads. This study uses Monte Carlo simulations to evaluate the Design Flow Rate for a typical high-rise roof tank water supply system in Hong Kong with the installation of low Flow showerheads. The simulation results indicate that a full installation of low Flow showerheads can decrease the Design Flow Rate by 15%, corresponding to an energy efficiency improvement of 1.5%. The potential for water savings and associated energy savings can be significantly higher when all installed appliances in homes are water efficient (e.g., showerheads, water taps, washing machines). Further work is required to evaluate the reDesign of existing water supply systems for a sustainable future.Department of Building Services Engineering201904 bcmapublished_fina

Ling Tim Wong - One of the best experts on this subject based on the ideXlab platform.

  • Modeling Study of Design Flow Rates for Cascade Water Supply Systems in Residential Skyscrapers
    Water, 2019
    Co-Authors: Yang Zhou, Ling Tim Wong, Eric Wai Ming Lee, Kw Mui
    Abstract:

    Skyscrapers are common nowadays around the world, especially in cities with limited development area. In order to pump water up to the higher level of a skyscraper, a cascade water supply system has to be installed. Currently, cascade water supply systems are mainly Designed based on practical experiences or requirements of existing standards/guidelines that, in fact, are not specifically for skyscrapers. However, thorough studies on cascade water supply system Designs are still limited in the literature. This study proposes mathematical models and uses Monte Carlo simulations to evaluate the Design Flow Rate of a typical cascade water supply system that feeds various appliances in a residential skyscraper in Hong Kong. Graphs that showed the correlations between the inFlow Rate in the supply pipe and water volume in the tank are obtained. While tank storage volume is confirmed, the Design Flow Rate of the cascade water supply system can be determined from these graphs. The proposed mathematical models can also be applied to evaluate the Design Flow Rate of cascade water supply systems in other types of skyscrapers (e.g., office, commercial building) as well as with the changes in water demand patterns in the models.

  • Evaluation of Design Flow Rate of Water Supply Systems with Low Flow Showering Appliances
    Water, 2019
    Co-Authors: Yang Zhou, Kw Mui, Ling Tim Wong
    Abstract:

    The installation of water efficient appliances is an efficient demand-side water management measure favored by policymakers and water providers nowadays. The adoption of low Flow showerheads in large and complex plumbing systems will not only contribute to a great reduction of shower water use in the whole water system, but also further influence the water supply system Design. Hence, it is necessary to justify the reDesign of existing water supply systems (such as the pipe size, storage tank volume, pumping arrangement etc.) in terms of the use of low Flow showerheads. This study uses Monte Carlo simulations to evaluate the Design Flow Rate for a typical high-rise roof tank water supply system in Hong Kong with the installation of low Flow showerheads. The simulation results indicate that a full installation of low Flow showerheads can decrease the Design Flow Rate by 15%, corresponding to an energy efficiency improvement of 1.5%. The potential for water savings and associated energy savings can be significantly higher when all installed appliances in homes are water efficient (e.g., showerheads, water taps, washing machines). Further work is required to evaluate the reDesign of existing water supply systems for a sustainable future.

Yang Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Modeling Study of Design Flow Rates for Cascade Water Supply Systems in Residential Skyscrapers
    Water, 2019
    Co-Authors: Yang Zhou, Ling Tim Wong, Eric Wai Ming Lee, Kw Mui
    Abstract:

    Skyscrapers are common nowadays around the world, especially in cities with limited development area. In order to pump water up to the higher level of a skyscraper, a cascade water supply system has to be installed. Currently, cascade water supply systems are mainly Designed based on practical experiences or requirements of existing standards/guidelines that, in fact, are not specifically for skyscrapers. However, thorough studies on cascade water supply system Designs are still limited in the literature. This study proposes mathematical models and uses Monte Carlo simulations to evaluate the Design Flow Rate of a typical cascade water supply system that feeds various appliances in a residential skyscraper in Hong Kong. Graphs that showed the correlations between the inFlow Rate in the supply pipe and water volume in the tank are obtained. While tank storage volume is confirmed, the Design Flow Rate of the cascade water supply system can be determined from these graphs. The proposed mathematical models can also be applied to evaluate the Design Flow Rate of cascade water supply systems in other types of skyscrapers (e.g., office, commercial building) as well as with the changes in water demand patterns in the models.

  • Evaluation of Design Flow Rate of Water Supply Systems with Low Flow Showering Appliances
    Water, 2019
    Co-Authors: Yang Zhou, Kw Mui, Ling Tim Wong
    Abstract:

    The installation of water efficient appliances is an efficient demand-side water management measure favored by policymakers and water providers nowadays. The adoption of low Flow showerheads in large and complex plumbing systems will not only contribute to a great reduction of shower water use in the whole water system, but also further influence the water supply system Design. Hence, it is necessary to justify the reDesign of existing water supply systems (such as the pipe size, storage tank volume, pumping arrangement etc.) in terms of the use of low Flow showerheads. This study uses Monte Carlo simulations to evaluate the Design Flow Rate for a typical high-rise roof tank water supply system in Hong Kong with the installation of low Flow showerheads. The simulation results indicate that a full installation of low Flow showerheads can decrease the Design Flow Rate by 15%, corresponding to an energy efficiency improvement of 1.5%. The potential for water savings and associated energy savings can be significantly higher when all installed appliances in homes are water efficient (e.g., showerheads, water taps, washing machines). Further work is required to evaluate the reDesign of existing water supply systems for a sustainable future.

