05/00890 Modelling floor heating systems using a validated two-dimensional ground-coupled numerical model

The two-dimensional and two-phase model of the gas-liquid mixture is constructed. The validity of numerical model realization is justified by using a comparative analysis of test problems solution with one-dimensional calculations. The regularities of gas-saturated liquid outflow from axisymmetric vessels for different geometries are established.

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Energy Saving Potential of Radiant Floor Heating Assisted by an Air Source Heat Pump in Residential Buildings

Energies ◽

10.3390/en14051321 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1321

Author(s):

Yu-Jin Hwang ◽

Jae-Weon Jeong

Keyword(s):

Energy Saving ◽

Heat Pump ◽

Residential Buildings ◽

Heating Systems ◽

Air Source Heat Pump ◽

Heating Capacity ◽

Heating Loads ◽

Radiant Floor Heating ◽

Floor Heating ◽

Floor Temperature

The objective of this research is to establish an appropriate operating strategy for a radiant floor heating system that additionally has an air source heat pump for providing convective air heating separately, leading to heating energy saving and thermal comfort in residential buildings. To determine the appropriate optimal operating ratio of each system taking charge of combined heating systems, the energy consumption of the entire system was drawn, and the adaptive floor surface temperature was reviewed based on international standards and literature on thermal comfort. For processing heating loads with radiant floor heating and air source heating systems, the heating capacity of radiant floor heating by 1 °C variation in floor temperature was calculated, and the remaining heating load was handled by the heating capacity of the convective air heating heat pump. Consequently, when the floor temperature was 25 °C, all heating loads were removed by radiant floor heating only. When handling all heating loads with the heat pump, 59.2% less energy was used compared with radiant floor heating only. Considering the local discomfort of the soles of the feet, the floor temperature is expected to be suitable at 22–23 °C, and 31.5–37.6% energy saving compared with those of radiant floor heating alone were confirmed.

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Influence of the North Branch of the Qingshuigou River on the Lower Reaches of Yellow River Based on Two-dimensional Numerical Model

Journal of Physics Conference Series ◽

10.1088/1742-6596/1885/2/022043 ◽

2021 ◽

Vol 1885 (2) ◽

pp. 022043

Author(s):

Caodong Jiang ◽

Liangchao Ma ◽

Dongfeng Li ◽

Hongwu Zhang ◽

Zihao Li

Keyword(s):

Numerical Model ◽

Yellow River ◽

Two Dimensional ◽

The North

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Decreased scour on an external river bend using two-dimensional numerical model, in La Perla-Florida and Cantagallo sectors of Rímac river

2020 Congreso Internacional de Innovación y Tendencias en Ingeniería (CONIITI) ◽

10.1109/coniiti51147.2020.9240465 ◽

2020 ◽

Author(s):

Mauricio Bazan Ravines ◽

Jorge Coronado Vargas ◽

Sissi Santos Hurtado de Bazan

Keyword(s):

Numerical Model ◽

Two Dimensional ◽

River Bend

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Two-dimensional numerical model of electron cyclotron resonance discharge with pointwise mappings

Review of Scientific Instruments ◽

10.1063/1.2166429 ◽

2006 ◽

Vol 77 (3) ◽

pp. 03A345

Author(s):

V. Eruhimov ◽

V. Semenov

Keyword(s):

Numerical Model ◽

Cyclotron Resonance ◽

Electron Cyclotron Resonance ◽

Electron Cyclotron ◽

Two Dimensional

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Effect of micro in-plane fiber waviness on compressive properties of unidirectional fabric composites

Journal of Composite Materials ◽

10.1177/0021998317740197 ◽

2017 ◽

Vol 52 (15) ◽

pp. 2065-2074 ◽

Cited By ~ 3

Author(s):

Bo Wang ◽

Nobuhide Uda ◽

Kousei Ono ◽

Hiroto Nagai

Keyword(s):

Compressive Strength ◽

Numerical Model ◽

Tensile Stress ◽

Compressive Modulus ◽

Two Dimensional ◽

Compressive Properties ◽

Fiber Waviness ◽

Experimental Part ◽

Fabric Composites ◽

Vartm Process

In this paper, a combination of experimentation and analysis is used to study the effect of micro in-plane fiber waviness on the compressive properties of unidirectional fabric composites. The experimental part includes a measurement of the micro in-plane fiber waviness in two types of unidirectional fabrics, manufacturing composites with each unidirectional fabric via VaRTM process and tests for establishing the compressive modulus and strengths of the composites. The compressive strengths were confirmed to be affected by the micro in-plane fiber waviness, but the compressive modulus was not. Furthermore, a two-dimensional numerical model is proposed to explain our experimental results. The numerical results indicate that the tensile stress (owing to the micro in-plane fiber waviness) and compressive stress along the weft and warp directions, respectively, of the composite lead to reductions in the compressive strength.

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