The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Shicai Kuang - One of the best experts on this subject based on the ideXlab platform.
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non uniformity of gas liquid flow in a riser and impact of operation and Pipe Configuration on slugging characteristics
Experimental Thermal and Fluid Science, 2018Co-Authors: Wensheng Li, Quanhong Wu, Hongliang Zhou, Shicai KuangAbstract:Abstract A Pipeline-riser system is a typical complex Pipe Configuration in which the non-uniformity of gas/liquid flow is observed to be significant under certain flow rates. This article interprets slugging flow, the most common flow regime in a Pipeline-riser system, in the context of non-uniformity, which differs from the approaches used to characterise slugging cycles in previous studies. By comparing data collected by several transmitters positioned locally on the riser and comparing flow in a simple vertical Pipe, both the temporal and spatial non-uniformity of the gas/liquid distribution in the riser is presented and interpreted; the relationship between them is also illustrated. The non-uniformity of the flow provides an effective means to quantitatively evaluate the severity of slugging in a Pipeline-riser system under different operating conditions. In addition to flow uniformity, specific flow characteristics can be affected by operating conditions as well as Pipe Configuration. Several factors closely related to the design of experimental facilities and procedures are investigated by a case study of three experimental loops with different layouts and dimensions, and several general findings are summarised. The results may contribute to a better and more specific understanding of gas/liquid flow mechanisms in a Pipeline-riser system in addition to serving as a means to evaluate the features of laboratory Pipeline-riser systems and the applicability of laboratory results in industrial cases.
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Non-uniformity of gas/liquid flow in a riser and impact of operation and Pipe Configuration on slugging characteristics
Experimental Thermal and Fluid Science, 2018Co-Authors: Wensheng Li, Quanhong Wu, Hongliang Zhou, Shicai KuangAbstract:Abstract A Pipeline-riser system is a typical complex Pipe Configuration in which the non-uniformity of gas/liquid flow is observed to be significant under certain flow rates. This article interprets slugging flow, the most common flow regime in a Pipeline-riser system, in the context of non-uniformity, which differs from the approaches used to characterise slugging cycles in previous studies. By comparing data collected by several transmitters positioned locally on the riser and comparing flow in a simple vertical Pipe, both the temporal and spatial non-uniformity of the gas/liquid distribution in the riser is presented and interpreted; the relationship between them is also illustrated. The non-uniformity of the flow provides an effective means to quantitatively evaluate the severity of slugging in a Pipeline-riser system under different operating conditions. In addition to flow uniformity, specific flow characteristics can be affected by operating conditions as well as Pipe Configuration. Several factors closely related to the design of experimental facilities and procedures are investigated by a case study of three experimental loops with different layouts and dimensions, and several general findings are summarised. The results may contribute to a better and more specific understanding of gas/liquid flow mechanisms in a Pipeline-riser system in addition to serving as a means to evaluate the features of laboratory Pipeline-riser systems and the applicability of laboratory results in industrial cases.
Luc Nguyen - One of the best experts on this subject based on the ideXlab platform.
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Designing coaxial ground heat exchangers with a thermally enhanced outer Pipe
Geothermal Energy, 2015Co-Authors: Jasmin Raymond, Serge Mercier, Luc NguyenAbstract:Background Ground heat exchangers installed in boreholes are an expensive component of a ground-coupled heat pump system, where minimizing the borehole length with appropriate materials and Configuration can reduce the overall cost of the system. Methods Design calculations performed analytically indicate that the coaxial Pipe Configuration can be more advantageous than the single U-Pipe Configuration to reduce the total borehole length of a system. Results A decrease of the borehole thermal resistance and an increase of the thermal mass of water contained in the coaxial exchanger helped to reduce borehole length by up to 23% for a synthetic building load profile dominated by cooling. The decrease of the borehole thermal resistance was achieved with an outer Pipe made of thermally enhanced high-density polyethylene, where the thermal conductivity is 0.7 W m^-1 K^-1. Conclusions The coaxial Configuration requires further investigations of the technical barriers related to the installation of ground heat exchangers in the field.
