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Dynamic modelling of gas-fired condensing boiler units for the use in residential buildings
Residential buildings claim a large share of the total energy use in the European Union (EU). In residential buildings, the biggest energy users are systems for supplying space heating and domestic hot water demand. According to the official assessments issued by the institutions of the EU, gas-fired boiler units are dominating the coverage of space heating and domestic hot water demand of the residential dwellings across the continent. Currently, increased attention is paid to the energy performance assessment through transient detailed modelling simulations. However, most of the existing numerical models are case-specific with poor reusability based on fitted efficiencies. Moreover, most of these models are usually dependent on a large number of hardly accessible design characteristics of the units. In this paper, a full thermodynamic analysis has been conducted on a simultaneous condensing and non-condensing gas-fired boiler unit with the use of limited open-source input data, which are given in the list of characteristics of these units issued by the relevant manufacturers. The numerical model is programmed in the programming language Modelica and simulated in the Dymola software environment. The combustion model relies on the fixed natural gas fuel intake with the known composition which combusts into a stable mixture of combustion gases. In the main heat exchanger, the heat transfer process occurs from the combustion gases to the circulating water, which is further coupled to the building system. If the return water temperature of the unit is lower than the dew point temperature of the combustion gases, a certain amount of water condensate can be formed out of the water vapor contained within the combustion gases. This process results in higher efficiencies typical for condensing boilers. The goal of this research is to develop an easily parametrized, thermodynamically consistent dynamic gas-fired heating boiler model and inspect the influence of modelling the varying input parameters on its performance. ...
Dynamic modelling of gas-fired condensing boiler units for the use in residential buildings
Residential buildings claim a large share of the total energy use in the European Union (EU). In residential buildings, the biggest energy users are systems for supplying space heating and domestic hot water demand. According to the official assessments issued by the institutions of the EU, gas-fired boiler units are dominating the coverage of space heating and domestic hot water demand of the residential dwellings across the continent. Currently, increased attention is paid to the energy performance assessment through transient detailed modelling simulations. However, most of the existing numerical models are case-specific with poor reusability based on fitted efficiencies. Moreover, most of these models are usually dependent on a large number of hardly accessible design characteristics of the units. In this paper, a full thermodynamic analysis has been conducted on a simultaneous condensing and non-condensing gas-fired boiler unit with the use of limited open-source input data, which are given in the list of characteristics of these units issued by the relevant manufacturers. The numerical model is programmed in the programming language Modelica and simulated in the Dymola software environment. The combustion model relies on the fixed natural gas fuel intake with the known composition which combusts into a stable mixture of combustion gases. In the main heat exchanger, the heat transfer process occurs from the combustion gases to the circulating water, which is further coupled to the building system. If the return water temperature of the unit is lower than the dew point temperature of the combustion gases, a certain amount of water condensate can be formed out of the water vapor contained within the combustion gases. This process results in higher efficiencies typical for condensing boilers. The goal of this research is to develop an easily parametrized, thermodynamically consistent dynamic gas-fired heating boiler model and inspect the influence of modelling the varying input parameters on its performance. ...
Dynamic modelling of gas-fired condensing boiler units for the use in residential buildings
Simić, Katarina (author) / T'Jollyn, Ilya (author) / Faes, Willem (author) / Borrajo Bastero, Josué (author) / Laverge, Jelle (author) / De Paepe, Michel (author) / Meyer, Josua
2021-01-01
Proceedings of the 15th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT2021) ; ISBN: 9781775922162
Conference paper
Electronic Resource
English
DDC:
690
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