The Experts below are selected from a list of 3747 Experts worldwide ranked by ideXlab platform
M Yokoi - One of the best experts on this subject based on the ideXlab platform.
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development of a ground source heat pump system with ground heat exchanger utilizing the cast in place Concrete Pile foundations of buildings
ASHRAE Transactions. 2007 Winter Meeting. Volume 113 part 1 + CD-ROM., 2007Co-Authors: K Sekine, Ryozo Ooka, M YokoiAbstract:Ground-source (geothermal) heat pump (GSHP) systems can achieve a higher COP than conventional air-source heat pump (ASHP) systems. However, GSHP systems are not widespread in Japan because of their expensive boring costs. The authors have developed a GSHP system that uses the cast-in-place Concrete Pile foundations of a building as heat exchangers to reduce the initial boring cost. In this system, some U-tubes are arranged around the surface of a cast-in-place Concrete Pile foundation. The heat exchange capability of this system, subterranean temperature changes, and heat pump performance were investigated in a full-scale experiment. As a result, the average values for heat rejection were 186-201 W/m (per Pile, 25 W/m per pair of tubes) while cooling. The average COP of this system was 4.89 while cooling, rendering this system about 1.7 times more effective in energy-saving terms than the more typical ASHP systems. The initial cost of construction per unit for heat extraction and rejection is USD 0.79/W for this system, whereas it is USD 3/W for existing standard borehole systems. Therefore, this system is expected to be commercially viable.
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development of a ground source heat pump system with ground heat exchanger utilizing the cast in place Concrete Pile foundations of a building
8th IEA Heat Pump Conference 2005: global advances in heat pump technology applications and markets. Conference proceedings [CD-ROM]., 2005Co-Authors: Ryozo Ooka, K Sekine, M YokoiAbstract:Ground-source (Geothermal) heat pump (GSHP) systems can achieve a higher coefficient of performance than conventional air-source heat pump (ASHP) systems. However, GSHP systems are not widespread in Japan because of their expensive boring costs. The authors have developed a GSHP system that employs the cast-in-place Concrete Pile foundations of a building as heat exchangers in order to reduce the initial boring cost. In this system, eight U-tubes are arranged around the surface of a cast-in-place Concrete Pile foundation. The heat exchange capability of this system, subterranean temperature changes and heat pump performance were investigated in a full-scale experiment. As a result, the average values for heat rejection were 186~201 W/m (per Pile, 25 W/m per pair of tubes) while cooling. The average COP of this system was 4.89 while cooling; rendering this system about 1.7 times more effective in energy saving terms than the more typical ASHP systems. The initial cost of construction per unit for heat extraction and rejection is ¥79/W (approx. US$0.79/W) for this system, whereas it is ¥300/W (US$3/W) for existing standard borehole systems. Therefore, this system is expected to be commercially viable.
Liqun Chen - One of the best experts on this subject based on the ideXlab platform.
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Model test study of effect of inclination on bearing behaviors of plastic tube cast-in-place Concrete Pile
Yanshilixue Yu Gongcheng Xuebao Chinese Journal of Rock Mechanics and Engineering, 2011Co-Authors: Xiaohui Wang, C. Qi, Y An, Ying Chen, Liqun ChenAbstract:The bearing behaviors of vertical Pile and inclined Piles with inclination angles of 5°, 8°, 10° and 15° are contrasted according to model test. Effects of inclination on the bearing capacity of single plastic tube cast-in-place Concrete Pile (TC Pile for short), Pile-top settlement, Pile shaft horizontal displacement, bending moment along Pile shaft, skin friction and the ratio of tip resistance to load on Pile top are analyzed. The model test results show that: (1) Effects of Pile inclination on the bearing capacity and Pile-top settlement are not apparent when the inclination angle of TC Pile is less than 8°; but for the inclined Piles with inclination angles of 10° and 15°, the reduction of bearing capacity of single Pile is significant. (2) Horizontal displacement and bending moment of Pile shaft mainly occur in the upper one third of Pile length; and both go up with the increase of load and inclination angle. (3) Skin frictions of vertical Pile and each inclined Pile first increase and then decrease with the increase of Pile depth; and the mean values of ultimate skin frictions increase slightly with the increase of inclination angle; and the bearing ratio of skin friction is large. (4) Tip resistance and the ratio of tip resistance to load on Pile top go up with the increase of load and fall with the increase of inclination angle. The Origin software is applied to fit the curve between ultimate bearing capacity and inclination angle with Sigmoidal function. The formula is obtained to calculate the ultimate bearing capacity of inclined Pile. Based on the field data, the range of correction factor is gained.
Zhengzhou Chen - One of the best experts on this subject based on the ideXlab platform.
