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Dive into the research topics where Lars Reinholdt is active.

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Featured researches published by Lars Reinholdt.


Science and Technology for the Built Environment | 2015

Formulation and validation of a two-dimensional steady-state model of desiccant wheels

Lorenzo Bellemo; Brian Elmegaard; Martin Ryhl Kærn; Wiebke Brix Markussen; Lars Reinholdt

Desiccant wheels are rotary desiccant dehumidifiers used in air-conditioning and drying applications. The modeling of simultaneous heat and mass transfer in these components is crucial for estimating their performances, as well as for simulating and optimizing their implementation in complete systems. A steady-state two-dimensional model is formulated and implemented, aiming to obtain good accuracy and short computational times with the purpose of inclusion in complete system models. The model includes mass and energy balances and correlations for heat and mass transfer based on empirical relations from the scientific literature. Convective heat and mass transfer coefficients are computed locally accounting for the entrance length effects. Mass diffusion inside the desiccant material is neglected. Comparison with experimental data from the literature shows that the model reproduces the physical behavior of desiccant wheels satisfactorily, as the deviation between the computed results and available data is always within 12%. The simulation time is as low as 3 s for a model with 200 control volumes. It is found that for the applied case, the model provides accurate results for the overall flow using an equiangular control volume discretization with 200 control volumes and no axial discretization. More computationally expensive configurations with axial discretization give more accurate results and information on local flow and desiccant conditions inside the wheel.


International Journal of Refrigeration-revue Internationale Du Froid | 2015

Technical and economic working domains of industrial heat pumps: Part 2 – Ammonia-water hybrid absorption-compression heat pumps☆

Jonas Kjær Jensen; Torben Schmidt Ommen; Wiebke Brix Markussen; Lars Reinholdt; Brian Elmegaard


International Journal of Refrigeration-revue Internationale Du Froid | 2015

Technical and economic working domains of industrial heat pumps: Part 1 – Single stage vapour compression heat pumps ☆

Torben Schmidt Ommen; Jonas Kjær Jensen; Wiebke Brix Markussen; Lars Reinholdt; Brian Elmegaard


International Journal of Refrigeration-revue Internationale Du Froid | 2015

On the development of high temperature ammonia-water hybrid absorption-compression heat pumps

Jonas Kjær Jensen; Wiebke Brix Markussen; Lars Reinholdt; Brian Elmegaard


international journal of energy and environmental engineering | 2015

Exergoeconomic optimization of an ammonia–water hybrid absorption–compression heat pump for heat supply in a spray-drying facility

Jonas Kjær Jensen; Wiebke Brix Markussen; Lars Reinholdt; Brian Elmegaard


4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants | 2013

MODELING OF A REGENERATIVE INDIRECT EVAPORATIVE COOLER FOR A DESICCANT COOLING SYSTEM

Lorenzo Bellemo; Brian Elmegaard; Lars Reinholdt; Martin Ryhl Kærn


23rd IIR International Congress of Refrigeration | 2011

Thermoeconomic comparison of industrial heat pumps

Torben Schmidt Ommen; Christen Malte Markussen; Lars Reinholdt; Brian Elmegaard


International Sorption Heat Pump Conference (ISHPC 2014) | 2014

Investigation of ammonia/water hybrid absorption/compression heat pumps for heat supply temperatures above 100 °C

Jonas Kjær Jensen; Lars Reinholdt; Wiebke Brix Markussen; Brian Elmegaard


26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems | 2013

Modelling and analysis of a desiccant cooling system using the regenerative indirect evaporative cooling process

Lorenzo Bellemo; Brian Elmegaard; Lars Reinholdt; Martin Ryhl Kærn; Arne Jakobsen; Wiebke Brix Markussen


12th IIR Gustav Lorentzen Natural Working Fluids Conference (GL 2016) | 2016

High temperature absorption compression heat pump for industrial waste heat

Lars Reinholdt; B. Horntvedt; S. R. Nordtvedt; Brian Elmegaard; Jonas Kjær Jensen; Thor L. Lemminger

Collaboration


Dive into the Lars Reinholdt's collaboration.

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Brian Elmegaard

Technical University of Denmark

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Wiebke Brix Markussen

Technical University of Denmark

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Jonas Kjær Jensen

Technical University of Denmark

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Martin Ryhl Kærn

Technical University of Denmark

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Lorenzo Bellemo

Technical University of Denmark

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Torben Schmidt Ommen

Technical University of Denmark

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Benjamin Zühlsdorf

Technical University of Denmark

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Allan Schrøder Pedersen

Technical University of Denmark

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Arne Jakobsen

Technical University of Denmark

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