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Papers by Ferdinand Schmidt

Verfahren zur Herstellung eines mit einer Zeolith-Schicht beschichteten Substrats

Adsorptionswärmepumpe mit Wärmespeicher

Adsorbens und dessen Verwendung in W?rmespeichern und W?rmepumpen

Method for production of a substrate coated with a zeolite layer

Boost in power density of adsorbers by zeolite coated metal fibres

ABSTRACT

Flow Analysis and Optimization of a Hierarchical Plate Heat Exchanger for an Adsorption Heat Pump

A generic adsorption heat pump model for system simulations in TRNSYS

Stratisorp: Neuartiges Schichtspeichersystem zur Effizienzsteigerung von Adsorptionswärmepumpen und-kältemaschinen

TECHNIK & INNOVATION-Effizienzsteigerung bei Gaswärmepumpen

Adsorption heat pump, adsorption refrigerator and adsorber elements therefor

Adsorber and its use in heat accumulators and heat pumps, or refrigerators

Renewable Energy, 2011

We present a comparison of solar thermal and solar electric cooling for a typical small office bu... more We present a comparison of solar thermal and solar electric cooling for a typical small office building exposed to two different European climates (Freiburg and Madrid). The investigation is based on load series for heating and cooling obtained previously from annual building simulations in TRNSYS. A conventional compression chiller is used as the reference system against which the solar options are evaluated with respect to primary energy savings and additional cost. A parametric study on collector and storage size is carried out for the solar thermal system to reach achieve the minimal cost per unit of primary energy saved. The simulated solar electric system consists of the reference system, equipped with a grid connected photovoltaic module, which can be varied in size. For cost comparison of the two systems, the electric grid is assumed to function as a cost-free storage. A method to include macroeconomic effects in the comparison is presented and discussed.

Transient modeling of an adsorber using finned-tube heat exchanger

International Journal of Heat and Mass Transfer, 2010

This paper presents a heat and mass transfer simulation of an adsorber, taking into consideration... more This paper presents a heat and mass transfer simulation of an adsorber, taking into consideration the geometry of the heat exchanger and the diffusion in the adsorbent medium. In this model, an increment in the direction of heating/cooling fluid containing one (or more) fin pitch was considered. In the domain of this increment, the distribution of the adsorbent temperature was

Estimating the Heat Capacity of the Adsorbate–Adsorbent System from Adsorption Equilibria Regarding Thermodynamic Consistency

Industrial & Engineering Chemistry Research, 2013

ABSTRACT The heat capacity of the adsorbate–adsorbent system is a crucial physical property requi... more ABSTRACT The heat capacity of the adsorbate–adsorbent system is a crucial physical property required for modeling adsorption cycles. It is specific to the considered adsorptive gas and to the corresponding adsorbent. In previous work, it has been shown that this heat capacity can be estimated using only the properties of the gaseous phase, the adsorption equilibria, and the isosteric heats of adsorption. As these quantities are required in any case for simulations, no additional effort arises. In this paper, the separated adsorbed phase heat capacities are computed at higher accuracies by employing reversible thermodynamic paths, which traverse equilibrium states only. As a result, the thermodynamic consistency of the model improves, since the residuals of the energy and entropy balances are significantly smaller. Results are given for the water–zeolite 13X adsorption pair.

Adsorption, 2011

An application of the original Dubinin-Radushkevitch equation modified with based on Polanyi theo... more An application of the original Dubinin-Radushkevitch equation modified with based on Polanyi theory, which taking into consideration the self-associating molecules in heterogeneous microporous structures at low and high uptake was presented. The Polanyi-Dubinin models were applied to predicting the behavior of water adsorption on Grace Silica Gel 127B at pressures not yet reported in the literature. The heat of adsorption, differential entropy, henry ratio was obtained from adsorption isotherm. The resulting extensions are experimentally and analytically presented. The coefficient of multiple correlation (R 2 ) between the thermogravimetric measurements and the MDR equation was 0.9924, which is 8.13% better than the best Dubinin-Astakhov fit.

Monte Carlo Investigations of the Water Adsorption Behavior in MFI Type Zeolites for different Si/Al Ratios with Regard to Heat Storage Applications

Adsorption, 2005

Adsorption processes are turning more and more important for heat transformation applications lik... more Adsorption processes are turning more and more important for heat transformation applications like thermally driven heat pumps and cooling cycles as well as heat storage. Standard adsorption materials have not been developed for these purposes. New materials are necessary in order to improve the adsorption characteristics for these applications. Molecular simulations are seen as a promising tool to investigate the influence of molecular structure on the adsorption characteristics and thus to provide means for future improvements of such materials for application in heat transformation.

Adsorption Heat Pump with Heat Accumulator