Hydrogenation behavior in rectangular metal hydride tanks under effective heat management processes for green building applications

Gkanas, Evangelos I.; Panagakos, Grigorios; Statheros, Thomas; Mihalakakou, G.; Siasos, Gerasimos I.; Skodras, G.; Makridis, Sofoklis S.

doi:10.1016/j.energy.2017.10.040

Cited by 51 publications

(28 citation statements)

References 52 publications

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“…The conversion of methanol to syngas takes place over a lower temperature range of 200-325°C compared to other liquid fuels such as ethanol which is only converted at temperatures above 500 °C. The absence of C-C bonds in methanol leading to low energy chemical bonds makes the reforming of methanol popular for the development of fuel processor for hydrogen production and electricity generation using fuel cells [2,3].…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of Ni-Cu/Al2O3 for effective syngas production by methanol steam reforming

Khzouz

Wood

2018

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Section: Introductionmentioning

confidence: 99%

Catalytic performance of Ni-Cu/Al2O3 for effective syngas production by methanol steam reforming

Khzouz

Wood

2018

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“…Moreover, conservation practices and occupants' behavior are bringing energy efficiency and comfort into the discussion about cultural heritage [62]. Considerable research has been performed in the bioclimatic building sector by taking into consideration new methods in respect to materials, processes, and technology for a clean strategic development [63][64][65][66][67][68][69].…”

Section: Parameters Of Cost Reductionmentioning

confidence: 99%

Investigating Thermal Performance of Residential Buildings in Marmari Region, South Evia, Greece

et al. 2020

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In recent decades, the steady increase of energy consumption from building construction and operations cause atmospheric pollution and significant financial burden, mainly due to the high costs imposed from energy production. This study examines ways under which modern designs of a building can be applied on construction and domestication while following conventional methods of construction, compared to a building that has been constructed and domesticated under bioclimatic architecture. Particularly, two buildings were investigated in terms of the energy consumption incurred, being built on the same seaside area and period of construction and at adjacent plots of the same distance from sea for ease of comparison. The first building (A1) was constructed under the principles of bioclimatic architecture, being also facilitated with green and smart technologies. The second building (A2) was constructed under conventional construction techniques. The energy efficiency of both buildings was calculated by the “TEE KENAK” software, while specific parameters were recorded. Energy classifications of both buildings were valued and a proposed scenario and interventions unveiled the energy classification upgrading from A2 to A1. Our analysis revealed, as also found in the literature, that during thermal energy oscillating conditions, corresponding relative humidity stresses were observed, indicating that the vapor pressure handling should be taken into account towards comfort. The preliminary incremental cost evaluation and comparison of A1 and A2 energy upgrading under the criterion of simple payback period were critically discussed.

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“…The supply pressure for the experimental validation was 12 bar. The geometry of the experimental reactor is described in detail in Gkanas et al 44 The validation is shown in Figure 1. Figure 1A shows the comparison between the experimental temperature distribution (dashed line) and the temperature distribution extracted from the numerical results (bulk line), and Figure 1B presents the comparison for the hydrogenation capacity.…”

Section: Numerical Model Validationmentioning

confidence: 99%

“…39 There are three major techniques for the enhancement of the heat transfer to/from a hydride bed 40 : The metal hydride thickness can be decreased 41 ; the total system's thermal conductivity can be increased, 42 and as per Fourier's law of conduction, the introduction of a temperature difference in the system. 43,44 In the past, there has been an extensive research in the field of thermal management of metal hydride tanks, in order to enhance the reaction kinetics of the hydrogenation/dehydrogenation and to optimise the tank design.…”

Section: Introductionmentioning

confidence: 99%

“…36 On the other hand, the dissolution of the hydride bonds is an endothermic process, as large amounts of thermal energy are necessary. 43,44 In the past, there has been an extensive research in the field of thermal management of metal hydride tanks, in order to enhance the reaction kinetics of the hydrogenation/dehydrogenation and to optimise the tank design. 38 In general, the thermal management of hydride vessels can be applied either internally or externally.…”

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Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications

Gkanas

2019

Int J Energy Res

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Summary In the present study, a numerical approach regarding the thermal management of an Mm‐based AB5‐intermetallic (MmNi4.6Al0.4) for the hydrogenation process is introduced and analysed. Several heat management scenarios are studied. The numerical model was supported and validated with experimental data in terms of hydrogenation capacity and temperature distribution. The numerical analysis is based on the introduction of the energy, mass, and momentum conservation equations to numerically describe the hydrogenation reaction. The main aim of the present study is the numerical description of the heat management when 200 g of hydrogen are stored (13 kg of the hydride). The heat management cases consider the usage of cooling tubes in combination with high thermal conductivity fins. In general, various parameters affect the efficiency of the heat management. The parameters considered are the fin thickness, the fin number—which is directly connected to the metal hydride thickness convective heat transfer coefficient. A nondimensional parameter (nondimensional conductance [NDC]) specially modified to describe the role of the fins in addition to the cooling tubes is introduced to evaluate the heat management. The target of the study was to reduce the hydrogenation time of almost 13 kg of MmNi4.6Al0.4, and from the parametric study, it has been found that the more efficient conditions are fin thickness between 5 and 8 mm and the convective heat transfer coefficient of 2000 W/m2 K.

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Hydrogenation behavior in rectangular metal hydride tanks under effective heat management processes for green building applications

Cited by 51 publications

References 52 publications

Catalytic performance of Ni-Cu/Al2O3 for effective syngas production by methanol steam reforming

Catalytic performance of Ni-Cu/Al2O3 for effective syngas production by methanol steam reforming

Investigating Thermal Performance of Residential Buildings in Marmari Region, South Evia, Greece

Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications

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Hydrogenation behavior in rectangular metal hydride tanks under effective heat management processes for green building applications

Cited by 51 publications

References 52 publications

Catalytic performance of Ni-Cu/Al2O3 for effective syngas production by methanol steam reforming

Catalytic performance of Ni-Cu/Al2O3 for effective syngas production by methanol steam reforming

Investigating Thermal Performance of Residential Buildings in Marmari Region, South Evia, Greece

Study on the hydrogenation of an Mm‐based AB 5 ‐intermetallic for sustainable building applications

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Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications