Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 19: Complex Systems

DY 19.1: Vortrag

Dienstag, 2. April 2019, 11:45–12:00, H6

Nodal modeling of a Vuilleumier refrigerator — •Raphael Paul, Abdellah Khodja, and Karl Heinz Hoffmann — Technische Universität Chemnitz, Institut für Physik, 09107 Chemnitz, Germany

Conventional cooling units of light and medium duty refrigerator trucks are commonly powered via the truck's electrical system, or by an auxiliary combustion engine. This raises the vehicle's overall fuel consumption and pollutant emissions. An innovative, sustainable approach to attenuate these disadvantages is to use a specially designed Vuilleumier refrigerator for mobile waste heat recovery. The aim is harnessing the residual exergy of the truck engine's exhaust gas for cargo cooling. In this contribution, a nodal simulation model is presented, which can be used for design optimization of a respective Vuilleumier refrigerator. The model is predicated on the concept of endoreversible thermodynamics. The bulk of the Vuilleumier machine is decomposed into a network of reversible subsystems with irreversible interactions. The formulation of conservation laws and interactions is based on fluxes of heat, mass, and enthalpy. The regenerators, however, are treated using a finite volume approach with central flux scheme. For an exemplary set of design parameters and operational conditions, preliminary simulation results and accordingly predictions for refrigerator performance measures are presented.