The Modelica Thermal Model Generation Tool for Automated Creation of a Coupled Airflow, Radiation Model and Wall Model in Modelica

Pathak, Arnav; Norrefeldt, Victor; Lemouedda, A.; Grün, Gunnar

doi:10.3384/ecp14096115

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…The zonal model is created using the Indoor Environment Simulation Suite (IESS) [5]. The goal of this tool chain is to allow the user to create a geometrically correct zonal model for complex geometries.…”

Section: Model Approachmentioning

confidence: 99%

Coupling of a zonal air and temperature distribution model with an low pressure environmental control system ducting model

Matheis,

Korth,

Norrefeldt

et al. 2023

J. Phys.: Conf. Ser.

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The Regional Cabin Demonstrator is developed within the Clean Sky 2 project and integrates the latest developments in sustainable and high-performance cabin interiors for enhanced passenger experience. Within this project, an innovative low pressure environmental control system (ECS) ducting is developed and integrated into the demonstrator. Together with these hardware demonstration efforts, the associated model based development capabilities are strengthened. The goal is to virtually design the aircraft prior to its actual hardware integration. Such integration requires heterogeneous submodels interaction in an overall aircraft model. The current work presents such a model coupling. On the one hand, a component database for 1D system simulation is developed. By connecting these parameterized component models, it is possible to build any desired low pressure ECS system for which the pressure drop and the air outlet flow distributions are calculated. This system model is interfaced with a zonally decomposed indoor environment Modelica-model of the Regional Cabin Demonstrator showing resulting cabin air temperature, stratification and airflow. Both models interact on the one hand because the air temperature and distribution in the air outlets generates a boundary condition for the zonal model. On the other hand, part of the cabin exhaust air is recirculated and thus generates a boundary condition for the low pressure ECS model. The coupling is performed by the functional mock-up (FMU) standard allowing to couple different models through standardized in- and outputs while maintaining protection of individual partners’ IP. The model application is demonstrated on the example of a cruise condition thermal boundary condition.

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Section: Model Approachmentioning

confidence: 99%

Coupling of a zonal air and temperature distribution model with an low pressure environmental control system ducting model

Matheis,

Korth,

Norrefeldt

et al. 2023

J. Phys.: Conf. Ser.

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“…The model is created with the use of the Thermal Model Generation Tool [3]. For this purpose, the geometry is drawn in a 3D-drawing software and is exported in form of .stl-files.…”

Section: Model Developmentmentioning

confidence: 99%

“…The model contains 255 zones in total. The Modelica source code automatically generated by the Thermal Model Generation Tool [3] developed at the Fraunhofer IBP contains the properties and connections of the individual, neighbouring zones through its flow paths [6].…”

Section: Model Developmentmentioning

confidence: 99%

Heat and species map prediction for the generic MEA using an air node model derived from high level requirements

Matheis

Norrefeldt

2023

J. Phys.: Conf. Ser.

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Current developments to implement the More Electric Aircraft (MEA) result in a fundamental change of the aircraft systems architecture. Components may be resized or new components may be introduced. This results in new challenges for the thermal management and safety assessment of systems and therefore parametric and fast simulations tools will become crucial to explore the entire design space. The effects of component heat dissipation on airflow in the aircraft fuselage can be qualified using a zonal simulation model. Zonal airflow models subdivide the indoor space into typically 102 zones exchanging air. This allows to predict the impact of systems locations, ventilation and cooling strategies on the thermal management and safety considerations in an early design stage. This paper presents the setup of such an aircraft zonal model based on high-level requirements for a MEA of regional airplane size. These requirements cover the number of passengers, the flight profile and system components to be integrated, like e.g. the battery. Additional requirements are derived from standards for example providing information on required airflow rates and temperatures in the cabin. These requirements are translated into a geometry, ventilation pattern and systems layout. The model application is demonstrated on the example of the safety consideration in case of a battery failure leading to exhaust of harmful gas. This is done by comparing the gas dispersion for two different battery positions in the aircraft.

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“…The IESS Model Generator is a pre-processing tool developed in C++. It translates a CAD model exported into the .stl format to Modelica code that can be simulated in the Modelica simulation environment [6]. This tool automatically distributes the zonal grid, attributes the adjacencies of zones and walls and provides top-level parameters such as source intensities, exterior temperature, etc., for easy model customization.…”

Section: Iess Model Generatormentioning

confidence: 99%

Validation of a Simulation Tool for an Environmentally Friendly Aircraft Cargo Fire Protection System

Pathak¹,

Norrefeldt²,

Pschirer³

2021

Aerospace

Self Cite

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One of the objectives of the CleanSky-2 project is to develop an Environmentally Friendly Fire Protection (EFFP) system to substitute halon for the aircraft cargo hold. For this, an aircraft demonstrator including the cargo hold was equipped with a nitrogen-based fire suppression system. The demonstrator is located in the Flight Test Facility (FTF) low-pressure vessel and can thus be subjected to realistic cruise pressure conditions and take-off and descent pressure profiles. As a design tool, a zonally refined simulation model to predict the local oxygen and nitrogen concentration distribution in the cargo hold has been developed using the Indoor Environment Simulation Suite (IESS). The model allows for fast transient simulations of the suppression system operation. This paper presents a model validation case of knockdown during cruising, followed by a holding phase and descent.

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The Modelica Thermal Model Generation Tool for Automated Creation of a Coupled Airflow, Radiation Model and Wall Model in Modelica

Cited by 7 publications

References 6 publications

Coupling of a zonal air and temperature distribution model with an low pressure environmental control system ducting model

Coupling of a zonal air and temperature distribution model with an low pressure environmental control system ducting model

Heat and species map prediction for the generic MEA using an air node model derived from high level requirements

Validation of a Simulation Tool for an Environmentally Friendly Aircraft Cargo Fire Protection System

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