Title:

The Novel Heat Accumulator for the Heating of Electric Vehicles

Authors:

Libor Gschwandtner

Abstract:

This paper deals with the impact of heating on the driving range of electric vehicles (EV-s), as the energy from a car battery is used on both driving and heating of the car. The possible solution is the novel heating device with its own energy source – low presuure heat accumulator. The use of inner heat exchanger in this accumulator makes the design of whole device very easy and with the division of a high - pressure from a low – pressure part increases its safety. With addition of some salts into water, it is possible to decrease the value of inner pressure (vapor pressure) in heat accumulator along with the conservation of good thermophysical properties of the storage medium. In conclusion the measurements on heat accumulator in real conditions are presented

Citation:

Gschwandtner Libor: The Novel Heat Aaccumulator for the Heating of Electric Vehicles, Advance in Thermal Processes and Energy Transformation, Volume 4, No.1 (2021), pp. 01-08, ISSN 2585-9102. https://doi.org/10.54570/atpet2021/04/01/0001

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Title:

Industrial-Scale Hydrogen Production Plant Modelling

Authors:

Dominik Hoppej, Miroslav Variny

Abstract:

Considering the process characteristics, hydrogen production via steam methane reforming is a vital part of oil refinery not just in terms of materials, but of energy integration as well. This work extends the mathematical model describing hydrogen production by ATE (Approach to Equilibrium) parameters implemented within the chemical reactors’ models. Equations for ATE parameter prediction, i.e. mass flow of process feed (natural gas) and reaction temperature, were formulated. Verification of the whole model as well as of its parameters was performed using process data from a real hydrogen plant. The extended mathematical model is suitable for the evaluation of the influence of increased hydrogen content in natural gas on plant´s material and energy efficiency, as renewable hydrogen injection and co-transport in natural gas pipelines in future is proposed by the European Union as a means of decreasing carbon dioxide emissions.

Citation:

Hoppej Dominik, Variny Miroslav: Industrial-Scale Hydrogen Production Plant Modelling, Advances in Thermal Processes and Energy Transformation, Volume 4, No.1 (2021), pp. 09-15, ISSN 2585-9102. https://doi.org/10.54570/atpet2021/04/01/0009

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Title:

Determination of Pressure Loss of Silencers Used in Air Conditioning

Authors:

Šimon Kubas, Andrej Kapjor, Martin Vantúch, Juraj Drga

Abstract:

When designing air conditioning systems, it is necessary to pay attention to the level of noise generated during the operation of such a system. Each of the components of the air conditioning system either absorbs or generates noise. Noise in pipes and fittings can be reduced to the required level by dimensioning the pipes. However, noise generated by the fan itself must be eliminated in another way. To eliminate fan noise, silencers are used in the duct just behind the air handling unit. For the correct design of the silencer, it is necessary to pay attention not only to its acoustic attenuation, but also to the pressure loss. If the pressure drop of the muffler is too high, noise will occur directly in the muffler. The pressure losses of the dampers are determined mainly experimentally. Based on the performed measurement, a CFD model of the selected damper was constructed, where the influence of various parameters on the value of the pressure loss of the selected damper was investigated.

Citation:

Kubas Šimon, Kapjor Andrej, Vantúch Martin, Drga Juraj: Determination of Pressure Loss of Silencers Used in Air Conditioning, Advance in Thermal Processes and Energy Transformation Volume 4, No. 1, (2021), pp. 16-19, ISSN 2585-9102. https://doi.org/10.54570/atpet2021/04/01/0016

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