Stepwise algorithm and new analytical model for estimating multi-parameter of energy piles from thermal response tests

2021 ◽  
pp. 111775
Author(s):  
Shu Zeng ◽  
Zhenguo Yan ◽  
Jun Yang
Keyword(s):  
Analytical Model ◽  
Thermal Response ◽  
Energy Piles

Measurement of Thermal Conductivity of a Flexible Substrate

2014 ◽  
Author(s):  
Vivek Vishwakarma ◽  
Ankur Jain
Keyword(s):  
Thermal Conductivity ◽  
Analytical Model ◽  
Flexible Substrate ◽  
Thermal Response ◽  
Experimental Methodology ◽  
Plastic Substrate ◽  
The Past ◽  
Thin Plastic ◽  
Transient Thermal ◽  
Transient Thermal Response

A number of past papers have described experimental techniques for measurement of thermal conductivity of substrates and thin films of technological interest. Nearly all substrates measured in the past are rigid. There is a lack of papers that report measurements on a flexible substrate such as thin plastic. The paper presents an experimental methodology to deposit a thin film microheater device on a plastic substrate. This device, comprising a microheater line and a temperature sensor line is used to measure the thermal conductivity of the plastic substrate using the transient thermal response of the plastic substrate to a heating current. An analytical model describing this thermal response is presented. Thermal conductivity of the plastic substrate is determined by comparison of experimental data with the analytical model. Results described in this paper may aid in development of an understanding of thermal transport in flexible substrates.

scholarly journals A COMBINED USE OF FDM AND DOE METHOD TO DERIVE A NEW TRANSIENT SIMPLIFIED SEMI-ANALYTICAL MODEL: A CASE STUDY OF ANHYDRITE RADIANT SLAB

2020 ◽  
Vol 330 ◽  
pp. 01002
Author(s):  
Abdelatif Merabtine ◽  
Abdelhamid Kheiri ◽  
Salim Mokraoui
Keyword(s):  
Surface Temperature ◽  
Analytical Model ◽  
Numerical Models ◽  
Thermal Response ◽  
Sensitivity Study ◽  
Conventional Heating ◽  
Heating Systems ◽  
Combined Use ◽  
Scale Test ◽  
Radiant Floor Heating

Radiant floor heating systems (FHS) are considered as reliable heating systems since they ensure maintaining inside air temperature and reduce its fluctuations more efficiently than conventional heating systems. The presented study investigates the dynamic thermal response of an experimental FHS equipped with an anhydrite radiant slab. A new simplified model based on an analytical correlation is proposed to evaluate the heating radiant slab surface temperature and examine its thermal behavior under dynamic conditions. In order the validate the developed analytical model, an experimental scenario, under transient conditions, was performed in a monitored full-scale test cell. 2D and 3D numerical models were also developed to evaluate the accuracy of the analytical model. The method of Design of Experiments (DoE) was used to both derive meta-models, to analytically estimate the surface temperature, and perform a sensitivity study.

A new analytical model for short-time analysis of energy piles and its application

2020 ◽  
Vol 224 ◽  
pp. 110221
Author(s):  
Jian Lan ◽  
Fei Lei ◽  
Pingfang Hu ◽  
Na Zhu
Keyword(s):  
Analytical Model ◽  
Time Analysis ◽  
Energy Piles ◽  
Short Time

scholarly journals Numerical analysis of a heat exchanger pile response in a Brazilian subtropical region

2020 ◽  
Vol 205 ◽  
pp. 05004
Author(s):  
Roberto Pimentel de Sousa Júnior ◽  
Renato Pinto da Cunha
Keyword(s):  
Heat Exchanger ◽  
Numerical Analysis ◽  
Thermal Response ◽  
Electrical Energy ◽  
Optimal Configuration ◽  
Subtropical Climate ◽  
Exchange Performance ◽  
Energy Piles ◽  
The University ◽  
Pile Response

