DescriptionToday's environmental, climate and energy policies have the goal of limiting the amount of greenhouse gases and carbon that is emitted by the conventional energy resources (oil, gas, coal) by making a transition to the renewable energies and by aiming at an increased energy efficiency. For this reason, they target the use of cost-, space- and energy-efficient heat storage technologies, a target that can be fulfilled by the thermo-chemical systems. Sorption thermal energy storage (STES), being an important part of the thermo-chemical systems class, poses as a promising alternative, principally for applications at a low-medium temperature (below 130 C). Sorption materials (like zeolite and silica gel) have the ability to store heat at low temperature level, and in a dry state, they will keep the energy stored as long as there is no water contact, regardless the surrounding temperature. This feature makes them a perfect solution for seasonal storage systems, which is the focus of this work. The main goal of this thesis is to create and implement a mathematical model of a sorption storage reactor that uses zeolite as sorption material and air as heat transfer medium and integrate it to a domestic system. The model was developed using MATLAB and Simulink and was validated by comparison with a similar model developed at the Institute für Thermodynamik und Wärmetechnik - Stuttgart (ITW). As a further step, a new system containing a passive house, a solar thermal air collector and the sorption storage system developed here, was created. The passive house model was extracted from the Carnot block-set in MATLAB and for the solar thermal collector, a Simulink model of an evacuated tube collector, using air as medium, was developed. The setup has the objective of investigating the applicability of the sorption system in a real life situation. To do so, four dierent days throughout the year, one representative for each season, were chosen to test the arrangement's behaviour. This thesis will explain in detail how the mathematical model, as well as all the other Simulink models, were created, implemented and tested, additionally including a description of the equations used. The final results achieved with the systems created here and modelled were satisfactory and will also be presented and explained in this work, alongside with further improvements that can be made in the systems.
|Period||5 Mar 2020|
|Event title||World Sustainable Energy Days: null|