2026-04-19T15:44:55Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/3720212025-07-23T04:55:25Zcom_2072_1033col_2072_452951

Modeling and simulation of the heat storage of a solar district heating plant Vicente Rubí, Kilian Universitat Politècnica de Catalunya. Departament d'Enginyeria Química Danmarks tekniske universitet Fan, Jianhua Furbo, Simon Pérez González, Juan Jesús Àrees temàtiques de la UPC::Energies::Gestió de l'energia Heating from central stations -- Dronningmølle (Denmark) -- Design and construction Heating -- Storage -- Mathematical models Solar heating -- Equipment and supplies -- Evaluation Calefacció urbana -- Dronninglund (Dinamarca) -- Disseny i contrucció Calefacció -- Emmagatzematge -- Models matemàtics Calefacció solar -- Aparells i accessoris -- Avaluació The aim of this study is to evaluate the long term performance of the water pit heat storage of the Dronninglund solar district heating plant in Denmark, located in the peninsula of Jutland. Experimental storage data from 2017 is evaluated, including the charged and discharged energy, its efficiency, the diffusers outlet temperatures, envelope heat losses and many more. In addition, simulation of different models are carried out based on Type 1535 and 1301 elements of TRNSYS, developed by TESS. The objective of these simulations is to analyze not only the long term performance of the storage, but the accuracy that the results have compared with the actual data. The differences between models are the number of layers in which the storage is divided, changes in geometry or modifications in soil properties to study how these changes affect to the performance of the storage. The results show that the models simulate with a pretty high accuracy the outlet temperatures of the storage, especially the ones from the top and bottom diffusers. The actual charged and discharged energy of the year in question is 11868 MWh and 11250 MWh, respectively. The simulations show a high accuracy in terms of charged energy, with only a -3% deviation in the worst case. Although the discharged energy is not as accurate as the charged energy, the results are quite acceptable. Total heat losses of the real storage have a value of 1157 MWh. The results of all models are deviate significantly from the actual value, both overestimated and underestimated, but the possible reasons are explained throughout this report. However, the distribution of the different types of heat losses among all models results in about 65% of top losses, 33% of edge losses and 2% of bottom losses, except in the model where the soil properties are modified, with a different percentage distribution. The same applies for the efficiency of the storage, whose actual value is 90%. The simulated efficiency values are higher for the models that with lower heat losses and lower values for the model with higher heat losses with respect to the real tank, since they are dependent parameters between them. This study serves to draw some initial conclusions about how Type 1535 and Type 1301 perform as the water pit heat storage of Dronninglund Objectius de Desenvolupament Sostenible::11 - Ciutats i Comunitats Sostenibles Objectius de Desenvolupament Sostenible::7 - Energia Assequible i No Contaminant::7.2 - Per a 2030, augmentar substancialment el percentatge d’energia renovable en el con­junt de fonts d’energia 2022-05-03 Master thesis https://hdl.handle.net/2117/372021 ETSEIB-240.164761 eng http://creativecommons.org/licenses/by-nc-sa/3.0/es/ Open Access application/pdf east=10.289422; north=57.15836299999999; name=Rævdalsvej 1, 9330 Dronninglund, Dinamarca Universitat Politècnica de Catalunya