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bearing capacity and settlement of Concrete cored dcm Pile in soft ground
Geotechnical and Geological Engineering, 2004Co-Authors: Ping Dong, Zhengzhou ChenAbstract:A new kind of composite Pile named Concrete-cored DCM (Deep-Cement-Mixing) Pile is introduced for supporting medium loads in soft clay ground. This composite Pile is composed of an inner precast Concrete Pile and an external DCM Pile socket, where the high strength Concrete Pile is designed to bear the load of building, and DCM Pile socket acts to transfer axial force into the surrounding soils by skin frictions. In this paper we introduce its application in soft ground, and tentatively investigated its bearing capacity and settlement using static loading tests and Finite Element Method. Our study indicates that Concrete-cored DCM Pile acts as a friction Pile and is an economical and effective method for settlement control and capacity improvement in soft clay ground. This study is also valuable for research on the mechanism of other composite Piles.
Shousheng Li - One of the best experts on this subject based on the ideXlab platform.
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Notice of Retraction Numerical simulation on heat storage of underground Concrete Pile
2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010Co-Authors: Yan Zhao, Shenghui Huang, Dajun Zhao, Shousheng LiAbstract:In order to study the feasibility on heat storage of underground Concrete, this paper set up the mathematical model on thermal storage of underground Concrete Pile. And it adopted ANSYS finite element analysis software to numerically simulate the temperature field of underground Concrete Pile. The analysis showed that: during the period of heat storage, the distribution of temperature field which caused by heat exchange between thermal storage medium and Concrete Pile was uneven and astable. In addition, the temperature close to the heat exchanger was highest and gradually decreased along the radius direction. The underground create Pile not only stored heat energy effectively, but also made full use of underground space.
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Numerical simulation on heat storage of underground Concrete Pile
Computer Application and System Modeling (ICCASM) 2010 International Conference on, 2010Co-Authors: Yan Zhao, Shenghui Huang, Shousheng Li, Dajun Zhao, Yirong YaoAbstract:In order to study the feasibility on heat storage of underground Concrete, this paper set up the mathematical model on thermal storage of underground Concrete Pile. And it adopted ANSYS finite element analysis software to numerically simulate the temperature field of underground Concrete Pile. The analysis showed that: during the period of heat storage, the distribution of temperature field which caused by heat exchange between thermal storage medium and Concrete Pile was uneven and astable. In addition, the temperature close to the heat exchanger was highest and gradually decreased along the radius direction. The underground create Pile not only stored heat energy effectively, but also made full use of underground space.
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Notice of Retraction: Numerical simulation on heat storage of underground Concrete Pile
2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010Co-Authors: Yan Zhao, Shenghui Huang, Dajun Zhao, Shousheng LiAbstract:This article has been retracted by the publisher.
Yan Zhao - One of the best experts on this subject based on the ideXlab platform.
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Notice of Retraction Numerical simulation on heat storage of underground Concrete Pile
2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010Co-Authors: Yan Zhao, Shenghui Huang, Dajun Zhao, Shousheng LiAbstract:In order to study the feasibility on heat storage of underground Concrete, this paper set up the mathematical model on thermal storage of underground Concrete Pile. And it adopted ANSYS finite element analysis software to numerically simulate the temperature field of underground Concrete Pile. The analysis showed that: during the period of heat storage, the distribution of temperature field which caused by heat exchange between thermal storage medium and Concrete Pile was uneven and astable. In addition, the temperature close to the heat exchanger was highest and gradually decreased along the radius direction. The underground create Pile not only stored heat energy effectively, but also made full use of underground space.
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Numerical simulation on heat storage of underground Concrete Pile
Computer Application and System Modeling (ICCASM) 2010 International Conference on, 2010Co-Authors: Yan Zhao, Shenghui Huang, Shousheng Li, Dajun Zhao, Yirong YaoAbstract:In order to study the feasibility on heat storage of underground Concrete, this paper set up the mathematical model on thermal storage of underground Concrete Pile. And it adopted ANSYS finite element analysis software to numerically simulate the temperature field of underground Concrete Pile. The analysis showed that: during the period of heat storage, the distribution of temperature field which caused by heat exchange between thermal storage medium and Concrete Pile was uneven and astable. In addition, the temperature close to the heat exchanger was highest and gradually decreased along the radius direction. The underground create Pile not only stored heat energy effectively, but also made full use of underground space.
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Notice of Retraction: Numerical simulation on heat storage of underground Concrete Pile
2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010Co-Authors: Yan Zhao, Shenghui Huang, Dajun Zhao, Shousheng LiAbstract:This article has been retracted by the publisher.