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Designing coaxial ground heat exchangers with a thermally enhanced outer Pipe
Geothermal Energy, 2015Co-Authors: Jasmin Raymond, Serge Mercier, Luc NguyenAbstract:Ground heat exchangers installed in boreholes are an expensive component of a ground-coupled heat pump system, where minimizing the borehole length with appropriate materials and Configuration can reduce the overall cost of the system. Design calculations performed analytically indicate that the coaxial Pipe Configuration can be more advantageous than the single U-Pipe Configuration to reduce the total borehole length of a system. A decrease of the borehole thermal resistance and an increase of the thermal mass of water contained in the coaxial exchanger helped to reduce borehole length by up to 23% for a synthetic building load profile dominated by cooling. The decrease of the borehole thermal resistance was achieved with an outer Pipe made of thermally enhanced high-density polyethylene, where the thermal conductivity is 0.7 W m-1 K-1. The coaxial Configuration requires further investigations of the technical barriers related to the installation of ground heat exchangers in the field.
Wensheng Li - One of the best experts on this subject based on the ideXlab platform.
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non uniformity of gas liquid flow in a riser and impact of operation and Pipe Configuration on slugging characteristics
Experimental Thermal and Fluid Science, 2018Co-Authors: Wensheng Li, Quanhong Wu, Hongliang Zhou, Shicai KuangAbstract:Abstract A Pipeline-riser system is a typical complex Pipe Configuration in which the non-uniformity of gas/liquid flow is observed to be significant under certain flow rates. This article interprets slugging flow, the most common flow regime in a Pipeline-riser system, in the context of non-uniformity, which differs from the approaches used to characterise slugging cycles in previous studies. By comparing data collected by several transmitters positioned locally on the riser and comparing flow in a simple vertical Pipe, both the temporal and spatial non-uniformity of the gas/liquid distribution in the riser is presented and interpreted; the relationship between them is also illustrated. The non-uniformity of the flow provides an effective means to quantitatively evaluate the severity of slugging in a Pipeline-riser system under different operating conditions. In addition to flow uniformity, specific flow characteristics can be affected by operating conditions as well as Pipe Configuration. Several factors closely related to the design of experimental facilities and procedures are investigated by a case study of three experimental loops with different layouts and dimensions, and several general findings are summarised. The results may contribute to a better and more specific understanding of gas/liquid flow mechanisms in a Pipeline-riser system in addition to serving as a means to evaluate the features of laboratory Pipeline-riser systems and the applicability of laboratory results in industrial cases.
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Non-uniformity of gas/liquid flow in a riser and impact of operation and Pipe Configuration on slugging characteristics
Experimental Thermal and Fluid Science, 2018Co-Authors: Wensheng Li, Quanhong Wu, Hongliang Zhou, Shicai KuangAbstract:Abstract A Pipeline-riser system is a typical complex Pipe Configuration in which the non-uniformity of gas/liquid flow is observed to be significant under certain flow rates. This article interprets slugging flow, the most common flow regime in a Pipeline-riser system, in the context of non-uniformity, which differs from the approaches used to characterise slugging cycles in previous studies. By comparing data collected by several transmitters positioned locally on the riser and comparing flow in a simple vertical Pipe, both the temporal and spatial non-uniformity of the gas/liquid distribution in the riser is presented and interpreted; the relationship between them is also illustrated. The non-uniformity of the flow provides an effective means to quantitatively evaluate the severity of slugging in a Pipeline-riser system under different operating conditions. In addition to flow uniformity, specific flow characteristics can be affected by operating conditions as well as Pipe Configuration. Several factors closely related to the design of experimental facilities and procedures are investigated by a case study of three experimental loops with different layouts and dimensions, and several general findings are summarised. The results may contribute to a better and more specific understanding of gas/liquid flow mechanisms in a Pipeline-riser system in addition to serving as a means to evaluate the features of laboratory Pipeline-riser systems and the applicability of laboratory results in industrial cases.
Jasmin Raymond - One of the best experts on this subject based on the ideXlab platform.
