Impact of groundwater flow on thermal energy storage and. Basimo borehole heat exchanger array simulation and. Numerical modeling of borehole heat exchangers bhes and its. The superc deep borehole heat exchanger is composed of a deep borehole with an inner coaxial pipe further referred to as standpipe. Thermal efficiency of the borehole heat exchanger built with drilling mud. Dhts are used for geothermal heating, sometimes with the help of a geothermal heat pump. Numerical simulation of a freezethaw testing procedure for borehole heat exchanger grouts. Keywords ground source heat pump system, borehole heat exchanger, thermal response test, groundwater flow, intermittent operation strategy introduction ground source heat pump gshp systems have been rapidly developed as highly efficient energy technology for the heating and cooling of buildings in the past few decades blum et al. If the borehole is permeable than the aquitard k f i l l k. Numerical modelling of geothermal borehole heat exchanger systems iii acknowledgements i would like to express my deepest gratitude to my first supervisor, dr. Finite element formulation for borehole heat exchangers in modeling geotherj.
The calibrated model established a basis for optimising the btes operation in terms of the lengths of the charging and discharging cycles and the. A borehole heat exchanger was added, modeled as a cylinder with a diameter d, hydraulic conductivity k f i l l, crossing all model layers. Study of the sustainability of a ground source heat pump system by. Xchanger suite is software for the rating, simulation, andor design of a wide variety of heat transfer equipment. The acquired information was used to set up and calibrate the numerical model of heat transfer in the software feflow. Below are some of the tools and information we use on a routine basis.
Geothermics is one building block within the suite of alternative lowcarbon, sustainable and renewable energy technology. Videos related to feflow finite element subsurface flow and transport simulation system feflow is one of the most sophisticated groundwater and porousmedi. Thermal effect of a borehole thermal energy store on the subsurface. Apr 26, 2020 heat exchanger software and engineering tools, shell and tube, condenser design, kettle reboiler, plate heat exchanger, double pipe heat exchanger. Aug 08, 20 tutorial for the groundwater simulation software feflow, referring to the tutorial in the user manual that can be downloaded from. Tutorial for the groundwater simulation software feflow, referring to the tutorial in the user manual that can be downloaded from feflow. This tutorial demonstrates how to design a commercial vertical heat exchanger system with the ground loop design software. Pdf a matlab toolbox for optimization of deep borehole heat. Research open access thermal effect of a borehole thermal. The number of gfunctions had to be increased considerably to allow this feature, and gfunctions for smaller distances had to be added. High temperature borehole thermal energy storage the proposed system of a mdbtes 5 consists of multiple boreholes with depths of 100 m a 1,000 m. The heat exchanger may be composed of any number of boreholes arranged in various configurations. Aug 08, 2015 the thermal process was simulated using the finite element method fem groundwater, heat, and mass modeling software feflow.
Therefore, we simulated the operation of a heat exchanger by setting a12 hourcycle operation running from 6. A system of 25 double ushape borehole heat exchangers bhes in longterm operation and three scenarios were created. While glhepro may be used for residential system design, it is aimed at commercial systems. The thermal resistance of a borehole can be reduced by employing thermally enhanced grout, increasing the surface area of the loop and locating the legs proximal to the bore wall. Coaxial borehole heat exchangers bhe are implemented in the boreholes. A downhole heat exchanger, dhe also called a borehole heat exchanger, bhe is a heat exchanger installed inside a borehole. Aquifer thermal energy storage ates heat transport in porous and fractured media under saturated and unsaturated conditions. The bhe interconnection editor allows the definition of bhe arrays with parallel or serial interconnection of the single borehole heat exchangers. There exists many different tools used to design, size and rate heat exchangers. The thermal process was simulated using the finite element method fem groundwater, heat, and mass modeling software feflow. Aquifer thermal energy storage ates heat transport in porous and fractured. Simon rees, for his inspiring guidance and encouragement through my work and for the invaluable influence he has made in my academic life.
Setting up both openloop and closedloop borehole heat exchanger geothermal systems usage of the openloop design plugin for system design result evaluation. The developed simulation software is an addon to the finite element flow and. How to design a vertical borehole heat exchanger youtube. Optimisation of experimental operation of borehole thermal. A common application is the storage of heat from a combined heat and power plant or the capture of solar heat in summer for later use in winter. Canadian geotechnical journal canadian science publishing. The depth of the boreholes usually varies between 40 and 200 m, and the diameter between 75 and 150 mm. Sep 23, 2009 this tutorial demonstrates how to design a commercial vertical heat exchanger system with the ground loop design software. Typical applications feflow is the ideal software for.
