A5049376014- Geothermal Energy Systems and Applications
- Building Energy and Comfort Optimization
- Groundwater flow and contamination studies
- Soil and Unsaturated Flow
- 3D Surveying and Cultural Heritage
- Hygrothermal properties of building materials
- Heat Transfer and Optimization
- Drilling and Well Engineering
- Phase Change Materials Research
- CO2 Sequestration and Geologic Interactions
- Geological Modeling and Analysis
- Adsorption and Cooling Systems
- Nanofluid Flow and Heat Transfer
- Concrete and Cement Materials Research
- Science, Technology, and Education in Latin America
- Environmental and Ecological Studies
- Geotechnical and construction materials studies
- Concrete Properties and Behavior
- Integrated Energy Systems Optimization
- Higher Education Teaching and Evaluation
- Solar Energy Systems and Technologies
- Tunneling and Rock Mechanics
- Hydraulic Fracturing and Reservoir Analysis
- Nuclear Engineering Thermal-Hydraulics
- Heat Transfer Mechanisms
Universitat Politècnica de València
2017-2024
To investigate the impacts of using nano-enhanced phase change materials on thermal performance a borehole heat exchanger in summer season, three-dimensional numerical model is created present work. Seven nanoparticles including Cu, CuO, Al2O3, TiO2, SiO2, multi-wall carbon nanotube, and graphene are added to Paraffin. Considering highest melting rate lowest outlet temperature, selected material evaluated terms volume fraction (0.05, 0.10, 0.15, 0.20) then shape (sphere, brick, cylinder,...
One promising way to improve the efficiency of borehole heat exchangers (BHEs) in shallow geothermal applications is enhance thermal properties materials involved its construction. Early attempts, such as using metal tubes 1980s or utilization thin–foil hoses, did not succeed being adopted by market for diverse reasons (cost, corrosion, fragility, etc…). In parallel, optimization pipe size, use double-U-tubes, thermally enhanced grout, etc. were able bring measure BHE efficiency, resistance,...
In this numerical study, 4 types of hybrid nanofluid, including Ag-MgO/water, TiO2-Cu/water, Al2O3-CuO/water, and Fe3O4-multi-wall carbon nanotube/water, have been considered potential working fluid in a single U-tube borehole heat exchanger. The selected nanofluid is then analyzed by changing the volume fraction Reynolds number. Based on results, Ag-MgO/water chosen as most favorable carrier fluid, among others, considering its superior effectiveness, minor pressure drop, appropriate...
In this study, a laboratory-scale prototype of borehole field has been designed and built to assess various innovative grouting products in fully controlled environment. Three novel grout formulations are developed evaluated: enhanced grout, mixture microencapsulated phase change material, shape stabilized material. The objective is evaluate the enhancement their thermal properties (i.e., conductivity energy storage capacity) compared those using commercial reference grout. Besides,...
This article presents the experimental results from a unique laboratory test-setup used to comparative study of heat transfer conditions in borehole exchangers with different grouts under controlled environment. The work was part larger, EU-funded project on advanced materials for pipes and grout, GEOCOND. Four grout columns formulations were cast tested cyclic heating cooling. One column using high thermal conductivity grout; two microencapsulated phase change material (MC-PCM) one...
Thermal response test (TRT) is a common procedure for characterization of ground and borehole thermal properties needed the design shallow geothermal heat pump system. In order to investigate develop more accurate robust procedures TRT control, modelling, evaluation in semi-permeable soils with large water content, pilot exchanger was built main campus Universitat Politècnica de València. The present work shows results experiments performed at site, analysing improvements that have been...
In ground-source heat-pump systems, the heat exchange rate is influenced by various design and operational parameters that condition thermal performance of pump running costs during exploitation. One less-studied area relationship between pumping in a given system rate. This work analyzes investment operating representative borehole heat-exchanger configurations with varying circulating flow means combination analytical formulas case study simulations to allow precise quantification capital...
The design of ground source heat pumps is a fundamental step to ensure the high energy efficiency pump systems throughout their operating years. To enhance diffusion systems, two different tools are developed in H2020 research project named, “Cheap GSHPs”: A tool and decision support system. In both cases, demand buildings may not be calculated by user. main input data, evaluate size borehole exchangers, building demand. This paper presents methodology correlate demand, typologies, climatic...
In this contribution, we analyze the results of a number thermal response test (TRT) experiments performed during several years at same location our university campus in Valencia (Spain), permeable saturated soil area with possible groundwater flow conditions. A combination different heat injection rates, TRT operation times up to 32 days, and various methods for parameter estimation ground properties have been applied study their influence on result accuracy TRTs. Our main objective has...
The results of a large number Thermal Response Tests (TRTs) performed on four different borehole heat exchangers (BHEs) were analyzed to explore the effect novel grouting and plastic pipe materials developed in previous project their thermal performance. For this purpose, two versions composite two-region line source approach have been adapted for its use evaluating BHEs practical situations, allowing us obtain more comprehensive consistent information key parameters ground fillers. We...
The Adapted Conductivity Trilobular (ACT) design, comprising an up-flow central pipe and three satellite downward pipes, represents a novel configuration of borehole heat exchanger. novelty lies not only in the geometry exchanger, but also use materials perfectly adapted to thermal for which they have been specified. is constructed composite bilayer material with very low conductivity, whereas pipes are based on highly conductive plastic material. primary objective behind this design was...
To meet the stated climate change targets and to ensure capability of meeting current future energy demands, there is an urgent need develop renewable sources, such as geothermal systems. If systems are be cost-efficient enjoy public confidence, it essential that they designed installed in accordance with prevailing site-specific conditions. A thorough understanding thermal behaviour surrounding ground is, therefore, critical. In this work, we investigated temperature its evolution vicinity...
A research project was developed in Spain to undertake some studies on the geothermal use of pile foundations (PITERM PROJECT). The experiment consists a specifically designed, constructed and fully monitored precast driven at Polytechnic University Valencia. An important distinctive feature fact that it assembled from two identical sections connected with specific joint, by Rodio-Kronsa. This allows installation much longer piles into ground. is under types loads: mechanical thermal. load...
The paper describes the thermo-mechanical behaviour of an experimental pre-cast driven pile, properly instrumented and prepared to operate as a heat exchanger foundation element under simultaneous action mechanical thermal loads. Firstly, in situ static vertical load tests were carried out analyse pile behaviour. Afterwards, two performed constant load. first test was characterise pile–ground system. By means second test, conditions geothermal installation office building operating cooling...