Space heating nowadays is the largest segment of household energy use in Europe. Novel designs on the side of the end users are crucial to reduce the overall emissions generated by this segment. The European standard EN 442:2014 delivers the disposition of European manufacturers to promote a reduction in the operative temperature of water radiators to improve the comfort and provide an efficient use of energy. Computational Fluid Dynamics is then used in the present work to generate a conjugate heat transfer simulation of the test room environment used for the testing of commercial metallic radiators and convectors, thus providing a computational implementation for preliminary evaluation and extrapolation of the performance of the system. A complete methodology for the construction and set up of the computational model, using as an input solely the geometry and properties of the device, is developed and presented in the present project work. The model results are also compared against the laboratory results of the thermal output assessment of a reference radiator model tested according to the standard EN 442-2. The present document starts with an introductory chapter that encourages the reader into the topic by highlighting the importance of space heating energy use, more specifically the relevance of more efficient designs on the side of the end-users. The radiator laboratory test methodology is explained to the reader and the scope of the work is defined. Chapter 2 focuses on the problem description in terms of the physical phenomena to be analyzed, the testing environment, the conjugate heat transfer problem and the role of radiative heat transfer. Chapter 3 deals with the methodology developed for the generation of the computational model, starting from the raw single unit 3D model used as the input, until the numerical set up of the problem. Detailed results of the model are presented in Chapter 4, where the model is compared against the laboratory results of the thermal output of the radiator. Finally, the conclusions of the project work are drawn and summarized to the reader.
Il riscaldamento degli ambienti al giorno d'oggi è il più grande segmento di consumo di energia domestica in Europa. Nuovi progetti innovativi sono fondamentali per ridurre le emissioni complessive generate da questo segmento. La norma europea EN 442: 2014 offre la disposizione dei produttori europei per promuovere una riduzione della temperatura operativa dei radiatori ad acqua per migliorare il comfort e fornire un uso efficiente dell'energia. La fluidodinamica computazionale viene quindi utilizzata nel presente lavoro per generare una simulazione del trasferimento di calore coniugato dell'ambiente della sala prove utilizzata per il collaudo di radiatori e convettori metallici commerciali, fornendo così un'implementazione computazionale per la valutazione preliminare e l'estrapolazione delle prestazioni del sistema. Una metodologia completa per la costruzione e l'impostazione del modello computazionale, utilizzando come input esclusivamente la geometria e le proprietà del dispositivo, viene sviluppata e presentata nel presente lavoro di progetto. I risultati del modello vengono inoltre confrontati con i risultati di laboratorio della valutazione della potenza termica di un modello di radiatore di riferimento testato secondo la norma EN 442-2.
Numerical analysis of a household radiator test room
PACHÓN MEDINA, IVÁN FELIPE
2018/2019
Abstract
Space heating nowadays is the largest segment of household energy use in Europe. Novel designs on the side of the end users are crucial to reduce the overall emissions generated by this segment. The European standard EN 442:2014 delivers the disposition of European manufacturers to promote a reduction in the operative temperature of water radiators to improve the comfort and provide an efficient use of energy. Computational Fluid Dynamics is then used in the present work to generate a conjugate heat transfer simulation of the test room environment used for the testing of commercial metallic radiators and convectors, thus providing a computational implementation for preliminary evaluation and extrapolation of the performance of the system. A complete methodology for the construction and set up of the computational model, using as an input solely the geometry and properties of the device, is developed and presented in the present project work. The model results are also compared against the laboratory results of the thermal output assessment of a reference radiator model tested according to the standard EN 442-2. The present document starts with an introductory chapter that encourages the reader into the topic by highlighting the importance of space heating energy use, more specifically the relevance of more efficient designs on the side of the end-users. The radiator laboratory test methodology is explained to the reader and the scope of the work is defined. Chapter 2 focuses on the problem description in terms of the physical phenomena to be analyzed, the testing environment, the conjugate heat transfer problem and the role of radiative heat transfer. Chapter 3 deals with the methodology developed for the generation of the computational model, starting from the raw single unit 3D model used as the input, until the numerical set up of the problem. Detailed results of the model are presented in Chapter 4, where the model is compared against the laboratory results of the thermal output of the radiator. Finally, the conclusions of the project work are drawn and summarized to the reader.| File | Dimensione | Formato | |
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https://hdl.handle.net/10589/152637