It is used to capture or dissipate heat to or from the ground. If you need asme uhx and tema mechanical design calculations, drawings and reports then the compress heat exchanger option is for you. While running the heat exchanger, a constant heat extraction of about 4. Determines the preliminary size for a shell and tube heat exchanger based on the process information provided. Modeling borehole heat exchanger systems feflow yumpu. The borehole heat exchanger bhe is used to simulate closedloop geothermal installations. The temperature difference between outlet temperature and inlet temperature was set at 2 deg. Pest, developed by john doherty, is the industry standard software package for parameter estimation and uncertainty analysis of complex environmental and other numerical models. What is your idea for modeling ground sectionouter section and boreholeunderground heat. Typical application of a borehole heat exchanger bhe heat pump hp system in a central european home. With fepest, the feflow package now features a graphical user interface for easy integration of your feflow models into the pest framework. Heat pumps combined with vertical borehole heat exchangers bhe use the ground as a heat source or sink for the purpose of heating or cooling of buildings. The town of penzlau is situated in an area with a positive geothermal anomaly, and the borehole heat exchanger in penzlau is described by schneider et al.
Groundwater flow and heat transport simulation using feflow with detailed facies analysis in aizu basin, fukushima, japan. A btes is an underground heat exchanger system used to store large quantities of excess heat. In this work, we present the results of a series of simulations of a double upipe borehole heat exchanger, carried out with the finiteelement flow and heat transport modelling software feflow to. Masatoshi yamaguchi, kiichi numazawa, masahiko katsuragi. In the heating installation, the existing geothermal borehole was used. The surrounding rock is utilized as a heat storage, the cementation and borehole wall function as heat exchanger.
Thermal efficiency of the borehole heat exchanger built with. Cosimulation of geothermal applications and hvac systems. Thermal resistance of borehole heat exchangers composed of. It is called as a tool from the boreholeheat exchanger toolbar. Thermal models that are used to predict borehole heat exchange are characterized by either simplified formulations that are restrictive in their application, but utilitarian, or complex multidimensional analyses. A heat exchanger usually consists of one or two ushaped pipes.
Numerical modelling of geothermal borehole heat exchanger. However, up until now, the program could not yet simulate. In order to predict the heat transfer within borehole heat exchangers. Pcprograms and modelling for borehole heat exchanger design.
Water free fulltext can borehole heat exchangers trigger. Seasonal high temperature heat storage with medium deep. Thermal efficiency of the borehole heat exchanger built. Feflow software is applied in this study to solve the moistureheat. Feflow is applicable for a multitude of groundwater, porous media and heat transport projects from local to regional scale.
A further limitation is that most bhe design software used by industry assume a closed box approach discounting the heat transport inout by the groundwater flow. Study of the sustainability of a ground source heat pump. Borehole heat exchangers bhe heat exchanger arrays. Feflow tutorial simulating borehole heat exchangers youtube. Borehole heat exchanger bhe borehole heat exchangers bhe in connection with heat pumps and floor heating in many countries are becoming an alternative to conventional heating or cooling systems using fossil resources. Glhepro was developed as an aid in the design of vertical boreholetype ground loop heat exchangers used in geothermal heat pump systems. Rosen2, andrzej gonet1, tomasz sliwa1 mailing address, 1agh university of science and technology. Model simulation allows to present the timevarying temperature distribution of the ground source for heat pumps. Eed borehole and heat exchanger menu with selection of gfunction example. Borehole heatexchanger wellfields vertical borehole heatexchanger bhe wellfields can be used virtually regardless of the geology and groundwater conditions.
With appropriate borehole conductances so coupled model is capable to cope with laminar, turbulent and transitory conditions in the pipes. Coaxial borehole heat exchanger comsol multiphysics. Feflow enables you to model all relevant components of heat transport processes. Both horizontal and vertical heat exchangers can be modeled. To efficiently model grids of multiple bhes, feflow 6 and the integrated bhe solution is used. Allthough thermal properties vary with strata and have their influence on borehole spacing and wellfield geometry, factors such as building energy requirements and heating and cooling. Htri offers a wide range of software solutions for heat transfer equipment used by operating companies, engineering contractors, exchanger fabricators, and related industries. Validating a high resolution numerical model of a borehole.
