Thermodynamik kompakt

Köhler, Jürgen; Wolfersdorf, Jens von

doi:10.1007/978-3-642-37233-9

Cited by 12 publications

(20 citation statements)

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“…The time rate of change of entropy of a given system depends on the in-and outflow of entropy across the system's boundary and the entropy produced within the system (Weigand et al 2008):…”

Section: Second Law Of Thermodynamicsmentioning

confidence: 99%

“…The energy equation of such an open thermodynamic system in its general form (Weigand et al 2008) reads with the internal energy U, mass m, flow velocity u, gravitational acceleration g, specific enthalpy h, heat Q, pressure p, and chemical energy E chem . Thereby, the body volume U can be assumed to be constant, and the technical…”

Section: Energy Equation -First Law Of Thermodynamicsmentioning

confidence: 99%

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Assessment of physical activity of the human body considering the thermodynamic system

Hochstein

Rauschenberger

Siebert

et al. 2015

Computer Methods in Biomechanics and Biomedical Engineering

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Correctly dosed physical activity is the basis of a vital and healthy life, but the measurement of physical activity is certainly rather empirical resulting in limited individual and custom activity recommendations. Certainly, very accurate three-dimensional models of the cardiovascular system exist, however, requiring the numeric solution of the Navier-Stokes equations of the flow in blood vessels. These models are suitable for the research of cardiac diseases, but computationally very expensive. Direct measurements are expensive and often not applicable outside laboratories. This paper offers a new approach to assess physical activity using thermodynamical systems and its leading quantity of entropy production which is a compromise between computation time and precise prediction of pressure, volume, and flow variables in blood vessels. Based on a simplified (one-dimensional) model of the cardiovascular system of the human body, we develop and evaluate a setup calculating entropy production of the heart to determine the intensity of human physical activity in a more precise way than previous parameters, e.g. frequently used energy considerations. The knowledge resulting from the precise real-time physical activity provides the basis for an intelligent human-technology interaction allowing to steadily adjust the degree of physical activity according to the actual individual performance level and thus to improve training and activity recommendations.

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“…The time rate of change of entropy of a given system depends on the in-and outflow of entropy across the system's boundary and the entropy produced within the system (Weigand et al 2008):…”

Section: Second Law Of Thermodynamicsmentioning

confidence: 99%

Section: Energy Equation -First Law Of Thermodynamicsmentioning

confidence: 99%

Assessment of physical activity of the human body considering the thermodynamic system

Hochstein

Rauschenberger

Siebert

et al. 2015

Computer Methods in Biomechanics and Biomedical Engineering

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“…The two new parameters can be derived from the critical state of the fluid (Weigand et al, 2008). The internal pressure is defined using the cohension pressure parameter:…”

Section: 3384/ecp19157665mentioning

confidence: 99%

“…Assuming a constant amount of mass the total differential of the internal energy is (Weigand et al, 2008):…”

Section: Caloric Equation Of Statementioning

confidence: 99%

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Application of a Real Gas Model by Van-der-Waals for a Hydrogen Tank Filling Process

Kormann

Krüger

2019

Linköping Electronic Conference Proceedings

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Hydrogen fuel tanks operate at high system pressure levels. In these regions effects occur, which cannot be handled by an ideal gas model. One of these is the Joule-Thomson effect. It describes an adiabatic throttling without change in enthalpy, but a change in temperature. The tank filling process can be simplified to a throttling valve, so the effect is of interest. In this investigation the van der Waals equations are implemented in a real gas model for the Hydrogen Library and the Pneumatic Systems Library (PSL) by Dassault Systèmes and the model is applied to a hydrogen tank filling process. Performance and accuracy are compared to the CoolProp fluid properties library, which is imported with the ExternalMedia library.

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Heat Flows in Production Systems and its Modeling and Simulation

Kurle

2018

Sustainable Production, Life Cycle Engineering and Management

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Thermodynamik kompakt

Cited by 12 publications

References 0 publications

Assessment of physical activity of the human body considering the thermodynamic system

Assessment of physical activity of the human body considering the thermodynamic system

Application of a Real Gas Model by Van-der-Waals for a Hydrogen Tank Filling Process

Heat Flows in Production Systems and its Modeling and Simulation

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