Ronald J. Beaudoin - One of the best experts on this subject based on the ideXlab platform.

  • Turbulence Measurements in a Centrifugal Pump With a Synchronously Orbiting Impeller
    Journal of Turbomachinery, 1992
    Co-Authors: Ronald D. Flack, Steven M. Miner, Ronald J. Beaudoin
    Abstract:

    Turbulence profiles were measured in a centrifugal pump with an impeller with backswept blades using a two-directional laser velocimeter. Data presented include radial, tangential, and cross product Reynolds stresses. Blade-to-blade profiles were measured at four circumferential positions and four radii within and one radius outside the four-bladed impeller. The pump was tested in two configurations : with the impeller running centered within the volute, and with the impeller orbiting with a synchronous motion (e/r 2 =0.016). Flow Rates ranged from 40 to 106 percent of the Design Flow Rate

  • Turbulence Measurements in a Centrifugal Pump With a Synchronously Orbiting Impeller
    Volume 1: Turbomachinery, 1991
    Co-Authors: Ronald D. Flack, Steven M. Miner, Ronald J. Beaudoin
    Abstract:

    Turbulence profiles were measured in a centrifugal pump with an impeller with backswept blades using a two directional laser velocimeter. Data presented includes radial, tangential, and cross product Reynolds stresses. Blade to blade profiles were measured at four circumferential positions and four radii within and one radius outside the four bladed impeller. The pump was tested in two configurations; with the impeller running centered within the volute, and with the impeller orbiting with a synchronous motion (e/r2 = 0.016). Flow Rates ranged from 40% to 106% of the Design Flow Rate. Variation in profiles among the individual passages in the orbiting impeller were found. For several regions the turbulence was isotropic so that the cross product Reynolds stress was low. At low Flow Rates the highest cross product Reynolds stress was near the exit. At near Design conditions the lowest cross product stress was near the exit, where uniform Flow was also observed. Also, near the exit of the impeller the highest turbulence levels were seen near the tongue. For the Design Flow Rate, inlet turbulence intensities were typically 9% and exit turbulence intensities were 6%. For 40% Flow capacity the values increased to 18% and 19%, respectively. Large local turbulence intensities correlated with sepaRated regions. The synchronous orbit did not increase the random turbulence, but did affect the turbulence in the individual channels in a systematic pattern.Copyright © 1991 by ASME

Ronald D. Flack - One of the best experts on this subject based on the ideXlab platform.

  • Two-Dimensional Flow Analysis of a Laboratory Centrifugal Pump
    Journal of Turbomachinery-transactions of The Asme, 1992
    Co-Authors: Steven M. Miner, Ronald D. Flack, Paul E. Allaire
    Abstract:

    Two-dimensional potential Flow was used to determine the velocity field within a laboratory centrifugal pump. In particular, the finite element techniquie was used to model the impeller and volute simultaneously. The rotatiion of the impeller within the volute was simulated by using steady-state solutions with the impeller in ten different angular orientations. This allowed the interaction between the impeller and the volute to develop naturally as a result of the solution. The results for the complete pump model showed that there are circumferential asymmetries in the velocity field, even at the Design Flow Rate

  • Turbulence Measurements in a Centrifugal Pump With a Synchronously Orbiting Impeller
    Journal of Turbomachinery, 1992
    Co-Authors: Ronald D. Flack, Steven M. Miner, Ronald J. Beaudoin
    Abstract:

    Turbulence profiles were measured in a centrifugal pump with an impeller with backswept blades using a two-directional laser velocimeter. Data presented include radial, tangential, and cross product Reynolds stresses. Blade-to-blade profiles were measured at four circumferential positions and four radii within and one radius outside the four-bladed impeller. The pump was tested in two configurations : with the impeller running centered within the volute, and with the impeller orbiting with a synchronous motion (e/r 2 =0.016). Flow Rates ranged from 40 to 106 percent of the Design Flow Rate

  • Turbulence Measurements in a Centrifugal Pump With a Synchronously Orbiting Impeller
    Volume 1: Turbomachinery, 1991
    Co-Authors: Ronald D. Flack, Steven M. Miner, Ronald J. Beaudoin
    Abstract:

    Turbulence profiles were measured in a centrifugal pump with an impeller with backswept blades using a two directional laser velocimeter. Data presented includes radial, tangential, and cross product Reynolds stresses. Blade to blade profiles were measured at four circumferential positions and four radii within and one radius outside the four bladed impeller. The pump was tested in two configurations; with the impeller running centered within the volute, and with the impeller orbiting with a synchronous motion (e/r2 = 0.016). Flow Rates ranged from 40% to 106% of the Design Flow Rate. Variation in profiles among the individual passages in the orbiting impeller were found. For several regions the turbulence was isotropic so that the cross product Reynolds stress was low. At low Flow Rates the highest cross product Reynolds stress was near the exit. At near Design conditions the lowest cross product stress was near the exit, where uniform Flow was also observed. Also, near the exit of the impeller the highest turbulence levels were seen near the tongue. For the Design Flow Rate, inlet turbulence intensities were typically 9% and exit turbulence intensities were 6%. For 40% Flow capacity the values increased to 18% and 19%, respectively. Large local turbulence intensities correlated with sepaRated regions. The synchronous orbit did not increase the random turbulence, but did affect the turbulence in the individual channels in a systematic pattern.Copyright © 1991 by ASME