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A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields

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A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields

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dc.contributor.author Monzó Cárcel, Patricia María es_ES
dc.contributor.author Mogensen, Palne es_ES
dc.contributor.author Acuña, José es_ES
dc.contributor.author Ruiz Calvo, Félix es_ES
dc.contributor.author Montagud Montalvá, Carla Isabel es_ES
dc.date.accessioned 2015-06-03T07:20:36Z
dc.date.available 2015-06-03T07:20:36Z
dc.date.issued 2015-03-25
dc.identifier.issn 0375-6505
dc.identifier.uri http://hdl.handle.net/10251/51177
dc.description.abstract [EN] The design of a borehole field should be based on a long-term simulation of its thermal response for the intended energy loads. A well-known method to evaluate the response is based on a pre-calculated dimensionless function, the g-function. When calculating g-functions, there are two commonly used approaches for treating the boundary condition at the borehole wall: a constant heat flux at every instant of time, or a uniform temperature at a constant total heat flow to the borehole field. This paper is focused on a new approach to model the thermal process of borehole fields; in particular with a precise representation of a uniform temperature boundary condition at the borehole wall. The main purpose of this model is to be used as a research tool to either generate g-functions for particular cases or handle situations that cannot be addressed by others methods. First, the almost constant temperature along the borehole heat exchanger in operation requires a boundary condition of essentially isothermal boreholes along the depth. In a common case, the borehole heat exchangers are connected in parallel, thus all boreholes should have the same temperature. Also, the total heat flow to the borehole field should be constant over time. For this purpose, a numerical model in which the boreholes are filled with a hypothetical highly conductive material has been built, reproducing the isothermal condition. By thermally interconnecting the boreholes, the equal temperature condition is satisfied. Finally, the specified total heat flow is fed into one spot at the highly conductive material. The model is validated by generating g-functions of some simple borehole field configurations. The g-functions present, in general, a good agreement with the existing solutions for a similar boundary condition. Moreover, the model is also tested against real experimental data from a 2 × 3 borehole field at an office building. The simulated daily fluid temperatures are compared with measured daily fluid temperatures for the sixth year of operation. The simulated values present, in general, a good agreement with the measured data. The results show that there are no significant differences with regard to the boundary conditions at the borehole wall, which for this specific case is due to the fact that the system is thermally balanced. es_ES
dc.description.sponsorship The Seventh Research Framework Programme "Advanced ground source heat pump systems for heating and cooling in Mediterranean climates" Ground-Med TREN/FP7EN/218895 is acknowledged for partly supporting this project. The Swedish Research Council FORMAS and EFFSYS+ are also acknowledged for financing this research. en_EN
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof Geothermics es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Borehole es_ES
dc.subject G-function es_ES
dc.subject Long-term performance es_ES
dc.subject Uniform borehole temperature es_ES
dc.subject.classification MAQUINAS Y MOTORES TERMICOS es_ES
dc.title A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.geothermics.2015.03.003
dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/218895 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto de Ingeniería Energética - Institut d'Enginyeria Energètica es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada es_ES
dc.description.bibliographicCitation Monzó Cárcel, PM.; Mogensen, P.; Acuña, J.; Ruiz Calvo, F.; Montagud Montalvá, CI. (2015). A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields. Geothermics. 56:35-44. https://doi.org/10.1016/j.geothermics.2015.03.003 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.geothermics.2015.03.003 es_ES
dc.description.upvformatpinicio 35 es_ES
dc.description.upvformatpfin 44 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 56 es_ES
dc.relation.senia 285391
dc.contributor.funder European Commission


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