Ground-coupled heat exchanger systems have been used as acclimatization systems for residential and commercial buildings in many countries. Brazil is the ninth largest consumer of electrical energy in the world, for this reason, local researchers are investigating the use of the energy piles in order to reduce the consumption of electricity. Thermal response tests have been carried out on a heat exchanger pile at the geotechnical experimental site of the University of São Paulo in São Carlos city, a region of subtropical climate. Simultaneously, using the thermal properties obtained in these tests, numerical analysis has been performed to investigate the heat exchange performance of energy piles installed in this site. For this numerical analysis, the effect of soil and concrete properties, pile geometry and the flow rate on the pile thermal response were evaluated. The current paper presents the results obtained by the analysis of 67 models tested to found an optimal configuration of an energy pile through the software COMSOL, using Heat Transfer and Non-Isothermal Pipe Flow modules. From this work, it was observed that the optimal configuration was obtained for a turbulent flow condition in piles in the heat exchanger pipes.

Effects of seasonal variations on the thermal response of energy piles in an unsaturated Brazilian tropical soil

2020 ◽  
Vol 216 ◽  
pp. 109971
Author(s):  
Thaise da Silva Oliveira Morais ◽  
Cristina de Hollanda Cavalcanti Tsuha ◽  
Luis Antonio Bandeira Neto ◽  
Rao Martand Singh
Keyword(s):  
Seasonal Variations ◽  
Thermal Response ◽  
Tropical Soil ◽  
Energy Piles

Coupled Structural/Thermal Analysis of Cylindrical Part of Multilayered Composite Vessel

2012 ◽  
Vol 445 ◽  
pp. 589-594 ◽  
Author(s):  
A. Hocine ◽  
F.K. Achira ◽  
H. Ghouaouala
Keyword(s):  
Thermal Analysis ◽  
Analytical Model ◽  
Laminate Composite ◽  
Thermal Response ◽  
Layered Composite ◽  
Cylindrical Part ◽  
End Effect ◽  
The Core ◽  
Temperature Distributions ◽  
Composite Vessel

This paper focuses on the coupled structural/thermal response of a cylindrical part of multi-layered composite vessel. Uniform and parabolic temperature distributions are chosen for the structural loads. In this work, an analytical model is proposed in which the laminate composite is assumed to be an anisotropic purely elastic material. Assuming that the interface between the core and skin are perfectly bound, continuity conditions for the displacement and stress, the suggested analytical model provides an exact solution for stresses and strains on the cylindrical section of the vessel solution submitted hygrothermal loading coupled with internal pressure with end effect.

scholarly journals Field test on thermal response characteristics of an energy pile in underground row piles

2020 ◽  
Vol 205 ◽  
pp. 05011
Author(s):  
Gangqiang Kong ◽  
Yang Zhou ◽  
Di Wu ◽  
Gaoxiang Yin ◽  
Hefu Pu
Keyword(s):  
Thermal Response ◽  
Field Tests ◽  
Mechanical Analysis ◽  
Input Power ◽  
Underground Structures ◽  
Energy Pile ◽  
Response Characteristics ◽  
Energy Piles ◽  
Shallow Geothermal Energy ◽  
Temperature Strain

Underground row piles are usually used in excavation of underground structures and abandoned after structural construction. The heat exchanger tubes embedded in the underground row piles can be severed as energy piles, which can exchange shallow geothermal energy. The construction process of the energy pile in the underground row piles was introduced. Compared with the traditional single energy pile, there is a special characteristic of the energy pile in underground row piles: piles are linked as a whole by the top beam at the top of the row pile. Field tests on the thermal response and thermo-mechanical characteristics of the energy pile in underground row piles were performed. The stable input power of 2.07 kW. The distribution of temperature, strain, and stress of pile body along depth were measured and discussed. It shows that the measured comprehensive thermal conductivity coefficient of soil is 3.72W/(m×K). In the thermo-mechanical analysis after heating, due to the end restrains by the top beam and toe in stiff rock, the rate of thermal stress to temperature change at the top and toe are -0.101 MPa/℃ (34% of fully restrain) and -0.061 MPa/℃ (20% of fully restrain).

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