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Designing coaxial ground heat exchangers with a thermally enhanced outer Pipe
Geothermal Energy, 2015Co-Authors: Jasmin Raymond, Serge Mercier, Luc NguyenAbstract:Background Ground heat exchangers installed in boreholes are an expensive component of a ground-coupled heat pump system, where minimizing the borehole length with appropriate materials and Configuration can reduce the overall cost of the system. Methods Design calculations performed analytically indicate that the coaxial Pipe Configuration can be more advantageous than the single U-Pipe Configuration to reduce the total borehole length of a system. Results A decrease of the borehole thermal resistance and an increase of the thermal mass of water contained in the coaxial exchanger helped to reduce borehole length by up to 23% for a synthetic building load profile dominated by cooling. The decrease of the borehole thermal resistance was achieved with an outer Pipe made of thermally enhanced high-density polyethylene, where the thermal conductivity is 0.7 W m^-1 K^-1. Conclusions The coaxial Configuration requires further investigations of the technical barriers related to the installation of ground heat exchangers in the field.
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Designing coaxial ground heat exchangers with a thermally enhanced outer Pipe
Geothermal Energy, 2015Co-Authors: Jasmin Raymond, Serge Mercier, Luc NguyenAbstract:Ground heat exchangers installed in boreholes are an expensive component of a ground-coupled heat pump system, where minimizing the borehole length with appropriate materials and Configuration can reduce the overall cost of the system. Design calculations performed analytically indicate that the coaxial Pipe Configuration can be more advantageous than the single U-Pipe Configuration to reduce the total borehole length of a system. A decrease of the borehole thermal resistance and an increase of the thermal mass of water contained in the coaxial exchanger helped to reduce borehole length by up to 23% for a synthetic building load profile dominated by cooling. The decrease of the borehole thermal resistance was achieved with an outer Pipe made of thermally enhanced high-density polyethylene, where the thermal conductivity is 0.7 W m-1 K-1. The coaxial Configuration requires further investigations of the technical barriers related to the installation of ground heat exchangers in the field.
Guillermo A Narsilio - One of the best experts on this subject based on the ideXlab platform.
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energy diaphragm wall thermal design the effects of Pipe Configuration and spacing
Renewable Energy, 2020Co-Authors: Nikolas Makasis, Guillermo A NarsilioAbstract:Abstract Energy geo-structures utilise underground structures primarily designed for structural and geo-mechanical stability to also provide renewable geothermal energy for heating and cooling purposes. Piping is incorporated in the structures to exchange heat with the ground via a carrier (water) and connected to a ground-coupled heat pump on the building side. This work focuses on energy diaphragm walls, expanding on the limited available knowledge and undertaking a comprehensive parametric analysis using experimentally validated numerical modelling. Focus is put on the wall Pipe Configuration and spacing, which are parameters the geothermal design can directly control, however, the effects of ground thermal conductivity and wall depth are also considered. The wall depth is shown as a critical factor to the thermal performance and low thermal conductivity material sites might require deep energy walls for a cost-effective design. Larger Pipe spacing (≥500 mm) appears preferable, despite less piping being placed, since small spacing leads to increased costs but insignificant thermal performance gains. Comparing the horizontal and vertical Pipe Configurations, relatively small temperature differences of less than 1 °C are found. Moreover, the former can be less expensive for multiple-section deeper walls, while the latter for shorter walls or when construction delays are non-critical.
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Numerical modelling of ground heat exchangers with different ground loop Configurations for direct geothermal applications
2020Co-Authors: Asal Bidarmaghz, Guillermo A Narsilio, Ian W. JohnstonAbstract:The design of ground heat exchangers (GHEs) involves the selection of detailed Configuration options. However, there is limited understanding of the relative importance of different design choices on performance. This study investigates the effects of different design parameters such as Pipe Configuration and fluid flow rate on the heat extraction rate, and will be helpful to design a system which is energy efficient and cost effective. Different Pipe Configurations in vertical grouted boreholes including single U-Pipe, double U-Pipe, and double cross U-Pipes for small diameter boreholes, and spiral and multiple U-Pipes for larger diameter boreholes, are modelled in detail using state-of-the-art finite element methods. The effects of GHE Configurations and fluid flow rate on system efficiency is determined and contrasted. Numerical results indicate that the thermal performance of the system is enhanced by transitioning from laminar to turbulent regime, and by increasing the volume of carrier fluid inside the Pipes for a given GHE length (i.e., single versus double Pipes). However, in larger diameter boreholes, GHE's thermal performance does not change significantly for different Pipe Configurations with similar Pipe lengths inside the borehole (i.e., spiral versus multiple U-Pipes).