Adsorption thermal energy storage for cogeneration in industrial batch processes: Experiment, dynamic modeling and system analysis

Schreiber, Horst; Graf, Stefan Wilhelm; Lanzerath, Franz; Bardow, André

doi:10.1016/j.applthermaleng.2015.06.016

Cited by 40 publications

(22 citation statements)

References 28 publications

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“…Adsorption-based energy systems can provide efficient heating and cooling by using low temperature solar or waste heat sources [1,2]. Possible applications include adsorption-based storage [3], heat pumps [4] and chillers [5]. Besides improving efficiency, current research aims at increasing the specific cooling power (SCP).…”

Section: Introductionmentioning

confidence: 99%

The impact of filling level resolved: Capillary-assisted evaporation of water for adsorption heat pumps

Lanzerath

Seiler

Erdogan

et al. 2016

Applied Thermal Engineering

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Evaporation of water at low pressures is usually limited by low heat transfer coefficients. Poor heat transfer can severely restrict the performance of cooling devices such as adsorption heat pumps and chillers. The heat transfer can be enhanced by using structures such as fins and porous coatings. These structures provide capillary action to wet the heat exchanger tubes surface with a thin water film leading to high heat transfer coefficients. Hence, the evaporation performance strongly depends on the thickness of the thin water film and consequently on the filling level of the heat exchanger. In this work, the evaporation performance is investigated systematically for horizontal copper tubes with macroscopic fin structures, microporous coatings and the combination of both structures. In particular, an experimental setup is introduced to study continuously varying filling levels. The influence of evaporation temperature and heat flow on the heat transfer coefficient is studied. The heat transfer is found to depend strongly on the filling level and the temperature, whereas the heat flow has no significant influence at the studied measurement conditions. It is shown that the heat transfer is directly proportional to the tube surface wetted by capillary action. The evaporation performance of thermally-coated tubes can reach heat transfer coefficients similar to falling film evaporators. Thus, the presented tube structures allow for improved evaporator designs for future adsorption heat pumps using water as refrigerant.

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Section: Introductionmentioning

confidence: 99%

The impact of filling level resolved: Capillary-assisted evaporation of water for adsorption heat pumps

Lanzerath

Seiler

Erdogan

et al. 2016

Applied Thermal Engineering

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“…Schreiber et al [31] developed a laboratory-scale closed heat storage unit with zeolite 13X and water as the adsorption pair suitable for cogeneration in industrial batch processes (i.e., brewery). The design of the storage unit is similar to that of the MODESTORE prototype, since the absorber and evaporator/condenser unit are integrated into a single container (Figure 8) without valves in between.…”

Section: Advancements In Energy Storage Technologiesmentioning

confidence: 99%

“…The system has been installed in an internal combustion engine locomotive for producing chilled water for air conditioning the driver's cab. In contrast to the previously mentioned closed system with zeolite-H 2 O working pair [31], the evaporator and condenser are separate units, since the evaporator is used to absorb heat from the cabin (Figure 9). During charging, the adsorbent bed is heated by the locomotive's internal combustion engine exhaust gasses, while ambient air is used to cool the condenser and the adsorber Figure 8.…”

Section: Advancements In Energy Storage Technologiesmentioning

confidence: 99%

Technologies for Seasonal Solar Energy Storage in Buildings

Stritih¹,

Mlakar²

2018

Advancements in Energy Storage Technologies

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Thermochemical heat storage is a very promising technology that enables us to save the excess heat produced during summer time for the needs in the winter, when we have higher heating needs. Thermochemical heat storage bases and an overview of thermochemical materials (TCMs), suitable for the solar energy storage, are given. Choosing a suitable adsorbent and adsorbate is very important. The most important properties of the substance are high energy density for high thermal storage, low charging temperature for low energy consumption, high uptake of sorbate kg(sorbate)/kg(sorbent) and environmental safety and easy to handle-nonpoisonous. The paper also presents the differences between the closed and the open sorption system. The biggest difference between those two systems is the importance of sorbent, which in case of open systems means that sorbent must be environmentally friendly. Also, various closed and open systems are presented.

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“…The efficient implementation of renewable energy sources necessitates both electrical and thermal energy storages (TES). For domestic as well as industrial applications, TESs based on closed adsorption are studied, e. g. [1,2]. To date most publications focus on packed-bed adsorbers with adsorbent pellets or powder filling.…”

Section: Motivation and Subject Mattermentioning

confidence: 99%

Simulation of a closed low-pressure honeycomb adsorber for thermal energy storage

Schaefer

Thess

2018

International Journal of Heat and Mass Transfer

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The efficient implementation of renewable energy sources necessitates thermal energy storages. For domestic as well as industrial applications thermal energy storages based on closed adsorption are studied. Against this background, a closed low-pressure honeycomb adsorber is numerically examined in this work. The examined adsorber contains stacked layers of honeycomb blocks with rectangular channels which are separated by heat exchanger plates. Zeolite 13X and water is assumed as the adsorption pair. The focus of this work is solely on the adsorption process. The numerical model applies an one-dimensional model for the single channels of the honeycomb blocks. The one-dimensional model has been presented in a previous work of the authors. To account for transversal heat conduction in the honeycomb cross-section, the one-dimensional model equations are extended by heat source/sink terms. In addition, the mass transport equation is modified for rectangular channel flow. The results demonstrate that the heat and mass transfer and the adsorption processes are strongly coupled and can be only understood by their interaction. Regarding modelling aspects, it is found that the spatial variations of temperature and pressure as well as the local deviation from adsorption equilibrium are significant. Hence, no equilibrium assumptions should be made. Further, the minor rarefaction effect of slip should be considered. With respect to the application, the analysis yields that the thermal power can be optimized by variation of the honeycomb geometry parameters, e. g. channel size. The local optimum is a result of the inverse dependencies of the external and internal mass transfer resistance on the channel size. Interestingly, the optimum for peak and mean power do not coincide in general. Finally, it is found that the thermal power can be controlled effectively by the inlet pressure.

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Adsorption thermal energy storage for cogeneration in industrial batch processes: Experiment, dynamic modeling and system analysis

Cited by 40 publications

References 28 publications

The impact of filling level resolved: Capillary-assisted evaporation of water for adsorption heat pumps

The impact of filling level resolved: Capillary-assisted evaporation of water for adsorption heat pumps

Technologies for Seasonal Solar Energy Storage in Buildings

Simulation of a closed low-pressure honeycomb adsorber for thermal energy storage

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