Diersch and others published finite element formulation for borehole heat exchangers in modeling geothermal heating systems by feflow find. Pdf sensitivity analysis on the performance of a ground. Due to the implementation as a tool all other feflow functions can be used while the dialog is open. A matlab toolbox for optimization of deep borehole heat exchanger storage systems. A matlab toolbox for optimization of deep borehole heat.
Feflow online training get most out of feflow without leaving your office. Thermal modelling and evaluation of borehole heat transfer. Design of ground source heat pump systems thermal modelling and evaluation of boreholes. Design calculations for optimising of a deep borehole heat. Design of ground source heat pump systems thermal modelling and. The software calculates the heating and cooling energy demand of a given building on a monthly basis similar to the german calculation method used for demand based energy cer. Heat exchanger software webbusterz engineering software. Feflow is a common software solution for thermohydraulic coupled groundwater applications with mass transport, as well as geothermal applications. The same solution is used in the commercial software feflow 19, but has. Up to eight design conditions can be investigated for fixed, utube, kettle and floating tubesheet style exchangers. Heat transport in porous and fractured media under saturated and unsaturated conditions. Glhepro was developed as an aid in the design of vertical borehole type ground loop heat exchangers used in geothermal heat pump systems.
The feflow fh3 modules allow you to model a multitude of different applications involving fluid flow and heat transport processes, including dewatering and seepage analysis, recharge and extraction, and geothermal applications. Conference on sustainable refrigeration and heat pump technology, stockholm, 2009 1. This is a software tool that allows the design of vertical borehole heat exchanger bhe fields used for heating and cooling of office buildings. Analysis of borehole heat exchanger in an existing ground. Box 118, s22100 lund, sweden 2 institute of applied geosciences, justusliebiguniversity diezstrasse 15, d35390 giessen, germany abstract. Finite element modeling of geothermal source of heat pump. The required heat transfer area, the number of tubes and the shell size are. Jun 17, 2015 the thermal resistance of a borehole can be reduced by employing thermally enhanced grout, increasing the surface area of the loop and locating the legs proximal to the bore wall. Asme uhx and tema heat exchanger software codeware. Tutorial for the groundwater simulation software feflow, referring to the tutorial in the user manual that can be downloaded from. Thermal models that are used to predict borehole heat exchange are characterized by either simplified formulations that are restrictive in their application, but utilitarian, or complex multidimensional. Numerical modeling of borehole heat exchangers bhes and. Performance evaluation of borehole heat exchanger in.
The project is focusing on the heat transfer from the ground to the boreholes modelled using finite line source fls based generated gfunctions. In these scenarios, the difference between balanced and nonbalanced energy load was considered as well as the influence of the hydrogeological factors on the. Nov 01, 2016 the heat supplied to the btes was internally calculated in feflow from the measured values of the flux, specific heat capacity, and density of the htf and the temperature difference between the inlet and outlet of the heat exchanger. Design sizing the design of bhehp systems aims at the appropriate sizing of the system components by taking into account a number of influence factors. Thermal response testing of a multiple borehole ground heat exchanger. Finite element formulation for borehole heat exchangers in modeling. Heat transfer in borehole heat exchangers from laminar to. In return, the analytical solution sets heat sources based on the thermal resistances within the bhes and the difference between the borehole wall temperature and the calculated bhe fluid temperature at the corresponding nodes see above. Surface and groundwater courses from the academy by dhi.
Proceedings of 9th international conference on sustainable energy technologies set 2010, shanghai, china. Ground loop heat exchanger design software building. Modelling geothermal energy and heat transport processes. Btes consists of multiple arranged and interconnected borehole heat exchangers bhes in. Royal institute of technology, brinellvagen 68, stockholm, 100 44, sweden. Feflow provides an application programmers interface api which allows you to automatize workflows. Feflow 2009, september 1418, 2009, potsdamberlin, germany 2 content 1. Hi friends i want to model an underground heat exchanger. Borehole heat exchanger cfd online discussion forums. Feflow tutorial simulating borehole heat exchangers. Mike powered by dhis software seminar conducted by dhi brazil. Principle of the socketclient connection between feflow and simulink. Bhes are represented as embedded 1d elements and linked to the feflow nodes along join edges or edges in a 3d model.
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